refactor: 调整项目结构为单向依赖

2025-12-26 15:40:24 +08:00
parent b3463769dc
commit e5a77853b0
98 changed files with 5503 additions and 3352 deletions
--- a/backend/cmd/server/wire_gen.go
+++ b/backend/cmd/server/wire_gen.go
@@ -48,8 +48,8 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	turnstileService := service.NewTurnstileService(settingService, turnstileVerifier)
 	emailQueueService := service.ProvideEmailQueueService(emailService)
 	authService := service.NewAuthService(userRepository, configConfig, settingService, emailService, turnstileService, emailQueueService)
-	authHandler := handler.NewAuthHandler(authService)
 	userService := service.NewUserService(userRepository)
+	authHandler := handler.NewAuthHandler(authService, userService)
 	userHandler := handler.NewUserHandler(userService)
 	apiKeyRepository := repository.NewApiKeyRepository(db)
 	groupRepository := repository.NewGroupRepository(db)
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -22,12 +22,14 @@ require (
 	golang.org/x/net v0.47.0
 	golang.org/x/term v0.37.0
 	gopkg.in/yaml.v3 v3.0.1
+	gorm.io/datatypes v1.2.0
 	gorm.io/driver/postgres v1.5.4
 	gorm.io/gorm v1.25.5
 )

 require (
 	dario.cat/mergo v1.0.2 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
@@ -57,6 +59,7 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.14.0 // indirect
+	github.com/go-sql-driver/mysql v1.8.1 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/subcommands v1.2.0 // indirect
@@ -64,8 +67,8 @@ require (
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/icholy/digest v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
-	github.com/jackc/pgx/v5 v5.5.4 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9 // indirect
+	github.com/jackc/pgx/v5 v5.5.5 // indirect
 	github.com/jackc/puddle/v2 v2.2.1 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
@@ -132,4 +135,5 @@ require (
 	google.golang.org/grpc v1.75.1 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
+	gorm.io/driver/mysql v1.5.2 // indirect
 )
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -1,5 +1,7 @@
 dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
 dario.cat/mergo v1.0.2/go.mod h1:E/hbnu0NxMFBjpMIE34DRGLWqDy0g5FuKDhCb31ngxA=
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6 h1:He8afgbRMd7mFxO99hRNu+6tazq8nFF9lIwo9JFroBk=
 github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6/go.mod h1:8o94RPi1/7XTJvwPpRSzSUedZrtlirdB3r9Z20bi2f8=
 github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
@@ -77,10 +79,17 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
 github.com/go-playground/validator/v10 v10.14.0 h1:vgvQWe3XCz3gIeFDm/HnTIbj6UGmg/+t63MyGU2n5js=
 github.com/go-playground/validator/v10 v10.14.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU=
+github.com/go-sql-driver/mysql v1.7.0/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
+github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
+github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/golang-jwt/jwt/v5 v5.2.0 h1:d/ix8ftRUorsN+5eMIlF4T6J8CAt9rch3My2winC1Jw=
 github.com/golang-jwt/jwt/v5 v5.2.0/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 h1:au07oEsX2xN0ktxqI+Sida1w446QrXBRJ0nee3SNZlA=
+github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
+github.com/golang-sql/sqlexp v0.1.0 h1:ZCD6MBpcuOVfGVqsEmY5/4FtYiKz6tSyUv9LPEDei6A=
+github.com/golang-sql/sqlexp v0.1.0/go.mod h1:J4ad9Vo8ZCWQ2GMrC4UCQy1JpCbwU9m3EOqtpKwwwHI=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
@@ -104,10 +113,10 @@ github.com/imroc/req/v3 v3.56.0 h1:t6YdqqerYBXhZ9+VjqsQs5wlKxdUNEvsgBhxWc1AEEo=
 github.com/imroc/req/v3 v3.56.0/go.mod h1:cUZSooE8hhzFNOrAbdxuemXDQxFXLQTnu3066jr7ZGk=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
-github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a h1:bbPeKD0xmW/Y25WS6cokEszi5g+S0QxI/d45PkRi7Nk=
-github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
-github.com/jackc/pgx/v5 v5.5.4 h1:Xp2aQS8uXButQdnCMWNmvx6UysWQQC+u1EoizjguY+8=
-github.com/jackc/pgx/v5 v5.5.4/go.mod h1:ez9gk+OAat140fv9ErkZDYFWmXLfV+++K0uAOiwgm1A=
+github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9 h1:L0QtFUgDarD7Fpv9jeVMgy/+Ec0mtnmYuImjTz6dtDA=
+github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.5.5 h1:amBjrZVmksIdNjxGW/IiIMzxMKZFelXbUoPNb+8sjQw=
+github.com/jackc/pgx/v5 v5.5.5/go.mod h1:ez9gk+OAat140fv9ErkZDYFWmXLfV+++K0uAOiwgm1A=
 github.com/jackc/puddle/v2 v2.2.1 h1:RhxXJtFG022u4ibrCSMSiu5aOq1i77R3OHKNJj77OAk=
 github.com/jackc/puddle/v2 v2.2.1/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
@@ -135,8 +144,12 @@ github.com/magiconair/properties v1.8.10 h1:s31yESBquKXCV9a/ScB3ESkOjUYYv+X0rg8S
 github.com/magiconair/properties v1.8.10/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
 github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
 github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-sqlite3 v1.14.15 h1:vfoHhTN1af61xCRSWzFIWzx2YskyMTwHLrExkBOjvxI=
+github.com/mattn/go-sqlite3 v1.14.15/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mdelapenya/tlscert v0.2.0 h1:7H81W6Z/4weDvZBNOfQte5GpIMo0lGYEeWbkGp5LJHI=
 github.com/mdelapenya/tlscert v0.2.0/go.mod h1:O4njj3ELLnJjGdkN7M/vIVCpZ+Cf0L6muqOG4tLSl8o=
+github.com/microsoft/go-mssqldb v0.17.0 h1:Fto83dMZPnYv1Zwx5vHHxpNraeEaUlQ/hhHLgZiaenE=
+github.com/microsoft/go-mssqldb v0.17.0/go.mod h1:OkoNGhGEs8EZqchVTtochlXruEhEOaO4S0d2sB5aeGQ=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0=
@@ -319,8 +332,17 @@ gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gorm.io/datatypes v1.2.0 h1:5YT+eokWdIxhJgWHdrb2zYUimyk0+TaFth+7a0ybzco=
+gorm.io/datatypes v1.2.0/go.mod h1:o1dh0ZvjIjhH/bngTpypG6lVRJ5chTBxE09FH/71k04=
+gorm.io/driver/mysql v1.5.2 h1:QC2HRskSE75wBuOxe0+iCkyJZ+RqpudsQtqkp+IMuXs=
+gorm.io/driver/mysql v1.5.2/go.mod h1:pQLhh1Ut/WUAySdTHwBpBv6+JKcj+ua4ZFx1QQTBzb8=
 gorm.io/driver/postgres v1.5.4 h1:Iyrp9Meh3GmbSuyIAGyjkN+n9K+GHX9b9MqsTL4EJCo=
 gorm.io/driver/postgres v1.5.4/go.mod h1:Bgo89+h0CRcdA33Y6frlaHHVuTdOf87pmyzwW9C/BH0=
+gorm.io/driver/sqlite v1.4.3 h1:HBBcZSDnWi5BW3B3rwvVTc510KGkBkexlOg0QrmLUuU=
+gorm.io/driver/sqlite v1.4.3/go.mod h1:0Aq3iPO+v9ZKbcdiz8gLWRw5VOPcBOPUQJFLq5e2ecI=
+gorm.io/driver/sqlserver v1.4.1 h1:t4r4r6Jam5E6ejqP7N82qAJIJAht27EGT41HyPfXRw0=
+gorm.io/driver/sqlserver v1.4.1/go.mod h1:DJ4P+MeZbc5rvY58PnmN1Lnyvb5gw5NPzGshHDnJLig=
+gorm.io/gorm v1.25.2-0.20230530020048-26663ab9bf55/go.mod h1:L4uxeKpfBml98NYqVqwAdmV1a2nBtAec/cf3fpucW/k=
 gorm.io/gorm v1.25.5 h1:zR9lOiiYf09VNh5Q1gphfyia1JpiClIWG9hQaxB/mls=
 gorm.io/gorm v1.25.5/go.mod h1:hbnx/Oo0ChWMn1BIhpy1oYozzpM15i4YPuHDmfYtwg8=
 gotest.tools/v3 v3.5.2 h1:7koQfIKdy+I8UTetycgUqXWSDwpgv193Ka+qRsmBY8Q=
--- a/backend/internal/handler/admin/account_handler.go
+++ b/backend/internal/handler/admin/account_handler.go
@@ -3,7 +3,7 @@ package admin
 import (
 	"strconv"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
@@ -102,7 +102,7 @@ type BulkUpdateAccountsRequest struct {

 // AccountWithConcurrency extends Account with real-time concurrency info
 type AccountWithConcurrency struct {
-	*model.Account
+	*dto.Account
 	CurrentConcurrency int `json:"current_concurrency"`
 }

@@ -137,7 +137,7 @@ func (h *AccountHandler) List(c *gin.Context) {
 	result := make([]AccountWithConcurrency, len(accounts))
 	for i := range accounts {
 		result[i] = AccountWithConcurrency{
-			Account:            &accounts[i],
+			Account:            dto.AccountFromService(&accounts[i]),
 			CurrentConcurrency: concurrencyCounts[accounts[i].ID],
 		}
 	}
@@ -160,7 +160,7 @@ func (h *AccountHandler) GetByID(c *gin.Context) {
 		return
 	}

-	response.Success(c, account)
+	response.Success(c, dto.AccountFromService(account))
 }

 // Create handles creating a new account
@@ -188,7 +188,7 @@ func (h *AccountHandler) Create(c *gin.Context) {
 		return
 	}

-	response.Success(c, account)
+	response.Success(c, dto.AccountFromService(account))
 }

 // Update handles updating an account
@@ -222,7 +222,7 @@ func (h *AccountHandler) Update(c *gin.Context) {
 		return
 	}

-	response.Success(c, account)
+	response.Success(c, dto.AccountFromService(account))
 }

 // Delete handles deleting an account
@@ -425,7 +425,7 @@ func (h *AccountHandler) ClearError(c *gin.Context) {
 		return
 	}

-	response.Success(c, account)
+	response.Success(c, dto.AccountFromService(account))
 }

 // BatchCreate handles batch creating accounts
@@ -801,7 +801,7 @@ func (h *AccountHandler) SetSchedulable(c *gin.Context) {
 		return
 	}

-	response.Success(c, account)
+	response.Success(c, dto.AccountFromService(account))
 }

 // GetAvailableModels handles getting available models for an account
--- a/backend/internal/handler/admin/dashboard_handler.go
+++ b/backend/internal/handler/admin/dashboard_handler.go
@@ -1,11 +1,12 @@
 package admin

 import (
+	"strconv"
+	"time"
+
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/Wei-Shaw/sub2api/internal/service"
-	"strconv"
-	"time"

 	"github.com/gin-gonic/gin"
 )
--- a/backend/internal/handler/admin/group_handler.go
+++ b/backend/internal/handler/admin/group_handler.go
@@ -3,7 +3,7 @@ package admin
 import (
 	"strconv"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/service"

@@ -69,7 +69,11 @@ func (h *GroupHandler) List(c *gin.Context) {
 		return
 	}

-	response.Paginated(c, groups, total, page, pageSize)
+	outGroups := make([]dto.Group, 0, len(groups))
+	for i := range groups {
+		outGroups = append(outGroups, *dto.GroupFromService(&groups[i]))
+	}
+	response.Paginated(c, outGroups, total, page, pageSize)
 }

 // GetAll handles getting all active groups without pagination
@@ -77,7 +81,7 @@ func (h *GroupHandler) List(c *gin.Context) {
 func (h *GroupHandler) GetAll(c *gin.Context) {
 	platform := c.Query("platform")

-	var groups []model.Group
+	var groups []service.Group
 	var err error

 	if platform != "" {
@@ -91,7 +95,11 @@ func (h *GroupHandler) GetAll(c *gin.Context) {
 		return
 	}

-	response.Success(c, groups)
+	outGroups := make([]dto.Group, 0, len(groups))
+	for i := range groups {
+		outGroups = append(outGroups, *dto.GroupFromService(&groups[i]))
+	}
+	response.Success(c, outGroups)
 }

 // GetByID handles getting a group by ID
@@ -109,7 +117,7 @@ func (h *GroupHandler) GetByID(c *gin.Context) {
 		return
 	}

-	response.Success(c, group)
+	response.Success(c, dto.GroupFromService(group))
 }

 // Create handles creating a new group
@@ -137,7 +145,7 @@ func (h *GroupHandler) Create(c *gin.Context) {
 		return
 	}

-	response.Success(c, group)
+	response.Success(c, dto.GroupFromService(group))
 }

 // Update handles updating a group
@@ -172,7 +180,7 @@ func (h *GroupHandler) Update(c *gin.Context) {
 		return
 	}

-	response.Success(c, group)
+	response.Success(c, dto.GroupFromService(group))
 }

 // Delete handles deleting a group
@@ -229,5 +237,9 @@ func (h *GroupHandler) GetGroupAPIKeys(c *gin.Context) {
 		return
 	}

-	response.Paginated(c, keys, total, page, pageSize)
+	outKeys := make([]dto.ApiKey, 0, len(keys))
+	for i := range keys {
+		outKeys = append(outKeys, *dto.ApiKeyFromService(&keys[i]))
+	}
+	response.Paginated(c, outKeys, total, page, pageSize)
 }
--- a/backend/internal/handler/admin/setting_handler.go
+++ b/backend/internal/handler/admin/setting_handler.go
@@ -1,7 +1,7 @@
 package admin

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/service"

@@ -31,7 +31,28 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 		return
 	}

-	response.Success(c, settings)
+	response.Success(c, dto.SystemSettings{
+		RegistrationEnabled: settings.RegistrationEnabled,
+		EmailVerifyEnabled:  settings.EmailVerifyEnabled,
+		SmtpHost:            settings.SmtpHost,
+		SmtpPort:            settings.SmtpPort,
+		SmtpUsername:        settings.SmtpUsername,
+		SmtpPassword:        settings.SmtpPassword,
+		SmtpFrom:            settings.SmtpFrom,
+		SmtpFromName:        settings.SmtpFromName,
+		SmtpUseTLS:          settings.SmtpUseTLS,
+		TurnstileEnabled:    settings.TurnstileEnabled,
+		TurnstileSiteKey:    settings.TurnstileSiteKey,
+		TurnstileSecretKey:  settings.TurnstileSecretKey,
+		SiteName:            settings.SiteName,
+		SiteLogo:            settings.SiteLogo,
+		SiteSubtitle:        settings.SiteSubtitle,
+		ApiBaseUrl:          settings.ApiBaseUrl,
+		ContactInfo:         settings.ContactInfo,
+		DocUrl:              settings.DocUrl,
+		DefaultConcurrency:  settings.DefaultConcurrency,
+		DefaultBalance:      settings.DefaultBalance,
+	})
 }

 // UpdateSettingsRequest 更新设置请求
@@ -87,7 +108,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		req.SmtpPort = 587
 	}

-	settings := &model.SystemSettings{
+	settings := &service.SystemSettings{
 		RegistrationEnabled: req.RegistrationEnabled,
 		EmailVerifyEnabled:  req.EmailVerifyEnabled,
 		SmtpHost:            req.SmtpHost,
@@ -122,7 +143,28 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		return
 	}

-	response.Success(c, updatedSettings)
+	response.Success(c, dto.SystemSettings{
+		RegistrationEnabled: updatedSettings.RegistrationEnabled,
+		EmailVerifyEnabled:  updatedSettings.EmailVerifyEnabled,
+		SmtpHost:            updatedSettings.SmtpHost,
+		SmtpPort:            updatedSettings.SmtpPort,
+		SmtpUsername:        updatedSettings.SmtpUsername,
+		SmtpPassword:        updatedSettings.SmtpPassword,
+		SmtpFrom:            updatedSettings.SmtpFrom,
+		SmtpFromName:        updatedSettings.SmtpFromName,
+		SmtpUseTLS:          updatedSettings.SmtpUseTLS,
+		TurnstileEnabled:    updatedSettings.TurnstileEnabled,
+		TurnstileSiteKey:    updatedSettings.TurnstileSiteKey,
+		TurnstileSecretKey:  updatedSettings.TurnstileSecretKey,
+		SiteName:            updatedSettings.SiteName,
+		SiteLogo:            updatedSettings.SiteLogo,
+		SiteSubtitle:        updatedSettings.SiteSubtitle,
+		ApiBaseUrl:          updatedSettings.ApiBaseUrl,
+		ContactInfo:         updatedSettings.ContactInfo,
+		DocUrl:              updatedSettings.DocUrl,
+		DefaultConcurrency:  updatedSettings.DefaultConcurrency,
+		DefaultBalance:      updatedSettings.DefaultBalance,
+	})
 }

 // TestSmtpRequest 测试SMTP连接请求
--- a/backend/internal/handler/admin/subscription_handler.go
+++ b/backend/internal/handler/admin/subscription_handler.go
@@ -3,9 +3,10 @@ package admin
 import (
 	"strconv"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -82,7 +83,11 @@ func (h *SubscriptionHandler) List(c *gin.Context) {
 		return
 	}

-	response.PaginatedWithResult(c, subscriptions, toResponsePagination(pagination))
+	out := make([]dto.UserSubscription, 0, len(subscriptions))
+	for i := range subscriptions {
+		out = append(out, *dto.UserSubscriptionFromService(&subscriptions[i]))
+	}
+	response.PaginatedWithResult(c, out, toResponsePagination(pagination))
 }

 // GetByID handles getting a subscription by ID
@@ -100,7 +105,7 @@ func (h *SubscriptionHandler) GetByID(c *gin.Context) {
 		return
 	}

-	response.Success(c, subscription)
+	response.Success(c, dto.UserSubscriptionFromService(subscription))
 }

 // GetProgress handles getting subscription usage progress
@@ -145,7 +150,7 @@ func (h *SubscriptionHandler) Assign(c *gin.Context) {
 		return
 	}

-	response.Success(c, subscription)
+	response.Success(c, dto.UserSubscriptionFromService(subscription))
 }

 // BulkAssign handles bulk assigning subscriptions to multiple users
@@ -196,7 +201,7 @@ func (h *SubscriptionHandler) Extend(c *gin.Context) {
 		return
 	}

-	response.Success(c, subscription)
+	response.Success(c, dto.UserSubscriptionFromService(subscription))
 }

 // Revoke handles revoking a subscription
@@ -234,7 +239,11 @@ func (h *SubscriptionHandler) ListByGroup(c *gin.Context) {
 		return
 	}

-	response.PaginatedWithResult(c, subscriptions, toResponsePagination(pagination))
+	out := make([]dto.UserSubscription, 0, len(subscriptions))
+	for i := range subscriptions {
+		out = append(out, *dto.UserSubscriptionFromService(&subscriptions[i]))
+	}
+	response.PaginatedWithResult(c, out, toResponsePagination(pagination))
 }

 // ListByUser handles listing subscriptions for a specific user
@@ -252,15 +261,18 @@ func (h *SubscriptionHandler) ListByUser(c *gin.Context) {
 		return
 	}

-	response.Success(c, subscriptions)
+	out := make([]dto.UserSubscription, 0, len(subscriptions))
+	for i := range subscriptions {
+		out = append(out, *dto.UserSubscriptionFromService(&subscriptions[i]))
+	}
+	response.Success(c, out)
 }

 // Helper function to get admin ID from context
 func getAdminIDFromContext(c *gin.Context) int64 {
-	if user, exists := c.Get("user"); exists {
-		if u, ok := user.(*model.User); ok && u != nil {
-			return u.ID
-		}
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		return 0
 	}
-	return 0
+	return subject.UserID
 }
--- a/backend/internal/handler/api_key_handler.go
+++ b/backend/internal/handler/api_key_handler.go
@@ -3,9 +3,10 @@ package handler
 import (
 	"strconv"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -40,42 +41,34 @@ type UpdateAPIKeyRequest struct {
 // List handles listing user's API keys with pagination
 // GET /api/v1/api-keys
 func (h *APIKeyHandler) List(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

 	page, pageSize := response.ParsePagination(c)
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}

-	keys, result, err := h.apiKeyService.List(c.Request.Context(), user.ID, params)
+	keys, result, err := h.apiKeyService.List(c.Request.Context(), subject.UserID, params)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Paginated(c, keys, result.Total, page, pageSize)
+	out := make([]dto.ApiKey, 0, len(keys))
+	for i := range keys {
+		out = append(out, *dto.ApiKeyFromService(&keys[i]))
+	}
+	response.Paginated(c, out, result.Total, page, pageSize)
 }

 // GetByID handles getting a single API key
 // GET /api/v1/api-keys/:id
 func (h *APIKeyHandler) GetByID(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -92,26 +85,20 @@ func (h *APIKeyHandler) GetByID(c *gin.Context) {
 	}

 	// 验证所有权
-	if key.UserID != user.ID {
+	if key.UserID != subject.UserID {
 		response.Forbidden(c, "Not authorized to access this key")
 		return
 	}

-	response.Success(c, key)
+	response.Success(c, dto.ApiKeyFromService(key))
 }

 // Create handles creating a new API key
 // POST /api/v1/api-keys
 func (h *APIKeyHandler) Create(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -126,27 +113,21 @@ func (h *APIKeyHandler) Create(c *gin.Context) {
 		GroupID:   req.GroupID,
 		CustomKey: req.CustomKey,
 	}
-	key, err := h.apiKeyService.Create(c.Request.Context(), user.ID, svcReq)
+	key, err := h.apiKeyService.Create(c.Request.Context(), subject.UserID, svcReq)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, key)
+	response.Success(c, dto.ApiKeyFromService(key))
 }

 // Update handles updating an API key
 // PUT /api/v1/api-keys/:id
 func (h *APIKeyHandler) Update(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -171,27 +152,21 @@ func (h *APIKeyHandler) Update(c *gin.Context) {
 		svcReq.Status = &req.Status
 	}

-	key, err := h.apiKeyService.Update(c.Request.Context(), keyID, user.ID, svcReq)
+	key, err := h.apiKeyService.Update(c.Request.Context(), keyID, subject.UserID, svcReq)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, key)
+	response.Success(c, dto.ApiKeyFromService(key))
 }

 // Delete handles deleting an API key
 // DELETE /api/v1/api-keys/:id
 func (h *APIKeyHandler) Delete(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -201,7 +176,7 @@ func (h *APIKeyHandler) Delete(c *gin.Context) {
 		return
 	}

-	err = h.apiKeyService.Delete(c.Request.Context(), keyID, user.ID)
+	err = h.apiKeyService.Delete(c.Request.Context(), keyID, subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -213,23 +188,21 @@ func (h *APIKeyHandler) Delete(c *gin.Context) {
 // GetAvailableGroups 获取用户可以绑定的分组列表
 // GET /api/v1/groups/available
 func (h *APIKeyHandler) GetAvailableGroups(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not authenticated")
 		return
 	}

-	user, ok := userValue.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user context")
-		return
-	}
-
-	groups, err := h.apiKeyService.GetAvailableGroups(c.Request.Context(), user.ID)
+	groups, err := h.apiKeyService.GetAvailableGroups(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, groups)
+	out := make([]dto.Group, 0, len(groups))
+	for i := range groups {
+		out = append(out, *dto.GroupFromService(&groups[i]))
+	}
+	response.Success(c, out)
 }
--- a/backend/internal/handler/auth_handler.go
+++ b/backend/internal/handler/auth_handler.go
@@ -1,8 +1,9 @@
 package handler

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -11,12 +12,14 @@ import (
 // AuthHandler handles authentication-related requests
 type AuthHandler struct {
 	authService *service.AuthService
+	userService *service.UserService
 }

 // NewAuthHandler creates a new AuthHandler
-func NewAuthHandler(authService *service.AuthService) *AuthHandler {
+func NewAuthHandler(authService *service.AuthService, userService *service.UserService) *AuthHandler {
 	return &AuthHandler{
 		authService: authService,
+		userService: userService,
 	}
 }

@@ -49,9 +52,9 @@ type LoginRequest struct {

 // AuthResponse 认证响应格式（匹配前端期望）
 type AuthResponse struct {
-	AccessToken string      `json:"access_token"`
-	TokenType   string      `json:"token_type"`
-	User        *model.User `json:"user"`
+	AccessToken string    `json:"access_token"`
+	TokenType   string    `json:"token_type"`
+	User        *dto.User `json:"user"`
 }

 // Register handles user registration
@@ -80,7 +83,7 @@ func (h *AuthHandler) Register(c *gin.Context) {
 	response.Success(c, AuthResponse{
 		AccessToken: token,
 		TokenType:   "Bearer",
-		User:        user,
+		User:        dto.UserFromService(user),
 	})
 }

@@ -135,24 +138,24 @@ func (h *AuthHandler) Login(c *gin.Context) {
 	response.Success(c, AuthResponse{
 		AccessToken: token,
 		TokenType:   "Bearer",
-		User:        user,
+		User:        dto.UserFromService(user),
 	})
 }

 // GetCurrentUser handles getting current authenticated user
 // GET /api/v1/auth/me
 func (h *AuthHandler) GetCurrentUser(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not authenticated")
 		return
 	}

-	user, ok := userValue.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user context")
+	user, err := h.userService.GetByID(c.Request.Context(), subject.UserID)
+	if err != nil {
+		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, user)
+	response.Success(c, dto.UserFromService(user))
 }
--- a/backend/internal/handler/dto/mappers.go
+++ b/backend/internal/handler/dto/mappers.go
@@ -0,0 +1,294 @@
+package dto
+
+import "github.com/Wei-Shaw/sub2api/internal/service"
+
+func UserFromServiceShallow(u *service.User) *User {
+	if u == nil {
+		return nil
+	}
+	return &User{
+		ID:            u.ID,
+		Email:         u.Email,
+		Username:      u.Username,
+		Wechat:        u.Wechat,
+		Notes:         u.Notes,
+		Role:          u.Role,
+		Balance:       u.Balance,
+		Concurrency:   u.Concurrency,
+		Status:        u.Status,
+		AllowedGroups: u.AllowedGroups,
+		CreatedAt:     u.CreatedAt,
+		UpdatedAt:     u.UpdatedAt,
+	}
+}
+
+func UserFromService(u *service.User) *User {
+	if u == nil {
+		return nil
+	}
+	out := UserFromServiceShallow(u)
+	if len(u.ApiKeys) > 0 {
+		out.ApiKeys = make([]ApiKey, 0, len(u.ApiKeys))
+		for i := range u.ApiKeys {
+			k := u.ApiKeys[i]
+			out.ApiKeys = append(out.ApiKeys, *ApiKeyFromService(&k))
+		}
+	}
+	if len(u.Subscriptions) > 0 {
+		out.Subscriptions = make([]UserSubscription, 0, len(u.Subscriptions))
+		for i := range u.Subscriptions {
+			s := u.Subscriptions[i]
+			out.Subscriptions = append(out.Subscriptions, *UserSubscriptionFromService(&s))
+		}
+	}
+	return out
+}
+
+func ApiKeyFromService(k *service.ApiKey) *ApiKey {
+	if k == nil {
+		return nil
+	}
+	return &ApiKey{
+		ID:        k.ID,
+		UserID:    k.UserID,
+		Key:       k.Key,
+		Name:      k.Name,
+		GroupID:   k.GroupID,
+		Status:    k.Status,
+		CreatedAt: k.CreatedAt,
+		UpdatedAt: k.UpdatedAt,
+		User:      UserFromServiceShallow(k.User),
+		Group:     GroupFromServiceShallow(k.Group),
+	}
+}
+
+func GroupFromServiceShallow(g *service.Group) *Group {
+	if g == nil {
+		return nil
+	}
+	return &Group{
+		ID:               g.ID,
+		Name:             g.Name,
+		Description:      g.Description,
+		Platform:         g.Platform,
+		RateMultiplier:   g.RateMultiplier,
+		IsExclusive:      g.IsExclusive,
+		Status:           g.Status,
+		SubscriptionType: g.SubscriptionType,
+		DailyLimitUSD:    g.DailyLimitUSD,
+		WeeklyLimitUSD:   g.WeeklyLimitUSD,
+		MonthlyLimitUSD:  g.MonthlyLimitUSD,
+		CreatedAt:        g.CreatedAt,
+		UpdatedAt:        g.UpdatedAt,
+		AccountCount:     g.AccountCount,
+	}
+}
+
+func GroupFromService(g *service.Group) *Group {
+	if g == nil {
+		return nil
+	}
+	out := GroupFromServiceShallow(g)
+	if len(g.AccountGroups) > 0 {
+		out.AccountGroups = make([]AccountGroup, 0, len(g.AccountGroups))
+		for i := range g.AccountGroups {
+			ag := g.AccountGroups[i]
+			out.AccountGroups = append(out.AccountGroups, *AccountGroupFromService(&ag))
+		}
+	}
+	return out
+}
+
+func AccountFromServiceShallow(a *service.Account) *Account {
+	if a == nil {
+		return nil
+	}
+	return &Account{
+		ID:                  a.ID,
+		Name:                a.Name,
+		Platform:            a.Platform,
+		Type:                a.Type,
+		Credentials:         a.Credentials,
+		Extra:               a.Extra,
+		ProxyID:             a.ProxyID,
+		Concurrency:         a.Concurrency,
+		Priority:            a.Priority,
+		Status:              a.Status,
+		ErrorMessage:        a.ErrorMessage,
+		LastUsedAt:          a.LastUsedAt,
+		CreatedAt:           a.CreatedAt,
+		UpdatedAt:           a.UpdatedAt,
+		Schedulable:         a.Schedulable,
+		RateLimitedAt:       a.RateLimitedAt,
+		RateLimitResetAt:    a.RateLimitResetAt,
+		OverloadUntil:       a.OverloadUntil,
+		SessionWindowStart:  a.SessionWindowStart,
+		SessionWindowEnd:    a.SessionWindowEnd,
+		SessionWindowStatus: a.SessionWindowStatus,
+		GroupIDs:            a.GroupIDs,
+	}
+}
+
+func AccountFromService(a *service.Account) *Account {
+	if a == nil {
+		return nil
+	}
+	out := AccountFromServiceShallow(a)
+	out.Proxy = ProxyFromService(a.Proxy)
+	if len(a.AccountGroups) > 0 {
+		out.AccountGroups = make([]AccountGroup, 0, len(a.AccountGroups))
+		for i := range a.AccountGroups {
+			ag := a.AccountGroups[i]
+			out.AccountGroups = append(out.AccountGroups, *AccountGroupFromService(&ag))
+		}
+	}
+	if len(a.Groups) > 0 {
+		out.Groups = make([]*Group, 0, len(a.Groups))
+		for _, g := range a.Groups {
+			out.Groups = append(out.Groups, GroupFromServiceShallow(g))
+		}
+	}
+	return out
+}
+
+func AccountGroupFromService(ag *service.AccountGroup) *AccountGroup {
+	if ag == nil {
+		return nil
+	}
+	return &AccountGroup{
+		AccountID: ag.AccountID,
+		GroupID:   ag.GroupID,
+		Priority:  ag.Priority,
+		CreatedAt: ag.CreatedAt,
+		Account:   AccountFromServiceShallow(ag.Account),
+		Group:     GroupFromServiceShallow(ag.Group),
+	}
+}
+
+func ProxyFromService(p *service.Proxy) *Proxy {
+	if p == nil {
+		return nil
+	}
+	return &Proxy{
+		ID:        p.ID,
+		Name:      p.Name,
+		Protocol:  p.Protocol,
+		Host:      p.Host,
+		Port:      p.Port,
+		Username:  p.Username,
+		Password:  p.Password,
+		Status:    p.Status,
+		CreatedAt: p.CreatedAt,
+		UpdatedAt: p.UpdatedAt,
+	}
+}
+
+func ProxyWithAccountCountFromService(p *service.ProxyWithAccountCount) *ProxyWithAccountCount {
+	if p == nil {
+		return nil
+	}
+	return &ProxyWithAccountCount{
+		Proxy:        *ProxyFromService(&p.Proxy),
+		AccountCount: p.AccountCount,
+	}
+}
+
+func RedeemCodeFromService(rc *service.RedeemCode) *RedeemCode {
+	if rc == nil {
+		return nil
+	}
+	return &RedeemCode{
+		ID:           rc.ID,
+		Code:         rc.Code,
+		Type:         rc.Type,
+		Value:        rc.Value,
+		Status:       rc.Status,
+		UsedBy:       rc.UsedBy,
+		UsedAt:       rc.UsedAt,
+		Notes:        rc.Notes,
+		CreatedAt:    rc.CreatedAt,
+		GroupID:      rc.GroupID,
+		ValidityDays: rc.ValidityDays,
+		User:         UserFromServiceShallow(rc.User),
+		Group:        GroupFromServiceShallow(rc.Group),
+	}
+}
+
+func UsageLogFromService(l *service.UsageLog) *UsageLog {
+	if l == nil {
+		return nil
+	}
+	return &UsageLog{
+		ID:                    l.ID,
+		UserID:                l.UserID,
+		ApiKeyID:              l.ApiKeyID,
+		AccountID:             l.AccountID,
+		RequestID:             l.RequestID,
+		Model:                 l.Model,
+		GroupID:               l.GroupID,
+		SubscriptionID:        l.SubscriptionID,
+		InputTokens:           l.InputTokens,
+		OutputTokens:          l.OutputTokens,
+		CacheCreationTokens:   l.CacheCreationTokens,
+		CacheReadTokens:       l.CacheReadTokens,
+		CacheCreation5mTokens: l.CacheCreation5mTokens,
+		CacheCreation1hTokens: l.CacheCreation1hTokens,
+		InputCost:             l.InputCost,
+		OutputCost:            l.OutputCost,
+		CacheCreationCost:     l.CacheCreationCost,
+		CacheReadCost:         l.CacheReadCost,
+		TotalCost:             l.TotalCost,
+		ActualCost:            l.ActualCost,
+		RateMultiplier:        l.RateMultiplier,
+		BillingType:           l.BillingType,
+		Stream:                l.Stream,
+		DurationMs:            l.DurationMs,
+		FirstTokenMs:          l.FirstTokenMs,
+		CreatedAt:             l.CreatedAt,
+		User:                  UserFromServiceShallow(l.User),
+		ApiKey:                ApiKeyFromService(l.ApiKey),
+		Account:               AccountFromService(l.Account),
+		Group:                 GroupFromServiceShallow(l.Group),
+		Subscription:          UserSubscriptionFromService(l.Subscription),
+	}
+}
+
+func SettingFromService(s *service.Setting) *Setting {
+	if s == nil {
+		return nil
+	}
+	return &Setting{
+		ID:        s.ID,
+		Key:       s.Key,
+		Value:     s.Value,
+		UpdatedAt: s.UpdatedAt,
+	}
+}
+
+func UserSubscriptionFromService(sub *service.UserSubscription) *UserSubscription {
+	if sub == nil {
+		return nil
+	}
+	return &UserSubscription{
+		ID:                 sub.ID,
+		UserID:             sub.UserID,
+		GroupID:            sub.GroupID,
+		StartsAt:           sub.StartsAt,
+		ExpiresAt:          sub.ExpiresAt,
+		Status:             sub.Status,
+		DailyWindowStart:   sub.DailyWindowStart,
+		WeeklyWindowStart:  sub.WeeklyWindowStart,
+		MonthlyWindowStart: sub.MonthlyWindowStart,
+		DailyUsageUSD:      sub.DailyUsageUSD,
+		WeeklyUsageUSD:     sub.WeeklyUsageUSD,
+		MonthlyUsageUSD:    sub.MonthlyUsageUSD,
+		AssignedBy:         sub.AssignedBy,
+		AssignedAt:         sub.AssignedAt,
+		Notes:              sub.Notes,
+		CreatedAt:          sub.CreatedAt,
+		UpdatedAt:          sub.UpdatedAt,
+		User:               UserFromServiceShallow(sub.User),
+		Group:              GroupFromServiceShallow(sub.Group),
+		AssignedByUser:     UserFromServiceShallow(sub.AssignedByUser),
+	}
+}
--- a/backend/internal/handler/dto/settings.go
+++ b/backend/internal/handler/dto/settings.go
@@ -0,0 +1,43 @@
+package dto
+
+// SystemSettings represents the admin settings API response payload.
+type SystemSettings struct {
+	RegistrationEnabled bool `json:"registration_enabled"`
+	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
+
+	SmtpHost     string `json:"smtp_host"`
+	SmtpPort     int    `json:"smtp_port"`
+	SmtpUsername string `json:"smtp_username"`
+	SmtpPassword string `json:"smtp_password,omitempty"`
+	SmtpFrom     string `json:"smtp_from_email"`
+	SmtpFromName string `json:"smtp_from_name"`
+	SmtpUseTLS   bool   `json:"smtp_use_tls"`
+
+	TurnstileEnabled   bool   `json:"turnstile_enabled"`
+	TurnstileSiteKey   string `json:"turnstile_site_key"`
+	TurnstileSecretKey string `json:"turnstile_secret_key,omitempty"`
+
+	SiteName     string `json:"site_name"`
+	SiteLogo     string `json:"site_logo"`
+	SiteSubtitle string `json:"site_subtitle"`
+	ApiBaseUrl   string `json:"api_base_url"`
+	ContactInfo  string `json:"contact_info"`
+	DocUrl       string `json:"doc_url"`
+
+	DefaultConcurrency int     `json:"default_concurrency"`
+	DefaultBalance     float64 `json:"default_balance"`
+}
+
+type PublicSettings struct {
+	RegistrationEnabled bool   `json:"registration_enabled"`
+	EmailVerifyEnabled  bool   `json:"email_verify_enabled"`
+	TurnstileEnabled    bool   `json:"turnstile_enabled"`
+	TurnstileSiteKey    string `json:"turnstile_site_key"`
+	SiteName            string `json:"site_name"`
+	SiteLogo            string `json:"site_logo"`
+	SiteSubtitle        string `json:"site_subtitle"`
+	ApiBaseUrl          string `json:"api_base_url"`
+	ContactInfo         string `json:"contact_info"`
+	DocUrl              string `json:"doc_url"`
+	Version             string `json:"version"`
+}
--- a/backend/internal/handler/dto/types.go
+++ b/backend/internal/handler/dto/types.go
@@ -0,0 +1,212 @@
+package dto
+
+import "time"
+
+type User struct {
+	ID            int64     `json:"id"`
+	Email         string    `json:"email"`
+	Username      string    `json:"username"`
+	Wechat        string    `json:"wechat"`
+	Notes         string    `json:"notes"`
+	Role          string    `json:"role"`
+	Balance       float64   `json:"balance"`
+	Concurrency   int       `json:"concurrency"`
+	Status        string    `json:"status"`
+	AllowedGroups []int64   `json:"allowed_groups"`
+	CreatedAt     time.Time `json:"created_at"`
+	UpdatedAt     time.Time `json:"updated_at"`
+
+	ApiKeys       []ApiKey           `json:"api_keys,omitempty"`
+	Subscriptions []UserSubscription `json:"subscriptions,omitempty"`
+}
+
+type ApiKey struct {
+	ID        int64     `json:"id"`
+	UserID    int64     `json:"user_id"`
+	Key       string    `json:"key"`
+	Name      string    `json:"name"`
+	GroupID   *int64    `json:"group_id"`
+	Status    string    `json:"status"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+
+	User  *User  `json:"user,omitempty"`
+	Group *Group `json:"group,omitempty"`
+}
+
+type Group struct {
+	ID             int64   `json:"id"`
+	Name           string  `json:"name"`
+	Description    string  `json:"description"`
+	Platform       string  `json:"platform"`
+	RateMultiplier float64 `json:"rate_multiplier"`
+	IsExclusive    bool    `json:"is_exclusive"`
+	Status         string  `json:"status"`
+
+	SubscriptionType string   `json:"subscription_type"`
+	DailyLimitUSD    *float64 `json:"daily_limit_usd"`
+	WeeklyLimitUSD   *float64 `json:"weekly_limit_usd"`
+	MonthlyLimitUSD  *float64 `json:"monthly_limit_usd"`
+
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+
+	AccountGroups []AccountGroup `json:"account_groups,omitempty"`
+	AccountCount  int64          `json:"account_count,omitempty"`
+}
+
+type Account struct {
+	ID           int64          `json:"id"`
+	Name         string         `json:"name"`
+	Platform     string         `json:"platform"`
+	Type         string         `json:"type"`
+	Credentials  map[string]any `json:"credentials"`
+	Extra        map[string]any `json:"extra"`
+	ProxyID      *int64         `json:"proxy_id"`
+	Concurrency  int            `json:"concurrency"`
+	Priority     int            `json:"priority"`
+	Status       string         `json:"status"`
+	ErrorMessage string         `json:"error_message"`
+	LastUsedAt   *time.Time     `json:"last_used_at"`
+	CreatedAt    time.Time      `json:"created_at"`
+	UpdatedAt    time.Time      `json:"updated_at"`
+
+	Schedulable bool `json:"schedulable"`
+
+	RateLimitedAt    *time.Time `json:"rate_limited_at"`
+	RateLimitResetAt *time.Time `json:"rate_limit_reset_at"`
+	OverloadUntil    *time.Time `json:"overload_until"`
+
+	SessionWindowStart  *time.Time `json:"session_window_start"`
+	SessionWindowEnd    *time.Time `json:"session_window_end"`
+	SessionWindowStatus string     `json:"session_window_status"`
+
+	Proxy         *Proxy         `json:"proxy,omitempty"`
+	AccountGroups []AccountGroup `json:"account_groups,omitempty"`
+
+	GroupIDs []int64  `json:"group_ids,omitempty"`
+	Groups   []*Group `json:"groups,omitempty"`
+}
+
+type AccountGroup struct {
+	AccountID int64     `json:"account_id"`
+	GroupID   int64     `json:"group_id"`
+	Priority  int       `json:"priority"`
+	CreatedAt time.Time `json:"created_at"`
+
+	Account *Account `json:"account,omitempty"`
+	Group   *Group   `json:"group,omitempty"`
+}
+
+type Proxy struct {
+	ID        int64     `json:"id"`
+	Name      string    `json:"name"`
+	Protocol  string    `json:"protocol"`
+	Host      string    `json:"host"`
+	Port      int       `json:"port"`
+	Username  string    `json:"username"`
+	Password  string    `json:"-"`
+	Status    string    `json:"status"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type ProxyWithAccountCount struct {
+	Proxy
+	AccountCount int64 `json:"account_count"`
+}
+
+type RedeemCode struct {
+	ID        int64      `json:"id"`
+	Code      string     `json:"code"`
+	Type      string     `json:"type"`
+	Value     float64    `json:"value"`
+	Status    string     `json:"status"`
+	UsedBy    *int64     `json:"used_by"`
+	UsedAt    *time.Time `json:"used_at"`
+	Notes     string     `json:"notes"`
+	CreatedAt time.Time  `json:"created_at"`
+
+	GroupID      *int64 `json:"group_id"`
+	ValidityDays int    `json:"validity_days"`
+
+	User  *User  `json:"user,omitempty"`
+	Group *Group `json:"group,omitempty"`
+}
+
+type UsageLog struct {
+	ID        int64  `json:"id"`
+	UserID    int64  `json:"user_id"`
+	ApiKeyID  int64  `json:"api_key_id"`
+	AccountID int64  `json:"account_id"`
+	RequestID string `json:"request_id"`
+	Model     string `json:"model"`
+
+	GroupID        *int64 `json:"group_id"`
+	SubscriptionID *int64 `json:"subscription_id"`
+
+	InputTokens         int `json:"input_tokens"`
+	OutputTokens        int `json:"output_tokens"`
+	CacheCreationTokens int `json:"cache_creation_tokens"`
+	CacheReadTokens     int `json:"cache_read_tokens"`
+
+	CacheCreation5mTokens int `json:"cache_creation_5m_tokens"`
+	CacheCreation1hTokens int `json:"cache_creation_1h_tokens"`
+
+	InputCost         float64 `json:"input_cost"`
+	OutputCost        float64 `json:"output_cost"`
+	CacheCreationCost float64 `json:"cache_creation_cost"`
+	CacheReadCost     float64 `json:"cache_read_cost"`
+	TotalCost         float64 `json:"total_cost"`
+	ActualCost        float64 `json:"actual_cost"`
+	RateMultiplier    float64 `json:"rate_multiplier"`
+
+	BillingType  int8 `json:"billing_type"`
+	Stream       bool `json:"stream"`
+	DurationMs   *int `json:"duration_ms"`
+	FirstTokenMs *int `json:"first_token_ms"`
+
+	CreatedAt time.Time `json:"created_at"`
+
+	User         *User             `json:"user,omitempty"`
+	ApiKey       *ApiKey           `json:"api_key,omitempty"`
+	Account      *Account          `json:"account,omitempty"`
+	Group        *Group            `json:"group,omitempty"`
+	Subscription *UserSubscription `json:"subscription,omitempty"`
+}
+
+type Setting struct {
+	ID        int64     `json:"id"`
+	Key       string    `json:"key"`
+	Value     string    `json:"value"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type UserSubscription struct {
+	ID      int64 `json:"id"`
+	UserID  int64 `json:"user_id"`
+	GroupID int64 `json:"group_id"`
+
+	StartsAt  time.Time `json:"starts_at"`
+	ExpiresAt time.Time `json:"expires_at"`
+	Status    string    `json:"status"`
+
+	DailyWindowStart   *time.Time `json:"daily_window_start"`
+	WeeklyWindowStart  *time.Time `json:"weekly_window_start"`
+	MonthlyWindowStart *time.Time `json:"monthly_window_start"`
+
+	DailyUsageUSD   float64 `json:"daily_usage_usd"`
+	WeeklyUsageUSD  float64 `json:"weekly_usage_usd"`
+	MonthlyUsageUSD float64 `json:"monthly_usage_usd"`
+
+	AssignedBy *int64    `json:"assigned_by"`
+	AssignedAt time.Time `json:"assigned_at"`
+	Notes      string    `json:"notes"`
+
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+
+	User           *User  `json:"user,omitempty"`
+	Group          *Group `json:"group,omitempty"`
+	AssignedByUser *User  `json:"assigned_by_user,omitempty"`
+}
--- a/backend/internal/handler/gateway_handler.go
+++ b/backend/internal/handler/gateway_handler.go
@@ -10,7 +10,6 @@ import (
 	"strings"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
@@ -47,7 +46,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 		return
 	}

-	user, ok := middleware2.GetUserFromContext(c)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
 		h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
 		return
@@ -82,8 +81,8 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	subscription, _ := middleware2.GetSubscriptionFromContext(c)

 	// 0. 检查wait队列是否已满
-	maxWait := service.CalculateMaxWait(user.Concurrency)
-	canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), user.ID, maxWait)
+	maxWait := service.CalculateMaxWait(subject.Concurrency)
+	canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), subject.UserID, maxWait)
 	if err != nil {
 		log.Printf("Increment wait count failed: %v", err)
 		// On error, allow request to proceed
@@ -92,10 +91,10 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 		return
 	}
 	// 确保在函数退出时减少wait计数
-	defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), user.ID)
+	defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.UserID)

 	// 1. 首先获取用户并发槽位
-	userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, user, req.Stream, &streamStarted)
+	userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, subject.UserID, subject.Concurrency, req.Stream, &streamStarted)
 	if err != nil {
 		log.Printf("User concurrency acquire failed: %v", err)
 		h.handleConcurrencyError(c, err, "user", streamStarted)
@@ -106,7 +105,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	}

 	// 2. 【新增】Wait后二次检查余额/订阅
-	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), user, apiKey, apiKey.Group, subscription); err != nil {
+	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		log.Printf("Billing eligibility check failed after wait: %v", err)
 		h.handleStreamingAwareError(c, http.StatusForbidden, "billing_error", err.Error(), streamStarted)
 		return
@@ -133,7 +132,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	}

 	// 3. 获取账号并发槽位
-	accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account, req.Stream, &streamStarted)
+	accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, req.Stream, &streamStarted)
 	if err != nil {
 		log.Printf("Account concurrency acquire failed: %v", err)
 		h.handleConcurrencyError(c, err, "account", streamStarted)
@@ -158,7 +157,7 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 		if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
 			Result:       result,
 			ApiKey:       apiKey,
-			User:         user,
+			User:         apiKey.User,
 			Account:      account,
 			Subscription: subscription,
 		}); err != nil {
@@ -198,7 +197,7 @@ func (h *GatewayHandler) Usage(c *gin.Context) {
 		return
 	}

-	user, ok := middleware2.GetUserFromContext(c)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
 		h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
 		return
@@ -223,7 +222,7 @@ func (h *GatewayHandler) Usage(c *gin.Context) {
 	}

 	// 余额模式：返回钱包余额
-	latestUser, err := h.userService.GetByID(c.Request.Context(), user.ID)
+	latestUser, err := h.userService.GetByID(c.Request.Context(), subject.UserID)
 	if err != nil {
 		h.errorResponse(c, http.StatusInternalServerError, "api_error", "Failed to get user info")
 		return
@@ -241,7 +240,7 @@ func (h *GatewayHandler) Usage(c *gin.Context) {
 // 逻辑：
 // 1. 如果日/周/月任一限额达到100%，返回0
 // 2. 否则返回所有已配置周期中剩余额度的最小值
-func (h *GatewayHandler) calculateSubscriptionRemaining(group *model.Group, sub *model.UserSubscription) float64 {
+func (h *GatewayHandler) calculateSubscriptionRemaining(group *service.Group, sub *service.UserSubscription) float64 {
 	var remainingValues []float64

 	// 检查日限额
@@ -334,7 +333,7 @@ func (h *GatewayHandler) CountTokens(c *gin.Context) {
 		return
 	}

-	user, ok := middleware2.GetUserFromContext(c)
+	_, ok = middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
 		h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
 		return
@@ -366,7 +365,7 @@ func (h *GatewayHandler) CountTokens(c *gin.Context) {

 	// 校验 billing eligibility（订阅/余额）
 	// 【注意】不计算并发，但需要校验订阅/余额
-	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), user, apiKey, apiKey.Group, subscription); err != nil {
+	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		h.errorResponse(c, http.StatusForbidden, "billing_error", err.Error())
 		return
 	}
--- a/backend/internal/handler/gateway_helper.go
+++ b/backend/internal/handler/gateway_helper.go
@@ -6,7 +6,6 @@ import (
 	"net/http"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -69,11 +68,11 @@ func (h *ConcurrencyHelper) DecrementWaitCount(ctx context.Context, userID int64
 // AcquireUserSlotWithWait acquires a user concurrency slot, waiting if necessary.
 // For streaming requests, sends ping events during the wait.
 // streamStarted is updated if streaming response has begun.
-func (h *ConcurrencyHelper) AcquireUserSlotWithWait(c *gin.Context, user *model.User, isStream bool, streamStarted *bool) (func(), error) {
+func (h *ConcurrencyHelper) AcquireUserSlotWithWait(c *gin.Context, userID int64, maxConcurrency int, isStream bool, streamStarted *bool) (func(), error) {
 	ctx := c.Request.Context()

 	// Try to acquire immediately
-	result, err := h.concurrencyService.AcquireUserSlot(ctx, user.ID, user.Concurrency)
+	result, err := h.concurrencyService.AcquireUserSlot(ctx, userID, maxConcurrency)
 	if err != nil {
 		return nil, err
 	}
@@ -83,17 +82,17 @@ func (h *ConcurrencyHelper) AcquireUserSlotWithWait(c *gin.Context, user *model.
 	}

 	// Need to wait - handle streaming ping if needed
-	return h.waitForSlotWithPing(c, "user", user.ID, user.Concurrency, isStream, streamStarted)
+	return h.waitForSlotWithPing(c, "user", userID, maxConcurrency, isStream, streamStarted)
 }

 // AcquireAccountSlotWithWait acquires an account concurrency slot, waiting if necessary.
 // For streaming requests, sends ping events during the wait.
 // streamStarted is updated if streaming response has begun.
-func (h *ConcurrencyHelper) AcquireAccountSlotWithWait(c *gin.Context, account *model.Account, isStream bool, streamStarted *bool) (func(), error) {
+func (h *ConcurrencyHelper) AcquireAccountSlotWithWait(c *gin.Context, accountID int64, maxConcurrency int, isStream bool, streamStarted *bool) (func(), error) {
 	ctx := c.Request.Context()

 	// Try to acquire immediately
-	result, err := h.concurrencyService.AcquireAccountSlot(ctx, account.ID, account.Concurrency)
+	result, err := h.concurrencyService.AcquireAccountSlot(ctx, accountID, maxConcurrency)
 	if err != nil {
 		return nil, err
 	}
@@ -103,7 +102,7 @@ func (h *ConcurrencyHelper) AcquireAccountSlotWithWait(c *gin.Context, account *
 	}

 	// Need to wait - handle streaming ping if needed
-	return h.waitForSlotWithPing(c, "account", account.ID, account.Concurrency, isStream, streamStarted)
+	return h.waitForSlotWithPing(c, "account", accountID, maxConcurrency, isStream, streamStarted)
 }

 // waitForSlotWithPing waits for a concurrency slot, sending ping events for streaming requests.
--- a/backend/internal/handler/openai_gateway_handler.go
+++ b/backend/internal/handler/openai_gateway_handler.go
@@ -46,7 +46,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 		return
 	}

-	user, ok := middleware2.GetUserFromContext(c)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
 		h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
 		return
@@ -94,8 +94,8 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	subscription, _ := middleware2.GetSubscriptionFromContext(c)

 	// 0. Check if wait queue is full
-	maxWait := service.CalculateMaxWait(user.Concurrency)
-	canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), user.ID, maxWait)
+	maxWait := service.CalculateMaxWait(subject.Concurrency)
+	canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), subject.UserID, maxWait)
 	if err != nil {
 		log.Printf("Increment wait count failed: %v", err)
 		// On error, allow request to proceed
@@ -104,10 +104,10 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 		return
 	}
 	// Ensure wait count is decremented when function exits
-	defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), user.ID)
+	defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.UserID)

 	// 1. First acquire user concurrency slot
-	userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, user, reqStream, &streamStarted)
+	userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, subject.UserID, subject.Concurrency, reqStream, &streamStarted)
 	if err != nil {
 		log.Printf("User concurrency acquire failed: %v", err)
 		h.handleConcurrencyError(c, err, "user", streamStarted)
@@ -118,7 +118,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	}

 	// 2. Re-check billing eligibility after wait
-	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), user, apiKey, apiKey.Group, subscription); err != nil {
+	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		log.Printf("Billing eligibility check failed after wait: %v", err)
 		h.handleStreamingAwareError(c, http.StatusForbidden, "billing_error", err.Error(), streamStarted)
 		return
@@ -138,7 +138,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	log.Printf("[OpenAI Handler] Selected account: id=%d name=%s", account.ID, account.Name)

 	// 3. Acquire account concurrency slot
-	accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account, reqStream, &streamStarted)
+	accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, reqStream, &streamStarted)
 	if err != nil {
 		log.Printf("Account concurrency acquire failed: %v", err)
 		h.handleConcurrencyError(c, err, "account", streamStarted)
@@ -163,7 +163,7 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 		if err := h.gatewayService.RecordUsage(ctx, &service.OpenAIRecordUsageInput{
 			Result:       result,
 			ApiKey:       apiKey,
-			User:         user,
+			User:         apiKey.User,
 			Account:      account,
 			Subscription: subscription,
 		}); err != nil {
--- a/backend/internal/handler/redeem_handler.go
+++ b/backend/internal/handler/redeem_handler.go
@@ -1,8 +1,9 @@
 package handler

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -37,15 +38,9 @@ type RedeemResponse struct {
 // Redeem handles redeeming a code
 // POST /api/v1/redeem
 func (h *RedeemHandler) Redeem(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -55,38 +50,36 @@ func (h *RedeemHandler) Redeem(c *gin.Context) {
 		return
 	}

-	result, err := h.redeemService.Redeem(c.Request.Context(), user.ID, req.Code)
+	result, err := h.redeemService.Redeem(c.Request.Context(), subject.UserID, req.Code)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, result)
+	response.Success(c, dto.RedeemCodeFromService(result))
 }

 // GetHistory returns the user's redemption history
 // GET /api/v1/redeem/history
 func (h *RedeemHandler) GetHistory(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

 	// Default limit is 25
 	limit := 25

-	codes, err := h.redeemService.GetUserHistory(c.Request.Context(), user.ID, limit)
+	codes, err := h.redeemService.GetUserHistory(c.Request.Context(), subject.UserID, limit)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, codes)
+	out := make([]dto.RedeemCode, 0, len(codes))
+	for i := range codes {
+		out = append(out, *dto.RedeemCodeFromService(&codes[i]))
+	}
+	response.Success(c, out)
 }
--- a/backend/internal/handler/setting_handler.go
+++ b/backend/internal/handler/setting_handler.go
@@ -1,6 +1,7 @@
 package handler

 import (
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/service"

@@ -30,6 +31,17 @@ func (h *SettingHandler) GetPublicSettings(c *gin.Context) {
 		return
 	}

-	settings.Version = h.version
-	response.Success(c, settings)
+	response.Success(c, dto.PublicSettings{
+		RegistrationEnabled: settings.RegistrationEnabled,
+		EmailVerifyEnabled:  settings.EmailVerifyEnabled,
+		TurnstileEnabled:    settings.TurnstileEnabled,
+		TurnstileSiteKey:    settings.TurnstileSiteKey,
+		SiteName:            settings.SiteName,
+		SiteLogo:            settings.SiteLogo,
+		SiteSubtitle:        settings.SiteSubtitle,
+		ApiBaseUrl:          settings.ApiBaseUrl,
+		ContactInfo:         settings.ContactInfo,
+		DocUrl:              settings.DocUrl,
+		Version:             h.version,
+	})
 }
--- a/backend/internal/handler/subscription_handler.go
+++ b/backend/internal/handler/subscription_handler.go
@@ -1,8 +1,9 @@
 package handler

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -25,7 +26,7 @@ type SubscriptionSummaryItem struct {

 // SubscriptionProgressInfo represents subscription with progress info
 type SubscriptionProgressInfo struct {
-	Subscription *model.UserSubscription       `json:"subscription"`
+	Subscription *dto.UserSubscription         `json:"subscription"`
 	Progress     *service.SubscriptionProgress `json:"progress"`
 }

@@ -44,68 +45,58 @@ func NewSubscriptionHandler(subscriptionService *service.SubscriptionService) *S
 // List handles listing current user's subscriptions
 // GET /api/v1/subscriptions
 func (h *SubscriptionHandler) List(c *gin.Context) {
-	user, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not found in context")
 		return
 	}

-	u, ok := user.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user in context")
-		return
-	}
-
-	subscriptions, err := h.subscriptionService.ListUserSubscriptions(c.Request.Context(), u.ID)
+	subscriptions, err := h.subscriptionService.ListUserSubscriptions(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, subscriptions)
+	out := make([]dto.UserSubscription, 0, len(subscriptions))
+	for i := range subscriptions {
+		out = append(out, *dto.UserSubscriptionFromService(&subscriptions[i]))
+	}
+	response.Success(c, out)
 }

 // GetActive handles getting current user's active subscriptions
 // GET /api/v1/subscriptions/active
 func (h *SubscriptionHandler) GetActive(c *gin.Context) {
-	user, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not found in context")
 		return
 	}

-	u, ok := user.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user in context")
-		return
-	}
-
-	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), u.ID)
+	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Success(c, subscriptions)
+	out := make([]dto.UserSubscription, 0, len(subscriptions))
+	for i := range subscriptions {
+		out = append(out, *dto.UserSubscriptionFromService(&subscriptions[i]))
+	}
+	response.Success(c, out)
 }

 // GetProgress handles getting subscription progress for current user
 // GET /api/v1/subscriptions/progress
 func (h *SubscriptionHandler) GetProgress(c *gin.Context) {
-	user, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not found in context")
 		return
 	}

-	u, ok := user.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user in context")
-		return
-	}
-
 	// Get all active subscriptions with progress
-	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), u.ID)
+	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -120,7 +111,7 @@ func (h *SubscriptionHandler) GetProgress(c *gin.Context) {
 			continue
 		}
 		result = append(result, SubscriptionProgressInfo{
-			Subscription: sub,
+			Subscription: dto.UserSubscriptionFromService(sub),
 			Progress:     progress,
 		})
 	}
@@ -131,20 +122,14 @@ func (h *SubscriptionHandler) GetProgress(c *gin.Context) {
 // GetSummary handles getting a summary of current user's subscription status
 // GET /api/v1/subscriptions/summary
 func (h *SubscriptionHandler) GetSummary(c *gin.Context) {
-	user, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not found in context")
 		return
 	}

-	u, ok := user.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user in context")
-		return
-	}
-
 	// Get all active subscriptions
-	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), u.ID)
+	subscriptions, err := h.subscriptionService.ListActiveUserSubscriptions(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
--- a/backend/internal/handler/usage_handler.go
+++ b/backend/internal/handler/usage_handler.go
@@ -4,10 +4,11 @@ import (
 	"strconv"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -30,15 +31,9 @@ func NewUsageHandler(usageService *service.UsageService, apiKeyService *service.
 // List handles listing usage records with pagination
 // GET /api/v1/usage
 func (h *UsageHandler) List(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -58,7 +53,7 @@ func (h *UsageHandler) List(c *gin.Context) {
 			response.ErrorFrom(c, err)
 			return
 		}
-		if apiKey.UserID != user.ID {
+		if apiKey.UserID != subject.UserID {
 			response.Forbidden(c, "Not authorized to access this API key's usage records")
 			return
 		}
@@ -67,35 +62,33 @@ func (h *UsageHandler) List(c *gin.Context) {
 	}

 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
-	var records []model.UsageLog
+	var records []service.UsageLog
 	var result *pagination.PaginationResult
 	var err error

 	if apiKeyID > 0 {
 		records, result, err = h.usageService.ListByApiKey(c.Request.Context(), apiKeyID, params)
 	} else {
-		records, result, err = h.usageService.ListByUser(c.Request.Context(), user.ID, params)
+		records, result, err = h.usageService.ListByUser(c.Request.Context(), subject.UserID, params)
 	}
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
 	}

-	response.Paginated(c, records, result.Total, page, pageSize)
+	out := make([]dto.UsageLog, 0, len(records))
+	for i := range records {
+		out = append(out, *dto.UsageLogFromService(&records[i]))
+	}
+	response.Paginated(c, out, result.Total, page, pageSize)
 }

 // GetByID handles getting a single usage record
 // GET /api/v1/usage/:id
 func (h *UsageHandler) GetByID(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -112,26 +105,20 @@ func (h *UsageHandler) GetByID(c *gin.Context) {
 	}

 	// 验证所有权
-	if record.UserID != user.ID {
+	if record.UserID != subject.UserID {
 		response.Forbidden(c, "Not authorized to access this record")
 		return
 	}

-	response.Success(c, record)
+	response.Success(c, dto.UsageLogFromService(record))
 }

 // Stats handles getting usage statistics
 // GET /api/v1/usage/stats
 func (h *UsageHandler) Stats(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -149,7 +136,7 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 			response.NotFound(c, "API key not found")
 			return
 		}
-		if apiKey.UserID != user.ID {
+		if apiKey.UserID != subject.UserID {
 			response.Forbidden(c, "Not authorized to access this API key's statistics")
 			return
 		}
@@ -201,7 +188,7 @@ func (h *UsageHandler) Stats(c *gin.Context) {
 	if apiKeyID > 0 {
 		stats, err = h.usageService.GetStatsByApiKey(c.Request.Context(), apiKeyID, startTime, endTime)
 	} else {
-		stats, err = h.usageService.GetStatsByUser(c.Request.Context(), user.ID, startTime, endTime)
+		stats, err = h.usageService.GetStatsByUser(c.Request.Context(), subject.UserID, startTime, endTime)
 	}
 	if err != nil {
 		response.ErrorFrom(c, err)
@@ -245,19 +232,13 @@ func parseUserTimeRange(c *gin.Context) (time.Time, time.Time) {
 // DashboardStats handles getting user dashboard statistics
 // GET /api/v1/usage/dashboard/stats
 func (h *UsageHandler) DashboardStats(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not authenticated")
 		return
 	}

-	user, ok := userValue.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user context")
-		return
-	}
-
-	stats, err := h.usageService.GetUserDashboardStats(c.Request.Context(), user.ID)
+	stats, err := h.usageService.GetUserDashboardStats(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -269,22 +250,16 @@ func (h *UsageHandler) DashboardStats(c *gin.Context) {
 // DashboardTrend handles getting user usage trend data
 // GET /api/v1/usage/dashboard/trend
 func (h *UsageHandler) DashboardTrend(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

 	startTime, endTime := parseUserTimeRange(c)
 	granularity := c.DefaultQuery("granularity", "day")

-	trend, err := h.usageService.GetUserUsageTrendByUserID(c.Request.Context(), user.ID, startTime, endTime, granularity)
+	trend, err := h.usageService.GetUserUsageTrendByUserID(c.Request.Context(), subject.UserID, startTime, endTime, granularity)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -301,21 +276,15 @@ func (h *UsageHandler) DashboardTrend(c *gin.Context) {
 // DashboardModels handles getting user model usage statistics
 // GET /api/v1/usage/dashboard/models
 func (h *UsageHandler) DashboardModels(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

 	startTime, endTime := parseUserTimeRange(c)

-	stats, err := h.usageService.GetUserModelStats(c.Request.Context(), user.ID, startTime, endTime)
+	stats, err := h.usageService.GetUserModelStats(c.Request.Context(), subject.UserID, startTime, endTime)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -336,15 +305,9 @@ type BatchApiKeysUsageRequest struct {
 // DashboardApiKeysUsage handles getting usage stats for user's own API keys
 // POST /api/v1/usage/dashboard/api-keys-usage
 func (h *UsageHandler) DashboardApiKeysUsage(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -360,7 +323,7 @@ func (h *UsageHandler) DashboardApiKeysUsage(c *gin.Context) {
 	}

 	// Verify ownership of all requested API keys
-	userApiKeys, _, err := h.apiKeyService.List(c.Request.Context(), user.ID, pagination.PaginationParams{Page: 1, PageSize: 1000})
+	userApiKeys, _, err := h.apiKeyService.List(c.Request.Context(), subject.UserID, pagination.PaginationParams{Page: 1, PageSize: 1000})
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
--- a/backend/internal/handler/user_handler.go
+++ b/backend/internal/handler/user_handler.go
@@ -1,8 +1,9 @@
 package handler

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -35,19 +36,13 @@ type UpdateProfileRequest struct {
 // GetProfile handles getting user profile
 // GET /api/v1/users/me
 func (h *UserHandler) GetProfile(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
 		response.Unauthorized(c, "User not authenticated")
 		return
 	}

-	user, ok := userValue.(*model.User)
-	if !ok {
-		response.InternalError(c, "Invalid user context")
-		return
-	}
-
-	userData, err := h.userService.GetByID(c.Request.Context(), user.ID)
+	userData, err := h.userService.GetByID(c.Request.Context(), subject.UserID)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -56,21 +51,15 @@ func (h *UserHandler) GetProfile(c *gin.Context) {
 	// 清空notes字段，普通用户不应看到备注
 	userData.Notes = ""

-	response.Success(c, userData)
+	response.Success(c, dto.UserFromService(userData))
 }

 // ChangePassword handles changing user password
 // POST /api/v1/users/me/password
 func (h *UserHandler) ChangePassword(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -84,7 +73,7 @@ func (h *UserHandler) ChangePassword(c *gin.Context) {
 		CurrentPassword: req.OldPassword,
 		NewPassword:     req.NewPassword,
 	}
-	err := h.userService.ChangePassword(c.Request.Context(), user.ID, svcReq)
+	err := h.userService.ChangePassword(c.Request.Context(), subject.UserID, svcReq)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -96,15 +85,9 @@ func (h *UserHandler) ChangePassword(c *gin.Context) {
 // UpdateProfile handles updating user profile
 // PUT /api/v1/users/me
 func (h *UserHandler) UpdateProfile(c *gin.Context) {
-	userValue, exists := c.Get("user")
-	if !exists {
-		response.Unauthorized(c, "User not authenticated")
-		return
-	}
-
-	user, ok := userValue.(*model.User)
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
 	if !ok {
-		response.InternalError(c, "Invalid user context")
+		response.Unauthorized(c, "User not authenticated")
 		return
 	}

@@ -118,7 +101,7 @@ func (h *UserHandler) UpdateProfile(c *gin.Context) {
 		Username: req.Username,
 		Wechat:   req.Wechat,
 	}
-	updatedUser, err := h.userService.UpdateProfile(c.Request.Context(), user.ID, svcReq)
+	updatedUser, err := h.userService.UpdateProfile(c.Request.Context(), subject.UserID, svcReq)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -127,5 +110,5 @@ func (h *UserHandler) UpdateProfile(c *gin.Context) {
 	// 清空notes字段，普通用户不应看到备注
 	updatedUser.Notes = ""

-	response.Success(c, updatedUser)
+	response.Success(c, dto.UserFromService(updatedUser))
 }
--- a/backend/internal/infrastructure/database.go
+++ b/backend/internal/infrastructure/database.go
@@ -2,8 +2,8 @@ package infrastructure

 import (
 	"github.com/Wei-Shaw/sub2api/internal/config"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
+	"github.com/Wei-Shaw/sub2api/internal/repository"

 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
@@ -30,7 +30,7 @@ func InitDB(cfg *config.Config) (*gorm.DB, error) {

 	// 自动迁移（始终执行，确保数据库结构与代码同步）
 	// GORM 的 AutoMigrate 只会添加新字段，不会删除或修改已有字段，是安全的
-	if err := model.AutoMigrate(db); err != nil {
+	if err := repository.AutoMigrate(db); err != nil {
 		return nil, err
 	}

--- a/backend/internal/model/account.go
+++ b/backend/internal/model/account.go
@@ -1,415 +0,0 @@
-package model
-
-import (
-	"database/sql/driver"
-	"encoding/json"
-	"errors"
-	"time"
-
-	"gorm.io/gorm"
-)
-
-// JSONB 用于存储JSONB数据
-type JSONB map[string]any
-
-func (j JSONB) Value() (driver.Value, error) {
-	if j == nil {
-		return nil, nil
-	}
-	return json.Marshal(j)
-}
-
-func (j *JSONB) Scan(value any) error {
-	if value == nil {
-		*j = nil
-		return nil
-	}
-	bytes, ok := value.([]byte)
-	if !ok {
-		return errors.New("type assertion to []byte failed")
-	}
-	return json.Unmarshal(bytes, j)
-}
-
-type Account struct {
-	ID           int64          `gorm:"primaryKey" json:"id"`
-	Name         string         `gorm:"size:100;not null" json:"name"`
-	Platform     string         `gorm:"size:50;not null" json:"platform"`           // anthropic/openai/gemini
-	Type         string         `gorm:"size:20;not null" json:"type"`               // oauth/apikey
-	Credentials  JSONB          `gorm:"type:jsonb;default:'{}'" json:"credentials"` // 凭证(加密存储)
-	Extra        JSONB          `gorm:"type:jsonb;default:'{}'" json:"extra"`       // 扩展信息
-	ProxyID      *int64         `gorm:"index" json:"proxy_id"`
-	Concurrency  int            `gorm:"default:3;not null" json:"concurrency"`
-	Priority     int            `gorm:"default:50;not null" json:"priority"`           // 1-100，越小越高
-	Status       string         `gorm:"size:20;default:active;not null" json:"status"` // active/disabled/error
-	ErrorMessage string         `gorm:"type:text" json:"error_message"`
-	LastUsedAt   *time.Time     `gorm:"index" json:"last_used_at"`
-	CreatedAt    time.Time      `gorm:"not null" json:"created_at"`
-	UpdatedAt    time.Time      `gorm:"not null" json:"updated_at"`
-	DeletedAt    gorm.DeletedAt `gorm:"index" json:"-"`
-
-	// 调度控制
-	Schedulable bool `gorm:"default:true;not null" json:"schedulable"`
-
-	// 限流状态 (429)
-	RateLimitedAt    *time.Time `gorm:"index" json:"rate_limited_at"`
-	RateLimitResetAt *time.Time `gorm:"index" json:"rate_limit_reset_at"`
-
-	// 过载状态 (529)
-	OverloadUntil *time.Time `gorm:"index" json:"overload_until"`
-
-	// 5小时时间窗口
-	SessionWindowStart  *time.Time `json:"session_window_start"`
-	SessionWindowEnd    *time.Time `json:"session_window_end"`
-	SessionWindowStatus string     `gorm:"size:20" json:"session_window_status"` // allowed/allowed_warning/rejected
-
-	// 关联
-	Proxy         *Proxy         `gorm:"foreignKey:ProxyID" json:"proxy,omitempty"`
-	AccountGroups []AccountGroup `gorm:"foreignKey:AccountID" json:"account_groups,omitempty"`
-
-	// 虚拟字段 (不存储到数据库)
-	GroupIDs []int64  `gorm:"-" json:"group_ids,omitempty"`
-	Groups   []*Group `gorm:"-" json:"groups,omitempty"`
-}
-
-func (Account) TableName() string {
-	return "accounts"
-}
-
-// IsActive 检查是否激活
-func (a *Account) IsActive() bool {
-	return a.Status == "active"
-}
-
-// IsSchedulable 检查账号是否可调度
-func (a *Account) IsSchedulable() bool {
-	if !a.IsActive() || !a.Schedulable {
-		return false
-	}
-	now := time.Now()
-	if a.OverloadUntil != nil && now.Before(*a.OverloadUntil) {
-		return false
-	}
-	if a.RateLimitResetAt != nil && now.Before(*a.RateLimitResetAt) {
-		return false
-	}
-	return true
-}
-
-// IsRateLimited 检查是否处于限流状态
-func (a *Account) IsRateLimited() bool {
-	if a.RateLimitResetAt == nil {
-		return false
-	}
-	return time.Now().Before(*a.RateLimitResetAt)
-}
-
-// IsOverloaded 检查是否处于过载状态
-func (a *Account) IsOverloaded() bool {
-	if a.OverloadUntil == nil {
-		return false
-	}
-	return time.Now().Before(*a.OverloadUntil)
-}
-
-// IsOAuth 检查是否为OAuth类型账号（包括oauth和setup-token）
-func (a *Account) IsOAuth() bool {
-	return a.Type == AccountTypeOAuth || a.Type == AccountTypeSetupToken
-}
-
-// CanGetUsage 检查账号是否可以获取usage信息（只有oauth类型可以，setup-token没有profile权限）
-func (a *Account) CanGetUsage() bool {
-	return a.Type == AccountTypeOAuth
-}
-
-// GetCredential 获取凭证字段
-func (a *Account) GetCredential(key string) string {
-	if a.Credentials == nil {
-		return ""
-	}
-	if v, ok := a.Credentials[key]; ok {
-		if s, ok := v.(string); ok {
-			return s
-		}
-	}
-	return ""
-}
-
-// GetModelMapping 获取模型映射配置
-// 返回格式: map[请求模型名]实际模型名
-func (a *Account) GetModelMapping() map[string]string {
-	if a.Credentials == nil {
-		return nil
-	}
-	raw, ok := a.Credentials["model_mapping"]
-	if !ok || raw == nil {
-		return nil
-	}
-	// 处理map[string]interface{}类型
-	if m, ok := raw.(map[string]any); ok {
-		result := make(map[string]string)
-		for k, v := range m {
-			if s, ok := v.(string); ok {
-				result[k] = s
-			}
-		}
-		if len(result) > 0 {
-			return result
-		}
-	}
-	return nil
-}
-
-// IsModelSupported 检查请求的模型是否被该账号支持
-// 如果没有设置模型映射，则支持所有模型
-func (a *Account) IsModelSupported(requestedModel string) bool {
-	mapping := a.GetModelMapping()
-	if len(mapping) == 0 {
-		return true // 没有映射配置，支持所有模型
-	}
-	_, exists := mapping[requestedModel]
-	return exists
-}
-
-// GetMappedModel 获取映射后的实际模型名
-// 如果没有映射，返回原始模型名
-func (a *Account) GetMappedModel(requestedModel string) string {
-	mapping := a.GetModelMapping()
-	if len(mapping) == 0 {
-		return requestedModel
-	}
-	if mappedModel, exists := mapping[requestedModel]; exists {
-		return mappedModel
-	}
-	return requestedModel
-}
-
-// GetBaseURL 获取API基础URL（用于apikey类型账号）
-func (a *Account) GetBaseURL() string {
-	if a.Type != AccountTypeApiKey {
-		return ""
-	}
-	baseURL := a.GetCredential("base_url")
-	if baseURL == "" {
-		return "https://api.anthropic.com" // 默认URL
-	}
-	return baseURL
-}
-
-// GetExtraString 从Extra字段获取字符串值
-func (a *Account) GetExtraString(key string) string {
-	if a.Extra == nil {
-		return ""
-	}
-	if v, ok := a.Extra[key]; ok {
-		if s, ok := v.(string); ok {
-			return s
-		}
-	}
-	return ""
-}
-
-// IsCustomErrorCodesEnabled 检查是否启用自定义错误码功能（仅适用于 apikey 类型）
-func (a *Account) IsCustomErrorCodesEnabled() bool {
-	if a.Type != AccountTypeApiKey || a.Credentials == nil {
-		return false
-	}
-	if v, ok := a.Credentials["custom_error_codes_enabled"]; ok {
-		if enabled, ok := v.(bool); ok {
-			return enabled
-		}
-	}
-	return false
-}
-
-// GetCustomErrorCodes 获取自定义错误码列表
-func (a *Account) GetCustomErrorCodes() []int {
-	if a.Credentials == nil {
-		return nil
-	}
-	raw, ok := a.Credentials["custom_error_codes"]
-	if !ok || raw == nil {
-		return nil
-	}
-	// 处理 []interface{} 类型（JSON反序列化后的格式）
-	if arr, ok := raw.([]any); ok {
-		result := make([]int, 0, len(arr))
-		for _, v := range arr {
-			// JSON 数字默认解析为 float64
-			if f, ok := v.(float64); ok {
-				result = append(result, int(f))
-			}
-		}
-		return result
-	}
-	return nil
-}
-
-// ShouldHandleErrorCode 检查指定错误码是否应该被处理（停止调度/标记限流等）
-// 如果未启用自定义错误码或列表为空，返回 true（使用默认策略）
-// 如果启用且列表非空，只有在列表中的错误码才返回 true
-func (a *Account) ShouldHandleErrorCode(statusCode int) bool {
-	if !a.IsCustomErrorCodesEnabled() {
-		return true // 未启用，使用默认策略
-	}
-	codes := a.GetCustomErrorCodes()
-	if len(codes) == 0 {
-		return true // 启用但列表为空，fallback到默认策略
-	}
-	// 检查是否在自定义列表中
-	for _, code := range codes {
-		if code == statusCode {
-			return true
-		}
-	}
-	return false
-}
-
-// IsInterceptWarmupEnabled 检查是否启用预热请求拦截
-// 启用后，标题生成、Warmup等预热请求将返回mock响应，不消耗上游token
-func (a *Account) IsInterceptWarmupEnabled() bool {
-	if a.Credentials == nil {
-		return false
-	}
-	if v, ok := a.Credentials["intercept_warmup_requests"]; ok {
-		if enabled, ok := v.(bool); ok {
-			return enabled
-		}
-	}
-	return false
-}
-
-// =============== OpenAI 相关方法 ===============
-
-// IsOpenAI 检查是否为 OpenAI 平台账号
-func (a *Account) IsOpenAI() bool {
-	return a.Platform == PlatformOpenAI
-}
-
-// IsAnthropic 检查是否为 Anthropic 平台账号
-func (a *Account) IsAnthropic() bool {
-	return a.Platform == PlatformAnthropic
-}
-
-// IsOpenAIOAuth 检查是否为 OpenAI OAuth 类型账号
-func (a *Account) IsOpenAIOAuth() bool {
-	return a.IsOpenAI() && a.Type == AccountTypeOAuth
-}
-
-// IsOpenAIApiKey 检查是否为 OpenAI API Key 类型账号（Response 账号）
-func (a *Account) IsOpenAIApiKey() bool {
-	return a.IsOpenAI() && a.Type == AccountTypeApiKey
-}
-
-// GetOpenAIBaseURL 获取 OpenAI API 基础 URL
-// 对于 API Key 类型账号，从 credentials 中获取 base_url
-// 对于 OAuth 类型账号，返回默认的 OpenAI API URL
-func (a *Account) GetOpenAIBaseURL() string {
-	if !a.IsOpenAI() {
-		return ""
-	}
-	if a.Type == AccountTypeApiKey {
-		baseURL := a.GetCredential("base_url")
-		if baseURL != "" {
-			return baseURL
-		}
-	}
-	return "https://api.openai.com" // OpenAI 默认 API URL
-}
-
-// GetOpenAIAccessToken 获取 OpenAI 访问令牌
-func (a *Account) GetOpenAIAccessToken() string {
-	if !a.IsOpenAI() {
-		return ""
-	}
-	return a.GetCredential("access_token")
-}
-
-// GetOpenAIRefreshToken 获取 OpenAI 刷新令牌
-func (a *Account) GetOpenAIRefreshToken() string {
-	if !a.IsOpenAIOAuth() {
-		return ""
-	}
-	return a.GetCredential("refresh_token")
-}
-
-// GetOpenAIIDToken 获取 OpenAI ID Token（JWT，包含用户信息）
-func (a *Account) GetOpenAIIDToken() string {
-	if !a.IsOpenAIOAuth() {
-		return ""
-	}
-	return a.GetCredential("id_token")
-}
-
-// GetOpenAIApiKey 获取 OpenAI API Key（用于 Response 账号）
-func (a *Account) GetOpenAIApiKey() string {
-	if !a.IsOpenAIApiKey() {
-		return ""
-	}
-	return a.GetCredential("api_key")
-}
-
-// GetOpenAIUserAgent 获取 OpenAI 自定义 User-Agent
-// 返回空字符串表示透传原始 User-Agent
-func (a *Account) GetOpenAIUserAgent() string {
-	if !a.IsOpenAI() {
-		return ""
-	}
-	return a.GetCredential("user_agent")
-}
-
-// GetChatGPTAccountID 获取 ChatGPT 账号 ID（从 ID Token 解析）
-func (a *Account) GetChatGPTAccountID() string {
-	if !a.IsOpenAIOAuth() {
-		return ""
-	}
-	return a.GetCredential("chatgpt_account_id")
-}
-
-// GetChatGPTUserID 获取 ChatGPT 用户 ID（从 ID Token 解析）
-func (a *Account) GetChatGPTUserID() string {
-	if !a.IsOpenAIOAuth() {
-		return ""
-	}
-	return a.GetCredential("chatgpt_user_id")
-}
-
-// GetOpenAIOrganizationID 获取 OpenAI 组织 ID
-func (a *Account) GetOpenAIOrganizationID() string {
-	if !a.IsOpenAIOAuth() {
-		return ""
-	}
-	return a.GetCredential("organization_id")
-}
-
-// GetOpenAITokenExpiresAt 获取 OpenAI Token 过期时间
-func (a *Account) GetOpenAITokenExpiresAt() *time.Time {
-	if !a.IsOpenAIOAuth() {
-		return nil
-	}
-	expiresAtStr := a.GetCredential("expires_at")
-	if expiresAtStr == "" {
-		return nil
-	}
-	// 尝试解析时间
-	t, err := time.Parse(time.RFC3339, expiresAtStr)
-	if err != nil {
-		// 尝试解析为 Unix 时间戳
-		if v, ok := a.Credentials["expires_at"].(float64); ok {
-			t = time.Unix(int64(v), 0)
-			return &t
-		}
-		return nil
-	}
-	return &t
-}
-
-// IsOpenAITokenExpired 检查 OpenAI Token 是否过期
-func (a *Account) IsOpenAITokenExpired() bool {
-	expiresAt := a.GetOpenAITokenExpiresAt()
-	if expiresAt == nil {
-		return false // 没有过期时间信息，假设未过期
-	}
-	// 提前 60 秒认为过期，便于刷新
-	return time.Now().Add(60 * time.Second).After(*expiresAt)
-}
--- a/backend/internal/model/account_group.go
+++ b/backend/internal/model/account_group.go
@@ -1,20 +0,0 @@
-package model
-
-import (
-	"time"
-)
-
-type AccountGroup struct {
-	AccountID int64     `gorm:"primaryKey" json:"account_id"`
-	GroupID   int64     `gorm:"primaryKey" json:"group_id"`
-	Priority  int       `gorm:"default:50;not null" json:"priority"` // 分组内优先级
-	CreatedAt time.Time `gorm:"not null" json:"created_at"`
-
-	// 关联
-	Account *Account `gorm:"foreignKey:AccountID" json:"account,omitempty"`
-	Group   *Group   `gorm:"foreignKey:GroupID" json:"group,omitempty"`
-}
-
-func (AccountGroup) TableName() string {
-	return "account_groups"
-}
--- a/backend/internal/model/api_key.go
+++ b/backend/internal/model/api_key.go
@@ -1,32 +0,0 @@
-package model
-
-import (
-	"time"
-
-	"gorm.io/gorm"
-)
-
-type ApiKey struct {
-	ID        int64          `gorm:"primaryKey" json:"id"`
-	UserID    int64          `gorm:"index;not null" json:"user_id"`
-	Key       string         `gorm:"uniqueIndex;size:128;not null" json:"key"` // sk-xxx
-	Name      string         `gorm:"size:100;not null" json:"name"`
-	GroupID   *int64         `gorm:"index" json:"group_id"`
-	Status    string         `gorm:"size:20;default:active;not null" json:"status"` // active/disabled
-	CreatedAt time.Time      `gorm:"not null" json:"created_at"`
-	UpdatedAt time.Time      `gorm:"not null" json:"updated_at"`
-	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
-
-	// 关联
-	User  *User  `gorm:"foreignKey:UserID" json:"user,omitempty"`
-	Group *Group `gorm:"foreignKey:GroupID" json:"group,omitempty"`
-}
-
-func (ApiKey) TableName() string {
-	return "api_keys"
-}
-
-// IsActive 检查是否激活
-func (k *ApiKey) IsActive() bool {
-	return k.Status == "active"
-}
--- a/backend/internal/model/group.go
+++ b/backend/internal/model/group.go
@@ -1,73 +0,0 @@
-package model
-
-import (
-	"time"
-
-	"gorm.io/gorm"
-)
-
-// 订阅类型常量
-const (
-	SubscriptionTypeStandard     = "standard"     // 标准计费模式（按余额扣费）
-	SubscriptionTypeSubscription = "subscription" // 订阅模式（按限额控制）
-)
-
-type Group struct {
-	ID             int64   `gorm:"primaryKey" json:"id"`
-	Name           string  `gorm:"uniqueIndex;size:100;not null" json:"name"`
-	Description    string  `gorm:"type:text" json:"description"`
-	Platform       string  `gorm:"size:50;default:anthropic;not null" json:"platform"` // anthropic/openai/gemini
-	RateMultiplier float64 `gorm:"type:decimal(10,4);default:1.0;not null" json:"rate_multiplier"`
-	IsExclusive    bool    `gorm:"default:false;not null" json:"is_exclusive"`
-	Status         string  `gorm:"size:20;default:active;not null" json:"status"` // active/disabled
-
-	// 订阅功能字段
-	SubscriptionType string   `gorm:"size:20;default:standard;not null" json:"subscription_type"` // standard/subscription
-	DailyLimitUSD    *float64 `gorm:"type:decimal(20,8)" json:"daily_limit_usd"`
-	WeeklyLimitUSD   *float64 `gorm:"type:decimal(20,8)" json:"weekly_limit_usd"`
-	MonthlyLimitUSD  *float64 `gorm:"type:decimal(20,8)" json:"monthly_limit_usd"`
-
-	CreatedAt time.Time      `gorm:"not null" json:"created_at"`
-	UpdatedAt time.Time      `gorm:"not null" json:"updated_at"`
-	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
-
-	// 关联
-	AccountGroups []AccountGroup `gorm:"foreignKey:GroupID" json:"account_groups,omitempty"`
-
-	// 虚拟字段 (不存储到数据库)
-	AccountCount int64 `gorm:"-" json:"account_count,omitempty"`
-}
-
-func (Group) TableName() string {
-	return "groups"
-}
-
-// IsActive 检查是否激活
-func (g *Group) IsActive() bool {
-	return g.Status == "active"
-}
-
-// IsSubscriptionType 检查是否为订阅类型分组
-func (g *Group) IsSubscriptionType() bool {
-	return g.SubscriptionType == SubscriptionTypeSubscription
-}
-
-// IsFreeSubscription 检查是否为免费订阅（不扣余额但有限额）
-func (g *Group) IsFreeSubscription() bool {
-	return g.IsSubscriptionType() && g.RateMultiplier == 0
-}
-
-// HasDailyLimit 检查是否有日限额
-func (g *Group) HasDailyLimit() bool {
-	return g.DailyLimitUSD != nil && *g.DailyLimitUSD > 0
-}
-
-// HasWeeklyLimit 检查是否有周限额
-func (g *Group) HasWeeklyLimit() bool {
-	return g.WeeklyLimitUSD != nil && *g.WeeklyLimitUSD > 0
-}
-
-// HasMonthlyLimit 检查是否有月限额
-func (g *Group) HasMonthlyLimit() bool {
-	return g.MonthlyLimitUSD != nil && *g.MonthlyLimitUSD > 0
-}
--- a/backend/internal/model/model.go
+++ b/backend/internal/model/model.go
@@ -1,64 +0,0 @@
-package model
-
-import (
-	"gorm.io/gorm"
-)
-
-// AutoMigrate 自动迁移所有模型
-func AutoMigrate(db *gorm.DB) error {
-	return db.AutoMigrate(
-		&User{},
-		&ApiKey{},
-		&Group{},
-		&Account{},
-		&AccountGroup{},
-		&Proxy{},
-		&RedeemCode{},
-		&UsageLog{},
-		&Setting{},
-		&UserSubscription{},
-	)
-}
-
-// 状态常量
-const (
-	StatusActive   = "active"
-	StatusDisabled = "disabled"
-	StatusError    = "error"
-	StatusUnused   = "unused"
-	StatusUsed     = "used"
-	StatusExpired  = "expired"
-)
-
-// 角色常量
-const (
-	RoleAdmin = "admin"
-	RoleUser  = "user"
-)
-
-// 平台常量
-const (
-	PlatformAnthropic = "anthropic"
-	PlatformOpenAI    = "openai"
-	PlatformGemini    = "gemini"
-)
-
-// 账号类型常量
-const (
-	AccountTypeOAuth      = "oauth"       // OAuth类型账号（full scope: profile + inference）
-	AccountTypeSetupToken = "setup-token" // Setup Token类型账号（inference only scope）
-	AccountTypeApiKey     = "apikey"      // API Key类型账号
-)
-
-// 卡密类型常量
-const (
-	RedeemTypeBalance      = "balance"
-	RedeemTypeConcurrency  = "concurrency"
-	RedeemTypeSubscription = "subscription"
-)
-
-// 管理员调整类型常量
-const (
-	AdjustmentTypeAdminBalance     = "admin_balance"     // 管理员调整余额
-	AdjustmentTypeAdminConcurrency = "admin_concurrency" // 管理员调整并发数
-)
--- a/backend/internal/model/proxy.go
+++ b/backend/internal/model/proxy.go
@@ -1,45 +0,0 @@
-package model
-
-import (
-	"fmt"
-	"time"
-
-	"gorm.io/gorm"
-)
-
-type Proxy struct {
-	ID        int64          `gorm:"primaryKey" json:"id"`
-	Name      string         `gorm:"size:100;not null" json:"name"`
-	Protocol  string         `gorm:"size:20;not null" json:"protocol"` // http/https/socks5
-	Host      string         `gorm:"size:255;not null" json:"host"`
-	Port      int            `gorm:"not null" json:"port"`
-	Username  string         `gorm:"size:100" json:"username"`
-	Password  string         `gorm:"size:100" json:"-"`
-	Status    string         `gorm:"size:20;default:active;not null" json:"status"` // active/disabled
-	CreatedAt time.Time      `gorm:"not null" json:"created_at"`
-	UpdatedAt time.Time      `gorm:"not null" json:"updated_at"`
-	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
-}
-
-func (Proxy) TableName() string {
-	return "proxies"
-}
-
-// IsActive 检查是否激活
-func (p *Proxy) IsActive() bool {
-	return p.Status == "active"
-}
-
-// URL 返回代理URL
-func (p *Proxy) URL() string {
-	if p.Username != "" && p.Password != "" {
-		return fmt.Sprintf("%s://%s:%s@%s:%d", p.Protocol, p.Username, p.Password, p.Host, p.Port)
-	}
-	return fmt.Sprintf("%s://%s:%d", p.Protocol, p.Host, p.Port)
-}
-
-// ProxyWithAccountCount extends Proxy with account count information
-type ProxyWithAccountCount struct {
-	Proxy
-	AccountCount int64 `json:"account_count"`
-}
--- a/backend/internal/model/redeem_code.go
+++ b/backend/internal/model/redeem_code.go
@@ -1,50 +0,0 @@
-package model
-
-import (
-	"crypto/rand"
-	"encoding/hex"
-	"time"
-)
-
-type RedeemCode struct {
-	ID        int64      `gorm:"primaryKey" json:"id"`
-	Code      string     `gorm:"uniqueIndex;size:32;not null" json:"code"`
-	Type      string     `gorm:"size:20;default:balance;not null" json:"type"`  // balance/concurrency/subscription
-	Value     float64    `gorm:"type:decimal(20,8);not null" json:"value"`      // 面值(USD)或并发数或有效天数
-	Status    string     `gorm:"size:20;default:unused;not null" json:"status"` // unused/used
-	UsedBy    *int64     `gorm:"index" json:"used_by"`
-	UsedAt    *time.Time `json:"used_at"`
-	Notes     string     `gorm:"type:text" json:"notes"`
-	CreatedAt time.Time  `gorm:"not null" json:"created_at"`
-
-	// 订阅类型专用字段
-	GroupID      *int64 `gorm:"index" json:"group_id"`           // 订阅分组ID (仅subscription类型使用)
-	ValidityDays int    `gorm:"default:30" json:"validity_days"` // 订阅有效天数 (仅subscription类型使用)
-
-	// 关联
-	User  *User  `gorm:"foreignKey:UsedBy" json:"user,omitempty"`
-	Group *Group `gorm:"foreignKey:GroupID" json:"group,omitempty"`
-}
-
-func (RedeemCode) TableName() string {
-	return "redeem_codes"
-}
-
-// IsUsed 检查是否已使用
-func (r *RedeemCode) IsUsed() bool {
-	return r.Status == "used"
-}
-
-// CanUse 检查是否可以使用
-func (r *RedeemCode) CanUse() bool {
-	return r.Status == "unused"
-}
-
-// GenerateRedeemCode 生成唯一的兑换码
-func GenerateRedeemCode() (string, error) {
-	b := make([]byte, 16)
-	if _, err := rand.Read(b); err != nil {
-		return "", err
-	}
-	return hex.EncodeToString(b), nil
-}
--- a/backend/internal/model/setting.go
+++ b/backend/internal/model/setting.go
@@ -1,104 +0,0 @@
-package model
-
-import (
-	"time"
-)
-
-// Setting 系统设置模型（Key-Value存储）
-type Setting struct {
-	ID        int64     `gorm:"primaryKey" json:"id"`
-	Key       string    `gorm:"uniqueIndex;size:100;not null" json:"key"`
-	Value     string    `gorm:"type:text;not null" json:"value"`
-	UpdatedAt time.Time `gorm:"not null" json:"updated_at"`
-}
-
-func (Setting) TableName() string {
-	return "settings"
-}
-
-// 设置Key常量
-const (
-	// 注册设置
-	SettingKeyRegistrationEnabled = "registration_enabled" // 是否开放注册
-	SettingKeyEmailVerifyEnabled  = "email_verify_enabled" // 是否开启邮件验证
-
-	// 邮件服务设置
-	SettingKeySmtpHost     = "smtp_host"      // SMTP服务器地址
-	SettingKeySmtpPort     = "smtp_port"      // SMTP端口
-	SettingKeySmtpUsername = "smtp_username"  // SMTP用户名
-	SettingKeySmtpPassword = "smtp_password"  // SMTP密码（加密存储）
-	SettingKeySmtpFrom     = "smtp_from"      // 发件人地址
-	SettingKeySmtpFromName = "smtp_from_name" // 发件人名称
-	SettingKeySmtpUseTLS   = "smtp_use_tls"   // 是否使用TLS
-
-	// Cloudflare Turnstile 设置
-	SettingKeyTurnstileEnabled   = "turnstile_enabled"    // 是否启用 Turnstile 验证
-	SettingKeyTurnstileSiteKey   = "turnstile_site_key"   // Turnstile Site Key
-	SettingKeyTurnstileSecretKey = "turnstile_secret_key" // Turnstile Secret Key
-
-	// OEM设置
-	SettingKeySiteName     = "site_name"     // 网站名称
-	SettingKeySiteLogo     = "site_logo"     // 网站Logo (base64)
-	SettingKeySiteSubtitle = "site_subtitle" // 网站副标题
-	SettingKeyApiBaseUrl   = "api_base_url"  // API端点地址（用于客户端配置和导入）
-	SettingKeyContactInfo  = "contact_info"  // 客服联系方式
-	SettingKeyDocUrl       = "doc_url"       // 文档链接
-
-	// 默认配置
-	SettingKeyDefaultConcurrency = "default_concurrency" // 新用户默认并发量
-	SettingKeyDefaultBalance     = "default_balance"     // 新用户默认余额
-
-	// 管理员 API Key
-	SettingKeyAdminApiKey = "admin_api_key" // 全局管理员 API Key（用于外部系统集成）
-)
-
-// 管理员 API Key 前缀（与用户 sk- 前缀区分）
-const AdminApiKeyPrefix = "admin-"
-
-// SystemSettings 系统设置结构体（用于API响应）
-type SystemSettings struct {
-	// 注册设置
-	RegistrationEnabled bool `json:"registration_enabled"`
-	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
-
-	// 邮件服务设置
-	SmtpHost     string `json:"smtp_host"`
-	SmtpPort     int    `json:"smtp_port"`
-	SmtpUsername string `json:"smtp_username"`
-	SmtpPassword string `json:"smtp_password,omitempty"` // 不返回明文密码
-	SmtpFrom     string `json:"smtp_from_email"`
-	SmtpFromName string `json:"smtp_from_name"`
-	SmtpUseTLS   bool   `json:"smtp_use_tls"`
-
-	// Cloudflare Turnstile 设置
-	TurnstileEnabled   bool   `json:"turnstile_enabled"`
-	TurnstileSiteKey   string `json:"turnstile_site_key"`
-	TurnstileSecretKey string `json:"turnstile_secret_key,omitempty"` // 不返回明文密钥
-
-	// OEM设置
-	SiteName     string `json:"site_name"`
-	SiteLogo     string `json:"site_logo"`
-	SiteSubtitle string `json:"site_subtitle"`
-	ApiBaseUrl   string `json:"api_base_url"`
-	ContactInfo  string `json:"contact_info"`
-	DocUrl       string `json:"doc_url"`
-
-	// 默认配置
-	DefaultConcurrency int     `json:"default_concurrency"`
-	DefaultBalance     float64 `json:"default_balance"`
-}
-
-// PublicSettings 公开设置（无需登录即可获取）
-type PublicSettings struct {
-	RegistrationEnabled bool   `json:"registration_enabled"`
-	EmailVerifyEnabled  bool   `json:"email_verify_enabled"`
-	TurnstileEnabled    bool   `json:"turnstile_enabled"`
-	TurnstileSiteKey    string `json:"turnstile_site_key"`
-	SiteName            string `json:"site_name"`
-	SiteLogo            string `json:"site_logo"`
-	SiteSubtitle        string `json:"site_subtitle"`
-	ApiBaseUrl          string `json:"api_base_url"`
-	ContactInfo         string `json:"contact_info"`
-	DocUrl              string `json:"doc_url"`
-	Version             string `json:"version"`
-}
--- a/backend/internal/model/usage_log.go
+++ b/backend/internal/model/usage_log.go
@@ -1,67 +0,0 @@
-package model
-
-import (
-	"time"
-)
-
-// 消费类型常量
-const (
-	BillingTypeBalance      int8 = 0 // 钱包余额
-	BillingTypeSubscription int8 = 1 // 订阅套餐
-)
-
-type UsageLog struct {
-	ID        int64  `gorm:"primaryKey" json:"id"`
-	UserID    int64  `gorm:"index;not null" json:"user_id"`
-	ApiKeyID  int64  `gorm:"index;not null" json:"api_key_id"`
-	AccountID int64  `gorm:"index;not null" json:"account_id"`
-	RequestID string `gorm:"size:64" json:"request_id"`
-	Model     string `gorm:"size:100;index;not null" json:"model"`
-
-	// 订阅关联（可选）
-	GroupID        *int64 `gorm:"index" json:"group_id"`
-	SubscriptionID *int64 `gorm:"index" json:"subscription_id"`
-
-	// Token使用量（4类）
-	InputTokens         int `gorm:"default:0;not null" json:"input_tokens"`
-	OutputTokens        int `gorm:"default:0;not null" json:"output_tokens"`
-	CacheCreationTokens int `gorm:"default:0;not null" json:"cache_creation_tokens"`
-	CacheReadTokens     int `gorm:"default:0;not null" json:"cache_read_tokens"`
-
-	// 详细的缓存创建分类
-	CacheCreation5mTokens int `gorm:"default:0;not null" json:"cache_creation_5m_tokens"`
-	CacheCreation1hTokens int `gorm:"default:0;not null" json:"cache_creation_1h_tokens"`
-
-	// 费用（USD）
-	InputCost         float64 `gorm:"type:decimal(20,10);default:0;not null" json:"input_cost"`
-	OutputCost        float64 `gorm:"type:decimal(20,10);default:0;not null" json:"output_cost"`
-	CacheCreationCost float64 `gorm:"type:decimal(20,10);default:0;not null" json:"cache_creation_cost"`
-	CacheReadCost     float64 `gorm:"type:decimal(20,10);default:0;not null" json:"cache_read_cost"`
-	TotalCost         float64 `gorm:"type:decimal(20,10);default:0;not null" json:"total_cost"`     // 原始总费用
-	ActualCost        float64 `gorm:"type:decimal(20,10);default:0;not null" json:"actual_cost"`    // 实际扣除费用
-	RateMultiplier    float64 `gorm:"type:decimal(10,4);default:1;not null" json:"rate_multiplier"` // 计费倍率
-
-	// 元数据
-	BillingType  int8 `gorm:"type:smallint;default:0;not null" json:"billing_type"` // 0=余额 1=订阅
-	Stream       bool `gorm:"default:false;not null" json:"stream"`
-	DurationMs   *int `json:"duration_ms"`
-	FirstTokenMs *int `json:"first_token_ms"` // 首字时间（流式请求）
-
-	CreatedAt time.Time `gorm:"index;not null" json:"created_at"`
-
-	// 关联
-	User         *User             `gorm:"foreignKey:UserID" json:"user,omitempty"`
-	ApiKey       *ApiKey           `gorm:"foreignKey:ApiKeyID" json:"api_key,omitempty"`
-	Account      *Account          `gorm:"foreignKey:AccountID" json:"account,omitempty"`
-	Group        *Group            `gorm:"foreignKey:GroupID" json:"group,omitempty"`
-	Subscription *UserSubscription `gorm:"foreignKey:SubscriptionID" json:"subscription,omitempty"`
-}
-
-func (UsageLog) TableName() string {
-	return "usage_logs"
-}
-
-// TotalTokens 总token数
-func (u *UsageLog) TotalTokens() int {
-	return u.InputTokens + u.OutputTokens + u.CacheCreationTokens + u.CacheReadTokens
-}
--- a/backend/internal/model/user.go
+++ b/backend/internal/model/user.go
@@ -1,78 +0,0 @@
-package model
-
-import (
-	"time"
-
-	"github.com/lib/pq"
-	"golang.org/x/crypto/bcrypt"
-	"gorm.io/gorm"
-)
-
-type User struct {
-	ID            int64          `gorm:"primaryKey" json:"id"`
-	Email         string         `gorm:"uniqueIndex;size:255;not null" json:"email"`
-	Username      string         `gorm:"size:100;default:''" json:"username"`
-	Wechat        string         `gorm:"size:100;default:''" json:"wechat"`
-	Notes         string         `gorm:"type:text;default:''" json:"notes"`
-	PasswordHash  string         `gorm:"size:255;not null" json:"-"`
-	Role          string         `gorm:"size:20;default:user;not null" json:"role"` // admin/user
-	Balance       float64        `gorm:"type:decimal(20,8);default:0;not null" json:"balance"`
-	Concurrency   int            `gorm:"default:5;not null" json:"concurrency"`
-	Status        string         `gorm:"size:20;default:active;not null" json:"status"` // active/disabled
-	AllowedGroups pq.Int64Array  `gorm:"type:bigint[]" json:"allowed_groups"`
-	CreatedAt     time.Time      `gorm:"not null" json:"created_at"`
-	UpdatedAt     time.Time      `gorm:"not null" json:"updated_at"`
-	DeletedAt     gorm.DeletedAt `gorm:"index" json:"-"`
-
-	// 关联
-	ApiKeys       []ApiKey           `gorm:"foreignKey:UserID" json:"api_keys,omitempty"`
-	Subscriptions []UserSubscription `gorm:"foreignKey:UserID" json:"subscriptions,omitempty"`
-}
-
-func (User) TableName() string {
-	return "users"
-}
-
-// IsAdmin 检查是否管理员
-func (u *User) IsAdmin() bool {
-	return u.Role == "admin"
-}
-
-// IsActive 检查是否激活
-func (u *User) IsActive() bool {
-	return u.Status == "active"
-}
-
-// CanBindGroup 检查是否可以绑定指定分组
-// 对于标准类型分组：
-// - 如果 AllowedGroups 设置了值（非空数组），只能绑定列表中的分组
-// - 如果 AllowedGroups 为 nil 或空数组，可以绑定所有非专属分组
-func (u *User) CanBindGroup(groupID int64, isExclusive bool) bool {
-	// 如果设置了 allowed_groups 且不为空，只能绑定指定的分组
-	if len(u.AllowedGroups) > 0 {
-		for _, id := range u.AllowedGroups {
-			if id == groupID {
-				return true
-			}
-		}
-		return false
-	}
-	// 如果没有设置 allowed_groups 或为空数组，可以绑定所有非专属分组
-	return !isExclusive
-}
-
-// SetPassword 设置密码（哈希存储）
-func (u *User) SetPassword(password string) error {
-	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
-	if err != nil {
-		return err
-	}
-	u.PasswordHash = string(hash)
-	return nil
-}
-
-// CheckPassword 验证密码
-func (u *User) CheckPassword(password string) bool {
-	err := bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password))
-	return err == nil
-}
--- a/backend/internal/model/user_subscription.go
+++ b/backend/internal/model/user_subscription.go
@@ -1,157 +0,0 @@
-package model
-
-import (
-	"time"
-)
-
-// 订阅状态常量
-const (
-	SubscriptionStatusActive    = "active"
-	SubscriptionStatusExpired   = "expired"
-	SubscriptionStatusSuspended = "suspended"
-)
-
-// UserSubscription 用户订阅模型
-type UserSubscription struct {
-	ID      int64 `gorm:"primaryKey" json:"id"`
-	UserID  int64 `gorm:"index;not null" json:"user_id"`
-	GroupID int64 `gorm:"index;not null" json:"group_id"`
-
-	// 订阅有效期
-	StartsAt  time.Time `gorm:"not null" json:"starts_at"`
-	ExpiresAt time.Time `gorm:"not null" json:"expires_at"`
-	Status    string    `gorm:"size:20;default:active;not null" json:"status"` // active/expired/suspended
-
-	// 滑动窗口起始时间（nil = 未激活）
-	DailyWindowStart   *time.Time `json:"daily_window_start"`
-	WeeklyWindowStart  *time.Time `json:"weekly_window_start"`
-	MonthlyWindowStart *time.Time `json:"monthly_window_start"`
-
-	// 当前窗口已用额度（USD，基于 total_cost 计算）
-	DailyUsageUSD   float64 `gorm:"type:decimal(20,10);default:0;not null" json:"daily_usage_usd"`
-	WeeklyUsageUSD  float64 `gorm:"type:decimal(20,10);default:0;not null" json:"weekly_usage_usd"`
-	MonthlyUsageUSD float64 `gorm:"type:decimal(20,10);default:0;not null" json:"monthly_usage_usd"`
-
-	// 管理员分配信息
-	AssignedBy *int64    `gorm:"index" json:"assigned_by"`
-	AssignedAt time.Time `gorm:"not null" json:"assigned_at"`
-	Notes      string    `gorm:"type:text" json:"notes"`
-
-	CreatedAt time.Time `gorm:"not null" json:"created_at"`
-	UpdatedAt time.Time `gorm:"not null" json:"updated_at"`
-
-	// 关联
-	User           *User  `gorm:"foreignKey:UserID" json:"user,omitempty"`
-	Group          *Group `gorm:"foreignKey:GroupID" json:"group,omitempty"`
-	AssignedByUser *User  `gorm:"foreignKey:AssignedBy" json:"assigned_by_user,omitempty"`
-}
-
-func (UserSubscription) TableName() string {
-	return "user_subscriptions"
-}
-
-// IsActive 检查订阅是否有效（状态为active且未过期）
-func (s *UserSubscription) IsActive() bool {
-	return s.Status == SubscriptionStatusActive && time.Now().Before(s.ExpiresAt)
-}
-
-// IsExpired 检查订阅是否已过期
-func (s *UserSubscription) IsExpired() bool {
-	return time.Now().After(s.ExpiresAt)
-}
-
-// DaysRemaining 返回订阅剩余天数
-func (s *UserSubscription) DaysRemaining() int {
-	if s.IsExpired() {
-		return 0
-	}
-	return int(time.Until(s.ExpiresAt).Hours() / 24)
-}
-
-// IsWindowActivated 检查窗口是否已激活
-func (s *UserSubscription) IsWindowActivated() bool {
-	return s.DailyWindowStart != nil || s.WeeklyWindowStart != nil || s.MonthlyWindowStart != nil
-}
-
-// NeedsDailyReset 检查日窗口是否需要重置
-func (s *UserSubscription) NeedsDailyReset() bool {
-	if s.DailyWindowStart == nil {
-		return false
-	}
-	return time.Since(*s.DailyWindowStart) >= 24*time.Hour
-}
-
-// NeedsWeeklyReset 检查周窗口是否需要重置
-func (s *UserSubscription) NeedsWeeklyReset() bool {
-	if s.WeeklyWindowStart == nil {
-		return false
-	}
-	return time.Since(*s.WeeklyWindowStart) >= 7*24*time.Hour
-}
-
-// NeedsMonthlyReset 检查月窗口是否需要重置
-func (s *UserSubscription) NeedsMonthlyReset() bool {
-	if s.MonthlyWindowStart == nil {
-		return false
-	}
-	return time.Since(*s.MonthlyWindowStart) >= 30*24*time.Hour
-}
-
-// DailyResetTime 返回日窗口重置时间
-func (s *UserSubscription) DailyResetTime() *time.Time {
-	if s.DailyWindowStart == nil {
-		return nil
-	}
-	t := s.DailyWindowStart.Add(24 * time.Hour)
-	return &t
-}
-
-// WeeklyResetTime 返回周窗口重置时间
-func (s *UserSubscription) WeeklyResetTime() *time.Time {
-	if s.WeeklyWindowStart == nil {
-		return nil
-	}
-	t := s.WeeklyWindowStart.Add(7 * 24 * time.Hour)
-	return &t
-}
-
-// MonthlyResetTime 返回月窗口重置时间
-func (s *UserSubscription) MonthlyResetTime() *time.Time {
-	if s.MonthlyWindowStart == nil {
-		return nil
-	}
-	t := s.MonthlyWindowStart.Add(30 * 24 * time.Hour)
-	return &t
-}
-
-// CheckDailyLimit 检查是否超出日限额
-func (s *UserSubscription) CheckDailyLimit(group *Group, additionalCost float64) bool {
-	if !group.HasDailyLimit() {
-		return true // 无限制
-	}
-	return s.DailyUsageUSD+additionalCost <= *group.DailyLimitUSD
-}
-
-// CheckWeeklyLimit 检查是否超出周限额
-func (s *UserSubscription) CheckWeeklyLimit(group *Group, additionalCost float64) bool {
-	if !group.HasWeeklyLimit() {
-		return true // 无限制
-	}
-	return s.WeeklyUsageUSD+additionalCost <= *group.WeeklyLimitUSD
-}
-
-// CheckMonthlyLimit 检查是否超出月限额
-func (s *UserSubscription) CheckMonthlyLimit(group *Group, additionalCost float64) bool {
-	if !group.HasMonthlyLimit() {
-		return true // 无限制
-	}
-	return s.MonthlyUsageUSD+additionalCost <= *group.MonthlyLimitUSD
-}
-
-// CheckAllLimits 检查所有限额
-func (s *UserSubscription) CheckAllLimits(group *Group, additionalCost float64) (daily, weekly, monthly bool) {
-	daily = s.CheckDailyLimit(group, additionalCost)
-	weekly = s.CheckWeeklyLimit(group, additionalCost)
-	monthly = s.CheckMonthlyLimit(group, additionalCost)
-	return
-}
--- a/backend/internal/repository/account_repo.go
+++ b/backend/internal/repository/account_repo.go
@@ -5,10 +5,10 @@ import (
 	"errors"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/service"

+	"gorm.io/datatypes"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
 )
@@ -21,69 +21,66 @@ func NewAccountRepository(db *gorm.DB) service.AccountRepository {
 	return &accountRepository{db: db}
 }

-func (r *accountRepository) Create(ctx context.Context, account *model.Account) error {
-	return r.db.WithContext(ctx).Create(account).Error
+func (r *accountRepository) Create(ctx context.Context, account *service.Account) error {
+	m := accountModelFromService(account)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyAccountModelToService(account, m)
+	}
+	return err
 }

-func (r *accountRepository) GetByID(ctx context.Context, id int64) (*model.Account, error) {
-	var account model.Account
-	err := r.db.WithContext(ctx).Preload("Proxy").Preload("AccountGroups.Group").First(&account, id).Error
+func (r *accountRepository) GetByID(ctx context.Context, id int64) (*service.Account, error) {
+	var m accountModel
+	err := r.db.WithContext(ctx).Preload("Proxy").Preload("AccountGroups.Group").First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrAccountNotFound, nil)
 	}
-	// 填充 GroupIDs 和 Groups 虚拟字段
-	account.GroupIDs = make([]int64, 0, len(account.AccountGroups))
-	account.Groups = make([]*model.Group, 0, len(account.AccountGroups))
-	for _, ag := range account.AccountGroups {
-		account.GroupIDs = append(account.GroupIDs, ag.GroupID)
-		if ag.Group != nil {
-			account.Groups = append(account.Groups, ag.Group)
-		}
-	}
-	return &account, nil
+	return accountModelToService(&m), nil
 }

-func (r *accountRepository) GetByCRSAccountID(ctx context.Context, crsAccountID string) (*model.Account, error) {
+func (r *accountRepository) GetByCRSAccountID(ctx context.Context, crsAccountID string) (*service.Account, error) {
 	if crsAccountID == "" {
 		return nil, nil
 	}

-	var account model.Account
-	err := r.db.WithContext(ctx).Where("extra->>'crs_account_id' = ?", crsAccountID).First(&account).Error
+	var m accountModel
+	err := r.db.WithContext(ctx).Where("extra->>'crs_account_id' = ?", crsAccountID).First(&m).Error
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
 			return nil, nil
 		}
 		return nil, err
 	}
-	return &account, nil
+	return accountModelToService(&m), nil
 }

-func (r *accountRepository) Update(ctx context.Context, account *model.Account) error {
-	return r.db.WithContext(ctx).Save(account).Error
+func (r *accountRepository) Update(ctx context.Context, account *service.Account) error {
+	m := accountModelFromService(account)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyAccountModelToService(account, m)
+	}
+	return err
 }

 func (r *accountRepository) Delete(ctx context.Context, id int64) error {
-	// 先删除账号与分组的绑定关系
-	if err := r.db.WithContext(ctx).Where("account_id = ?", id).Delete(&model.AccountGroup{}).Error; err != nil {
+	if err := r.db.WithContext(ctx).Where("account_id = ?", id).Delete(&accountGroupModel{}).Error; err != nil {
 		return err
 	}
-	// 再删除账号
-	return r.db.WithContext(ctx).Delete(&model.Account{}, id).Error
+	return r.db.WithContext(ctx).Delete(&accountModel{}, id).Error
 }

-func (r *accountRepository) List(ctx context.Context, params pagination.PaginationParams) ([]model.Account, *pagination.PaginationResult, error) {
+func (r *accountRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.Account, *pagination.PaginationResult, error) {
 	return r.ListWithFilters(ctx, params, "", "", "", "")
 }

-// ListWithFilters lists accounts with optional filtering by platform, type, status, and search query
-func (r *accountRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, accountType, status, search string) ([]model.Account, *pagination.PaginationResult, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, accountType, status, search string) ([]service.Account, *pagination.PaginationResult, error) {
+	var accounts []accountModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.Account{})
+	db := r.db.WithContext(ctx).Model(&accountModel{})

-	// Apply filters
 	if platform != "" {
 		db = db.Where("platform = ?", platform)
 	}
@@ -106,67 +103,84 @@ func (r *accountRepository) ListWithFilters(ctx context.Context, params paginati
 		return nil, nil, err
 	}

-	// 填充每个 Account 的虚拟字段（GroupIDs 和 Groups）
+	outAccounts := make([]service.Account, 0, len(accounts))
 	for i := range accounts {
-		accounts[i].GroupIDs = make([]int64, 0, len(accounts[i].AccountGroups))
-		accounts[i].Groups = make([]*model.Group, 0, len(accounts[i].AccountGroups))
-		for _, ag := range accounts[i].AccountGroups {
-			accounts[i].GroupIDs = append(accounts[i].GroupIDs, ag.GroupID)
-			if ag.Group != nil {
-				accounts[i].Groups = append(accounts[i].Groups, ag.Group)
-			}
-		}
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return accounts, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outAccounts, paginationResultFromTotal(total, params), nil
 }

-func (r *accountRepository) ListByGroup(ctx context.Context, groupID int64) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListByGroup(ctx context.Context, groupID int64) ([]service.Account, error) {
+	var accounts []accountModel
 	err := r.db.WithContext(ctx).
 		Joins("JOIN account_groups ON account_groups.account_id = accounts.id").
-		Where("account_groups.group_id = ? AND accounts.status = ?", groupID, model.StatusActive).
+		Where("account_groups.group_id = ? AND accounts.status = ?", groupID, service.StatusActive).
 		Preload("Proxy").
 		Order("account_groups.priority ASC, accounts.priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

-func (r *accountRepository) ListActive(ctx context.Context) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListActive(ctx context.Context) ([]service.Account, error) {
+	var accounts []accountModel
 	err := r.db.WithContext(ctx).
-		Where("status = ?", model.StatusActive).
+		Where("status = ?", service.StatusActive).
 		Preload("Proxy").
 		Order("priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
+}
+
+func (r *accountRepository) ListByPlatform(ctx context.Context, platform string) ([]service.Account, error) {
+	var accounts []accountModel
+	err := r.db.WithContext(ctx).
+		Where("platform = ? AND status = ?", platform, service.StatusActive).
+		Preload("Proxy").
+		Order("priority ASC").
+		Find(&accounts).Error
+	if err != nil {
+		return nil, err
+	}
+
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

 func (r *accountRepository) UpdateLastUsed(ctx context.Context, id int64) error {
 	now := time.Now()
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).Update("last_used_at", now).Error
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).Update("last_used_at", now).Error
 }

 func (r *accountRepository) SetError(ctx context.Context, id int64, errorMsg string) error {
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Updates(map[string]any{
-			"status":        model.StatusError,
+			"status":        service.StatusError,
 			"error_message": errorMsg,
 		}).Error
 }

 func (r *accountRepository) AddToGroup(ctx context.Context, accountID, groupID int64, priority int) error {
-	ag := &model.AccountGroup{
+	ag := &accountGroupModel{
 		AccountID: accountID,
 		GroupID:   groupID,
 		Priority:  priority,
@@ -176,131 +190,148 @@ func (r *accountRepository) AddToGroup(ctx context.Context, accountID, groupID i

 func (r *accountRepository) RemoveFromGroup(ctx context.Context, accountID, groupID int64) error {
 	return r.db.WithContext(ctx).Where("account_id = ? AND group_id = ?", accountID, groupID).
-		Delete(&model.AccountGroup{}).Error
+		Delete(&accountGroupModel{}).Error
 }

-func (r *accountRepository) GetGroups(ctx context.Context, accountID int64) ([]model.Group, error) {
-	var groups []model.Group
+func (r *accountRepository) GetGroups(ctx context.Context, accountID int64) ([]service.Group, error) {
+	var groups []groupModel
 	err := r.db.WithContext(ctx).
 		Joins("JOIN account_groups ON account_groups.group_id = groups.id").
 		Where("account_groups.account_id = ?", accountID).
 		Find(&groups).Error
-	return groups, err
-}
+	if err != nil {
+		return nil, err
+	}

-func (r *accountRepository) ListByPlatform(ctx context.Context, platform string) ([]model.Account, error) {
-	var accounts []model.Account
-	err := r.db.WithContext(ctx).
-		Where("platform = ? AND status = ?", platform, model.StatusActive).
-		Preload("Proxy").
-		Order("priority ASC").
-		Find(&accounts).Error
-	return accounts, err
+	outGroups := make([]service.Group, 0, len(groups))
+	for i := range groups {
+		outGroups = append(outGroups, *groupModelToService(&groups[i]))
+	}
+	return outGroups, nil
 }

 func (r *accountRepository) BindGroups(ctx context.Context, accountID int64, groupIDs []int64) error {
-	// 删除现有绑定
-	if err := r.db.WithContext(ctx).Where("account_id = ?", accountID).Delete(&model.AccountGroup{}).Error; err != nil {
+	if err := r.db.WithContext(ctx).Where("account_id = ?", accountID).Delete(&accountGroupModel{}).Error; err != nil {
 		return err
 	}

-	// 添加新绑定
-	if len(groupIDs) > 0 {
-		accountGroups := make([]model.AccountGroup, 0, len(groupIDs))
-		for i, groupID := range groupIDs {
-			accountGroups = append(accountGroups, model.AccountGroup{
-				AccountID: accountID,
-				GroupID:   groupID,
-				Priority:  i + 1, // 使用索引作为优先级
-			})
-		}
-		return r.db.WithContext(ctx).Create(&accountGroups).Error
+	if len(groupIDs) == 0 {
+		return nil
 	}

-	return nil
+	accountGroups := make([]accountGroupModel, 0, len(groupIDs))
+	for i, groupID := range groupIDs {
+		accountGroups = append(accountGroups, accountGroupModel{
+			AccountID: accountID,
+			GroupID:   groupID,
+			Priority:  i + 1,
+		})
+	}
+	return r.db.WithContext(ctx).Create(&accountGroups).Error
 }

-// ListSchedulable 获取所有可调度的账号
-func (r *accountRepository) ListSchedulable(ctx context.Context) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListSchedulable(ctx context.Context) ([]service.Account, error) {
+	var accounts []accountModel
 	now := time.Now()
 	err := r.db.WithContext(ctx).
-		Where("status = ? AND schedulable = ?", model.StatusActive, true).
+		Where("status = ? AND schedulable = ?", service.StatusActive, true).
 		Where("(overload_until IS NULL OR overload_until <= ?)", now).
 		Where("(rate_limit_reset_at IS NULL OR rate_limit_reset_at <= ?)", now).
 		Preload("Proxy").
 		Order("priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

-// ListSchedulableByGroupID 按组获取可调度的账号
-func (r *accountRepository) ListSchedulableByGroupID(ctx context.Context, groupID int64) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListSchedulableByGroupID(ctx context.Context, groupID int64) ([]service.Account, error) {
+	var accounts []accountModel
 	now := time.Now()
 	err := r.db.WithContext(ctx).
 		Joins("JOIN account_groups ON account_groups.account_id = accounts.id").
 		Where("account_groups.group_id = ?", groupID).
-		Where("accounts.status = ? AND accounts.schedulable = ?", model.StatusActive, true).
+		Where("accounts.status = ? AND accounts.schedulable = ?", service.StatusActive, true).
 		Where("(accounts.overload_until IS NULL OR accounts.overload_until <= ?)", now).
 		Where("(accounts.rate_limit_reset_at IS NULL OR accounts.rate_limit_reset_at <= ?)", now).
 		Preload("Proxy").
 		Order("account_groups.priority ASC, accounts.priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

-// ListSchedulableByPlatform 按平台获取可调度的账号
-func (r *accountRepository) ListSchedulableByPlatform(ctx context.Context, platform string) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListSchedulableByPlatform(ctx context.Context, platform string) ([]service.Account, error) {
+	var accounts []accountModel
 	now := time.Now()
 	err := r.db.WithContext(ctx).
 		Where("platform = ?", platform).
-		Where("status = ? AND schedulable = ?", model.StatusActive, true).
+		Where("status = ? AND schedulable = ?", service.StatusActive, true).
 		Where("(overload_until IS NULL OR overload_until <= ?)", now).
 		Where("(rate_limit_reset_at IS NULL OR rate_limit_reset_at <= ?)", now).
 		Preload("Proxy").
 		Order("priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

-// ListSchedulableByGroupIDAndPlatform 按组和平台获取可调度的账号
-func (r *accountRepository) ListSchedulableByGroupIDAndPlatform(ctx context.Context, groupID int64, platform string) ([]model.Account, error) {
-	var accounts []model.Account
+func (r *accountRepository) ListSchedulableByGroupIDAndPlatform(ctx context.Context, groupID int64, platform string) ([]service.Account, error) {
+	var accounts []accountModel
 	now := time.Now()
 	err := r.db.WithContext(ctx).
 		Joins("JOIN account_groups ON account_groups.account_id = accounts.id").
 		Where("account_groups.group_id = ?", groupID).
 		Where("accounts.platform = ?", platform).
-		Where("accounts.status = ? AND accounts.schedulable = ?", model.StatusActive, true).
+		Where("accounts.status = ? AND accounts.schedulable = ?", service.StatusActive, true).
 		Where("(accounts.overload_until IS NULL OR accounts.overload_until <= ?)", now).
 		Where("(accounts.rate_limit_reset_at IS NULL OR accounts.rate_limit_reset_at <= ?)", now).
 		Preload("Proxy").
 		Order("account_groups.priority ASC, accounts.priority ASC").
 		Find(&accounts).Error
-	return accounts, err
+	if err != nil {
+		return nil, err
+	}
+	outAccounts := make([]service.Account, 0, len(accounts))
+	for i := range accounts {
+		outAccounts = append(outAccounts, *accountModelToService(&accounts[i]))
+	}
+	return outAccounts, nil
 }

-// SetRateLimited 标记账号为限流状态(429)
 func (r *accountRepository) SetRateLimited(ctx context.Context, id int64, resetAt time.Time) error {
 	now := time.Now()
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Updates(map[string]any{
 			"rate_limited_at":     now,
 			"rate_limit_reset_at": resetAt,
 		}).Error
 }

-// SetOverloaded 标记账号为过载状态(529)
 func (r *accountRepository) SetOverloaded(ctx context.Context, id int64, until time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Update("overload_until", until).Error
 }

-// ClearRateLimit 清除账号的限流状态
 func (r *accountRepository) ClearRateLimit(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Updates(map[string]any{
 			"rate_limited_at":     nil,
 			"rate_limit_reset_at": nil,
@@ -308,7 +339,6 @@ func (r *accountRepository) ClearRateLimit(ctx context.Context, id int64) error
 		}).Error
 }

-// UpdateSessionWindow 更新账号的5小时时间窗口信息
 func (r *accountRepository) UpdateSessionWindow(ctx context.Context, id int64, start, end *time.Time, status string) error {
 	updates := map[string]any{
 		"session_window_status": status,
@@ -319,45 +349,35 @@ func (r *accountRepository) UpdateSessionWindow(ctx context.Context, id int64, s
 	if end != nil {
 		updates["session_window_end"] = end
 	}
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).Updates(updates).Error
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).Updates(updates).Error
 }

-// SetSchedulable 设置账号的调度开关
 func (r *accountRepository) SetSchedulable(ctx context.Context, id int64, schedulable bool) error {
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Update("schedulable", schedulable).Error
 }

-// UpdateExtra updates specific fields in account's Extra JSONB field
-// It merges the updates into existing Extra data without overwriting other fields
 func (r *accountRepository) UpdateExtra(ctx context.Context, id int64, updates map[string]any) error {
 	if len(updates) == 0 {
 		return nil
 	}

-	// Get current account to preserve existing Extra data
-	var account model.Account
+	var account accountModel
 	if err := r.db.WithContext(ctx).Select("extra").Where("id = ?", id).First(&account).Error; err != nil {
 		return err
 	}

-	// Initialize Extra if nil
 	if account.Extra == nil {
-		account.Extra = make(model.JSONB)
+		account.Extra = datatypes.JSONMap{}
 	}
-
-	// Merge updates into existing Extra
 	for k, v := range updates {
 		account.Extra[k] = v
 	}

-	// Save updated Extra
-	return r.db.WithContext(ctx).Model(&model.Account{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&accountModel{}).Where("id = ?", id).
 		Update("extra", account.Extra).Error
 }

-// BulkUpdate updates multiple accounts with the provided fields.
-// It merges credentials/extra JSONB fields instead of overwriting them.
 func (r *accountRepository) BulkUpdate(ctx context.Context, ids []int64, updates service.AccountBulkUpdate) (int64, error) {
 	if len(ids) == 0 {
 		return 0, nil
@@ -381,10 +401,10 @@ func (r *accountRepository) BulkUpdate(ctx context.Context, ids []int64, updates
 		updateMap["status"] = *updates.Status
 	}
 	if len(updates.Credentials) > 0 {
-		updateMap["credentials"] = gorm.Expr("COALESCE(credentials,'{}') || ?", updates.Credentials)
+		updateMap["credentials"] = gorm.Expr("COALESCE(credentials,'{}') || ?", datatypes.JSONMap(updates.Credentials))
 	}
 	if len(updates.Extra) > 0 {
-		updateMap["extra"] = gorm.Expr("COALESCE(extra,'{}') || ?", updates.Extra)
+		updateMap["extra"] = gorm.Expr("COALESCE(extra,'{}') || ?", datatypes.JSONMap(updates.Extra))
 	}

 	if len(updateMap) == 0 {
@@ -392,10 +412,178 @@ func (r *accountRepository) BulkUpdate(ctx context.Context, ids []int64, updates
 	}

 	result := r.db.WithContext(ctx).
-		Model(&model.Account{}).
+		Model(&accountModel{}).
 		Where("id IN ?", ids).
 		Clauses(clause.Returning{}).
 		Updates(updateMap)

 	return result.RowsAffected, result.Error
 }
+
+type accountModel struct {
+	ID           int64             `gorm:"primaryKey"`
+	Name         string            `gorm:"size:100;not null"`
+	Platform     string            `gorm:"size:50;not null"`
+	Type         string            `gorm:"size:20;not null"`
+	Credentials  datatypes.JSONMap `gorm:"type:jsonb;default:'{}'"`
+	Extra        datatypes.JSONMap `gorm:"type:jsonb;default:'{}'"`
+	ProxyID      *int64            `gorm:"index"`
+	Concurrency  int               `gorm:"default:3;not null"`
+	Priority     int               `gorm:"default:50;not null"`
+	Status       string            `gorm:"size:20;default:active;not null"`
+	ErrorMessage string            `gorm:"type:text"`
+	LastUsedAt   *time.Time        `gorm:"index"`
+	CreatedAt    time.Time         `gorm:"not null"`
+	UpdatedAt    time.Time         `gorm:"not null"`
+	DeletedAt    gorm.DeletedAt    `gorm:"index"`
+
+	Schedulable bool `gorm:"default:true;not null"`
+
+	RateLimitedAt    *time.Time `gorm:"index"`
+	RateLimitResetAt *time.Time `gorm:"index"`
+	OverloadUntil    *time.Time `gorm:"index"`
+
+	SessionWindowStart  *time.Time
+	SessionWindowEnd    *time.Time
+	SessionWindowStatus string `gorm:"size:20"`
+
+	Proxy         *proxyModel         `gorm:"foreignKey:ProxyID"`
+	AccountGroups []accountGroupModel `gorm:"foreignKey:AccountID"`
+}
+
+func (accountModel) TableName() string { return "accounts" }
+
+type accountGroupModel struct {
+	AccountID int64     `gorm:"primaryKey"`
+	GroupID   int64     `gorm:"primaryKey"`
+	Priority  int       `gorm:"default:50;not null"`
+	CreatedAt time.Time `gorm:"not null"`
+
+	Account *accountModel `gorm:"foreignKey:AccountID"`
+	Group   *groupModel   `gorm:"foreignKey:GroupID"`
+}
+
+func (accountGroupModel) TableName() string { return "account_groups" }
+
+func accountGroupModelToService(m *accountGroupModel) *service.AccountGroup {
+	if m == nil {
+		return nil
+	}
+	return &service.AccountGroup{
+		AccountID: m.AccountID,
+		GroupID:   m.GroupID,
+		Priority:  m.Priority,
+		CreatedAt: m.CreatedAt,
+		Account:   accountModelToService(m.Account),
+		Group:     groupModelToService(m.Group),
+	}
+}
+
+func accountModelToService(m *accountModel) *service.Account {
+	if m == nil {
+		return nil
+	}
+
+	var credentials map[string]any
+	if m.Credentials != nil {
+		credentials = map[string]any(m.Credentials)
+	}
+
+	var extra map[string]any
+	if m.Extra != nil {
+		extra = map[string]any(m.Extra)
+	}
+
+	account := &service.Account{
+		ID:                  m.ID,
+		Name:                m.Name,
+		Platform:            m.Platform,
+		Type:                m.Type,
+		Credentials:         credentials,
+		Extra:               extra,
+		ProxyID:             m.ProxyID,
+		Concurrency:         m.Concurrency,
+		Priority:            m.Priority,
+		Status:              m.Status,
+		ErrorMessage:        m.ErrorMessage,
+		LastUsedAt:          m.LastUsedAt,
+		CreatedAt:           m.CreatedAt,
+		UpdatedAt:           m.UpdatedAt,
+		Schedulable:         m.Schedulable,
+		RateLimitedAt:       m.RateLimitedAt,
+		RateLimitResetAt:    m.RateLimitResetAt,
+		OverloadUntil:       m.OverloadUntil,
+		SessionWindowStart:  m.SessionWindowStart,
+		SessionWindowEnd:    m.SessionWindowEnd,
+		SessionWindowStatus: m.SessionWindowStatus,
+		Proxy:               proxyModelToService(m.Proxy),
+	}
+
+	if len(m.AccountGroups) > 0 {
+		account.AccountGroups = make([]service.AccountGroup, 0, len(m.AccountGroups))
+		account.GroupIDs = make([]int64, 0, len(m.AccountGroups))
+		account.Groups = make([]*service.Group, 0, len(m.AccountGroups))
+		for i := range m.AccountGroups {
+			ag := accountGroupModelToService(&m.AccountGroups[i])
+			if ag == nil {
+				continue
+			}
+			account.AccountGroups = append(account.AccountGroups, *ag)
+			account.GroupIDs = append(account.GroupIDs, ag.GroupID)
+			if ag.Group != nil {
+				account.Groups = append(account.Groups, ag.Group)
+			}
+		}
+	}
+
+	return account
+}
+
+func accountModelFromService(a *service.Account) *accountModel {
+	if a == nil {
+		return nil
+	}
+
+	var credentials datatypes.JSONMap
+	if a.Credentials != nil {
+		credentials = datatypes.JSONMap(a.Credentials)
+	}
+
+	var extra datatypes.JSONMap
+	if a.Extra != nil {
+		extra = datatypes.JSONMap(a.Extra)
+	}
+
+	return &accountModel{
+		ID:                  a.ID,
+		Name:                a.Name,
+		Platform:            a.Platform,
+		Type:                a.Type,
+		Credentials:         credentials,
+		Extra:               extra,
+		ProxyID:             a.ProxyID,
+		Concurrency:         a.Concurrency,
+		Priority:            a.Priority,
+		Status:              a.Status,
+		ErrorMessage:        a.ErrorMessage,
+		LastUsedAt:          a.LastUsedAt,
+		CreatedAt:           a.CreatedAt,
+		UpdatedAt:           a.UpdatedAt,
+		Schedulable:         a.Schedulable,
+		RateLimitedAt:       a.RateLimitedAt,
+		RateLimitResetAt:    a.RateLimitResetAt,
+		OverloadUntil:       a.OverloadUntil,
+		SessionWindowStart:  a.SessionWindowStart,
+		SessionWindowEnd:    a.SessionWindowEnd,
+		SessionWindowStatus: a.SessionWindowStatus,
+	}
+}
+
+func applyAccountModelToService(account *service.Account, m *accountModel) {
+	if account == nil || m == nil {
+		return
+	}
+	account.ID = m.ID
+	account.CreatedAt = m.CreatedAt
+	account.UpdatedAt = m.UpdatedAt
+}
--- a/backend/internal/repository/account_repo_integration_test.go
+++ b/backend/internal/repository/account_repo_integration_test.go
@@ -7,10 +7,10 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
+	"gorm.io/datatypes"
 	"gorm.io/gorm"
 )

@@ -34,11 +34,16 @@ func TestAccountRepoSuite(t *testing.T) {
 // --- Create / GetByID / Update / Delete ---

 func (s *AccountRepoSuite) TestCreate() {
-	account := &model.Account{
-		Name:     "test-create",
-		Platform: model.PlatformAnthropic,
-		Type:     model.AccountTypeOAuth,
-		Status:   model.StatusActive,
+	account := &service.Account{
+		Name:        "test-create",
+		Platform:    service.PlatformAnthropic,
+		Type:        service.AccountTypeOAuth,
+		Status:      service.StatusActive,
+		Credentials: map[string]any{},
+		Extra:       map[string]any{},
+		Concurrency: 3,
+		Priority:    50,
+		Schedulable: true,
 	}

 	err := s.repo.Create(s.ctx, account)
@@ -56,7 +61,7 @@ func (s *AccountRepoSuite) TestGetByID_NotFound() {
 }

 func (s *AccountRepoSuite) TestUpdate() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "original"})
+	account := accountModelToService(mustCreateAccount(s.T(), s.db, &accountModel{Name: "original"}))

 	account.Name = "updated"
 	err := s.repo.Update(s.ctx, account)
@@ -68,7 +73,7 @@ func (s *AccountRepoSuite) TestUpdate() {
 }

 func (s *AccountRepoSuite) TestDelete() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "to-delete"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "to-delete"})

 	err := s.repo.Delete(s.ctx, account.ID)
 	s.Require().NoError(err, "Delete")
@@ -78,23 +83,23 @@ func (s *AccountRepoSuite) TestDelete() {
 }

 func (s *AccountRepoSuite) TestDelete_WithGroupBindings() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-del"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-del"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-del"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-del"})
 	mustBindAccountToGroup(s.T(), s.db, account.ID, group.ID, 1)

 	err := s.repo.Delete(s.ctx, account.ID)
 	s.Require().NoError(err, "Delete should cascade remove bindings")

 	var count int64
-	s.db.Model(&model.AccountGroup{}).Where("account_id = ?", account.ID).Count(&count)
+	s.db.Model(&accountGroupModel{}).Where("account_id = ?", account.ID).Count(&count)
 	s.Require().Zero(count, "expected bindings to be removed")
 }

 // --- List / ListWithFilters ---

 func (s *AccountRepoSuite) TestList() {
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc1"})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc2"})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc1"})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc2"})

 	accounts, page, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "List")
@@ -111,53 +116,53 @@ func (s *AccountRepoSuite) TestListWithFilters() {
 		status    string
 		search    string
 		wantCount int
-		validate  func(accounts []model.Account)
+		validate  func(accounts []service.Account)
 	}{
 		{
 			name: "filter_by_platform",
 			setup: func(db *gorm.DB) {
-				mustCreateAccount(s.T(), db, &model.Account{Name: "a1", Platform: model.PlatformAnthropic})
-				mustCreateAccount(s.T(), db, &model.Account{Name: "a2", Platform: model.PlatformOpenAI})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "a1", Platform: service.PlatformAnthropic})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "a2", Platform: service.PlatformOpenAI})
 			},
-			platform:  model.PlatformOpenAI,
+			platform:  service.PlatformOpenAI,
 			wantCount: 1,
-			validate: func(accounts []model.Account) {
-				s.Require().Equal(model.PlatformOpenAI, accounts[0].Platform)
+			validate: func(accounts []service.Account) {
+				s.Require().Equal(service.PlatformOpenAI, accounts[0].Platform)
 			},
 		},
 		{
 			name: "filter_by_type",
 			setup: func(db *gorm.DB) {
-				mustCreateAccount(s.T(), db, &model.Account{Name: "t1", Type: model.AccountTypeOAuth})
-				mustCreateAccount(s.T(), db, &model.Account{Name: "t2", Type: model.AccountTypeApiKey})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "t1", Type: service.AccountTypeOAuth})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "t2", Type: service.AccountTypeApiKey})
 			},
-			accType:   model.AccountTypeApiKey,
+			accType:   service.AccountTypeApiKey,
 			wantCount: 1,
-			validate: func(accounts []model.Account) {
-				s.Require().Equal(model.AccountTypeApiKey, accounts[0].Type)
+			validate: func(accounts []service.Account) {
+				s.Require().Equal(service.AccountTypeApiKey, accounts[0].Type)
 			},
 		},
 		{
 			name: "filter_by_status",
 			setup: func(db *gorm.DB) {
-				mustCreateAccount(s.T(), db, &model.Account{Name: "s1", Status: model.StatusActive})
-				mustCreateAccount(s.T(), db, &model.Account{Name: "s2", Status: model.StatusDisabled})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "s1", Status: service.StatusActive})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "s2", Status: service.StatusDisabled})
 			},
-			status:    model.StatusDisabled,
+			status:    service.StatusDisabled,
 			wantCount: 1,
-			validate: func(accounts []model.Account) {
-				s.Require().Equal(model.StatusDisabled, accounts[0].Status)
+			validate: func(accounts []service.Account) {
+				s.Require().Equal(service.StatusDisabled, accounts[0].Status)
 			},
 		},
 		{
 			name: "filter_by_search",
 			setup: func(db *gorm.DB) {
-				mustCreateAccount(s.T(), db, &model.Account{Name: "alpha-account"})
-				mustCreateAccount(s.T(), db, &model.Account{Name: "beta-account"})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "alpha-account"})
+				mustCreateAccount(s.T(), db, &accountModel{Name: "beta-account"})
 			},
 			search:    "alpha",
 			wantCount: 1,
-			validate: func(accounts []model.Account) {
+			validate: func(accounts []service.Account) {
 				s.Require().Contains(accounts[0].Name, "alpha")
 			},
 		},
@@ -185,9 +190,9 @@ func (s *AccountRepoSuite) TestListWithFilters() {
 // --- ListByGroup / ListActive / ListByPlatform ---

 func (s *AccountRepoSuite) TestListByGroup() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-list"})
-	acc1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", Status: model.StatusActive})
-	acc2 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", Status: model.StatusActive})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-list"})
+	acc1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", Status: service.StatusActive})
+	acc2 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", Status: service.StatusActive})
 	mustBindAccountToGroup(s.T(), s.db, acc1.ID, group.ID, 2)
 	mustBindAccountToGroup(s.T(), s.db, acc2.ID, group.ID, 1)

@@ -199,8 +204,8 @@ func (s *AccountRepoSuite) TestListByGroup() {
 }

 func (s *AccountRepoSuite) TestListActive() {
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "active1", Status: model.StatusActive})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "inactive1", Status: model.StatusDisabled})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "active1", Status: service.StatusActive})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "inactive1", Status: service.StatusDisabled})

 	accounts, err := s.repo.ListActive(s.ctx)
 	s.Require().NoError(err, "ListActive")
@@ -209,22 +214,22 @@ func (s *AccountRepoSuite) TestListActive() {
 }

 func (s *AccountRepoSuite) TestListByPlatform() {
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "p1", Platform: model.PlatformAnthropic, Status: model.StatusActive})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "p2", Platform: model.PlatformOpenAI, Status: model.StatusActive})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "p1", Platform: service.PlatformAnthropic, Status: service.StatusActive})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "p2", Platform: service.PlatformOpenAI, Status: service.StatusActive})

-	accounts, err := s.repo.ListByPlatform(s.ctx, model.PlatformAnthropic)
+	accounts, err := s.repo.ListByPlatform(s.ctx, service.PlatformAnthropic)
 	s.Require().NoError(err, "ListByPlatform")
 	s.Require().Len(accounts, 1)
-	s.Require().Equal(model.PlatformAnthropic, accounts[0].Platform)
+	s.Require().Equal(service.PlatformAnthropic, accounts[0].Platform)
 }

 // --- Preload and VirtualFields ---

 func (s *AccountRepoSuite) TestPreload_And_VirtualFields() {
-	proxy := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p1"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1"})
+	proxy := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p1"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1"})

-	account := mustCreateAccount(s.T(), s.db, &model.Account{
+	account := mustCreateAccount(s.T(), s.db, &accountModel{
 		Name:    "acc1",
 		ProxyID: &proxy.ID,
 	})
@@ -252,9 +257,9 @@ func (s *AccountRepoSuite) TestPreload_And_VirtualFields() {
 // --- GroupBinding / AddToGroup / RemoveFromGroup / BindGroups / GetGroups ---

 func (s *AccountRepoSuite) TestGroupBinding_And_BindGroups() {
-	g1 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1"})
-	g2 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc"})
+	g1 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1"})
+	g2 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc"})

 	s.Require().NoError(s.repo.AddToGroup(s.ctx, account.ID, g1.ID, 10), "AddToGroup")
 	groups, err := s.repo.GetGroups(s.ctx, account.ID)
@@ -274,8 +279,8 @@ func (s *AccountRepoSuite) TestGroupBinding_And_BindGroups() {
 }

 func (s *AccountRepoSuite) TestBindGroups_EmptyList() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-empty"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-empty"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-empty"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-empty"})
 	mustBindAccountToGroup(s.T(), s.db, account.ID, group.ID, 1)

 	s.Require().NoError(s.repo.BindGroups(s.ctx, account.ID, []int64{}), "BindGroups empty")
@@ -289,13 +294,13 @@ func (s *AccountRepoSuite) TestBindGroups_EmptyList() {

 func (s *AccountRepoSuite) TestListSchedulable() {
 	now := time.Now()
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-sched"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-sched"})

-	okAcc := mustCreateAccount(s.T(), s.db, &model.Account{Name: "ok", Schedulable: true})
+	okAcc := mustCreateAccount(s.T(), s.db, &accountModel{Name: "ok", Schedulable: true})
 	mustBindAccountToGroup(s.T(), s.db, okAcc.ID, group.ID, 1)

 	future := now.Add(10 * time.Minute)
-	overloaded := mustCreateAccount(s.T(), s.db, &model.Account{Name: "over", Schedulable: true, OverloadUntil: &future})
+	overloaded := mustCreateAccount(s.T(), s.db, &accountModel{Name: "over", Schedulable: true, OverloadUntil: &future})
 	mustBindAccountToGroup(s.T(), s.db, overloaded.ID, group.ID, 1)

 	sched, err := s.repo.ListSchedulable(s.ctx)
@@ -307,16 +312,16 @@ func (s *AccountRepoSuite) TestListSchedulable() {

 func (s *AccountRepoSuite) TestListSchedulableByGroupID_TimeBoundaries_And_StatusUpdates() {
 	now := time.Now()
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-sched"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-sched"})

-	okAcc := mustCreateAccount(s.T(), s.db, &model.Account{Name: "ok", Schedulable: true})
+	okAcc := mustCreateAccount(s.T(), s.db, &accountModel{Name: "ok", Schedulable: true})
 	mustBindAccountToGroup(s.T(), s.db, okAcc.ID, group.ID, 1)

 	future := now.Add(10 * time.Minute)
-	overloaded := mustCreateAccount(s.T(), s.db, &model.Account{Name: "over", Schedulable: true, OverloadUntil: &future})
+	overloaded := mustCreateAccount(s.T(), s.db, &accountModel{Name: "over", Schedulable: true, OverloadUntil: &future})
 	mustBindAccountToGroup(s.T(), s.db, overloaded.ID, group.ID, 1)

-	rateLimited := mustCreateAccount(s.T(), s.db, &model.Account{Name: "rl", Schedulable: true})
+	rateLimited := mustCreateAccount(s.T(), s.db, &accountModel{Name: "rl", Schedulable: true})
 	mustBindAccountToGroup(s.T(), s.db, rateLimited.ID, group.ID, 1)
 	s.Require().NoError(s.repo.SetRateLimited(s.ctx, rateLimited.ID, now.Add(10*time.Minute)), "SetRateLimited")

@@ -334,30 +339,30 @@ func (s *AccountRepoSuite) TestListSchedulableByGroupID_TimeBoundaries_And_Statu
 }

 func (s *AccountRepoSuite) TestListSchedulableByPlatform() {
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", Platform: model.PlatformAnthropic, Schedulable: true})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", Platform: model.PlatformOpenAI, Schedulable: true})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", Platform: service.PlatformAnthropic, Schedulable: true})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", Platform: service.PlatformOpenAI, Schedulable: true})

-	accounts, err := s.repo.ListSchedulableByPlatform(s.ctx, model.PlatformAnthropic)
+	accounts, err := s.repo.ListSchedulableByPlatform(s.ctx, service.PlatformAnthropic)
 	s.Require().NoError(err)
 	s.Require().Len(accounts, 1)
-	s.Require().Equal(model.PlatformAnthropic, accounts[0].Platform)
+	s.Require().Equal(service.PlatformAnthropic, accounts[0].Platform)
 }

 func (s *AccountRepoSuite) TestListSchedulableByGroupIDAndPlatform() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-sp"})
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", Platform: model.PlatformAnthropic, Schedulable: true})
-	a2 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", Platform: model.PlatformOpenAI, Schedulable: true})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-sp"})
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", Platform: service.PlatformAnthropic, Schedulable: true})
+	a2 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", Platform: service.PlatformOpenAI, Schedulable: true})
 	mustBindAccountToGroup(s.T(), s.db, a1.ID, group.ID, 1)
 	mustBindAccountToGroup(s.T(), s.db, a2.ID, group.ID, 2)

-	accounts, err := s.repo.ListSchedulableByGroupIDAndPlatform(s.ctx, group.ID, model.PlatformAnthropic)
+	accounts, err := s.repo.ListSchedulableByGroupIDAndPlatform(s.ctx, group.ID, service.PlatformAnthropic)
 	s.Require().NoError(err)
 	s.Require().Len(accounts, 1)
 	s.Require().Equal(a1.ID, accounts[0].ID)
 }

 func (s *AccountRepoSuite) TestSetSchedulable() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-sched", Schedulable: true})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-sched", Schedulable: true})

 	s.Require().NoError(s.repo.SetSchedulable(s.ctx, account.ID, false))

@@ -369,7 +374,7 @@ func (s *AccountRepoSuite) TestSetSchedulable() {
 // --- SetOverloaded / SetRateLimited / ClearRateLimit ---

 func (s *AccountRepoSuite) TestSetOverloaded() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-over"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-over"})
 	until := time.Date(2025, 6, 15, 12, 0, 0, 0, time.UTC)

 	s.Require().NoError(s.repo.SetOverloaded(s.ctx, account.ID, until))
@@ -381,7 +386,7 @@ func (s *AccountRepoSuite) TestSetOverloaded() {
 }

 func (s *AccountRepoSuite) TestSetRateLimited() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-rl"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-rl"})
 	resetAt := time.Date(2025, 6, 15, 14, 0, 0, 0, time.UTC)

 	s.Require().NoError(s.repo.SetRateLimited(s.ctx, account.ID, resetAt))
@@ -394,7 +399,7 @@ func (s *AccountRepoSuite) TestSetRateLimited() {
 }

 func (s *AccountRepoSuite) TestClearRateLimit() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-clear"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-clear"})
 	until := time.Now().Add(1 * time.Hour)
 	s.Require().NoError(s.repo.SetOverloaded(s.ctx, account.ID, until))
 	s.Require().NoError(s.repo.SetRateLimited(s.ctx, account.ID, until))
@@ -411,7 +416,7 @@ func (s *AccountRepoSuite) TestClearRateLimit() {
 // --- UpdateLastUsed ---

 func (s *AccountRepoSuite) TestUpdateLastUsed() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-used"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-used"})
 	s.Require().Nil(account.LastUsedAt)

 	s.Require().NoError(s.repo.UpdateLastUsed(s.ctx, account.ID))
@@ -424,20 +429,20 @@ func (s *AccountRepoSuite) TestUpdateLastUsed() {
 // --- SetError ---

 func (s *AccountRepoSuite) TestSetError() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-err", Status: model.StatusActive})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-err", Status: service.StatusActive})

 	s.Require().NoError(s.repo.SetError(s.ctx, account.ID, "something went wrong"))

 	got, err := s.repo.GetByID(s.ctx, account.ID)
 	s.Require().NoError(err)
-	s.Require().Equal(model.StatusError, got.Status)
+	s.Require().Equal(service.StatusError, got.Status)
 	s.Require().Equal("something went wrong", got.ErrorMessage)
 }

 // --- UpdateSessionWindow ---

 func (s *AccountRepoSuite) TestUpdateSessionWindow() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-win"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-win"})
 	start := time.Date(2025, 6, 15, 10, 0, 0, 0, time.UTC)
 	end := time.Date(2025, 6, 15, 15, 0, 0, 0, time.UTC)

@@ -453,9 +458,9 @@ func (s *AccountRepoSuite) TestUpdateSessionWindow() {
 // --- UpdateExtra ---

 func (s *AccountRepoSuite) TestUpdateExtra_MergesFields() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{
+	account := mustCreateAccount(s.T(), s.db, &accountModel{
 		Name:  "acc-extra",
-		Extra: model.JSONB{"a": "1"},
+		Extra: datatypes.JSONMap{"a": "1"},
 	})
 	s.Require().NoError(s.repo.UpdateExtra(s.ctx, account.ID, map[string]any{"b": "2"}), "UpdateExtra")

@@ -466,12 +471,12 @@ func (s *AccountRepoSuite) TestUpdateExtra_MergesFields() {
 }

 func (s *AccountRepoSuite) TestUpdateExtra_EmptyUpdates() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-extra-empty"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-extra-empty"})
 	s.Require().NoError(s.repo.UpdateExtra(s.ctx, account.ID, map[string]any{}))
 }

 func (s *AccountRepoSuite) TestUpdateExtra_NilExtra() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-nil-extra", Extra: nil})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-nil-extra", Extra: nil})
 	s.Require().NoError(s.repo.UpdateExtra(s.ctx, account.ID, map[string]any{"key": "val"}))

 	got, err := s.repo.GetByID(s.ctx, account.ID)
@@ -483,9 +488,9 @@ func (s *AccountRepoSuite) TestUpdateExtra_NilExtra() {

 func (s *AccountRepoSuite) TestGetByCRSAccountID() {
 	crsID := "crs-12345"
-	mustCreateAccount(s.T(), s.db, &model.Account{
+	mustCreateAccount(s.T(), s.db, &accountModel{
 		Name:  "acc-crs",
-		Extra: model.JSONB{"crs_account_id": crsID},
+		Extra: datatypes.JSONMap{"crs_account_id": crsID},
 	})

 	got, err := s.repo.GetByCRSAccountID(s.ctx, crsID)
@@ -509,8 +514,8 @@ func (s *AccountRepoSuite) TestGetByCRSAccountID_EmptyString() {
 // --- BulkUpdate ---

 func (s *AccountRepoSuite) TestBulkUpdate() {
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "bulk1", Priority: 1})
-	a2 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "bulk2", Priority: 1})
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "bulk1", Priority: 1})
+	a2 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "bulk2", Priority: 1})

 	newPriority := 99
 	affected, err := s.repo.BulkUpdate(s.ctx, []int64{a1.ID, a2.ID}, service.AccountBulkUpdate{
@@ -526,13 +531,13 @@ func (s *AccountRepoSuite) TestBulkUpdate() {
 }

 func (s *AccountRepoSuite) TestBulkUpdate_MergeCredentials() {
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{
 		Name:        "bulk-cred",
-		Credentials: model.JSONB{"existing": "value"},
+		Credentials: datatypes.JSONMap{"existing": "value"},
 	})

 	_, err := s.repo.BulkUpdate(s.ctx, []int64{a1.ID}, service.AccountBulkUpdate{
-		Credentials: model.JSONB{"new_key": "new_value"},
+		Credentials: datatypes.JSONMap{"new_key": "new_value"},
 	})
 	s.Require().NoError(err)

@@ -542,13 +547,13 @@ func (s *AccountRepoSuite) TestBulkUpdate_MergeCredentials() {
 }

 func (s *AccountRepoSuite) TestBulkUpdate_MergeExtra() {
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{
 		Name:  "bulk-extra",
-		Extra: model.JSONB{"existing": "val"},
+		Extra: datatypes.JSONMap{"existing": "val"},
 	})

 	_, err := s.repo.BulkUpdate(s.ctx, []int64{a1.ID}, service.AccountBulkUpdate{
-		Extra: model.JSONB{"new_key": "new_val"},
+		Extra: datatypes.JSONMap{"new_key": "new_val"},
 	})
 	s.Require().NoError(err)

@@ -564,14 +569,14 @@ func (s *AccountRepoSuite) TestBulkUpdate_EmptyIDs() {
 }

 func (s *AccountRepoSuite) TestBulkUpdate_EmptyUpdates() {
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "bulk-empty"})
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "bulk-empty"})

 	affected, err := s.repo.BulkUpdate(s.ctx, []int64{a1.ID}, service.AccountBulkUpdate{})
 	s.Require().NoError(err)
 	s.Require().Zero(affected)
 }

-func idsOfAccounts(accounts []model.Account) []int64 {
+func idsOfAccounts(accounts []service.Account) []int64 {
 	out := make([]int64, 0, len(accounts))
 	for i := range accounts {
 		out = append(out, accounts[i].ID)
--- a/backend/internal/repository/api_key_repo.go
+++ b/backend/internal/repository/api_key_repo.go
@@ -2,10 +2,10 @@ package repository

 import (
 	"context"
+	"time"

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"

 	"gorm.io/gorm"
@@ -19,42 +19,51 @@ func NewApiKeyRepository(db *gorm.DB) service.ApiKeyRepository {
 	return &apiKeyRepository{db: db}
 }

-func (r *apiKeyRepository) Create(ctx context.Context, key *model.ApiKey) error {
-	err := r.db.WithContext(ctx).Create(key).Error
+func (r *apiKeyRepository) Create(ctx context.Context, key *service.ApiKey) error {
+	m := apiKeyModelFromService(key)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyApiKeyModelToService(key, m)
+	}
 	return translatePersistenceError(err, nil, service.ErrApiKeyExists)
 }

-func (r *apiKeyRepository) GetByID(ctx context.Context, id int64) (*model.ApiKey, error) {
-	var key model.ApiKey
-	err := r.db.WithContext(ctx).Preload("User").Preload("Group").First(&key, id).Error
+func (r *apiKeyRepository) GetByID(ctx context.Context, id int64) (*service.ApiKey, error) {
+	var m apiKeyModel
+	err := r.db.WithContext(ctx).Preload("User").Preload("Group").First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrApiKeyNotFound, nil)
 	}
-	return &key, nil
+	return apiKeyModelToService(&m), nil
 }

-func (r *apiKeyRepository) GetByKey(ctx context.Context, key string) (*model.ApiKey, error) {
-	var apiKey model.ApiKey
-	err := r.db.WithContext(ctx).Preload("User").Preload("Group").Where("key = ?", key).First(&apiKey).Error
+func (r *apiKeyRepository) GetByKey(ctx context.Context, key string) (*service.ApiKey, error) {
+	var m apiKeyModel
+	err := r.db.WithContext(ctx).Preload("User").Preload("Group").Where("key = ?", key).First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrApiKeyNotFound, nil)
 	}
-	return &apiKey, nil
+	return apiKeyModelToService(&m), nil
 }

-func (r *apiKeyRepository) Update(ctx context.Context, key *model.ApiKey) error {
-	return r.db.WithContext(ctx).Model(key).Select("name", "group_id", "status", "updated_at").Updates(key).Error
+func (r *apiKeyRepository) Update(ctx context.Context, key *service.ApiKey) error {
+	m := apiKeyModelFromService(key)
+	err := r.db.WithContext(ctx).Model(m).Select("name", "group_id", "status", "updated_at").Updates(m).Error
+	if err == nil {
+		applyApiKeyModelToService(key, m)
+	}
+	return err
 }

 func (r *apiKeyRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.ApiKey{}, id).Error
+	return r.db.WithContext(ctx).Delete(&apiKeyModel{}, id).Error
 }

-func (r *apiKeyRepository) ListByUserID(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.ApiKey, *pagination.PaginationResult, error) {
-	var keys []model.ApiKey
+func (r *apiKeyRepository) ListByUserID(ctx context.Context, userID int64, params pagination.PaginationParams) ([]service.ApiKey, *pagination.PaginationResult, error) {
+	var keys []apiKeyModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.ApiKey{}).Where("user_id = ?", userID)
+	db := r.db.WithContext(ctx).Model(&apiKeyModel{}).Where("user_id = ?", userID)

 	if err := db.Count(&total).Error; err != nil {
 		return nil, nil, err
@@ -64,36 +73,31 @@ func (r *apiKeyRepository) ListByUserID(ctx context.Context, userID int64, param
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	outKeys := make([]service.ApiKey, 0, len(keys))
+	for i := range keys {
+		outKeys = append(outKeys, *apiKeyModelToService(&keys[i]))
 	}

-	return keys, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outKeys, paginationResultFromTotal(total, params), nil
 }

 func (r *apiKeyRepository) CountByUserID(ctx context.Context, userID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.ApiKey{}).Where("user_id = ?", userID).Count(&count).Error
+	err := r.db.WithContext(ctx).Model(&apiKeyModel{}).Where("user_id = ?", userID).Count(&count).Error
 	return count, err
 }

 func (r *apiKeyRepository) ExistsByKey(ctx context.Context, key string) (bool, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.ApiKey{}).Where("key = ?", key).Count(&count).Error
+	err := r.db.WithContext(ctx).Model(&apiKeyModel{}).Where("key = ?", key).Count(&count).Error
 	return count > 0, err
 }

-func (r *apiKeyRepository) ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]model.ApiKey, *pagination.PaginationResult, error) {
-	var keys []model.ApiKey
+func (r *apiKeyRepository) ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]service.ApiKey, *pagination.PaginationResult, error) {
+	var keys []apiKeyModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.ApiKey{}).Where("group_id = ?", groupID)
+	db := r.db.WithContext(ctx).Model(&apiKeyModel{}).Where("group_id = ?", groupID)

 	if err := db.Count(&total).Error; err != nil {
 		return nil, nil, err
@@ -103,24 +107,19 @@ func (r *apiKeyRepository) ListByGroupID(ctx context.Context, groupID int64, par
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	outKeys := make([]service.ApiKey, 0, len(keys))
+	for i := range keys {
+		outKeys = append(outKeys, *apiKeyModelToService(&keys[i]))
 	}

-	return keys, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outKeys, paginationResultFromTotal(total, params), nil
 }

 // SearchApiKeys searches API keys by user ID and/or keyword (name)
-func (r *apiKeyRepository) SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]model.ApiKey, error) {
-	var keys []model.ApiKey
+func (r *apiKeyRepository) SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]service.ApiKey, error) {
+	var keys []apiKeyModel

-	db := r.db.WithContext(ctx).Model(&model.ApiKey{})
+	db := r.db.WithContext(ctx).Model(&apiKeyModel{})

 	if userID > 0 {
 		db = db.Where("user_id = ?", userID)
@@ -135,12 +134,16 @@ func (r *apiKeyRepository) SearchApiKeys(ctx context.Context, userID int64, keyw
 		return nil, err
 	}

-	return keys, nil
+	outKeys := make([]service.ApiKey, 0, len(keys))
+	for i := range keys {
+		outKeys = append(outKeys, *apiKeyModelToService(&keys[i]))
+	}
+	return outKeys, nil
 }

 // ClearGroupIDByGroupID 将指定分组的所有 API Key 的 group_id 设为 nil
 func (r *apiKeyRepository) ClearGroupIDByGroupID(ctx context.Context, groupID int64) (int64, error) {
-	result := r.db.WithContext(ctx).Model(&model.ApiKey{}).
+	result := r.db.WithContext(ctx).Model(&apiKeyModel{}).
 		Where("group_id = ?", groupID).
 		Update("group_id", nil)
 	return result.RowsAffected, result.Error
@@ -149,6 +152,66 @@ func (r *apiKeyRepository) ClearGroupIDByGroupID(ctx context.Context, groupID in
 // CountByGroupID 获取分组的 API Key 数量
 func (r *apiKeyRepository) CountByGroupID(ctx context.Context, groupID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.ApiKey{}).Where("group_id = ?", groupID).Count(&count).Error
+	err := r.db.WithContext(ctx).Model(&apiKeyModel{}).Where("group_id = ?", groupID).Count(&count).Error
 	return count, err
 }
+
+type apiKeyModel struct {
+	ID        int64          `gorm:"primaryKey"`
+	UserID    int64          `gorm:"index;not null"`
+	Key       string         `gorm:"uniqueIndex;size:128;not null"`
+	Name      string         `gorm:"size:100;not null"`
+	GroupID   *int64         `gorm:"index"`
+	Status    string         `gorm:"size:20;default:active;not null"`
+	CreatedAt time.Time      `gorm:"not null"`
+	UpdatedAt time.Time      `gorm:"not null"`
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+
+	User  *userModel  `gorm:"foreignKey:UserID"`
+	Group *groupModel `gorm:"foreignKey:GroupID"`
+}
+
+func (apiKeyModel) TableName() string { return "api_keys" }
+
+func apiKeyModelToService(m *apiKeyModel) *service.ApiKey {
+	if m == nil {
+		return nil
+	}
+	return &service.ApiKey{
+		ID:        m.ID,
+		UserID:    m.UserID,
+		Key:       m.Key,
+		Name:      m.Name,
+		GroupID:   m.GroupID,
+		Status:    m.Status,
+		CreatedAt: m.CreatedAt,
+		UpdatedAt: m.UpdatedAt,
+		User:      userModelToService(m.User),
+		Group:     groupModelToService(m.Group),
+	}
+}
+
+func apiKeyModelFromService(k *service.ApiKey) *apiKeyModel {
+	if k == nil {
+		return nil
+	}
+	return &apiKeyModel{
+		ID:        k.ID,
+		UserID:    k.UserID,
+		Key:       k.Key,
+		Name:      k.Name,
+		GroupID:   k.GroupID,
+		Status:    k.Status,
+		CreatedAt: k.CreatedAt,
+		UpdatedAt: k.UpdatedAt,
+	}
+}
+
+func applyApiKeyModelToService(key *service.ApiKey, m *apiKeyModel) {
+	if key == nil || m == nil {
+		return
+	}
+	key.ID = m.ID
+	key.CreatedAt = m.CreatedAt
+	key.UpdatedAt = m.UpdatedAt
+}
--- a/backend/internal/repository/api_key_repo_integration_test.go
+++ b/backend/internal/repository/api_key_repo_integration_test.go
@@ -6,8 +6,8 @@ import (
 	"context"
 	"testing"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
 	"gorm.io/gorm"
 )
@@ -32,13 +32,13 @@ func TestApiKeyRepoSuite(t *testing.T) {
 // --- Create / GetByID / GetByKey ---

 func (s *ApiKeyRepoSuite) TestCreate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "create@test.com"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "create@test.com"})

-	key := &model.ApiKey{
+	key := &service.ApiKey{
 		UserID: user.ID,
 		Key:    "sk-create-test",
 		Name:   "Test Key",
-		Status: model.StatusActive,
+		Status: service.StatusActive,
 	}

 	err := s.repo.Create(s.ctx, key)
@@ -56,15 +56,15 @@ func (s *ApiKeyRepoSuite) TestGetByID_NotFound() {
 }

 func (s *ApiKeyRepoSuite) TestGetByKey() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "getbykey@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-key"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "getbykey@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-key"})

-	key := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	key := mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID:  user.ID,
 		Key:     "sk-getbykey",
 		Name:    "My Key",
 		GroupID: &group.ID,
-		Status:  model.StatusActive,
+		Status:  service.StatusActive,
 	})

 	got, err := s.repo.GetByKey(s.ctx, key.Key)
@@ -84,16 +84,16 @@ func (s *ApiKeyRepoSuite) TestGetByKey_NotFound() {
 // --- Update ---

 func (s *ApiKeyRepoSuite) TestUpdate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "update@test.com"})
-	key := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "update@test.com"})
+	key := apiKeyModelToService(mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID: user.ID,
 		Key:    "sk-update",
 		Name:   "Original",
-		Status: model.StatusActive,
-	})
+		Status: service.StatusActive,
+	}))

 	key.Name = "Renamed"
-	key.Status = model.StatusDisabled
+	key.Status = service.StatusDisabled
 	err := s.repo.Update(s.ctx, key)
 	s.Require().NoError(err, "Update")

@@ -102,18 +102,18 @@ func (s *ApiKeyRepoSuite) TestUpdate() {
 	s.Require().Equal("sk-update", got.Key, "Update should not change key")
 	s.Require().Equal(user.ID, got.UserID, "Update should not change user_id")
 	s.Require().Equal("Renamed", got.Name)
-	s.Require().Equal(model.StatusDisabled, got.Status)
+	s.Require().Equal(service.StatusDisabled, got.Status)
 }

 func (s *ApiKeyRepoSuite) TestUpdate_ClearGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "cleargroup@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-clear"})
-	key := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "cleargroup@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-clear"})
+	key := apiKeyModelToService(mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID:  user.ID,
 		Key:     "sk-clear-group",
 		Name:    "Group Key",
 		GroupID: &group.ID,
-	})
+	}))

 	key.GroupID = nil
 	err := s.repo.Update(s.ctx, key)
@@ -127,8 +127,8 @@ func (s *ApiKeyRepoSuite) TestUpdate_ClearGroupID() {
 // --- Delete ---

 func (s *ApiKeyRepoSuite) TestDelete() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "delete@test.com"})
-	key := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "delete@test.com"})
+	key := mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID: user.ID,
 		Key:    "sk-delete",
 		Name:   "Delete Me",
@@ -144,9 +144,9 @@ func (s *ApiKeyRepoSuite) TestDelete() {
 // --- ListByUserID / CountByUserID ---

 func (s *ApiKeyRepoSuite) TestListByUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listbyuser@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-list-1", Name: "Key 1"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-list-2", Name: "Key 2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listbyuser@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-list-1", Name: "Key 1"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-list-2", Name: "Key 2"})

 	keys, page, err := s.repo.ListByUserID(s.ctx, user.ID, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "ListByUserID")
@@ -155,9 +155,9 @@ func (s *ApiKeyRepoSuite) TestListByUserID() {
 }

 func (s *ApiKeyRepoSuite) TestListByUserID_Pagination() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "paging@test.com"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "paging@test.com"})
 	for i := 0; i < 5; i++ {
-		mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+		mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 			UserID: user.ID,
 			Key:    "sk-page-" + string(rune('a'+i)),
 			Name:   "Key",
@@ -172,9 +172,9 @@ func (s *ApiKeyRepoSuite) TestListByUserID_Pagination() {
 }

 func (s *ApiKeyRepoSuite) TestCountByUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "count@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-count-1", Name: "K1"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-count-2", Name: "K2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "count@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-count-1", Name: "K1"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-count-2", Name: "K2"})

 	count, err := s.repo.CountByUserID(s.ctx, user.ID)
 	s.Require().NoError(err, "CountByUserID")
@@ -184,12 +184,12 @@ func (s *ApiKeyRepoSuite) TestCountByUserID() {
 // --- ListByGroupID / CountByGroupID ---

 func (s *ApiKeyRepoSuite) TestListByGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listbygroup@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-list"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listbygroup@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-list"})

-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-grp-1", Name: "K1", GroupID: &group.ID})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-grp-2", Name: "K2", GroupID: &group.ID})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-grp-3", Name: "K3"}) // no group
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-grp-1", Name: "K1", GroupID: &group.ID})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-grp-2", Name: "K2", GroupID: &group.ID})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-grp-3", Name: "K3"}) // no group

 	keys, page, err := s.repo.ListByGroupID(s.ctx, group.ID, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "ListByGroupID")
@@ -200,10 +200,10 @@ func (s *ApiKeyRepoSuite) TestListByGroupID() {
 }

 func (s *ApiKeyRepoSuite) TestCountByGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "countgroup@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-count"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "countgroup@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-count"})

-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-gc-1", Name: "K1", GroupID: &group.ID})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-gc-1", Name: "K1", GroupID: &group.ID})

 	count, err := s.repo.CountByGroupID(s.ctx, group.ID)
 	s.Require().NoError(err, "CountByGroupID")
@@ -213,8 +213,8 @@ func (s *ApiKeyRepoSuite) TestCountByGroupID() {
 // --- ExistsByKey ---

 func (s *ApiKeyRepoSuite) TestExistsByKey() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "exists@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-exists", Name: "K"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "exists@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-exists", Name: "K"})

 	exists, err := s.repo.ExistsByKey(s.ctx, "sk-exists")
 	s.Require().NoError(err, "ExistsByKey")
@@ -228,9 +228,9 @@ func (s *ApiKeyRepoSuite) TestExistsByKey() {
 // --- SearchApiKeys ---

 func (s *ApiKeyRepoSuite) TestSearchApiKeys() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "search@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-search-1", Name: "Production Key"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-search-2", Name: "Development Key"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "search@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-search-1", Name: "Production Key"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-search-2", Name: "Development Key"})

 	found, err := s.repo.SearchApiKeys(s.ctx, user.ID, "prod", 10)
 	s.Require().NoError(err, "SearchApiKeys")
@@ -239,9 +239,9 @@ func (s *ApiKeyRepoSuite) TestSearchApiKeys() {
 }

 func (s *ApiKeyRepoSuite) TestSearchApiKeys_NoKeyword() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "searchnokw@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-nk-1", Name: "K1"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-nk-2", Name: "K2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "searchnokw@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-nk-1", Name: "K1"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-nk-2", Name: "K2"})

 	found, err := s.repo.SearchApiKeys(s.ctx, user.ID, "", 10)
 	s.Require().NoError(err)
@@ -249,8 +249,8 @@ func (s *ApiKeyRepoSuite) TestSearchApiKeys_NoKeyword() {
 }

 func (s *ApiKeyRepoSuite) TestSearchApiKeys_NoUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "searchnouid@test.com"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-nu-1", Name: "TestKey"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "searchnouid@test.com"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-nu-1", Name: "TestKey"})

 	found, err := s.repo.SearchApiKeys(s.ctx, 0, "testkey", 10)
 	s.Require().NoError(err)
@@ -260,12 +260,12 @@ func (s *ApiKeyRepoSuite) TestSearchApiKeys_NoUserID() {
 // --- ClearGroupIDByGroupID ---

 func (s *ApiKeyRepoSuite) TestClearGroupIDByGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "cleargrp@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-clear-bulk"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "cleargrp@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-clear-bulk"})

-	k1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-clr-1", Name: "K1", GroupID: &group.ID})
-	k2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-clr-2", Name: "K2", GroupID: &group.ID})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-clr-3", Name: "K3"}) // no group
+	k1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-clr-1", Name: "K1", GroupID: &group.ID})
+	k2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-clr-2", Name: "K2", GroupID: &group.ID})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-clr-3", Name: "K3"}) // no group

 	affected, err := s.repo.ClearGroupIDByGroupID(s.ctx, group.ID)
 	s.Require().NoError(err, "ClearGroupIDByGroupID")
@@ -283,16 +283,16 @@ func (s *ApiKeyRepoSuite) TestClearGroupIDByGroupID() {
 // --- Combined CRUD/Search/ClearGroupID (original test preserved as integration) ---

 func (s *ApiKeyRepoSuite) TestCRUD_Search_ClearGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "k@example.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-k"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "k@example.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-k"})

-	key := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	key := apiKeyModelToService(mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID:  user.ID,
 		Key:     "sk-test-1",
 		Name:    "My Key",
 		GroupID: &group.ID,
-		Status:  model.StatusActive,
-	})
+		Status:  service.StatusActive,
+	}))

 	got, err := s.repo.GetByKey(s.ctx, key.Key)
 	s.Require().NoError(err, "GetByKey")
@@ -303,7 +303,7 @@ func (s *ApiKeyRepoSuite) TestCRUD_Search_ClearGroupID() {
 	s.Require().Equal(group.ID, got.Group.ID)

 	key.Name = "Renamed"
-	key.Status = model.StatusDisabled
+	key.Status = service.StatusDisabled
 	key.GroupID = nil
 	s.Require().NoError(s.repo.Update(s.ctx, key), "Update")

@@ -312,7 +312,7 @@ func (s *ApiKeyRepoSuite) TestCRUD_Search_ClearGroupID() {
 	s.Require().Equal("sk-test-1", got2.Key, "Update should not change key")
 	s.Require().Equal(user.ID, got2.UserID, "Update should not change user_id")
 	s.Require().Equal("Renamed", got2.Name)
-	s.Require().Equal(model.StatusDisabled, got2.Status)
+	s.Require().Equal(service.StatusDisabled, got2.Status)
 	s.Require().Nil(got2.GroupID)

 	keys, page, err := s.repo.ListByUserID(s.ctx, user.ID, pagination.PaginationParams{Page: 1, PageSize: 10})
@@ -330,7 +330,7 @@ func (s *ApiKeyRepoSuite) TestCRUD_Search_ClearGroupID() {
 	s.Require().Equal(key.ID, found[0].ID)

 	// ClearGroupIDByGroupID
-	k2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{
+	k2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{
 		UserID:  user.ID,
 		Key:     "sk-test-2",
 		Name:    "Group Key",
--- a/backend/internal/repository/auto_migrate.go
+++ b/backend/internal/repository/auto_migrate.go
@@ -0,0 +1,20 @@
+package repository
+
+import "gorm.io/gorm"
+
+// AutoMigrate runs schema migrations for all repository persistence models.
+// Persistence models are defined within individual `*_repo.go` files.
+func AutoMigrate(db *gorm.DB) error {
+	return db.AutoMigrate(
+		&userModel{},
+		&apiKeyModel{},
+		&groupModel{},
+		&accountModel{},
+		&accountGroupModel{},
+		&proxyModel{},
+		&redeemCodeModel{},
+		&usageLogModel{},
+		&settingModel{},
+		&userSubscriptionModel{},
+	)
+}
--- a/backend/internal/repository/fixtures_integration_test.go
+++ b/backend/internal/repository/fixtures_integration_test.go
@@ -6,21 +6,25 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/require"
+	"gorm.io/datatypes"
 	"gorm.io/gorm"
 )

-func mustCreateUser(t *testing.T, db *gorm.DB, u *model.User) *model.User {
+func mustCreateUser(t *testing.T, db *gorm.DB, u *userModel) *userModel {
 	t.Helper()
 	if u.PasswordHash == "" {
 		u.PasswordHash = "test-password-hash"
 	}
 	if u.Role == "" {
-		u.Role = model.RoleUser
+		u.Role = service.RoleUser
 	}
 	if u.Status == "" {
-		u.Status = model.StatusActive
+		u.Status = service.StatusActive
+	}
+	if u.Concurrency == 0 {
+		u.Concurrency = 5
 	}
 	if u.CreatedAt.IsZero() {
 		u.CreatedAt = time.Now()
@@ -32,16 +36,16 @@ func mustCreateUser(t *testing.T, db *gorm.DB, u *model.User) *model.User {
 	return u
 }

-func mustCreateGroup(t *testing.T, db *gorm.DB, g *model.Group) *model.Group {
+func mustCreateGroup(t *testing.T, db *gorm.DB, g *groupModel) *groupModel {
 	t.Helper()
 	if g.Platform == "" {
-		g.Platform = model.PlatformAnthropic
+		g.Platform = service.PlatformAnthropic
 	}
 	if g.Status == "" {
-		g.Status = model.StatusActive
+		g.Status = service.StatusActive
 	}
 	if g.SubscriptionType == "" {
-		g.SubscriptionType = model.SubscriptionTypeStandard
+		g.SubscriptionType = service.SubscriptionTypeStandard
 	}
 	if g.CreatedAt.IsZero() {
 		g.CreatedAt = time.Now()
@@ -53,7 +57,7 @@ func mustCreateGroup(t *testing.T, db *gorm.DB, g *model.Group) *model.Group {
 	return g
 }

-func mustCreateProxy(t *testing.T, db *gorm.DB, p *model.Proxy) *model.Proxy {
+func mustCreateProxy(t *testing.T, db *gorm.DB, p *proxyModel) *proxyModel {
 	t.Helper()
 	if p.Protocol == "" {
 		p.Protocol = "http"
@@ -65,7 +69,7 @@ func mustCreateProxy(t *testing.T, db *gorm.DB, p *model.Proxy) *model.Proxy {
 		p.Port = 8080
 	}
 	if p.Status == "" {
-		p.Status = model.StatusActive
+		p.Status = service.StatusActive
 	}
 	if p.CreatedAt.IsZero() {
 		p.CreatedAt = time.Now()
@@ -77,25 +81,25 @@ func mustCreateProxy(t *testing.T, db *gorm.DB, p *model.Proxy) *model.Proxy {
 	return p
 }

-func mustCreateAccount(t *testing.T, db *gorm.DB, a *model.Account) *model.Account {
+func mustCreateAccount(t *testing.T, db *gorm.DB, a *accountModel) *accountModel {
 	t.Helper()
 	if a.Platform == "" {
-		a.Platform = model.PlatformAnthropic
+		a.Platform = service.PlatformAnthropic
 	}
 	if a.Type == "" {
-		a.Type = model.AccountTypeOAuth
+		a.Type = service.AccountTypeOAuth
 	}
 	if a.Status == "" {
-		a.Status = model.StatusActive
+		a.Status = service.StatusActive
 	}
 	if !a.Schedulable {
 		a.Schedulable = true
 	}
 	if a.Credentials == nil {
-		a.Credentials = model.JSONB{}
+		a.Credentials = datatypes.JSONMap{}
 	}
 	if a.Extra == nil {
-		a.Extra = model.JSONB{}
+		a.Extra = datatypes.JSONMap{}
 	}
 	if a.CreatedAt.IsZero() {
 		a.CreatedAt = time.Now()
@@ -107,10 +111,10 @@ func mustCreateAccount(t *testing.T, db *gorm.DB, a *model.Account) *model.Accou
 	return a
 }

-func mustCreateApiKey(t *testing.T, db *gorm.DB, k *model.ApiKey) *model.ApiKey {
+func mustCreateApiKey(t *testing.T, db *gorm.DB, k *apiKeyModel) *apiKeyModel {
 	t.Helper()
 	if k.Status == "" {
-		k.Status = model.StatusActive
+		k.Status = service.StatusActive
 	}
 	if k.CreatedAt.IsZero() {
 		k.CreatedAt = time.Now()
@@ -122,13 +126,13 @@ func mustCreateApiKey(t *testing.T, db *gorm.DB, k *model.ApiKey) *model.ApiKey
 	return k
 }

-func mustCreateRedeemCode(t *testing.T, db *gorm.DB, c *model.RedeemCode) *model.RedeemCode {
+func mustCreateRedeemCode(t *testing.T, db *gorm.DB, c *redeemCodeModel) *redeemCodeModel {
 	t.Helper()
 	if c.Status == "" {
-		c.Status = model.StatusUnused
+		c.Status = service.StatusUnused
 	}
 	if c.Type == "" {
-		c.Type = model.RedeemTypeBalance
+		c.Type = service.RedeemTypeBalance
 	}
 	if c.CreatedAt.IsZero() {
 		c.CreatedAt = time.Now()
@@ -137,10 +141,10 @@ func mustCreateRedeemCode(t *testing.T, db *gorm.DB, c *model.RedeemCode) *model
 	return c
 }

-func mustCreateSubscription(t *testing.T, db *gorm.DB, s *model.UserSubscription) *model.UserSubscription {
+func mustCreateSubscription(t *testing.T, db *gorm.DB, s *userSubscriptionModel) *userSubscriptionModel {
 	t.Helper()
 	if s.Status == "" {
-		s.Status = model.SubscriptionStatusActive
+		s.Status = service.SubscriptionStatusActive
 	}
 	now := time.Now()
 	if s.StartsAt.IsZero() {
@@ -164,9 +168,10 @@ func mustCreateSubscription(t *testing.T, db *gorm.DB, s *model.UserSubscription

 func mustBindAccountToGroup(t *testing.T, db *gorm.DB, accountID, groupID int64, priority int) {
 	t.Helper()
-	require.NoError(t, db.Create(&model.AccountGroup{
+	require.NoError(t, db.Create(&accountGroupModel{
 		AccountID: accountID,
 		GroupID:   groupID,
 		Priority:  priority,
+		CreatedAt: time.Now(),
 	}).Error, "create account_group")
 }
--- a/backend/internal/repository/group_repo.go
+++ b/backend/internal/repository/group_repo.go
@@ -2,10 +2,10 @@ package repository

 import (
 	"context"
+	"time"

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"

 	"gorm.io/gorm"
@@ -20,38 +20,50 @@ func NewGroupRepository(db *gorm.DB) service.GroupRepository {
 	return &groupRepository{db: db}
 }

-func (r *groupRepository) Create(ctx context.Context, group *model.Group) error {
-	err := r.db.WithContext(ctx).Create(group).Error
+func (r *groupRepository) Create(ctx context.Context, group *service.Group) error {
+	m := groupModelFromService(group)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyGroupModelToService(group, m)
+	}
 	return translatePersistenceError(err, nil, service.ErrGroupExists)
 }

-func (r *groupRepository) GetByID(ctx context.Context, id int64) (*model.Group, error) {
-	var group model.Group
-	err := r.db.WithContext(ctx).First(&group, id).Error
+func (r *groupRepository) GetByID(ctx context.Context, id int64) (*service.Group, error) {
+	var m groupModel
+	err := r.db.WithContext(ctx).First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrGroupNotFound, nil)
 	}
-	return &group, nil
+	group := groupModelToService(&m)
+	count, _ := r.GetAccountCount(ctx, group.ID)
+	group.AccountCount = count
+	return group, nil
 }

-func (r *groupRepository) Update(ctx context.Context, group *model.Group) error {
-	return r.db.WithContext(ctx).Save(group).Error
+func (r *groupRepository) Update(ctx context.Context, group *service.Group) error {
+	m := groupModelFromService(group)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyGroupModelToService(group, m)
+	}
+	return err
 }

 func (r *groupRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.Group{}, id).Error
+	return r.db.WithContext(ctx).Delete(&groupModel{}, id).Error
 }

-func (r *groupRepository) List(ctx context.Context, params pagination.PaginationParams) ([]model.Group, *pagination.PaginationResult, error) {
+func (r *groupRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.Group, *pagination.PaginationResult, error) {
 	return r.ListWithFilters(ctx, params, "", "", nil)
 }

 // ListWithFilters lists groups with optional filtering by platform, status, and is_exclusive
-func (r *groupRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, status string, isExclusive *bool) ([]model.Group, *pagination.PaginationResult, error) {
-	var groups []model.Group
+func (r *groupRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, status string, isExclusive *bool) ([]service.Group, *pagination.PaginationResult, error) {
+	var groups []groupModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.Group{})
+	db := r.db.WithContext(ctx).Model(&groupModel{})

 	// Apply filters
 	if platform != "" {
@@ -72,68 +84,71 @@ func (r *groupRepository) ListWithFilters(ctx context.Context, params pagination
 		return nil, nil, err
 	}

-	// 获取每个分组的账号数量
+	outGroups := make([]service.Group, 0, len(groups))
 	for i := range groups {
-		count, _ := r.GetAccountCount(ctx, groups[i].ID)
-		groups[i].AccountCount = count
+		outGroups = append(outGroups, *groupModelToService(&groups[i]))
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	// 获取每个分组的账号数量
+	for i := range outGroups {
+		count, _ := r.GetAccountCount(ctx, outGroups[i].ID)
+		outGroups[i].AccountCount = count
 	}

-	return groups, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outGroups, paginationResultFromTotal(total, params), nil
 }

-func (r *groupRepository) ListActive(ctx context.Context) ([]model.Group, error) {
-	var groups []model.Group
-	err := r.db.WithContext(ctx).Where("status = ?", model.StatusActive).Order("id ASC").Find(&groups).Error
+func (r *groupRepository) ListActive(ctx context.Context) ([]service.Group, error) {
+	var groups []groupModel
+	err := r.db.WithContext(ctx).Where("status = ?", service.StatusActive).Order("id ASC").Find(&groups).Error
 	if err != nil {
 		return nil, err
 	}
-	// 获取每个分组的账号数量
+	outGroups := make([]service.Group, 0, len(groups))
 	for i := range groups {
-		count, _ := r.GetAccountCount(ctx, groups[i].ID)
-		groups[i].AccountCount = count
+		outGroups = append(outGroups, *groupModelToService(&groups[i]))
 	}
-	return groups, nil
+	// 获取每个分组的账号数量
+	for i := range outGroups {
+		count, _ := r.GetAccountCount(ctx, outGroups[i].ID)
+		outGroups[i].AccountCount = count
+	}
+	return outGroups, nil
 }

-func (r *groupRepository) ListActiveByPlatform(ctx context.Context, platform string) ([]model.Group, error) {
-	var groups []model.Group
-	err := r.db.WithContext(ctx).Where("status = ? AND platform = ?", model.StatusActive, platform).Order("id ASC").Find(&groups).Error
+func (r *groupRepository) ListActiveByPlatform(ctx context.Context, platform string) ([]service.Group, error) {
+	var groups []groupModel
+	err := r.db.WithContext(ctx).Where("status = ? AND platform = ?", service.StatusActive, platform).Order("id ASC").Find(&groups).Error
 	if err != nil {
 		return nil, err
 	}
-	// 获取每个分组的账号数量
+	outGroups := make([]service.Group, 0, len(groups))
 	for i := range groups {
-		count, _ := r.GetAccountCount(ctx, groups[i].ID)
-		groups[i].AccountCount = count
+		outGroups = append(outGroups, *groupModelToService(&groups[i]))
 	}
-	return groups, nil
+	// 获取每个分组的账号数量
+	for i := range outGroups {
+		count, _ := r.GetAccountCount(ctx, outGroups[i].ID)
+		outGroups[i].AccountCount = count
+	}
+	return outGroups, nil
 }

 func (r *groupRepository) ExistsByName(ctx context.Context, name string) (bool, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.Group{}).Where("name = ?", name).Count(&count).Error
+	err := r.db.WithContext(ctx).Model(&groupModel{}).Where("name = ?", name).Count(&count).Error
 	return count > 0, err
 }

 func (r *groupRepository) GetAccountCount(ctx context.Context, groupID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.AccountGroup{}).Where("group_id = ?", groupID).Count(&count).Error
+	err := r.db.WithContext(ctx).Table("account_groups").Where("group_id = ?", groupID).Count(&count).Error
 	return count, err
 }

 // DeleteAccountGroupsByGroupID 删除分组与账号的关联关系
 func (r *groupRepository) DeleteAccountGroupsByGroupID(ctx context.Context, groupID int64) (int64, error) {
-	result := r.db.WithContext(ctx).Where("group_id = ?", groupID).Delete(&model.AccountGroup{})
+	result := r.db.WithContext(ctx).Exec("DELETE FROM account_groups WHERE group_id = ?", groupID)
 	return result.RowsAffected, result.Error
 }

@@ -145,46 +160,42 @@ func (r *groupRepository) DeleteCascade(ctx context.Context, id int64) ([]int64,

 	var affectedUserIDs []int64
 	if group.IsSubscriptionType() {
-		var subscriptions []model.UserSubscription
 		if err := r.db.WithContext(ctx).
-			Model(&model.UserSubscription{}).
+			Table("user_subscriptions").
 			Where("group_id = ?", id).
-			Select("user_id").
-			Find(&subscriptions).Error; err != nil {
+			Pluck("user_id", &affectedUserIDs).Error; err != nil {
 			return nil, err
 		}
-		for _, sub := range subscriptions {
-			affectedUserIDs = append(affectedUserIDs, sub.UserID)
-		}
 	}

 	err = r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		// 1. 删除订阅类型分组的订阅记录
 		if group.IsSubscriptionType() {
-			if err := tx.Where("group_id = ?", id).Delete(&model.UserSubscription{}).Error; err != nil {
+			if err := tx.Exec("DELETE FROM user_subscriptions WHERE group_id = ?", id).Error; err != nil {
 				return err
 			}
 		}

 		// 2. 将 api_keys 中绑定该分组的 group_id 设为 nil
-		if err := tx.Model(&model.ApiKey{}).Where("group_id = ?", id).Update("group_id", nil).Error; err != nil {
+		if err := tx.Exec("UPDATE api_keys SET group_id = NULL WHERE group_id = ?", id).Error; err != nil {
 			return err
 		}

 		// 3. 从 users.allowed_groups 数组中移除该分组 ID
-		if err := tx.Model(&model.User{}).
-			Where("? = ANY(allowed_groups)", id).
-			Update("allowed_groups", gorm.Expr("array_remove(allowed_groups, ?)", id)).Error; err != nil {
+		if err := tx.Exec(
+			"UPDATE users SET allowed_groups = array_remove(allowed_groups, ?) WHERE ? = ANY(allowed_groups)",
+			id, id,
+		).Error; err != nil {
 			return err
 		}

 		// 4. 删除 account_groups 中间表的数据
-		if err := tx.Where("group_id = ?", id).Delete(&model.AccountGroup{}).Error; err != nil {
+		if err := tx.Exec("DELETE FROM account_groups WHERE group_id = ?", id).Error; err != nil {
 			return err
 		}

 		// 5. 删除分组本身（带锁，避免并发写）
-		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Delete(&model.Group{}, id).Error; err != nil {
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Delete(&groupModel{}, id).Error; err != nil {
 			return err
 		}

@@ -196,3 +207,75 @@ func (r *groupRepository) DeleteCascade(ctx context.Context, id int64) ([]int64,

 	return affectedUserIDs, nil
 }
+
+type groupModel struct {
+	ID             int64   `gorm:"primaryKey"`
+	Name           string  `gorm:"uniqueIndex;size:100;not null"`
+	Description    string  `gorm:"type:text"`
+	Platform       string  `gorm:"size:50;default:anthropic;not null"`
+	RateMultiplier float64 `gorm:"type:decimal(10,4);default:1.0;not null"`
+	IsExclusive    bool    `gorm:"default:false;not null"`
+	Status         string  `gorm:"size:20;default:active;not null"`
+
+	SubscriptionType string   `gorm:"size:20;default:standard;not null"`
+	DailyLimitUSD    *float64 `gorm:"type:decimal(20,8)"`
+	WeeklyLimitUSD   *float64 `gorm:"type:decimal(20,8)"`
+	MonthlyLimitUSD  *float64 `gorm:"type:decimal(20,8)"`
+
+	CreatedAt time.Time      `gorm:"not null"`
+	UpdatedAt time.Time      `gorm:"not null"`
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+}
+
+func (groupModel) TableName() string { return "groups" }
+
+func groupModelToService(m *groupModel) *service.Group {
+	if m == nil {
+		return nil
+	}
+	return &service.Group{
+		ID:               m.ID,
+		Name:             m.Name,
+		Description:      m.Description,
+		Platform:         m.Platform,
+		RateMultiplier:   m.RateMultiplier,
+		IsExclusive:      m.IsExclusive,
+		Status:           m.Status,
+		SubscriptionType: m.SubscriptionType,
+		DailyLimitUSD:    m.DailyLimitUSD,
+		WeeklyLimitUSD:   m.WeeklyLimitUSD,
+		MonthlyLimitUSD:  m.MonthlyLimitUSD,
+		CreatedAt:        m.CreatedAt,
+		UpdatedAt:        m.UpdatedAt,
+	}
+}
+
+func groupModelFromService(sg *service.Group) *groupModel {
+	if sg == nil {
+		return nil
+	}
+	return &groupModel{
+		ID:               sg.ID,
+		Name:             sg.Name,
+		Description:      sg.Description,
+		Platform:         sg.Platform,
+		RateMultiplier:   sg.RateMultiplier,
+		IsExclusive:      sg.IsExclusive,
+		Status:           sg.Status,
+		SubscriptionType: sg.SubscriptionType,
+		DailyLimitUSD:    sg.DailyLimitUSD,
+		WeeklyLimitUSD:   sg.WeeklyLimitUSD,
+		MonthlyLimitUSD:  sg.MonthlyLimitUSD,
+		CreatedAt:        sg.CreatedAt,
+		UpdatedAt:        sg.UpdatedAt,
+	}
+}
+
+func applyGroupModelToService(group *service.Group, m *groupModel) {
+	if group == nil || m == nil {
+		return
+	}
+	group.ID = m.ID
+	group.CreatedAt = m.CreatedAt
+	group.UpdatedAt = m.UpdatedAt
+}
--- a/backend/internal/repository/group_repo_integration_test.go
+++ b/backend/internal/repository/group_repo_integration_test.go
@@ -6,8 +6,8 @@ import (
 	"context"
 	"testing"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
 	"gorm.io/gorm"
 )
@@ -32,10 +32,10 @@ func TestGroupRepoSuite(t *testing.T) {
 // --- Create / GetByID / Update / Delete ---

 func (s *GroupRepoSuite) TestCreate() {
-	group := &model.Group{
+	group := &service.Group{
 		Name:     "test-create",
-		Platform: model.PlatformAnthropic,
-		Status:   model.StatusActive,
+		Platform: service.PlatformAnthropic,
+		Status:   service.StatusActive,
 	}

 	err := s.repo.Create(s.ctx, group)
@@ -53,7 +53,7 @@ func (s *GroupRepoSuite) TestGetByID_NotFound() {
 }

 func (s *GroupRepoSuite) TestUpdate() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "original"})
+	group := groupModelToService(mustCreateGroup(s.T(), s.db, &groupModel{Name: "original"}))

 	group.Name = "updated"
 	err := s.repo.Update(s.ctx, group)
@@ -65,7 +65,7 @@ func (s *GroupRepoSuite) TestUpdate() {
 }

 func (s *GroupRepoSuite) TestDelete() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "to-delete"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "to-delete"})

 	err := s.repo.Delete(s.ctx, group.ID)
 	s.Require().NoError(err, "Delete")
@@ -77,8 +77,8 @@ func (s *GroupRepoSuite) TestDelete() {
 // --- List / ListWithFilters ---

 func (s *GroupRepoSuite) TestList() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1"})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2"})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1"})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2"})

 	groups, page, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "List")
@@ -87,28 +87,28 @@ func (s *GroupRepoSuite) TestList() {
 }

 func (s *GroupRepoSuite) TestListWithFilters_Platform() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1", Platform: model.PlatformAnthropic})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2", Platform: model.PlatformOpenAI})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1", Platform: service.PlatformAnthropic})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2", Platform: service.PlatformOpenAI})

-	groups, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.PlatformOpenAI, "", nil)
+	groups, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.PlatformOpenAI, "", nil)
 	s.Require().NoError(err)
 	s.Require().Len(groups, 1)
-	s.Require().Equal(model.PlatformOpenAI, groups[0].Platform)
+	s.Require().Equal(service.PlatformOpenAI, groups[0].Platform)
 }

 func (s *GroupRepoSuite) TestListWithFilters_Status() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1", Status: model.StatusActive})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2", Status: model.StatusDisabled})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1", Status: service.StatusActive})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2", Status: service.StatusDisabled})

-	groups, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", model.StatusDisabled, nil)
+	groups, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", service.StatusDisabled, nil)
 	s.Require().NoError(err)
 	s.Require().Len(groups, 1)
-	s.Require().Equal(model.StatusDisabled, groups[0].Status)
+	s.Require().Equal(service.StatusDisabled, groups[0].Status)
 }

 func (s *GroupRepoSuite) TestListWithFilters_IsExclusive() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1", IsExclusive: false})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2", IsExclusive: true})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1", IsExclusive: false})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2", IsExclusive: true})

 	isExclusive := true
 	groups, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", &isExclusive)
@@ -118,24 +118,24 @@ func (s *GroupRepoSuite) TestListWithFilters_IsExclusive() {
 }

 func (s *GroupRepoSuite) TestListWithFilters_AccountCount() {
-	g1 := mustCreateGroup(s.T(), s.db, &model.Group{
+	g1 := mustCreateGroup(s.T(), s.db, &groupModel{
 		Name:     "g1",
-		Platform: model.PlatformAnthropic,
-		Status:   model.StatusActive,
+		Platform: service.PlatformAnthropic,
+		Status:   service.StatusActive,
 	})
-	g2 := mustCreateGroup(s.T(), s.db, &model.Group{
+	g2 := mustCreateGroup(s.T(), s.db, &groupModel{
 		Name:        "g2",
-		Platform:    model.PlatformAnthropic,
-		Status:      model.StatusActive,
+		Platform:    service.PlatformAnthropic,
+		Status:      service.StatusActive,
 		IsExclusive: true,
 	})

-	a := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc1"})
+	a := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc1"})
 	mustBindAccountToGroup(s.T(), s.db, a.ID, g1.ID, 1)
 	mustBindAccountToGroup(s.T(), s.db, a.ID, g2.ID, 1)

 	isExclusive := true
-	groups, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.PlatformAnthropic, model.StatusActive, &isExclusive)
+	groups, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.PlatformAnthropic, service.StatusActive, &isExclusive)
 	s.Require().NoError(err, "ListWithFilters")
 	s.Require().Equal(int64(1), page.Total)
 	s.Require().Len(groups, 1)
@@ -146,8 +146,8 @@ func (s *GroupRepoSuite) TestListWithFilters_AccountCount() {
 // --- ListActive / ListActiveByPlatform ---

 func (s *GroupRepoSuite) TestListActive() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "active1", Status: model.StatusActive})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "inactive1", Status: model.StatusDisabled})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "active1", Status: service.StatusActive})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "inactive1", Status: service.StatusDisabled})

 	groups, err := s.repo.ListActive(s.ctx)
 	s.Require().NoError(err, "ListActive")
@@ -156,11 +156,11 @@ func (s *GroupRepoSuite) TestListActive() {
 }

 func (s *GroupRepoSuite) TestListActiveByPlatform() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g1", Platform: model.PlatformAnthropic, Status: model.StatusActive})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g2", Platform: model.PlatformOpenAI, Status: model.StatusActive})
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "g3", Platform: model.PlatformAnthropic, Status: model.StatusDisabled})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g1", Platform: service.PlatformAnthropic, Status: service.StatusActive})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g2", Platform: service.PlatformOpenAI, Status: service.StatusActive})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "g3", Platform: service.PlatformAnthropic, Status: service.StatusDisabled})

-	groups, err := s.repo.ListActiveByPlatform(s.ctx, model.PlatformAnthropic)
+	groups, err := s.repo.ListActiveByPlatform(s.ctx, service.PlatformAnthropic)
 	s.Require().NoError(err, "ListActiveByPlatform")
 	s.Require().Len(groups, 1)
 	s.Require().Equal("g1", groups[0].Name)
@@ -169,7 +169,7 @@ func (s *GroupRepoSuite) TestListActiveByPlatform() {
 // --- ExistsByName ---

 func (s *GroupRepoSuite) TestExistsByName() {
-	mustCreateGroup(s.T(), s.db, &model.Group{Name: "existing-group"})
+	mustCreateGroup(s.T(), s.db, &groupModel{Name: "existing-group"})

 	exists, err := s.repo.ExistsByName(s.ctx, "existing-group")
 	s.Require().NoError(err, "ExistsByName")
@@ -183,9 +183,9 @@ func (s *GroupRepoSuite) TestExistsByName() {
 // --- GetAccountCount ---

 func (s *GroupRepoSuite) TestGetAccountCount() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-count"})
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1"})
-	a2 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-count"})
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1"})
+	a2 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2"})
 	mustBindAccountToGroup(s.T(), s.db, a1.ID, group.ID, 1)
 	mustBindAccountToGroup(s.T(), s.db, a2.ID, group.ID, 2)

@@ -195,7 +195,7 @@ func (s *GroupRepoSuite) TestGetAccountCount() {
 }

 func (s *GroupRepoSuite) TestGetAccountCount_Empty() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-empty"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-empty"})

 	count, err := s.repo.GetAccountCount(s.ctx, group.ID)
 	s.Require().NoError(err)
@@ -205,8 +205,8 @@ func (s *GroupRepoSuite) TestGetAccountCount_Empty() {
 // --- DeleteAccountGroupsByGroupID ---

 func (s *GroupRepoSuite) TestDeleteAccountGroupsByGroupID() {
-	g := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-del"})
-	a := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-del"})
+	g := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-del"})
+	a := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-del"})
 	mustBindAccountToGroup(s.T(), s.db, a.ID, g.ID, 1)

 	affected, err := s.repo.DeleteAccountGroupsByGroupID(s.ctx, g.ID)
@@ -219,10 +219,10 @@ func (s *GroupRepoSuite) TestDeleteAccountGroupsByGroupID() {
 }

 func (s *GroupRepoSuite) TestDeleteAccountGroupsByGroupID_MultipleAccounts() {
-	g := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-multi"})
-	a1 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1"})
-	a2 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2"})
-	a3 := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a3"})
+	g := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-multi"})
+	a1 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1"})
+	a2 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2"})
+	a3 := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a3"})
 	mustBindAccountToGroup(s.T(), s.db, a1.ID, g.ID, 1)
 	mustBindAccountToGroup(s.T(), s.db, a2.ID, g.ID, 2)
 	mustBindAccountToGroup(s.T(), s.db, a3.ID, g.ID, 3)
--- a/backend/internal/repository/integration_harness_test.go
+++ b/backend/internal/repository/integration_harness_test.go
@@ -15,7 +15,6 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
@@ -94,7 +93,7 @@ func TestMain(m *testing.M) {
 		log.Printf("failed to open gorm db: %v", err)
 		os.Exit(1)
 	}
-	if err := model.AutoMigrate(integrationDB); err != nil {
+	if err := AutoMigrate(integrationDB); err != nil {
 		log.Printf("failed to automigrate db: %v", err)
 		os.Exit(1)
 	}
--- a/backend/internal/repository/pagination.go
+++ b/backend/internal/repository/pagination.go
@@ -0,0 +1,16 @@
+package repository
+
+import "github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+
+func paginationResultFromTotal(total int64, params pagination.PaginationParams) *pagination.PaginationResult {
+	pages := int(total) / params.Limit()
+	if int(total)%params.Limit() > 0 {
+		pages++
+	}
+	return &pagination.PaginationResult{
+		Total:    total,
+		Page:     params.Page,
+		PageSize: params.Limit(),
+		Pages:    pages,
+	}
+}
--- a/backend/internal/repository/proxy_repo.go
+++ b/backend/internal/repository/proxy_repo.go
@@ -2,10 +2,10 @@ package repository

 import (
 	"context"
+	"time"

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"

 	"gorm.io/gorm"
@@ -19,37 +19,47 @@ func NewProxyRepository(db *gorm.DB) service.ProxyRepository {
 	return &proxyRepository{db: db}
 }

-func (r *proxyRepository) Create(ctx context.Context, proxy *model.Proxy) error {
-	return r.db.WithContext(ctx).Create(proxy).Error
+func (r *proxyRepository) Create(ctx context.Context, proxy *service.Proxy) error {
+	m := proxyModelFromService(proxy)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyProxyModelToService(proxy, m)
+	}
+	return err
 }

-func (r *proxyRepository) GetByID(ctx context.Context, id int64) (*model.Proxy, error) {
-	var proxy model.Proxy
-	err := r.db.WithContext(ctx).First(&proxy, id).Error
+func (r *proxyRepository) GetByID(ctx context.Context, id int64) (*service.Proxy, error) {
+	var m proxyModel
+	err := r.db.WithContext(ctx).First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrProxyNotFound, nil)
 	}
-	return &proxy, nil
+	return proxyModelToService(&m), nil
 }

-func (r *proxyRepository) Update(ctx context.Context, proxy *model.Proxy) error {
-	return r.db.WithContext(ctx).Save(proxy).Error
+func (r *proxyRepository) Update(ctx context.Context, proxy *service.Proxy) error {
+	m := proxyModelFromService(proxy)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyProxyModelToService(proxy, m)
+	}
+	return err
 }

 func (r *proxyRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.Proxy{}, id).Error
+	return r.db.WithContext(ctx).Delete(&proxyModel{}, id).Error
 }

-func (r *proxyRepository) List(ctx context.Context, params pagination.PaginationParams) ([]model.Proxy, *pagination.PaginationResult, error) {
+func (r *proxyRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.Proxy, *pagination.PaginationResult, error) {
 	return r.ListWithFilters(ctx, params, "", "", "")
 }

 // ListWithFilters lists proxies with optional filtering by protocol, status, and search query
-func (r *proxyRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, protocol, status, search string) ([]model.Proxy, *pagination.PaginationResult, error) {
-	var proxies []model.Proxy
+func (r *proxyRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, protocol, status, search string) ([]service.Proxy, *pagination.PaginationResult, error) {
+	var proxies []proxyModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.Proxy{})
+	db := r.db.WithContext(ctx).Model(&proxyModel{})

 	// Apply filters
 	if protocol != "" {
@@ -71,29 +81,31 @@ func (r *proxyRepository) ListWithFilters(ctx context.Context, params pagination
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	outProxies := make([]service.Proxy, 0, len(proxies))
+	for i := range proxies {
+		outProxies = append(outProxies, *proxyModelToService(&proxies[i]))
 	}

-	return proxies, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outProxies, paginationResultFromTotal(total, params), nil
 }

-func (r *proxyRepository) ListActive(ctx context.Context) ([]model.Proxy, error) {
-	var proxies []model.Proxy
-	err := r.db.WithContext(ctx).Where("status = ?", model.StatusActive).Find(&proxies).Error
-	return proxies, err
+func (r *proxyRepository) ListActive(ctx context.Context) ([]service.Proxy, error) {
+	var proxies []proxyModel
+	err := r.db.WithContext(ctx).Where("status = ?", service.StatusActive).Find(&proxies).Error
+	if err != nil {
+		return nil, err
+	}
+	outProxies := make([]service.Proxy, 0, len(proxies))
+	for i := range proxies {
+		outProxies = append(outProxies, *proxyModelToService(&proxies[i]))
+	}
+	return outProxies, nil
 }

 // ExistsByHostPortAuth checks if a proxy with the same host, port, username, and password exists
 func (r *proxyRepository) ExistsByHostPortAuth(ctx context.Context, host string, port int, username, password string) (bool, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.Proxy{}).
+	err := r.db.WithContext(ctx).Model(&proxyModel{}).
 		Where("host = ? AND port = ? AND username = ? AND password = ?", host, port, username, password).
 		Count(&count).Error
 	if err != nil {
@@ -105,7 +117,7 @@ func (r *proxyRepository) ExistsByHostPortAuth(ctx context.Context, host string,
 // CountAccountsByProxyID returns the number of accounts using a specific proxy
 func (r *proxyRepository) CountAccountsByProxyID(ctx context.Context, proxyID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.Account{}).
+	err := r.db.WithContext(ctx).Table("accounts").
 		Where("proxy_id = ?", proxyID).
 		Count(&count).Error
 	return count, err
@@ -119,7 +131,7 @@ func (r *proxyRepository) GetAccountCountsForProxies(ctx context.Context) (map[i
 	}
 	var results []result
 	err := r.db.WithContext(ctx).
-		Model(&model.Account{}).
+		Table("accounts").
 		Select("proxy_id, COUNT(*) as count").
 		Where("proxy_id IS NOT NULL").
 		Group("proxy_id").
@@ -136,10 +148,10 @@ func (r *proxyRepository) GetAccountCountsForProxies(ctx context.Context) (map[i
 }

 // ListActiveWithAccountCount returns all active proxies with account count, sorted by creation time descending
-func (r *proxyRepository) ListActiveWithAccountCount(ctx context.Context) ([]model.ProxyWithAccountCount, error) {
-	var proxies []model.Proxy
+func (r *proxyRepository) ListActiveWithAccountCount(ctx context.Context) ([]service.ProxyWithAccountCount, error) {
+	var proxies []proxyModel
 	err := r.db.WithContext(ctx).
-		Where("status = ?", model.StatusActive).
+		Where("status = ?", service.StatusActive).
 		Order("created_at DESC").
 		Find(&proxies).Error
 	if err != nil {
@@ -153,13 +165,78 @@ func (r *proxyRepository) ListActiveWithAccountCount(ctx context.Context) ([]mod
 	}

 	// Build result with account counts
-	result := make([]model.ProxyWithAccountCount, len(proxies))
-	for i, proxy := range proxies {
-		result[i] = model.ProxyWithAccountCount{
-			Proxy:        proxy,
-			AccountCount: counts[proxy.ID],
+	result := make([]service.ProxyWithAccountCount, 0, len(proxies))
+	for i := range proxies {
+		proxy := proxyModelToService(&proxies[i])
+		if proxy == nil {
+			continue
 		}
+		result = append(result, service.ProxyWithAccountCount{
+			Proxy:        *proxy,
+			AccountCount: counts[proxy.ID],
+		})
 	}

 	return result, nil
 }
+
+type proxyModel struct {
+	ID        int64          `gorm:"primaryKey"`
+	Name      string         `gorm:"size:100;not null"`
+	Protocol  string         `gorm:"size:20;not null"`
+	Host      string         `gorm:"size:255;not null"`
+	Port      int            `gorm:"not null"`
+	Username  string         `gorm:"size:100"`
+	Password  string         `gorm:"size:100"`
+	Status    string         `gorm:"size:20;default:active;not null"`
+	CreatedAt time.Time      `gorm:"not null"`
+	UpdatedAt time.Time      `gorm:"not null"`
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+}
+
+func (proxyModel) TableName() string { return "proxies" }
+
+func proxyModelToService(m *proxyModel) *service.Proxy {
+	if m == nil {
+		return nil
+	}
+	return &service.Proxy{
+		ID:        m.ID,
+		Name:      m.Name,
+		Protocol:  m.Protocol,
+		Host:      m.Host,
+		Port:      m.Port,
+		Username:  m.Username,
+		Password:  m.Password,
+		Status:    m.Status,
+		CreatedAt: m.CreatedAt,
+		UpdatedAt: m.UpdatedAt,
+	}
+}
+
+func proxyModelFromService(p *service.Proxy) *proxyModel {
+	if p == nil {
+		return nil
+	}
+	return &proxyModel{
+		ID:        p.ID,
+		Name:      p.Name,
+		Protocol:  p.Protocol,
+		Host:      p.Host,
+		Port:      p.Port,
+		Username:  p.Username,
+		Password:  p.Password,
+		Status:    p.Status,
+		CreatedAt: p.CreatedAt,
+		UpdatedAt: p.UpdatedAt,
+	}
+}
+
+func applyProxyModelToService(proxy *service.Proxy, m *proxyModel) {
+	if proxy == nil || m == nil {
+		return
+	}
+	proxy.ID = m.ID
+	proxy.CreatedAt = m.CreatedAt
+	proxy.UpdatedAt = m.UpdatedAt
+}
--- a/backend/internal/repository/proxy_repo_integration_test.go
+++ b/backend/internal/repository/proxy_repo_integration_test.go
@@ -7,8 +7,8 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
 	"gorm.io/gorm"
 )
@@ -33,12 +33,12 @@ func TestProxyRepoSuite(t *testing.T) {
 // --- Create / GetByID / Update / Delete ---

 func (s *ProxyRepoSuite) TestCreate() {
-	proxy := &model.Proxy{
+	proxy := &service.Proxy{
 		Name:     "test-create",
 		Protocol: "http",
 		Host:     "127.0.0.1",
 		Port:     8080,
-		Status:   model.StatusActive,
+		Status:   service.StatusActive,
 	}

 	err := s.repo.Create(s.ctx, proxy)
@@ -56,7 +56,7 @@ func (s *ProxyRepoSuite) TestGetByID_NotFound() {
 }

 func (s *ProxyRepoSuite) TestUpdate() {
-	proxy := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "original"})
+	proxy := proxyModelToService(mustCreateProxy(s.T(), s.db, &proxyModel{Name: "original"}))

 	proxy.Name = "updated"
 	err := s.repo.Update(s.ctx, proxy)
@@ -68,7 +68,7 @@ func (s *ProxyRepoSuite) TestUpdate() {
 }

 func (s *ProxyRepoSuite) TestDelete() {
-	proxy := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "to-delete"})
+	proxy := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "to-delete"})

 	err := s.repo.Delete(s.ctx, proxy.ID)
 	s.Require().NoError(err, "Delete")
@@ -80,8 +80,8 @@ func (s *ProxyRepoSuite) TestDelete() {
 // --- List / ListWithFilters ---

 func (s *ProxyRepoSuite) TestList() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p1"})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p2"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p1"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p2"})

 	proxies, page, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "List")
@@ -90,8 +90,8 @@ func (s *ProxyRepoSuite) TestList() {
 }

 func (s *ProxyRepoSuite) TestListWithFilters_Protocol() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p1", Protocol: "http"})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p2", Protocol: "socks5"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p1", Protocol: "http"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p2", Protocol: "socks5"})

 	proxies, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "socks5", "", "")
 	s.Require().NoError(err)
@@ -100,18 +100,18 @@ func (s *ProxyRepoSuite) TestListWithFilters_Protocol() {
 }

 func (s *ProxyRepoSuite) TestListWithFilters_Status() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p1", Status: model.StatusActive})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p2", Status: model.StatusDisabled})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p1", Status: service.StatusActive})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p2", Status: service.StatusDisabled})

-	proxies, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", model.StatusDisabled, "")
+	proxies, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", service.StatusDisabled, "")
 	s.Require().NoError(err)
 	s.Require().Len(proxies, 1)
-	s.Require().Equal(model.StatusDisabled, proxies[0].Status)
+	s.Require().Equal(service.StatusDisabled, proxies[0].Status)
 }

 func (s *ProxyRepoSuite) TestListWithFilters_Search() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "production-proxy"})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "dev-proxy"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "production-proxy"})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "dev-proxy"})

 	proxies, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", "prod")
 	s.Require().NoError(err)
@@ -122,8 +122,8 @@ func (s *ProxyRepoSuite) TestListWithFilters_Search() {
 // --- ListActive ---

 func (s *ProxyRepoSuite) TestListActive() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "active1", Status: model.StatusActive})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "inactive1", Status: model.StatusDisabled})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "active1", Status: service.StatusActive})
+	mustCreateProxy(s.T(), s.db, &proxyModel{Name: "inactive1", Status: service.StatusDisabled})

 	proxies, err := s.repo.ListActive(s.ctx)
 	s.Require().NoError(err, "ListActive")
@@ -134,7 +134,7 @@ func (s *ProxyRepoSuite) TestListActive() {
 // --- ExistsByHostPortAuth ---

 func (s *ProxyRepoSuite) TestExistsByHostPortAuth() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{
+	mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:     "p1",
 		Protocol: "http",
 		Host:     "1.2.3.4",
@@ -153,7 +153,7 @@ func (s *ProxyRepoSuite) TestExistsByHostPortAuth() {
 }

 func (s *ProxyRepoSuite) TestExistsByHostPortAuth_NoAuth() {
-	mustCreateProxy(s.T(), s.db, &model.Proxy{
+	mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:     "p-noauth",
 		Protocol: "http",
 		Host:     "5.6.7.8",
@@ -170,10 +170,10 @@ func (s *ProxyRepoSuite) TestExistsByHostPortAuth_NoAuth() {
 // --- CountAccountsByProxyID ---

 func (s *ProxyRepoSuite) TestCountAccountsByProxyID() {
-	proxy := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p-count"})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", ProxyID: &proxy.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", ProxyID: &proxy.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a3"}) // no proxy
+	proxy := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p-count"})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", ProxyID: &proxy.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", ProxyID: &proxy.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a3"}) // no proxy

 	count, err := s.repo.CountAccountsByProxyID(s.ctx, proxy.ID)
 	s.Require().NoError(err, "CountAccountsByProxyID")
@@ -181,7 +181,7 @@ func (s *ProxyRepoSuite) TestCountAccountsByProxyID() {
 }

 func (s *ProxyRepoSuite) TestCountAccountsByProxyID_Zero() {
-	proxy := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p-zero"})
+	proxy := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p-zero"})

 	count, err := s.repo.CountAccountsByProxyID(s.ctx, proxy.ID)
 	s.Require().NoError(err)
@@ -191,12 +191,12 @@ func (s *ProxyRepoSuite) TestCountAccountsByProxyID_Zero() {
 // --- GetAccountCountsForProxies ---

 func (s *ProxyRepoSuite) TestGetAccountCountsForProxies() {
-	p1 := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p1"})
-	p2 := mustCreateProxy(s.T(), s.db, &model.Proxy{Name: "p2"})
+	p1 := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p1"})
+	p2 := mustCreateProxy(s.T(), s.db, &proxyModel{Name: "p2"})

-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a3", ProxyID: &p2.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a3", ProxyID: &p2.ID})

 	counts, err := s.repo.GetAccountCountsForProxies(s.ctx)
 	s.Require().NoError(err, "GetAccountCountsForProxies")
@@ -215,24 +215,24 @@ func (s *ProxyRepoSuite) TestGetAccountCountsForProxies_Empty() {
 func (s *ProxyRepoSuite) TestListActiveWithAccountCount() {
 	base := time.Date(2025, 1, 1, 12, 0, 0, 0, time.UTC)

-	p1 := mustCreateProxy(s.T(), s.db, &model.Proxy{
+	p1 := mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:      "p1",
-		Status:    model.StatusActive,
+		Status:    service.StatusActive,
 		CreatedAt: base.Add(-1 * time.Hour),
 	})
-	p2 := mustCreateProxy(s.T(), s.db, &model.Proxy{
+	p2 := mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:      "p2",
-		Status:    model.StatusActive,
+		Status:    service.StatusActive,
 		CreatedAt: base,
 	})
-	mustCreateProxy(s.T(), s.db, &model.Proxy{
+	mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:   "p3-inactive",
-		Status: model.StatusDisabled,
+		Status: service.StatusDisabled,
 	})

-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a3", ProxyID: &p2.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a3", ProxyID: &p2.ID})

 	withCounts, err := s.repo.ListActiveWithAccountCount(s.ctx)
 	s.Require().NoError(err, "ListActiveWithAccountCount")
@@ -248,7 +248,7 @@ func (s *ProxyRepoSuite) TestListActiveWithAccountCount() {
 // --- Combined original test ---

 func (s *ProxyRepoSuite) TestExistsByHostPortAuth_And_AccountCountAggregates() {
-	p1 := mustCreateProxy(s.T(), s.db, &model.Proxy{
+	p1 := mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:      "p1",
 		Protocol:  "http",
 		Host:      "1.2.3.4",
@@ -258,7 +258,7 @@ func (s *ProxyRepoSuite) TestExistsByHostPortAuth_And_AccountCountAggregates() {
 		CreatedAt: time.Now().Add(-1 * time.Hour),
 		UpdatedAt: time.Now().Add(-1 * time.Hour),
 	})
-	p2 := mustCreateProxy(s.T(), s.db, &model.Proxy{
+	p2 := mustCreateProxy(s.T(), s.db, &proxyModel{
 		Name:      "p2",
 		Protocol:  "http",
 		Host:      "5.6.7.8",
@@ -273,9 +273,9 @@ func (s *ProxyRepoSuite) TestExistsByHostPortAuth_And_AccountCountAggregates() {
 	s.Require().NoError(err, "ExistsByHostPortAuth")
 	s.Require().True(exists, "expected proxy to exist")

-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a1", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a2", ProxyID: &p1.ID})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a3", ProxyID: &p2.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a1", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a2", ProxyID: &p1.ID})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a3", ProxyID: &p2.ID})

 	count1, err := s.repo.CountAccountsByProxyID(s.ctx, p1.ID)
 	s.Require().NoError(err, "CountAccountsByProxyID")
--- a/backend/internal/repository/redeem_code_repo.go
+++ b/backend/internal/repository/redeem_code_repo.go
@@ -4,10 +4,8 @@ import (
 	"context"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/service"
-
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"

 	"gorm.io/gorm"
 )
@@ -20,48 +18,61 @@ func NewRedeemCodeRepository(db *gorm.DB) service.RedeemCodeRepository {
 	return &redeemCodeRepository{db: db}
 }

-func (r *redeemCodeRepository) Create(ctx context.Context, code *model.RedeemCode) error {
-	return r.db.WithContext(ctx).Create(code).Error
+func (r *redeemCodeRepository) Create(ctx context.Context, code *service.RedeemCode) error {
+	m := redeemCodeModelFromService(code)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyRedeemCodeModelToService(code, m)
+	}
+	return err
 }

-func (r *redeemCodeRepository) CreateBatch(ctx context.Context, codes []model.RedeemCode) error {
-	return r.db.WithContext(ctx).Create(&codes).Error
+func (r *redeemCodeRepository) CreateBatch(ctx context.Context, codes []service.RedeemCode) error {
+	if len(codes) == 0 {
+		return nil
+	}
+	models := make([]redeemCodeModel, 0, len(codes))
+	for i := range codes {
+		m := redeemCodeModelFromService(&codes[i])
+		if m != nil {
+			models = append(models, *m)
+		}
+	}
+	return r.db.WithContext(ctx).Create(&models).Error
 }

-func (r *redeemCodeRepository) GetByID(ctx context.Context, id int64) (*model.RedeemCode, error) {
-	var code model.RedeemCode
-	err := r.db.WithContext(ctx).First(&code, id).Error
+func (r *redeemCodeRepository) GetByID(ctx context.Context, id int64) (*service.RedeemCode, error) {
+	var m redeemCodeModel
+	err := r.db.WithContext(ctx).First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrRedeemCodeNotFound, nil)
 	}
-	return &code, nil
+	return redeemCodeModelToService(&m), nil
 }

-func (r *redeemCodeRepository) GetByCode(ctx context.Context, code string) (*model.RedeemCode, error) {
-	var redeemCode model.RedeemCode
-	err := r.db.WithContext(ctx).Where("code = ?", code).First(&redeemCode).Error
+func (r *redeemCodeRepository) GetByCode(ctx context.Context, code string) (*service.RedeemCode, error) {
+	var m redeemCodeModel
+	err := r.db.WithContext(ctx).Where("code = ?", code).First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrRedeemCodeNotFound, nil)
 	}
-	return &redeemCode, nil
+	return redeemCodeModelToService(&m), nil
 }

 func (r *redeemCodeRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.RedeemCode{}, id).Error
+	return r.db.WithContext(ctx).Delete(&redeemCodeModel{}, id).Error
 }

-func (r *redeemCodeRepository) List(ctx context.Context, params pagination.PaginationParams) ([]model.RedeemCode, *pagination.PaginationResult, error) {
+func (r *redeemCodeRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.RedeemCode, *pagination.PaginationResult, error) {
 	return r.ListWithFilters(ctx, params, "", "", "")
 }

-// ListWithFilters lists redeem codes with optional filtering by type, status, and search query
-func (r *redeemCodeRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, codeType, status, search string) ([]model.RedeemCode, *pagination.PaginationResult, error) {
-	var codes []model.RedeemCode
+func (r *redeemCodeRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, codeType, status, search string) ([]service.RedeemCode, *pagination.PaginationResult, error) {
+	var codes []redeemCodeModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.RedeemCode{})
+	db := r.db.WithContext(ctx).Model(&redeemCodeModel{})

-	// Apply filters
 	if codeType != "" {
 		db = db.Where("type = ?", codeType)
 	}
@@ -81,29 +92,29 @@ func (r *redeemCodeRepository) ListWithFilters(ctx context.Context, params pagin
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	outCodes := make([]service.RedeemCode, 0, len(codes))
+	for i := range codes {
+		outCodes = append(outCodes, *redeemCodeModelToService(&codes[i]))
 	}

-	return codes, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outCodes, paginationResultFromTotal(total, params), nil
 }

-func (r *redeemCodeRepository) Update(ctx context.Context, code *model.RedeemCode) error {
-	return r.db.WithContext(ctx).Save(code).Error
+func (r *redeemCodeRepository) Update(ctx context.Context, code *service.RedeemCode) error {
+	m := redeemCodeModelFromService(code)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyRedeemCodeModelToService(code, m)
+	}
+	return err
 }

 func (r *redeemCodeRepository) Use(ctx context.Context, id, userID int64) error {
 	now := time.Now()
-	result := r.db.WithContext(ctx).Model(&model.RedeemCode{}).
-		Where("id = ? AND status = ?", id, model.StatusUnused).
+	result := r.db.WithContext(ctx).Model(&redeemCodeModel{}).
+		Where("id = ? AND status = ?", id, service.StatusUnused).
 		Updates(map[string]any{
-			"status":  model.StatusUsed,
+			"status":  service.StatusUsed,
 			"used_by": userID,
 			"used_at": now,
 		})
@@ -116,22 +127,93 @@ func (r *redeemCodeRepository) Use(ctx context.Context, id, userID int64) error
 	return nil
 }

-// ListByUser returns all redeem codes used by a specific user
-func (r *redeemCodeRepository) ListByUser(ctx context.Context, userID int64, limit int) ([]model.RedeemCode, error) {
-	var codes []model.RedeemCode
+func (r *redeemCodeRepository) ListByUser(ctx context.Context, userID int64, limit int) ([]service.RedeemCode, error) {
 	if limit <= 0 {
 		limit = 10
 	}

+	var codes []redeemCodeModel
 	err := r.db.WithContext(ctx).
 		Preload("Group").
 		Where("used_by = ?", userID).
 		Order("used_at DESC").
 		Limit(limit).
 		Find(&codes).Error
-
 	if err != nil {
 		return nil, err
 	}
-	return codes, nil
+
+	outCodes := make([]service.RedeemCode, 0, len(codes))
+	for i := range codes {
+		outCodes = append(outCodes, *redeemCodeModelToService(&codes[i]))
+	}
+	return outCodes, nil
+}
+
+type redeemCodeModel struct {
+	ID        int64   `gorm:"primaryKey"`
+	Code      string  `gorm:"uniqueIndex;size:32;not null"`
+	Type      string  `gorm:"size:20;default:balance;not null"`
+	Value     float64 `gorm:"type:decimal(20,8);not null"`
+	Status    string  `gorm:"size:20;default:unused;not null"`
+	UsedBy    *int64  `gorm:"index"`
+	UsedAt    *time.Time
+	Notes     string    `gorm:"type:text"`
+	CreatedAt time.Time `gorm:"not null"`
+
+	GroupID      *int64 `gorm:"index"`
+	ValidityDays int    `gorm:"default:30"`
+
+	User  *userModel  `gorm:"foreignKey:UsedBy"`
+	Group *groupModel `gorm:"foreignKey:GroupID"`
+}
+
+func (redeemCodeModel) TableName() string { return "redeem_codes" }
+
+func redeemCodeModelToService(m *redeemCodeModel) *service.RedeemCode {
+	if m == nil {
+		return nil
+	}
+	return &service.RedeemCode{
+		ID:           m.ID,
+		Code:         m.Code,
+		Type:         m.Type,
+		Value:        m.Value,
+		Status:       m.Status,
+		UsedBy:       m.UsedBy,
+		UsedAt:       m.UsedAt,
+		Notes:        m.Notes,
+		CreatedAt:    m.CreatedAt,
+		GroupID:      m.GroupID,
+		ValidityDays: m.ValidityDays,
+		User:         userModelToService(m.User),
+		Group:        groupModelToService(m.Group),
+	}
+}
+
+func redeemCodeModelFromService(r *service.RedeemCode) *redeemCodeModel {
+	if r == nil {
+		return nil
+	}
+	return &redeemCodeModel{
+		ID:           r.ID,
+		Code:         r.Code,
+		Type:         r.Type,
+		Value:        r.Value,
+		Status:       r.Status,
+		UsedBy:       r.UsedBy,
+		UsedAt:       r.UsedAt,
+		Notes:        r.Notes,
+		CreatedAt:    r.CreatedAt,
+		GroupID:      r.GroupID,
+		ValidityDays: r.ValidityDays,
+	}
+}
+
+func applyRedeemCodeModelToService(code *service.RedeemCode, m *redeemCodeModel) {
+	if code == nil || m == nil {
+		return
+	}
+	code.ID = m.ID
+	code.CreatedAt = m.CreatedAt
 }
--- a/backend/internal/repository/redeem_code_repo_integration_test.go
+++ b/backend/internal/repository/redeem_code_repo_integration_test.go
@@ -7,7 +7,6 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
@@ -34,11 +33,11 @@ func TestRedeemCodeRepoSuite(t *testing.T) {
 // --- Create / CreateBatch / GetByID / GetByCode ---

 func (s *RedeemCodeRepoSuite) TestCreate() {
-	code := &model.RedeemCode{
+	code := &service.RedeemCode{
 		Code:   "TEST-CREATE",
-		Type:   model.RedeemTypeBalance,
+		Type:   service.RedeemTypeBalance,
 		Value:  100,
-		Status: model.StatusUnused,
+		Status: service.StatusUnused,
 	}

 	err := s.repo.Create(s.ctx, code)
@@ -51,9 +50,9 @@ func (s *RedeemCodeRepoSuite) TestCreate() {
 }

 func (s *RedeemCodeRepoSuite) TestCreateBatch() {
-	codes := []model.RedeemCode{
-		{Code: "BATCH-1", Type: model.RedeemTypeBalance, Value: 10, Status: model.StatusUnused},
-		{Code: "BATCH-2", Type: model.RedeemTypeBalance, Value: 20, Status: model.StatusUnused},
+	codes := []service.RedeemCode{
+		{Code: "BATCH-1", Type: service.RedeemTypeBalance, Value: 10, Status: service.StatusUnused},
+		{Code: "BATCH-2", Type: service.RedeemTypeBalance, Value: 20, Status: service.StatusUnused},
 	}

 	err := s.repo.CreateBatch(s.ctx, codes)
@@ -74,7 +73,7 @@ func (s *RedeemCodeRepoSuite) TestGetByID_NotFound() {
 }

 func (s *RedeemCodeRepoSuite) TestGetByCode() {
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "GET-BY-CODE", Type: model.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "GET-BY-CODE", Type: service.RedeemTypeBalance})

 	got, err := s.repo.GetByCode(s.ctx, "GET-BY-CODE")
 	s.Require().NoError(err, "GetByCode")
@@ -89,7 +88,7 @@ func (s *RedeemCodeRepoSuite) TestGetByCode_NotFound() {
 // --- Delete ---

 func (s *RedeemCodeRepoSuite) TestDelete() {
-	code := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "TO-DELETE", Type: model.RedeemTypeBalance})
+	code := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "TO-DELETE", Type: service.RedeemTypeBalance})

 	err := s.repo.Delete(s.ctx, code.ID)
 	s.Require().NoError(err, "Delete")
@@ -101,8 +100,8 @@ func (s *RedeemCodeRepoSuite) TestDelete() {
 // --- List / ListWithFilters ---

 func (s *RedeemCodeRepoSuite) TestList() {
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "LIST-1", Type: model.RedeemTypeBalance})
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "LIST-2", Type: model.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "LIST-1", Type: service.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "LIST-2", Type: service.RedeemTypeBalance})

 	codes, page, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "List")
@@ -111,28 +110,28 @@ func (s *RedeemCodeRepoSuite) TestList() {
 }

 func (s *RedeemCodeRepoSuite) TestListWithFilters_Type() {
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "TYPE-BAL", Type: model.RedeemTypeBalance})
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "TYPE-SUB", Type: model.RedeemTypeSubscription})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "TYPE-BAL", Type: service.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "TYPE-SUB", Type: service.RedeemTypeSubscription})

-	codes, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.RedeemTypeSubscription, "", "")
+	codes, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.RedeemTypeSubscription, "", "")
 	s.Require().NoError(err)
 	s.Require().Len(codes, 1)
-	s.Require().Equal(model.RedeemTypeSubscription, codes[0].Type)
+	s.Require().Equal(service.RedeemTypeSubscription, codes[0].Type)
 }

 func (s *RedeemCodeRepoSuite) TestListWithFilters_Status() {
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "STAT-UNUSED", Type: model.RedeemTypeBalance, Status: model.StatusUnused})
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "STAT-USED", Type: model.RedeemTypeBalance, Status: model.StatusUsed})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "STAT-UNUSED", Type: service.RedeemTypeBalance, Status: service.StatusUnused})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "STAT-USED", Type: service.RedeemTypeBalance, Status: service.StatusUsed})

-	codes, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", model.StatusUsed, "")
+	codes, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", service.StatusUsed, "")
 	s.Require().NoError(err)
 	s.Require().Len(codes, 1)
-	s.Require().Equal(model.StatusUsed, codes[0].Status)
+	s.Require().Equal(service.StatusUsed, codes[0].Status)
 }

 func (s *RedeemCodeRepoSuite) TestListWithFilters_Search() {
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "ALPHA-CODE", Type: model.RedeemTypeBalance})
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "BETA-CODE", Type: model.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "ALPHA-CODE", Type: service.RedeemTypeBalance})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "BETA-CODE", Type: service.RedeemTypeBalance})

 	codes, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", "alpha")
 	s.Require().NoError(err)
@@ -141,10 +140,10 @@ func (s *RedeemCodeRepoSuite) TestListWithFilters_Search() {
 }

 func (s *RedeemCodeRepoSuite) TestListWithFilters_GroupPreload() {
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-preload"})
-	mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-preload"})
+	mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{
 		Code:    "WITH-GROUP",
-		Type:    model.RedeemTypeSubscription,
+		Type:    service.RedeemTypeSubscription,
 		GroupID: &group.ID,
 	})

@@ -158,7 +157,7 @@ func (s *RedeemCodeRepoSuite) TestListWithFilters_GroupPreload() {
 // --- Update ---

 func (s *RedeemCodeRepoSuite) TestUpdate() {
-	code := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "UPDATE-ME", Type: model.RedeemTypeBalance, Value: 10})
+	code := redeemCodeModelToService(mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "UPDATE-ME", Type: service.RedeemTypeBalance, Value: 10}))

 	code.Value = 50
 	err := s.repo.Update(s.ctx, code)
@@ -172,23 +171,23 @@ func (s *RedeemCodeRepoSuite) TestUpdate() {
 // --- Use ---

 func (s *RedeemCodeRepoSuite) TestUse() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "use@test.com"})
-	code := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "USE-ME", Type: model.RedeemTypeBalance, Status: model.StatusUnused})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "use@test.com"})
+	code := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "USE-ME", Type: service.RedeemTypeBalance, Status: service.StatusUnused})

 	err := s.repo.Use(s.ctx, code.ID, user.ID)
 	s.Require().NoError(err, "Use")

 	got, err := s.repo.GetByID(s.ctx, code.ID)
 	s.Require().NoError(err)
-	s.Require().Equal(model.StatusUsed, got.Status)
+	s.Require().Equal(service.StatusUsed, got.Status)
 	s.Require().NotNil(got.UsedBy)
 	s.Require().Equal(user.ID, *got.UsedBy)
 	s.Require().NotNil(got.UsedAt)
 }

 func (s *RedeemCodeRepoSuite) TestUse_Idempotency() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "idem@test.com"})
-	code := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "IDEM-CODE", Type: model.RedeemTypeBalance, Status: model.StatusUnused})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "idem@test.com"})
+	code := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "IDEM-CODE", Type: service.RedeemTypeBalance, Status: service.StatusUnused})

 	err := s.repo.Use(s.ctx, code.ID, user.ID)
 	s.Require().NoError(err, "Use first time")
@@ -200,8 +199,8 @@ func (s *RedeemCodeRepoSuite) TestUse_Idempotency() {
 }

 func (s *RedeemCodeRepoSuite) TestUse_AlreadyUsed() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "already@test.com"})
-	code := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{Code: "ALREADY-USED", Type: model.RedeemTypeBalance, Status: model.StatusUsed})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "already@test.com"})
+	code := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{Code: "ALREADY-USED", Type: service.RedeemTypeBalance, Status: service.StatusUsed})

 	err := s.repo.Use(s.ctx, code.ID, user.ID)
 	s.Require().Error(err, "expected error for already used code")
@@ -211,22 +210,22 @@ func (s *RedeemCodeRepoSuite) TestUse_AlreadyUsed() {
 // --- ListByUser ---

 func (s *RedeemCodeRepoSuite) TestListByUser() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listby@test.com"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listby@test.com"})
 	base := time.Date(2025, 1, 1, 12, 0, 0, 0, time.UTC)

 	// Create codes with explicit used_at for ordering
-	c1 := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{
+	c1 := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{
 		Code:   "USER-1",
-		Type:   model.RedeemTypeBalance,
-		Status: model.StatusUsed,
+		Type:   service.RedeemTypeBalance,
+		Status: service.StatusUsed,
 		UsedBy: &user.ID,
 	})
 	s.db.Model(c1).Update("used_at", base)

-	c2 := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{
+	c2 := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{
 		Code:   "USER-2",
-		Type:   model.RedeemTypeBalance,
-		Status: model.StatusUsed,
+		Type:   service.RedeemTypeBalance,
+		Status: service.StatusUsed,
 		UsedBy: &user.ID,
 	})
 	s.db.Model(c2).Update("used_at", base.Add(1*time.Hour))
@@ -240,13 +239,13 @@ func (s *RedeemCodeRepoSuite) TestListByUser() {
 }

 func (s *RedeemCodeRepoSuite) TestListByUser_WithGroupPreload() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "grp@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-listby"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "grp@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-listby"})

-	c := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{
+	c := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{
 		Code:    "WITH-GRP",
-		Type:    model.RedeemTypeSubscription,
-		Status:  model.StatusUsed,
+		Type:    service.RedeemTypeSubscription,
+		Status:  service.StatusUsed,
 		UsedBy:  &user.ID,
 		GroupID: &group.ID,
 	})
@@ -260,11 +259,11 @@ func (s *RedeemCodeRepoSuite) TestListByUser_WithGroupPreload() {
 }

 func (s *RedeemCodeRepoSuite) TestListByUser_DefaultLimit() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "deflimit@test.com"})
-	c := mustCreateRedeemCode(s.T(), s.db, &model.RedeemCode{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "deflimit@test.com"})
+	c := mustCreateRedeemCode(s.T(), s.db, &redeemCodeModel{
 		Code:   "DEF-LIM",
-		Type:   model.RedeemTypeBalance,
-		Status: model.StatusUsed,
+		Type:   service.RedeemTypeBalance,
+		Status: service.StatusUsed,
 		UsedBy: &user.ID,
 	})
 	s.db.Model(c).Update("used_at", time.Now())
@@ -278,16 +277,16 @@ func (s *RedeemCodeRepoSuite) TestListByUser_DefaultLimit() {
 // --- Combined original test ---

 func (s *RedeemCodeRepoSuite) TestCreateBatch_Filters_Use_Idempotency_ListByUser() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "rc@example.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-rc"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "rc@example.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-rc"})

-	codes := []model.RedeemCode{
-		{Code: "CODEA", Type: model.RedeemTypeBalance, Value: 1, Status: model.StatusUnused, CreatedAt: time.Now()},
-		{Code: "CODEB", Type: model.RedeemTypeSubscription, Value: 0, Status: model.StatusUnused, GroupID: &group.ID, ValidityDays: 7, CreatedAt: time.Now()},
+	codes := []service.RedeemCode{
+		{Code: "CODEA", Type: service.RedeemTypeBalance, Value: 1, Status: service.StatusUnused, CreatedAt: time.Now()},
+		{Code: "CODEB", Type: service.RedeemTypeSubscription, Value: 0, Status: service.StatusUnused, GroupID: &group.ID, ValidityDays: 7, CreatedAt: time.Now()},
 	}
 	s.Require().NoError(s.repo.CreateBatch(s.ctx, codes), "CreateBatch")

-	list, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.RedeemTypeSubscription, model.StatusUnused, "code")
+	list, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.RedeemTypeSubscription, service.StatusUnused, "code")
 	s.Require().NoError(err, "ListWithFilters")
 	s.Require().Equal(int64(1), page.Total)
 	s.Require().Len(list, 1)
@@ -305,9 +304,9 @@ func (s *RedeemCodeRepoSuite) TestCreateBatch_Filters_Use_Idempotency_ListByUser
 	s.Require().NoError(err, "GetByCode")

 	// Use fixed time instead of time.Sleep for deterministic ordering
-	s.db.Model(&model.RedeemCode{}).Where("id = ?", codeB.ID).Update("used_at", time.Date(2025, 1, 1, 12, 0, 0, 0, time.UTC))
+	s.db.Model(&redeemCodeModel{}).Where("id = ?", codeB.ID).Update("used_at", time.Date(2025, 1, 1, 12, 0, 0, 0, time.UTC))
 	s.Require().NoError(s.repo.Use(s.ctx, codeA.ID, user.ID), "Use codeA")
-	s.db.Model(&model.RedeemCode{}).Where("id = ?", codeA.ID).Update("used_at", time.Date(2025, 1, 1, 13, 0, 0, 0, time.UTC))
+	s.db.Model(&redeemCodeModel{}).Where("id = ?", codeA.ID).Update("used_at", time.Date(2025, 1, 1, 13, 0, 0, 0, time.UTC))

 	used, err := s.repo.ListByUser(s.ctx, user.ID, 10)
 	s.Require().NoError(err, "ListByUser")
--- a/backend/internal/repository/setting_repo.go
+++ b/backend/internal/repository/setting_repo.go
@@ -6,33 +6,27 @@ import (

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
-
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
 )

-// SettingRepository 系统设置数据访问层
 type settingRepository struct {
 	db *gorm.DB
 }

-// NewSettingRepository 创建系统设置仓库实例
 func NewSettingRepository(db *gorm.DB) service.SettingRepository {
 	return &settingRepository{db: db}
 }

-// Get 根据Key获取设置值
-func (r *settingRepository) Get(ctx context.Context, key string) (*model.Setting, error) {
-	var setting model.Setting
-	err := r.db.WithContext(ctx).Where("key = ?", key).First(&setting).Error
+func (r *settingRepository) Get(ctx context.Context, key string) (*service.Setting, error) {
+	var m settingModel
+	err := r.db.WithContext(ctx).Where("key = ?", key).First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrSettingNotFound, nil)
 	}
-	return &setting, nil
+	return settingModelToService(&m), nil
 }

-// GetValue 获取设置值字符串
 func (r *settingRepository) GetValue(ctx context.Context, key string) (string, error) {
 	setting, err := r.Get(ctx, key)
 	if err != nil {
@@ -41,9 +35,8 @@ func (r *settingRepository) GetValue(ctx context.Context, key string) (string, e
 	return setting.Value, nil
 }

-// Set 设置值（存在则更新，不存在则创建）
 func (r *settingRepository) Set(ctx context.Context, key, value string) error {
-	setting := &model.Setting{
+	m := &settingModel{
 		Key:       key,
 		Value:     value,
 		UpdatedAt: time.Now(),
@@ -52,12 +45,11 @@ func (r *settingRepository) Set(ctx context.Context, key, value string) error {
 	return r.db.WithContext(ctx).Clauses(clause.OnConflict{
 		Columns:   []clause.Column{{Name: "key"}},
 		DoUpdates: clause.AssignmentColumns([]string{"value", "updated_at"}),
-	}).Create(setting).Error
+	}).Create(m).Error
 }

-// GetMultiple 批量获取设置
 func (r *settingRepository) GetMultiple(ctx context.Context, keys []string) (map[string]string, error) {
-	var settings []model.Setting
+	var settings []settingModel
 	err := r.db.WithContext(ctx).Where("key IN ?", keys).Find(&settings).Error
 	if err != nil {
 		return nil, err
@@ -70,11 +62,10 @@ func (r *settingRepository) GetMultiple(ctx context.Context, keys []string) (map
 	return result, nil
 }

-// SetMultiple 批量设置值
 func (r *settingRepository) SetMultiple(ctx context.Context, settings map[string]string) error {
 	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		for key, value := range settings {
-			setting := &model.Setting{
+			m := &settingModel{
 				Key:       key,
 				Value:     value,
 				UpdatedAt: time.Now(),
@@ -82,7 +73,7 @@ func (r *settingRepository) SetMultiple(ctx context.Context, settings map[string
 			if err := tx.Clauses(clause.OnConflict{
 				Columns:   []clause.Column{{Name: "key"}},
 				DoUpdates: clause.AssignmentColumns([]string{"value", "updated_at"}),
-			}).Create(setting).Error; err != nil {
+			}).Create(m).Error; err != nil {
 				return err
 			}
 		}
@@ -90,9 +81,8 @@ func (r *settingRepository) SetMultiple(ctx context.Context, settings map[string
 	})
 }

-// GetAll 获取所有设置
 func (r *settingRepository) GetAll(ctx context.Context) (map[string]string, error) {
-	var settings []model.Setting
+	var settings []settingModel
 	err := r.db.WithContext(ctx).Find(&settings).Error
 	if err != nil {
 		return nil, err
@@ -105,7 +95,27 @@ func (r *settingRepository) GetAll(ctx context.Context) (map[string]string, erro
 	return result, nil
 }

-// Delete 删除设置
 func (r *settingRepository) Delete(ctx context.Context, key string) error {
-	return r.db.WithContext(ctx).Where("key = ?", key).Delete(&model.Setting{}).Error
+	return r.db.WithContext(ctx).Where("key = ?", key).Delete(&settingModel{}).Error
+}
+
+type settingModel struct {
+	ID        int64     `gorm:"primaryKey"`
+	Key       string    `gorm:"uniqueIndex;size:100;not null"`
+	Value     string    `gorm:"type:text;not null"`
+	UpdatedAt time.Time `gorm:"not null"`
+}
+
+func (settingModel) TableName() string { return "settings" }
+
+func settingModelToService(m *settingModel) *service.Setting {
+	if m == nil {
+		return nil
+	}
+	return &service.Setting{
+		ID:        m.ID,
+		Key:       m.Key,
+		Value:     m.Value,
+		UpdatedAt: m.UpdatedAt,
+	}
 }
--- a/backend/internal/repository/usage_log_repo.go
+++ b/backend/internal/repository/usage_log_repo.go
@@ -6,7 +6,6 @@ import (

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
@@ -30,7 +29,7 @@ func (r *usageLogRepository) getPerformanceStats(ctx context.Context, userID int
 		TokenCount   int64 `gorm:"column:token_count"`
 	}

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as request_count,
 			COALESCE(SUM(input_tokens + output_tokens), 0) as token_count
@@ -46,24 +45,29 @@ func (r *usageLogRepository) getPerformanceStats(ctx context.Context, userID int
 	return perfStats.RequestCount / 5, perfStats.TokenCount / 5
 }

-func (r *usageLogRepository) Create(ctx context.Context, log *model.UsageLog) error {
-	return r.db.WithContext(ctx).Create(log).Error
+func (r *usageLogRepository) Create(ctx context.Context, log *service.UsageLog) error {
+	m := usageLogModelFromService(log)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyUsageLogModelToService(log, m)
+	}
+	return err
 }

-func (r *usageLogRepository) GetByID(ctx context.Context, id int64) (*model.UsageLog, error) {
-	var log model.UsageLog
+func (r *usageLogRepository) GetByID(ctx context.Context, id int64) (*service.UsageLog, error) {
+	var log usageLogModel
 	err := r.db.WithContext(ctx).First(&log, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrUsageLogNotFound, nil)
 	}
-	return &log, nil
+	return usageLogModelToService(&log), nil
 }

-func (r *usageLogRepository) ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).Where("user_id = ?", userID)
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).Where("user_id = ?", userID)

 	if err := db.Count(&total).Error; err != nil {
 		return nil, nil, err
@@ -73,24 +77,14 @@ func (r *usageLogRepository) ListByUser(ctx context.Context, userID int64, param
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return logs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return usageLogModelsToService(logs), paginationResultFromTotal(total, params), nil
 }

-func (r *usageLogRepository) ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).Where("api_key_id = ?", apiKeyID)
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).Where("api_key_id = ?", apiKeyID)

 	if err := db.Count(&total).Error; err != nil {
 		return nil, nil, err
@@ -100,17 +94,7 @@ func (r *usageLogRepository) ListByApiKey(ctx context.Context, apiKeyID int64, p
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return logs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return usageLogModelsToService(logs), paginationResultFromTotal(total, params), nil
 }

 // UserStats 用户使用统计
@@ -125,7 +109,7 @@ type UserStats struct {

 func (r *usageLogRepository) GetUserStats(ctx context.Context, userID int64, startTime, endTime time.Time) (*UserStats, error) {
 	var stats UserStats
-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as total_requests,
 			COALESCE(SUM(input_tokens + output_tokens + cache_creation_tokens + cache_read_tokens), 0) as total_tokens,
@@ -147,47 +131,47 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 	today := timezone.Today()

 	// 总用户数
-	r.db.WithContext(ctx).Model(&model.User{}).Count(&stats.TotalUsers)
+	r.db.WithContext(ctx).Model(&userModel{}).Count(&stats.TotalUsers)

 	// 今日新增用户数
-	r.db.WithContext(ctx).Model(&model.User{}).
+	r.db.WithContext(ctx).Model(&userModel{}).
 		Where("created_at >= ?", today).
 		Count(&stats.TodayNewUsers)

 	// 今日活跃用户数 (今日有请求的用户)
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Distinct("user_id").
 		Where("created_at >= ?", today).
 		Count(&stats.ActiveUsers)

 	// 总 API Key 数
-	r.db.WithContext(ctx).Model(&model.ApiKey{}).Count(&stats.TotalApiKeys)
+	r.db.WithContext(ctx).Model(&apiKeyModel{}).Count(&stats.TotalApiKeys)

 	// 活跃 API Key 数
-	r.db.WithContext(ctx).Model(&model.ApiKey{}).
-		Where("status = ?", model.StatusActive).
+	r.db.WithContext(ctx).Model(&apiKeyModel{}).
+		Where("status = ?", service.StatusActive).
 		Count(&stats.ActiveApiKeys)

 	// 总账户数
-	r.db.WithContext(ctx).Model(&model.Account{}).Count(&stats.TotalAccounts)
+	r.db.WithContext(ctx).Model(&accountModel{}).Count(&stats.TotalAccounts)

 	// 正常账户数 (schedulable=true, status=active)
-	r.db.WithContext(ctx).Model(&model.Account{}).
-		Where("status = ? AND schedulable = ?", model.StatusActive, true).
+	r.db.WithContext(ctx).Model(&accountModel{}).
+		Where("status = ? AND schedulable = ?", service.StatusActive, true).
 		Count(&stats.NormalAccounts)

 	// 异常账户数 (status=error)
-	r.db.WithContext(ctx).Model(&model.Account{}).
-		Where("status = ?", model.StatusError).
+	r.db.WithContext(ctx).Model(&accountModel{}).
+		Where("status = ?", service.StatusError).
 		Count(&stats.ErrorAccounts)

 	// 限流账户数
-	r.db.WithContext(ctx).Model(&model.Account{}).
+	r.db.WithContext(ctx).Model(&accountModel{}).
 		Where("rate_limited_at IS NOT NULL AND rate_limit_reset_at > ?", time.Now()).
 		Count(&stats.RateLimitAccounts)

 	// 过载账户数
-	r.db.WithContext(ctx).Model(&model.Account{}).
+	r.db.WithContext(ctx).Model(&accountModel{}).
 		Where("overload_until IS NOT NULL AND overload_until > ?", time.Now()).
 		Count(&stats.OverloadAccounts)

@@ -202,7 +186,7 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 		TotalActualCost          float64 `gorm:"column:total_actual_cost"`
 		AverageDurationMs        float64 `gorm:"column:avg_duration_ms"`
 	}
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as total_requests,
 			COALESCE(SUM(input_tokens), 0) as total_input_tokens,
@@ -235,7 +219,7 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 		TodayCost                float64 `gorm:"column:today_cost"`
 		TodayActualCost          float64 `gorm:"column:today_actual_cost"`
 	}
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as today_requests,
 			COALESCE(SUM(input_tokens), 0) as today_input_tokens,
@@ -263,11 +247,11 @@ func (r *usageLogRepository) GetDashboardStats(ctx context.Context) (*DashboardS
 	return &stats, nil
 }

-func (r *usageLogRepository) ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).Where("account_id = ?", accountID)
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).Where("account_id = ?", accountID)

 	if err := db.Count(&total).Error; err != nil {
 		return nil, nil, err
@@ -277,57 +261,47 @@ func (r *usageLogRepository) ListByAccount(ctx context.Context, accountID int64,
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return logs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return usageLogModelsToService(logs), paginationResultFromTotal(total, params), nil
 }

-func (r *usageLogRepository) ListByUserAndTimeRange(ctx context.Context, userID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByUserAndTimeRange(ctx context.Context, userID int64, startTime, endTime time.Time) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	err := r.db.WithContext(ctx).
 		Where("user_id = ? AND created_at >= ? AND created_at < ?", userID, startTime, endTime).
 		Order("id DESC").
 		Find(&logs).Error
-	return logs, nil, err
+	return usageLogModelsToService(logs), nil, err
 }

-func (r *usageLogRepository) ListByApiKeyAndTimeRange(ctx context.Context, apiKeyID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByApiKeyAndTimeRange(ctx context.Context, apiKeyID int64, startTime, endTime time.Time) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	err := r.db.WithContext(ctx).
 		Where("api_key_id = ? AND created_at >= ? AND created_at < ?", apiKeyID, startTime, endTime).
 		Order("id DESC").
 		Find(&logs).Error
-	return logs, nil, err
+	return usageLogModelsToService(logs), nil, err
 }

-func (r *usageLogRepository) ListByAccountAndTimeRange(ctx context.Context, accountID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByAccountAndTimeRange(ctx context.Context, accountID int64, startTime, endTime time.Time) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	err := r.db.WithContext(ctx).
 		Where("account_id = ? AND created_at >= ? AND created_at < ?", accountID, startTime, endTime).
 		Order("id DESC").
 		Find(&logs).Error
-	return logs, nil, err
+	return usageLogModelsToService(logs), nil, err
 }

-func (r *usageLogRepository) ListByModelAndTimeRange(ctx context.Context, modelName string, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListByModelAndTimeRange(ctx context.Context, modelName string, startTime, endTime time.Time) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	err := r.db.WithContext(ctx).
 		Where("model = ? AND created_at >= ? AND created_at < ?", modelName, startTime, endTime).
 		Order("id DESC").
 		Find(&logs).Error
-	return logs, nil, err
+	return usageLogModelsToService(logs), nil, err
 }

 func (r *usageLogRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.UsageLog{}, id).Error
+	return r.db.WithContext(ctx).Delete(&usageLogModel{}, id).Error
 }

 // GetAccountTodayStats 获取账号今日统计
@@ -340,7 +314,7 @@ func (r *usageLogRepository) GetAccountTodayStats(ctx context.Context, accountID
 		Cost     float64 `gorm:"column:cost"`
 	}

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as requests,
 			COALESCE(SUM(input_tokens + output_tokens + cache_creation_tokens + cache_read_tokens), 0) as tokens,
@@ -368,7 +342,7 @@ func (r *usageLogRepository) GetAccountWindowStats(ctx context.Context, accountI
 		Cost     float64 `gorm:"column:cost"`
 	}

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as requests,
 			COALESCE(SUM(input_tokens + output_tokens + cache_creation_tokens + cache_read_tokens), 0) as tokens,
@@ -499,12 +473,12 @@ func (r *usageLogRepository) GetUserDashboardStats(ctx context.Context, userID i
 	today := timezone.Today()

 	// API Key 统计
-	r.db.WithContext(ctx).Model(&model.ApiKey{}).
+	r.db.WithContext(ctx).Model(&apiKeyModel{}).
 		Where("user_id = ?", userID).
 		Count(&stats.TotalApiKeys)

-	r.db.WithContext(ctx).Model(&model.ApiKey{}).
-		Where("user_id = ? AND status = ?", userID, model.StatusActive).
+	r.db.WithContext(ctx).Model(&apiKeyModel{}).
+		Where("user_id = ? AND status = ?", userID, service.StatusActive).
 		Count(&stats.ActiveApiKeys)

 	// 累计 Token 统计
@@ -518,7 +492,7 @@ func (r *usageLogRepository) GetUserDashboardStats(ctx context.Context, userID i
 		TotalActualCost          float64 `gorm:"column:total_actual_cost"`
 		AverageDurationMs        float64 `gorm:"column:avg_duration_ms"`
 	}
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as total_requests,
 			COALESCE(SUM(input_tokens), 0) as total_input_tokens,
@@ -552,7 +526,7 @@ func (r *usageLogRepository) GetUserDashboardStats(ctx context.Context, userID i
 		TodayCost                float64 `gorm:"column:today_cost"`
 		TodayActualCost          float64 `gorm:"column:today_actual_cost"`
 	}
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as today_requests,
 			COALESCE(SUM(input_tokens), 0) as today_input_tokens,
@@ -591,7 +565,7 @@ func (r *usageLogRepository) GetUserUsageTrendByUserID(ctx context.Context, user
 		dateFormat = "YYYY-MM-DD"
 	}

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			TO_CHAR(created_at, ?) as date,
 			COUNT(*) as requests,
@@ -618,7 +592,7 @@ func (r *usageLogRepository) GetUserUsageTrendByUserID(ctx context.Context, user
 func (r *usageLogRepository) GetUserModelStats(ctx context.Context, userID int64, startTime, endTime time.Time) ([]ModelStat, error) {
 	var results []ModelStat

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			model,
 			COUNT(*) as requests,
@@ -644,11 +618,11 @@ func (r *usageLogRepository) GetUserModelStats(ctx context.Context, userID int64
 type UsageLogFilters = usagestats.UsageLogFilters

 // ListWithFilters lists usage logs with optional filters (for admin)
-func (r *usageLogRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters UsageLogFilters) ([]model.UsageLog, *pagination.PaginationResult, error) {
-	var logs []model.UsageLog
+func (r *usageLogRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters UsageLogFilters) ([]service.UsageLog, *pagination.PaginationResult, error) {
+	var logs []usageLogModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{})
+	db := r.db.WithContext(ctx).Model(&usageLogModel{})

 	// Apply filters
 	if filters.UserID > 0 {
@@ -675,17 +649,7 @@ func (r *usageLogRepository) ListWithFilters(ctx context.Context, params paginat
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return logs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return usageLogModelsToService(logs), paginationResultFromTotal(total, params), nil
 }

 // UsageStats represents usage statistics
@@ -713,7 +677,7 @@ func (r *usageLogRepository) GetBatchUserUsageStats(ctx context.Context, userIDs
 		UserID    int64   `gorm:"column:user_id"`
 		TotalCost float64 `gorm:"column:total_cost"`
 	}
-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select("user_id, COALESCE(SUM(actual_cost), 0) as total_cost").
 		Where("user_id IN ?", userIDs).
 		Group("user_id").
@@ -733,7 +697,7 @@ func (r *usageLogRepository) GetBatchUserUsageStats(ctx context.Context, userIDs
 		UserID    int64   `gorm:"column:user_id"`
 		TodayCost float64 `gorm:"column:today_cost"`
 	}
-	err = r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err = r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select("user_id, COALESCE(SUM(actual_cost), 0) as today_cost").
 		Where("user_id IN ? AND created_at >= ?", userIDs, today).
 		Group("user_id").
@@ -773,7 +737,7 @@ func (r *usageLogRepository) GetBatchApiKeyUsageStats(ctx context.Context, apiKe
 		ApiKeyID  int64   `gorm:"column:api_key_id"`
 		TotalCost float64 `gorm:"column:total_cost"`
 	}
-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select("api_key_id, COALESCE(SUM(actual_cost), 0) as total_cost").
 		Where("api_key_id IN ?", apiKeyIDs).
 		Group("api_key_id").
@@ -793,7 +757,7 @@ func (r *usageLogRepository) GetBatchApiKeyUsageStats(ctx context.Context, apiKe
 		ApiKeyID  int64   `gorm:"column:api_key_id"`
 		TodayCost float64 `gorm:"column:today_cost"`
 	}
-	err = r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err = r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select("api_key_id, COALESCE(SUM(actual_cost), 0) as today_cost").
 		Where("api_key_id IN ? AND created_at >= ?", apiKeyIDs, today).
 		Group("api_key_id").
@@ -822,7 +786,7 @@ func (r *usageLogRepository) GetUsageTrendWithFilters(ctx context.Context, start
 		dateFormat = "YYYY-MM-DD"
 	}

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			TO_CHAR(created_at, ?) as date,
 			COUNT(*) as requests,
@@ -854,7 +818,7 @@ func (r *usageLogRepository) GetUsageTrendWithFilters(ctx context.Context, start
 func (r *usageLogRepository) GetModelStatsWithFilters(ctx context.Context, startTime, endTime time.Time, userID, apiKeyID, accountID int64) ([]ModelStat, error) {
 	var results []ModelStat

-	db := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	db := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			model,
 			COUNT(*) as requests,
@@ -896,7 +860,7 @@ func (r *usageLogRepository) GetGlobalStats(ctx context.Context, startTime, endT
 		AverageDurationMs float64 `gorm:"column:avg_duration_ms"`
 	}

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			COUNT(*) as total_requests,
 			COALESCE(SUM(input_tokens), 0) as total_input_tokens,
@@ -950,7 +914,7 @@ func (r *usageLogRepository) GetAccountUsageStats(ctx context.Context, accountID
 		ActualCost float64 `gorm:"column:actual_cost"`
 	}

-	err := r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	err := r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select(`
 			TO_CHAR(created_at, 'YYYY-MM-DD') as date,
 			COUNT(*) as requests,
@@ -1011,7 +975,7 @@ func (r *usageLogRepository) GetAccountUsageStats(ctx context.Context, accountID
 	var avgDuration struct {
 		AvgDurationMs float64 `gorm:"column:avg_duration_ms"`
 	}
-	r.db.WithContext(ctx).Model(&model.UsageLog{}).
+	r.db.WithContext(ctx).Model(&usageLogModel{}).
 		Select("COALESCE(AVG(duration_ms), 0) as avg_duration_ms").
 		Where("account_id = ? AND created_at >= ? AND created_at < ?", accountID, startTime, endTime).
 		Scan(&avgDuration)
@@ -1090,3 +1054,137 @@ func (r *usageLogRepository) GetAccountUsageStats(ctx context.Context, accountID
 		Models:  models,
 	}, nil
 }
+
+type usageLogModel struct {
+	ID        int64  `gorm:"primaryKey"`
+	UserID    int64  `gorm:"index;not null"`
+	ApiKeyID  int64  `gorm:"index;not null"`
+	AccountID int64  `gorm:"index;not null"`
+	RequestID string `gorm:"size:64"`
+	Model     string `gorm:"size:100;index;not null"`
+
+	GroupID        *int64 `gorm:"index"`
+	SubscriptionID *int64 `gorm:"index"`
+
+	InputTokens         int `gorm:"default:0;not null"`
+	OutputTokens        int `gorm:"default:0;not null"`
+	CacheCreationTokens int `gorm:"default:0;not null"`
+	CacheReadTokens     int `gorm:"default:0;not null"`
+
+	CacheCreation5mTokens int `gorm:"default:0;not null"`
+	CacheCreation1hTokens int `gorm:"default:0;not null"`
+
+	InputCost         float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	OutputCost        float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	CacheCreationCost float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	CacheReadCost     float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	TotalCost         float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	ActualCost        float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	RateMultiplier    float64 `gorm:"type:decimal(10,4);default:1;not null"`
+
+	BillingType  int8 `gorm:"type:smallint;default:0;not null"`
+	Stream       bool `gorm:"default:false;not null"`
+	DurationMs   *int
+	FirstTokenMs *int
+
+	CreatedAt time.Time `gorm:"index;not null"`
+
+	User         *userModel             `gorm:"foreignKey:UserID"`
+	ApiKey       *apiKeyModel           `gorm:"foreignKey:ApiKeyID"`
+	Account      *accountModel          `gorm:"foreignKey:AccountID"`
+	Group        *groupModel            `gorm:"foreignKey:GroupID"`
+	Subscription *userSubscriptionModel `gorm:"foreignKey:SubscriptionID"`
+}
+
+func (usageLogModel) TableName() string { return "usage_logs" }
+
+func usageLogModelToService(m *usageLogModel) *service.UsageLog {
+	if m == nil {
+		return nil
+	}
+	return &service.UsageLog{
+		ID:                    m.ID,
+		UserID:                m.UserID,
+		ApiKeyID:              m.ApiKeyID,
+		AccountID:             m.AccountID,
+		RequestID:             m.RequestID,
+		Model:                 m.Model,
+		GroupID:               m.GroupID,
+		SubscriptionID:        m.SubscriptionID,
+		InputTokens:           m.InputTokens,
+		OutputTokens:          m.OutputTokens,
+		CacheCreationTokens:   m.CacheCreationTokens,
+		CacheReadTokens:       m.CacheReadTokens,
+		CacheCreation5mTokens: m.CacheCreation5mTokens,
+		CacheCreation1hTokens: m.CacheCreation1hTokens,
+		InputCost:             m.InputCost,
+		OutputCost:            m.OutputCost,
+		CacheCreationCost:     m.CacheCreationCost,
+		CacheReadCost:         m.CacheReadCost,
+		TotalCost:             m.TotalCost,
+		ActualCost:            m.ActualCost,
+		RateMultiplier:        m.RateMultiplier,
+		BillingType:           m.BillingType,
+		Stream:                m.Stream,
+		DurationMs:            m.DurationMs,
+		FirstTokenMs:          m.FirstTokenMs,
+		CreatedAt:             m.CreatedAt,
+		User:                  userModelToService(m.User),
+		ApiKey:                apiKeyModelToService(m.ApiKey),
+		Account:               accountModelToService(m.Account),
+		Group:                 groupModelToService(m.Group),
+		Subscription:          userSubscriptionModelToService(m.Subscription),
+	}
+}
+
+func usageLogModelsToService(models []usageLogModel) []service.UsageLog {
+	out := make([]service.UsageLog, 0, len(models))
+	for i := range models {
+		if s := usageLogModelToService(&models[i]); s != nil {
+			out = append(out, *s)
+		}
+	}
+	return out
+}
+
+func usageLogModelFromService(log *service.UsageLog) *usageLogModel {
+	if log == nil {
+		return nil
+	}
+	return &usageLogModel{
+		ID:                    log.ID,
+		UserID:                log.UserID,
+		ApiKeyID:              log.ApiKeyID,
+		AccountID:             log.AccountID,
+		RequestID:             log.RequestID,
+		Model:                 log.Model,
+		GroupID:               log.GroupID,
+		SubscriptionID:        log.SubscriptionID,
+		InputTokens:           log.InputTokens,
+		OutputTokens:          log.OutputTokens,
+		CacheCreationTokens:   log.CacheCreationTokens,
+		CacheReadTokens:       log.CacheReadTokens,
+		CacheCreation5mTokens: log.CacheCreation5mTokens,
+		CacheCreation1hTokens: log.CacheCreation1hTokens,
+		InputCost:             log.InputCost,
+		OutputCost:            log.OutputCost,
+		CacheCreationCost:     log.CacheCreationCost,
+		CacheReadCost:         log.CacheReadCost,
+		TotalCost:             log.TotalCost,
+		ActualCost:            log.ActualCost,
+		RateMultiplier:        log.RateMultiplier,
+		BillingType:           log.BillingType,
+		Stream:                log.Stream,
+		DurationMs:            log.DurationMs,
+		FirstTokenMs:          log.FirstTokenMs,
+		CreatedAt:             log.CreatedAt,
+	}
+}
+
+func applyUsageLogModelToService(log *service.UsageLog, m *usageLogModel) {
+	if log == nil || m == nil {
+		return
+	}
+	log.ID = m.ID
+	log.CreatedAt = m.CreatedAt
+}
--- a/backend/internal/repository/usage_log_repo_integration_test.go
+++ b/backend/internal/repository/usage_log_repo_integration_test.go
@@ -7,10 +7,10 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
 	"gorm.io/gorm"
 )
@@ -32,8 +32,8 @@ func TestUsageLogRepoSuite(t *testing.T) {
 	suite.Run(t, new(UsageLogRepoSuite))
 }

-func (s *UsageLogRepoSuite) createUsageLog(user *model.User, apiKey *model.ApiKey, account *model.Account, inputTokens, outputTokens int, cost float64, createdAt time.Time) *model.UsageLog {
-	log := &model.UsageLog{
+func (s *UsageLogRepoSuite) createUsageLog(user *userModel, apiKey *apiKeyModel, account *accountModel, inputTokens, outputTokens int, cost float64, createdAt time.Time) *service.UsageLog {
+	log := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -51,11 +51,11 @@ func (s *UsageLogRepoSuite) createUsageLog(user *model.User, apiKey *model.ApiKe
 // --- Create / GetByID ---

 func (s *UsageLogRepoSuite) TestCreate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "create@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-create", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-create"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "create@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-create", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-create"})

-	log := &model.UsageLog{
+	log := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -72,9 +72,9 @@ func (s *UsageLogRepoSuite) TestCreate() {
 }

 func (s *UsageLogRepoSuite) TestGetByID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "getbyid@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-getbyid", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-getbyid"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "getbyid@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-getbyid", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-getbyid"})

 	log := s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -92,9 +92,9 @@ func (s *UsageLogRepoSuite) TestGetByID_NotFound() {
 // --- Delete ---

 func (s *UsageLogRepoSuite) TestDelete() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "delete@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-delete", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-delete"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "delete@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-delete", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-delete"})

 	log := s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -108,9 +108,9 @@ func (s *UsageLogRepoSuite) TestDelete() {
 // --- ListByUser ---

 func (s *UsageLogRepoSuite) TestListByUser() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listbyuser@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-listbyuser", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-listbyuser"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listbyuser@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-listbyuser", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-listbyuser"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())
 	s.createUsageLog(user, apiKey, account, 15, 25, 0.6, time.Now())
@@ -124,9 +124,9 @@ func (s *UsageLogRepoSuite) TestListByUser() {
 // --- ListByApiKey ---

 func (s *UsageLogRepoSuite) TestListByApiKey() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listbyapikey@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-listbyapikey", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-listbyapikey"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listbyapikey@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-listbyapikey", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-listbyapikey"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())
 	s.createUsageLog(user, apiKey, account, 15, 25, 0.6, time.Now())
@@ -140,9 +140,9 @@ func (s *UsageLogRepoSuite) TestListByApiKey() {
 // --- ListByAccount ---

 func (s *UsageLogRepoSuite) TestListByAccount() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listbyaccount@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-listbyaccount", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-listbyaccount"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listbyaccount@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-listbyaccount", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-listbyaccount"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -155,9 +155,9 @@ func (s *UsageLogRepoSuite) TestListByAccount() {
 // --- GetUserStats ---

 func (s *UsageLogRepoSuite) TestGetUserStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "userstats@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-userstats", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-userstats"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "userstats@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-userstats", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-userstats"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -175,9 +175,9 @@ func (s *UsageLogRepoSuite) TestGetUserStats() {
 // --- ListWithFilters ---

 func (s *UsageLogRepoSuite) TestListWithFilters() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "filters@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-filters", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-filters"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "filters@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-filters", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-filters"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -194,29 +194,29 @@ func (s *UsageLogRepoSuite) TestDashboardStats_TodayTotalsAndPerformance() {
 	now := time.Now()
 	todayStart := timezone.Today()

-	userToday := mustCreateUser(s.T(), s.db, &model.User{
+	userToday := mustCreateUser(s.T(), s.db, &userModel{
 		Email:     "today@example.com",
 		CreatedAt: maxTime(todayStart.Add(10*time.Second), now.Add(-10*time.Second)),
 		UpdatedAt: now,
 	})
-	userOld := mustCreateUser(s.T(), s.db, &model.User{
+	userOld := mustCreateUser(s.T(), s.db, &userModel{
 		Email:     "old@example.com",
 		CreatedAt: todayStart.Add(-24 * time.Hour),
 		UpdatedAt: todayStart.Add(-24 * time.Hour),
 	})

-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-ul"})
-	apiKey1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: userToday.ID, Key: "sk-ul-1", Name: "ul1"})
-	mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: userOld.ID, Key: "sk-ul-2", Name: "ul2", Status: model.StatusDisabled})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-ul"})
+	apiKey1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: userToday.ID, Key: "sk-ul-1", Name: "ul1"})
+	mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: userOld.ID, Key: "sk-ul-2", Name: "ul2", Status: service.StatusDisabled})

 	resetAt := now.Add(10 * time.Minute)
-	accNormal := mustCreateAccount(s.T(), s.db, &model.Account{Name: "a-normal", Schedulable: true})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a-error", Status: model.StatusError, Schedulable: true})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a-rl", RateLimitedAt: &now, RateLimitResetAt: &resetAt, Schedulable: true})
-	mustCreateAccount(s.T(), s.db, &model.Account{Name: "a-ov", OverloadUntil: &resetAt, Schedulable: true})
+	accNormal := mustCreateAccount(s.T(), s.db, &accountModel{Name: "a-normal", Schedulable: true})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a-error", Status: service.StatusError, Schedulable: true})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a-rl", RateLimitedAt: &now, RateLimitResetAt: &resetAt, Schedulable: true})
+	mustCreateAccount(s.T(), s.db, &accountModel{Name: "a-ov", OverloadUntil: &resetAt, Schedulable: true})

 	d1, d2, d3 := 100, 200, 300
-	logToday := &model.UsageLog{
+	logToday := &service.UsageLog{
 		UserID:              userToday.ID,
 		ApiKeyID:            apiKey1.ID,
 		AccountID:           accNormal.ID,
@@ -233,7 +233,7 @@ func (s *UsageLogRepoSuite) TestDashboardStats_TodayTotalsAndPerformance() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, logToday), "Create logToday")

-	logOld := &model.UsageLog{
+	logOld := &service.UsageLog{
 		UserID:       userOld.ID,
 		ApiKeyID:     apiKey1.ID,
 		AccountID:    accNormal.ID,
@@ -247,7 +247,7 @@ func (s *UsageLogRepoSuite) TestDashboardStats_TodayTotalsAndPerformance() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, logOld), "Create logOld")

-	logPerf := &model.UsageLog{
+	logPerf := &service.UsageLog{
 		UserID:       userToday.ID,
 		ApiKeyID:     apiKey1.ID,
 		AccountID:    accNormal.ID,
@@ -293,9 +293,9 @@ func (s *UsageLogRepoSuite) TestDashboardStats_TodayTotalsAndPerformance() {
 // --- GetUserDashboardStats ---

 func (s *UsageLogRepoSuite) TestGetUserDashboardStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "userdash@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-userdash", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-userdash"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "userdash@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-userdash", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-userdash"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -308,9 +308,9 @@ func (s *UsageLogRepoSuite) TestGetUserDashboardStats() {
 // --- GetAccountTodayStats ---

 func (s *UsageLogRepoSuite) TestGetAccountTodayStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "acctoday@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-acctoday", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-today"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "acctoday@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-acctoday", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-today"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -323,11 +323,11 @@ func (s *UsageLogRepoSuite) TestGetAccountTodayStats() {
 // --- GetBatchUserUsageStats ---

 func (s *UsageLogRepoSuite) TestGetBatchUserUsageStats() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "batch1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "batch2@test.com"})
-	apiKey1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user1.ID, Key: "sk-batch1", Name: "k"})
-	apiKey2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user2.ID, Key: "sk-batch2", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-batch"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "batch1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "batch2@test.com"})
+	apiKey1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user1.ID, Key: "sk-batch1", Name: "k"})
+	apiKey2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user2.ID, Key: "sk-batch2", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-batch"})

 	s.createUsageLog(user1, apiKey1, account, 10, 20, 0.5, time.Now())
 	s.createUsageLog(user2, apiKey2, account, 15, 25, 0.6, time.Now())
@@ -348,10 +348,10 @@ func (s *UsageLogRepoSuite) TestGetBatchUserUsageStats_Empty() {
 // --- GetBatchApiKeyUsageStats ---

 func (s *UsageLogRepoSuite) TestGetBatchApiKeyUsageStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "batchkey@test.com"})
-	apiKey1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-batchkey1", Name: "k1"})
-	apiKey2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-batchkey2", Name: "k2"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-batchkey"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "batchkey@test.com"})
+	apiKey1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-batchkey1", Name: "k1"})
+	apiKey2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-batchkey2", Name: "k2"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-batchkey"})

 	s.createUsageLog(user, apiKey1, account, 10, 20, 0.5, time.Now())
 	s.createUsageLog(user, apiKey2, account, 15, 25, 0.6, time.Now())
@@ -370,9 +370,9 @@ func (s *UsageLogRepoSuite) TestGetBatchApiKeyUsageStats_Empty() {
 // --- GetGlobalStats ---

 func (s *UsageLogRepoSuite) TestGetGlobalStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "global@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-global", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-global"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "global@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-global", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-global"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -395,9 +395,9 @@ func maxTime(a, b time.Time) time.Time {
 // --- ListByUserAndTimeRange ---

 func (s *UsageLogRepoSuite) TestListByUserAndTimeRange() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "timerange@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-timerange", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-timerange"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "timerange@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-timerange", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-timerange"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -414,9 +414,9 @@ func (s *UsageLogRepoSuite) TestListByUserAndTimeRange() {
 // --- ListByApiKeyAndTimeRange ---

 func (s *UsageLogRepoSuite) TestListByApiKeyAndTimeRange() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "keytimerange@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-keytimerange", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-keytimerange"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "keytimerange@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-keytimerange", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-keytimerange"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -433,9 +433,9 @@ func (s *UsageLogRepoSuite) TestListByApiKeyAndTimeRange() {
 // --- ListByAccountAndTimeRange ---

 func (s *UsageLogRepoSuite) TestListByAccountAndTimeRange() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "acctimerange@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-acctimerange", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-acctimerange"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "acctimerange@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-acctimerange", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-acctimerange"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -452,14 +452,14 @@ func (s *UsageLogRepoSuite) TestListByAccountAndTimeRange() {
 // --- ListByModelAndTimeRange ---

 func (s *UsageLogRepoSuite) TestListByModelAndTimeRange() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "modeltimerange@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-modeltimerange", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-modeltimerange"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "modeltimerange@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-modeltimerange", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-modeltimerange"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)

 	// Create logs with different models
-	log1 := &model.UsageLog{
+	log1 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -472,7 +472,7 @@ func (s *UsageLogRepoSuite) TestListByModelAndTimeRange() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, log1))

-	log2 := &model.UsageLog{
+	log2 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -485,7 +485,7 @@ func (s *UsageLogRepoSuite) TestListByModelAndTimeRange() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, log2))

-	log3 := &model.UsageLog{
+	log3 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -508,9 +508,9 @@ func (s *UsageLogRepoSuite) TestListByModelAndTimeRange() {
 // --- GetAccountWindowStats ---

 func (s *UsageLogRepoSuite) TestGetAccountWindowStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "windowstats@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-windowstats", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-windowstats"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "windowstats@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-windowstats", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-windowstats"})

 	now := time.Now()
 	windowStart := now.Add(-10 * time.Minute)
@@ -528,9 +528,9 @@ func (s *UsageLogRepoSuite) TestGetAccountWindowStats() {
 // --- GetUserUsageTrendByUserID ---

 func (s *UsageLogRepoSuite) TestGetUserUsageTrendByUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "usertrend@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-usertrend", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-usertrend"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "usertrend@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-usertrend", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-usertrend"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -545,9 +545,9 @@ func (s *UsageLogRepoSuite) TestGetUserUsageTrendByUserID() {
 }

 func (s *UsageLogRepoSuite) TestGetUserUsageTrendByUserID_HourlyGranularity() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "usertrendhourly@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-usertrendhourly", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-usertrendhourly"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "usertrendhourly@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-usertrendhourly", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-usertrendhourly"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -564,14 +564,14 @@ func (s *UsageLogRepoSuite) TestGetUserUsageTrendByUserID_HourlyGranularity() {
 // --- GetUserModelStats ---

 func (s *UsageLogRepoSuite) TestGetUserModelStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "modelstats@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-modelstats", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-modelstats"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "modelstats@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-modelstats", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-modelstats"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)

 	// Create logs with different models
-	log1 := &model.UsageLog{
+	log1 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -584,7 +584,7 @@ func (s *UsageLogRepoSuite) TestGetUserModelStats() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, log1))

-	log2 := &model.UsageLog{
+	log2 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -611,9 +611,9 @@ func (s *UsageLogRepoSuite) TestGetUserModelStats() {
 // --- GetUsageTrendWithFilters ---

 func (s *UsageLogRepoSuite) TestGetUsageTrendWithFilters() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "trendfilters@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-trendfilters", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-trendfilters"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "trendfilters@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-trendfilters", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-trendfilters"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -639,9 +639,9 @@ func (s *UsageLogRepoSuite) TestGetUsageTrendWithFilters() {
 }

 func (s *UsageLogRepoSuite) TestGetUsageTrendWithFilters_HourlyGranularity() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "trendfilters-h@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-trendfilters-h", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-trendfilters-h"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "trendfilters-h@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-trendfilters-h", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-trendfilters-h"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -658,13 +658,13 @@ func (s *UsageLogRepoSuite) TestGetUsageTrendWithFilters_HourlyGranularity() {
 // --- GetModelStatsWithFilters ---

 func (s *UsageLogRepoSuite) TestGetModelStatsWithFilters() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "modelfilters@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-modelfilters", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-modelfilters"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "modelfilters@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-modelfilters", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-modelfilters"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)

-	log1 := &model.UsageLog{
+	log1 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -677,7 +677,7 @@ func (s *UsageLogRepoSuite) TestGetModelStatsWithFilters() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, log1))

-	log2 := &model.UsageLog{
+	log2 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -712,14 +712,14 @@ func (s *UsageLogRepoSuite) TestGetModelStatsWithFilters() {
 // --- GetAccountUsageStats ---

 func (s *UsageLogRepoSuite) TestGetAccountUsageStats() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "accstats@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-accstats", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-accstats"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "accstats@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-accstats", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-accstats"})

 	base := time.Date(2025, 1, 15, 0, 0, 0, 0, time.UTC)

 	// Create logs on different days
-	log1 := &model.UsageLog{
+	log1 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -732,7 +732,7 @@ func (s *UsageLogRepoSuite) TestGetAccountUsageStats() {
 	}
 	s.Require().NoError(s.repo.Create(s.ctx, log1))

-	log2 := &model.UsageLog{
+	log2 := &service.UsageLog{
 		UserID:       user.ID,
 		ApiKeyID:     apiKey.ID,
 		AccountID:    account.ID,
@@ -758,7 +758,7 @@ func (s *UsageLogRepoSuite) TestGetAccountUsageStats() {
 }

 func (s *UsageLogRepoSuite) TestGetAccountUsageStats_EmptyRange() {
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-emptystats"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-emptystats"})

 	base := time.Date(2025, 1, 15, 0, 0, 0, 0, time.UTC)
 	startTime := base
@@ -774,11 +774,11 @@ func (s *UsageLogRepoSuite) TestGetAccountUsageStats_EmptyRange() {
 // --- GetUserUsageTrend ---

 func (s *UsageLogRepoSuite) TestGetUserUsageTrend() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "usertrend1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "usertrend2@test.com"})
-	apiKey1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user1.ID, Key: "sk-usertrend1", Name: "k1"})
-	apiKey2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user2.ID, Key: "sk-usertrend2", Name: "k2"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-usertrends"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "usertrend1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "usertrend2@test.com"})
+	apiKey1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user1.ID, Key: "sk-usertrend1", Name: "k1"})
+	apiKey2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user2.ID, Key: "sk-usertrend2", Name: "k2"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-usertrends"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user1, apiKey1, account, 100, 200, 1.0, base)
@@ -796,10 +796,10 @@ func (s *UsageLogRepoSuite) TestGetUserUsageTrend() {
 // --- GetApiKeyUsageTrend ---

 func (s *UsageLogRepoSuite) TestGetApiKeyUsageTrend() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "keytrend@test.com"})
-	apiKey1 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-keytrend1", Name: "k1"})
-	apiKey2 := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-keytrend2", Name: "k2"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-keytrends"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "keytrend@test.com"})
+	apiKey1 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-keytrend1", Name: "k1"})
+	apiKey2 := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-keytrend2", Name: "k2"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-keytrends"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey1, account, 100, 200, 1.0, base)
@@ -815,9 +815,9 @@ func (s *UsageLogRepoSuite) TestGetApiKeyUsageTrend() {
 }

 func (s *UsageLogRepoSuite) TestGetApiKeyUsageTrend_HourlyGranularity() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "keytrendh@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-keytrendh", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-keytrendh"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "keytrendh@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-keytrendh", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-keytrendh"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 100, 200, 1.0, base)
@@ -834,9 +834,9 @@ func (s *UsageLogRepoSuite) TestGetApiKeyUsageTrend_HourlyGranularity() {
 // --- ListWithFilters (additional filter tests) ---

 func (s *UsageLogRepoSuite) TestListWithFilters_ApiKeyFilter() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "filterskey@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-filterskey", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-filterskey"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "filterskey@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-filterskey", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-filterskey"})

 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, time.Now())

@@ -848,9 +848,9 @@ func (s *UsageLogRepoSuite) TestListWithFilters_ApiKeyFilter() {
 }

 func (s *UsageLogRepoSuite) TestListWithFilters_TimeRange() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "filterstime@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-filterstime", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-filterstime"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "filterstime@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-filterstime", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-filterstime"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
@@ -867,9 +867,9 @@ func (s *UsageLogRepoSuite) TestListWithFilters_TimeRange() {
 }

 func (s *UsageLogRepoSuite) TestListWithFilters_CombinedFilters() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "filterscombined@test.com"})
-	apiKey := mustCreateApiKey(s.T(), s.db, &model.ApiKey{UserID: user.ID, Key: "sk-filterscombined", Name: "k"})
-	account := mustCreateAccount(s.T(), s.db, &model.Account{Name: "acc-filterscombined"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "filterscombined@test.com"})
+	apiKey := mustCreateApiKey(s.T(), s.db, &apiKeyModel{UserID: user.ID, Key: "sk-filterscombined", Name: "k"})
+	account := mustCreateAccount(s.T(), s.db, &accountModel{Name: "acc-filterscombined"})

 	base := time.Date(2025, 1, 15, 12, 0, 0, 0, time.UTC)
 	s.createUsageLog(user, apiKey, account, 10, 20, 0.5, base)
--- a/backend/internal/repository/user_repo.go
+++ b/backend/internal/repository/user_repo.go
@@ -2,12 +2,13 @@ package repository

 import (
 	"context"
+	"time"

 	"github.com/Wei-Shaw/sub2api/internal/service"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"

+	"github.com/lib/pq"
 	"gorm.io/gorm"
 )

@@ -19,48 +20,56 @@ func NewUserRepository(db *gorm.DB) service.UserRepository {
 	return &userRepository{db: db}
 }

-func (r *userRepository) Create(ctx context.Context, user *model.User) error {
-	err := r.db.WithContext(ctx).Create(user).Error
+func (r *userRepository) Create(ctx context.Context, user *service.User) error {
+	m := userModelFromService(user)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyUserModelToService(user, m)
+	}
 	return translatePersistenceError(err, nil, service.ErrEmailExists)
 }

-func (r *userRepository) GetByID(ctx context.Context, id int64) (*model.User, error) {
-	var user model.User
-	err := r.db.WithContext(ctx).First(&user, id).Error
+func (r *userRepository) GetByID(ctx context.Context, id int64) (*service.User, error) {
+	var m userModel
+	err := r.db.WithContext(ctx).First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrUserNotFound, nil)
 	}
-	return &user, nil
+	return userModelToService(&m), nil
 }

-func (r *userRepository) GetByEmail(ctx context.Context, email string) (*model.User, error) {
-	var user model.User
-	err := r.db.WithContext(ctx).Where("email = ?", email).First(&user).Error
+func (r *userRepository) GetByEmail(ctx context.Context, email string) (*service.User, error) {
+	var m userModel
+	err := r.db.WithContext(ctx).Where("email = ?", email).First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrUserNotFound, nil)
 	}
-	return &user, nil
+	return userModelToService(&m), nil
 }

-func (r *userRepository) Update(ctx context.Context, user *model.User) error {
-	err := r.db.WithContext(ctx).Save(user).Error
+func (r *userRepository) Update(ctx context.Context, user *service.User) error {
+	m := userModelFromService(user)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyUserModelToService(user, m)
+	}
 	return translatePersistenceError(err, nil, service.ErrEmailExists)
 }

 func (r *userRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.User{}, id).Error
+	return r.db.WithContext(ctx).Delete(&userModel{}, id).Error
 }

-func (r *userRepository) List(ctx context.Context, params pagination.PaginationParams) ([]model.User, *pagination.PaginationResult, error) {
+func (r *userRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.User, *pagination.PaginationResult, error) {
 	return r.ListWithFilters(ctx, params, "", "", "")
 }

 // ListWithFilters lists users with optional filtering by status, role, and search query
-func (r *userRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, role, search string) ([]model.User, *pagination.PaginationResult, error) {
-	var users []model.User
+func (r *userRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, role, search string) ([]service.User, *pagination.PaginationResult, error) {
+	var users []userModel
 	var total int64

-	db := r.db.WithContext(ctx).Model(&model.User{})
+	db := r.db.WithContext(ctx).Model(&userModel{})

 	// Apply filters
 	if status != "" {
@@ -89,17 +98,20 @@ func (r *userRepository) ListWithFilters(ctx context.Context, params pagination.
 	// Batch load subscriptions for all users (avoid N+1)
 	if len(users) > 0 {
 		userIDs := make([]int64, len(users))
-		userMap := make(map[int64]*model.User, len(users))
+		userMap := make(map[int64]*service.User, len(users))
+		outUsers := make([]service.User, 0, len(users))
 		for i := range users {
 			userIDs[i] = users[i].ID
-			userMap[users[i].ID] = &users[i]
+			u := userModelToService(&users[i])
+			outUsers = append(outUsers, *u)
+			userMap[u.ID] = &outUsers[len(outUsers)-1]
 		}

 		// Query active subscriptions with groups in one query
-		var subscriptions []model.UserSubscription
+		var subscriptions []userSubscriptionModel
 		if err := r.db.WithContext(ctx).
 			Preload("Group").
-			Where("user_id IN ? AND status = ?", userIDs, model.SubscriptionStatusActive).
+			Where("user_id IN ? AND status = ?", userIDs, service.SubscriptionStatusActive).
 			Find(&subscriptions).Error; err != nil {
 			return nil, nil, err
 		}
@@ -107,32 +119,29 @@ func (r *userRepository) ListWithFilters(ctx context.Context, params pagination.
 		// Associate subscriptions with users
 		for i := range subscriptions {
 			if user, ok := userMap[subscriptions[i].UserID]; ok {
-				user.Subscriptions = append(user.Subscriptions, subscriptions[i])
+				user.Subscriptions = append(user.Subscriptions, *userSubscriptionModelToService(&subscriptions[i]))
 			}
 		}
+
+		return outUsers, paginationResultFromTotal(total, params), nil
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
+	outUsers := make([]service.User, 0, len(users))
+	for i := range users {
+		outUsers = append(outUsers, *userModelToService(&users[i]))
 	}

-	return users, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return outUsers, paginationResultFromTotal(total, params), nil
 }

 func (r *userRepository) UpdateBalance(ctx context.Context, id int64, amount float64) error {
-	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&userModel{}).Where("id = ?", id).
 		Update("balance", gorm.Expr("balance + ?", amount)).Error
 }

 // DeductBalance 扣减用户余额，仅当余额充足时执行
 func (r *userRepository) DeductBalance(ctx context.Context, id int64, amount float64) error {
-	result := r.db.WithContext(ctx).Model(&model.User{}).
+	result := r.db.WithContext(ctx).Model(&userModel{}).
 		Where("id = ? AND balance >= ?", id, amount).
 		Update("balance", gorm.Expr("balance - ?", amount))
 	if result.Error != nil {
@@ -145,34 +154,104 @@ func (r *userRepository) DeductBalance(ctx context.Context, id int64, amount flo
 }

 func (r *userRepository) UpdateConcurrency(ctx context.Context, id int64, amount int) error {
-	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", id).
+	return r.db.WithContext(ctx).Model(&userModel{}).Where("id = ?", id).
 		Update("concurrency", gorm.Expr("concurrency + ?", amount)).Error
 }

 func (r *userRepository) ExistsByEmail(ctx context.Context, email string) (bool, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.User{}).Where("email = ?", email).Count(&count).Error
+	err := r.db.WithContext(ctx).Model(&userModel{}).Where("email = ?", email).Count(&count).Error
 	return count > 0, err
 }

 // RemoveGroupFromAllowedGroups 从所有用户的 allowed_groups 数组中移除指定的分组ID
 // 使用 PostgreSQL 的 array_remove 函数
 func (r *userRepository) RemoveGroupFromAllowedGroups(ctx context.Context, groupID int64) (int64, error) {
-	result := r.db.WithContext(ctx).Model(&model.User{}).
+	result := r.db.WithContext(ctx).Model(&userModel{}).
 		Where("? = ANY(allowed_groups)", groupID).
 		Update("allowed_groups", gorm.Expr("array_remove(allowed_groups, ?)", groupID))
 	return result.RowsAffected, result.Error
 }

 // GetFirstAdmin 获取第一个管理员用户（用于 Admin API Key 认证）
-func (r *userRepository) GetFirstAdmin(ctx context.Context) (*model.User, error) {
-	var user model.User
+func (r *userRepository) GetFirstAdmin(ctx context.Context) (*service.User, error) {
+	var m userModel
 	err := r.db.WithContext(ctx).
-		Where("role = ? AND status = ?", model.RoleAdmin, model.StatusActive).
+		Where("role = ? AND status = ?", service.RoleAdmin, service.StatusActive).
 		Order("id ASC").
-		First(&user).Error
+		First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrUserNotFound, nil)
 	}
-	return &user, nil
+	return userModelToService(&m), nil
+}
+
+type userModel struct {
+	ID            int64          `gorm:"primaryKey"`
+	Email         string         `gorm:"uniqueIndex;size:255;not null"`
+	Username      string         `gorm:"size:100;default:''"`
+	Wechat        string         `gorm:"size:100;default:''"`
+	Notes         string         `gorm:"type:text;default:''"`
+	PasswordHash  string         `gorm:"size:255;not null"`
+	Role          string         `gorm:"size:20;default:user;not null"`
+	Balance       float64        `gorm:"type:decimal(20,8);default:0;not null"`
+	Concurrency   int            `gorm:"default:5;not null"`
+	Status        string         `gorm:"size:20;default:active;not null"`
+	AllowedGroups pq.Int64Array  `gorm:"type:bigint[]"`
+	CreatedAt     time.Time      `gorm:"not null"`
+	UpdatedAt     time.Time      `gorm:"not null"`
+	DeletedAt     gorm.DeletedAt `gorm:"index"`
+}
+
+func (userModel) TableName() string { return "users" }
+
+func userModelToService(m *userModel) *service.User {
+	if m == nil {
+		return nil
+	}
+	return &service.User{
+		ID:            m.ID,
+		Email:         m.Email,
+		Username:      m.Username,
+		Wechat:        m.Wechat,
+		Notes:         m.Notes,
+		PasswordHash:  m.PasswordHash,
+		Role:          m.Role,
+		Balance:       m.Balance,
+		Concurrency:   m.Concurrency,
+		Status:        m.Status,
+		AllowedGroups: []int64(m.AllowedGroups),
+		CreatedAt:     m.CreatedAt,
+		UpdatedAt:     m.UpdatedAt,
+	}
+}
+
+func userModelFromService(u *service.User) *userModel {
+	if u == nil {
+		return nil
+	}
+	return &userModel{
+		ID:            u.ID,
+		Email:         u.Email,
+		Username:      u.Username,
+		Wechat:        u.Wechat,
+		Notes:         u.Notes,
+		PasswordHash:  u.PasswordHash,
+		Role:          u.Role,
+		Balance:       u.Balance,
+		Concurrency:   u.Concurrency,
+		Status:        u.Status,
+		AllowedGroups: pq.Int64Array(u.AllowedGroups),
+		CreatedAt:     u.CreatedAt,
+		UpdatedAt:     u.UpdatedAt,
+	}
+}
+
+func applyUserModelToService(dst *service.User, src *userModel) {
+	if dst == nil || src == nil {
+		return
+	}
+	dst.ID = src.ID
+	dst.CreatedAt = src.CreatedAt
+	dst.UpdatedAt = src.UpdatedAt
 }
--- a/backend/internal/repository/user_repo_integration_test.go
+++ b/backend/internal/repository/user_repo_integration_test.go
@@ -7,7 +7,6 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/lib/pq"
@@ -35,11 +34,12 @@ func TestUserRepoSuite(t *testing.T) {
 // --- Create / GetByID / GetByEmail / Update / Delete ---

 func (s *UserRepoSuite) TestCreate() {
-	user := &model.User{
-		Email:    "create@test.com",
-		Username: "testuser",
-		Role:     model.RoleUser,
-		Status:   model.StatusActive,
+	user := &service.User{
+		Email:        "create@test.com",
+		Username:     "testuser",
+		PasswordHash: "test-password-hash",
+		Role:         service.RoleUser,
+		Status:       service.StatusActive,
 	}

 	err := s.repo.Create(s.ctx, user)
@@ -57,7 +57,7 @@ func (s *UserRepoSuite) TestGetByID_NotFound() {
 }

 func (s *UserRepoSuite) TestGetByEmail() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "byemail@test.com"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "byemail@test.com"})

 	got, err := s.repo.GetByEmail(s.ctx, user.Email)
 	s.Require().NoError(err, "GetByEmail")
@@ -70,7 +70,7 @@ func (s *UserRepoSuite) TestGetByEmail_NotFound() {
 }

 func (s *UserRepoSuite) TestUpdate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "update@test.com", Username: "original"})
+	user := userModelToService(mustCreateUser(s.T(), s.db, &userModel{Email: "update@test.com", Username: "original"}))

 	user.Username = "updated"
 	err := s.repo.Update(s.ctx, user)
@@ -82,7 +82,7 @@ func (s *UserRepoSuite) TestUpdate() {
 }

 func (s *UserRepoSuite) TestDelete() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "delete@test.com"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "delete@test.com"})

 	err := s.repo.Delete(s.ctx, user.ID)
 	s.Require().NoError(err, "Delete")
@@ -94,8 +94,8 @@ func (s *UserRepoSuite) TestDelete() {
 // --- List / ListWithFilters ---

 func (s *UserRepoSuite) TestList() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "list1@test.com"})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "list2@test.com"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "list1@test.com"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "list2@test.com"})

 	users, page, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10})
 	s.Require().NoError(err, "List")
@@ -104,28 +104,28 @@ func (s *UserRepoSuite) TestList() {
 }

 func (s *UserRepoSuite) TestListWithFilters_Status() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "active@test.com", Status: model.StatusActive})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "disabled@test.com", Status: model.StatusDisabled})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "active@test.com", Status: service.StatusActive})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "disabled@test.com", Status: service.StatusDisabled})

-	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.StatusActive, "", "")
+	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.StatusActive, "", "")
 	s.Require().NoError(err)
 	s.Require().Len(users, 1)
-	s.Require().Equal(model.StatusActive, users[0].Status)
+	s.Require().Equal(service.StatusActive, users[0].Status)
 }

 func (s *UserRepoSuite) TestListWithFilters_Role() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "user@test.com", Role: model.RoleUser})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "admin@test.com", Role: model.RoleAdmin})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "user@test.com", Role: service.RoleUser})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "admin@test.com", Role: service.RoleAdmin})

-	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", model.RoleAdmin, "")
+	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", service.RoleAdmin, "")
 	s.Require().NoError(err)
 	s.Require().Len(users, 1)
-	s.Require().Equal(model.RoleAdmin, users[0].Role)
+	s.Require().Equal(service.RoleAdmin, users[0].Role)
 }

 func (s *UserRepoSuite) TestListWithFilters_Search() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "alice@test.com", Username: "Alice"})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "bob@test.com", Username: "Bob"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "alice@test.com", Username: "Alice"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "bob@test.com", Username: "Bob"})

 	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", "alice")
 	s.Require().NoError(err)
@@ -134,8 +134,8 @@ func (s *UserRepoSuite) TestListWithFilters_Search() {
 }

 func (s *UserRepoSuite) TestListWithFilters_SearchByUsername() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "u1@test.com", Username: "JohnDoe"})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "u2@test.com", Username: "JaneSmith"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "u1@test.com", Username: "JohnDoe"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "u2@test.com", Username: "JaneSmith"})

 	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", "john")
 	s.Require().NoError(err)
@@ -144,8 +144,8 @@ func (s *UserRepoSuite) TestListWithFilters_SearchByUsername() {
 }

 func (s *UserRepoSuite) TestListWithFilters_SearchByWechat() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "w1@test.com", Wechat: "wx_hello"})
-	mustCreateUser(s.T(), s.db, &model.User{Email: "w2@test.com", Wechat: "wx_world"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "w1@test.com", Wechat: "wx_hello"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "w2@test.com", Wechat: "wx_world"})

 	users, _, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, "", "", "wx_hello")
 	s.Require().NoError(err)
@@ -154,19 +154,19 @@ func (s *UserRepoSuite) TestListWithFilters_SearchByWechat() {
 }

 func (s *UserRepoSuite) TestListWithFilters_LoadsActiveSubscriptions() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "sub@test.com", Status: model.StatusActive})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-sub"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "sub@test.com", Status: service.StatusActive})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-sub"})

-	_ = mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	_ = mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(1 * time.Hour),
 	})
-	_ = mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	_ = mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-1 * time.Hour),
 	})

@@ -179,29 +179,29 @@ func (s *UserRepoSuite) TestListWithFilters_LoadsActiveSubscriptions() {
 }

 func (s *UserRepoSuite) TestListWithFilters_CombinedFilters() {
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:    "a@example.com",
 		Username: "Alice",
 		Wechat:   "wx_a",
-		Role:     model.RoleUser,
-		Status:   model.StatusActive,
+		Role:     service.RoleUser,
+		Status:   service.StatusActive,
 		Balance:  10,
 	})
-	target := mustCreateUser(s.T(), s.db, &model.User{
+	target := mustCreateUser(s.T(), s.db, &userModel{
 		Email:    "b@example.com",
 		Username: "Bob",
 		Wechat:   "wx_b",
-		Role:     model.RoleAdmin,
-		Status:   model.StatusActive,
+		Role:     service.RoleAdmin,
+		Status:   service.StatusActive,
 		Balance:  1,
 	})
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "c@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusDisabled,
+		Role:   service.RoleAdmin,
+		Status: service.StatusDisabled,
 	})

-	users, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, model.StatusActive, model.RoleAdmin, "b@")
+	users, page, err := s.repo.ListWithFilters(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, service.StatusActive, service.RoleAdmin, "b@")
 	s.Require().NoError(err, "ListWithFilters")
 	s.Require().Equal(int64(1), page.Total, "ListWithFilters total mismatch")
 	s.Require().Len(users, 1, "ListWithFilters len mismatch")
@@ -211,7 +211,7 @@ func (s *UserRepoSuite) TestListWithFilters_CombinedFilters() {
 // --- Balance operations ---

 func (s *UserRepoSuite) TestUpdateBalance() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "bal@test.com", Balance: 10})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "bal@test.com", Balance: 10})

 	err := s.repo.UpdateBalance(s.ctx, user.ID, 2.5)
 	s.Require().NoError(err, "UpdateBalance")
@@ -222,7 +222,7 @@ func (s *UserRepoSuite) TestUpdateBalance() {
 }

 func (s *UserRepoSuite) TestUpdateBalance_Negative() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "balneg@test.com", Balance: 10})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "balneg@test.com", Balance: 10})

 	err := s.repo.UpdateBalance(s.ctx, user.ID, -3)
 	s.Require().NoError(err, "UpdateBalance with negative")
@@ -233,7 +233,7 @@ func (s *UserRepoSuite) TestUpdateBalance_Negative() {
 }

 func (s *UserRepoSuite) TestDeductBalance() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "deduct@test.com", Balance: 10})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "deduct@test.com", Balance: 10})

 	err := s.repo.DeductBalance(s.ctx, user.ID, 5)
 	s.Require().NoError(err, "DeductBalance")
@@ -244,7 +244,7 @@ func (s *UserRepoSuite) TestDeductBalance() {
 }

 func (s *UserRepoSuite) TestDeductBalance_InsufficientFunds() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "insuf@test.com", Balance: 5})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "insuf@test.com", Balance: 5})

 	err := s.repo.DeductBalance(s.ctx, user.ID, 999)
 	s.Require().Error(err, "expected error for insufficient balance")
@@ -252,7 +252,7 @@ func (s *UserRepoSuite) TestDeductBalance_InsufficientFunds() {
 }

 func (s *UserRepoSuite) TestDeductBalance_ExactAmount() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "exact@test.com", Balance: 10})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "exact@test.com", Balance: 10})

 	err := s.repo.DeductBalance(s.ctx, user.ID, 10)
 	s.Require().NoError(err, "DeductBalance exact amount")
@@ -265,7 +265,7 @@ func (s *UserRepoSuite) TestDeductBalance_ExactAmount() {
 // --- Concurrency ---

 func (s *UserRepoSuite) TestUpdateConcurrency() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "conc@test.com", Concurrency: 5})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "conc@test.com", Concurrency: 5})

 	err := s.repo.UpdateConcurrency(s.ctx, user.ID, 3)
 	s.Require().NoError(err, "UpdateConcurrency")
@@ -276,7 +276,7 @@ func (s *UserRepoSuite) TestUpdateConcurrency() {
 }

 func (s *UserRepoSuite) TestUpdateConcurrency_Negative() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "concneg@test.com", Concurrency: 5})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "concneg@test.com", Concurrency: 5})

 	err := s.repo.UpdateConcurrency(s.ctx, user.ID, -2)
 	s.Require().NoError(err, "UpdateConcurrency negative")
@@ -289,7 +289,7 @@ func (s *UserRepoSuite) TestUpdateConcurrency_Negative() {
 // --- ExistsByEmail ---

 func (s *UserRepoSuite) TestExistsByEmail() {
-	mustCreateUser(s.T(), s.db, &model.User{Email: "exists@test.com"})
+	mustCreateUser(s.T(), s.db, &userModel{Email: "exists@test.com"})

 	exists, err := s.repo.ExistsByEmail(s.ctx, "exists@test.com")
 	s.Require().NoError(err, "ExistsByEmail")
@@ -304,11 +304,11 @@ func (s *UserRepoSuite) TestExistsByEmail() {

 func (s *UserRepoSuite) TestRemoveGroupFromAllowedGroups() {
 	groupID := int64(42)
-	userA := mustCreateUser(s.T(), s.db, &model.User{
+	userA := mustCreateUser(s.T(), s.db, &userModel{
 		Email:         "a1@example.com",
 		AllowedGroups: pq.Int64Array{groupID, 7},
 	})
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:         "a2@example.com",
 		AllowedGroups: pq.Int64Array{7},
 	})
@@ -325,7 +325,7 @@ func (s *UserRepoSuite) TestRemoveGroupFromAllowedGroups() {
 }

 func (s *UserRepoSuite) TestRemoveGroupFromAllowedGroups_NoMatch() {
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:         "nomatch@test.com",
 		AllowedGroups: pq.Int64Array{1, 2, 3},
 	})
@@ -338,15 +338,15 @@ func (s *UserRepoSuite) TestRemoveGroupFromAllowedGroups_NoMatch() {
 // --- GetFirstAdmin ---

 func (s *UserRepoSuite) TestGetFirstAdmin() {
-	admin1 := mustCreateUser(s.T(), s.db, &model.User{
+	admin1 := mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "admin1@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusActive,
+		Role:   service.RoleAdmin,
+		Status: service.StatusActive,
 	})
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "admin2@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusActive,
+		Role:   service.RoleAdmin,
+		Status: service.StatusActive,
 	})

 	got, err := s.repo.GetFirstAdmin(s.ctx)
@@ -355,10 +355,10 @@ func (s *UserRepoSuite) TestGetFirstAdmin() {
 }

 func (s *UserRepoSuite) TestGetFirstAdmin_NoAdmin() {
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "user@example.com",
-		Role:   model.RoleUser,
-		Status: model.StatusActive,
+		Role:   service.RoleUser,
+		Status: service.StatusActive,
 	})

 	_, err := s.repo.GetFirstAdmin(s.ctx)
@@ -366,15 +366,15 @@ func (s *UserRepoSuite) TestGetFirstAdmin_NoAdmin() {
 }

 func (s *UserRepoSuite) TestGetFirstAdmin_DisabledAdminIgnored() {
-	mustCreateUser(s.T(), s.db, &model.User{
+	mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "disabled@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusDisabled,
+		Role:   service.RoleAdmin,
+		Status: service.StatusDisabled,
 	})
-	activeAdmin := mustCreateUser(s.T(), s.db, &model.User{
+	activeAdmin := mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "active@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusActive,
+		Role:   service.RoleAdmin,
+		Status: service.StatusActive,
 	})

 	got, err := s.repo.GetFirstAdmin(s.ctx)
@@ -385,26 +385,26 @@ func (s *UserRepoSuite) TestGetFirstAdmin_DisabledAdminIgnored() {
 // --- Combined original test ---

 func (s *UserRepoSuite) TestCRUD_And_Filters_And_AtomicUpdates() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{
+	user1 := mustCreateUser(s.T(), s.db, &userModel{
 		Email:    "a@example.com",
 		Username: "Alice",
 		Wechat:   "wx_a",
-		Role:     model.RoleUser,
-		Status:   model.StatusActive,
+		Role:     service.RoleUser,
+		Status:   service.StatusActive,
 		Balance:  10,
 	})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{
+	user2 := mustCreateUser(s.T(), s.db, &userModel{
 		Email:    "b@example.com",
 		Username: "Bob",
 		Wechat:   "wx_b",
-		Role:     model.RoleAdmin,
-		Status:   model.StatusActive,
+		Role:     service.RoleAdmin,
+		Status:   service.StatusActive,
 		Balance:  1,
 	})
-	_ = mustCreateUser(s.T(), s.db, &model.User{
+	_ = mustCreateUser(s.T(), s.db, &userModel{
 		Email:  "c@example.com",
-		Role:   model.RoleAdmin,
-		Status: model.StatusDisabled,
+		Role:   service.RoleAdmin,
+		Status: service.StatusDisabled,
 	})

 	got, err := s.repo.GetByID(s.ctx, user1.ID)
@@ -441,7 +441,7 @@ func (s *UserRepoSuite) TestCRUD_And_Filters_And_AtomicUpdates() {
 	s.Require().Equal(user1.Concurrency+3, got5.Concurrency, "UpdateConcurrency mismatch")

 	params := pagination.PaginationParams{Page: 1, PageSize: 10}
-	users, page, err := s.repo.ListWithFilters(s.ctx, params, model.StatusActive, model.RoleAdmin, "b@")
+	users, page, err := s.repo.ListWithFilters(s.ctx, params, service.StatusActive, service.RoleAdmin, "b@")
 	s.Require().NoError(err, "ListWithFilters")
 	s.Require().Equal(int64(1), page.Total, "ListWithFilters total mismatch")
 	s.Require().Len(users, 1, "ListWithFilters len mismatch")
--- a/backend/internal/repository/user_subscription_repo.go
+++ b/backend/internal/repository/user_subscription_repo.go
@@ -4,111 +4,113 @@ import (
 	"context"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"gorm.io/gorm"
 )

-// UserSubscriptionRepository 用户订阅仓库
 type userSubscriptionRepository struct {
 	db *gorm.DB
 }

-// NewUserSubscriptionRepository 创建用户订阅仓库
 func NewUserSubscriptionRepository(db *gorm.DB) service.UserSubscriptionRepository {
 	return &userSubscriptionRepository{db: db}
 }

-// Create 创建订阅
-func (r *userSubscriptionRepository) Create(ctx context.Context, sub *model.UserSubscription) error {
-	err := r.db.WithContext(ctx).Create(sub).Error
+func (r *userSubscriptionRepository) Create(ctx context.Context, sub *service.UserSubscription) error {
+	m := userSubscriptionModelFromService(sub)
+	err := r.db.WithContext(ctx).Create(m).Error
+	if err == nil {
+		applyUserSubscriptionModelToService(sub, m)
+	}
 	return translatePersistenceError(err, nil, service.ErrSubscriptionAlreadyExists)
 }

-// GetByID 根据ID获取订阅
-func (r *userSubscriptionRepository) GetByID(ctx context.Context, id int64) (*model.UserSubscription, error) {
-	var sub model.UserSubscription
+func (r *userSubscriptionRepository) GetByID(ctx context.Context, id int64) (*service.UserSubscription, error) {
+	var m userSubscriptionModel
 	err := r.db.WithContext(ctx).
 		Preload("User").
 		Preload("Group").
 		Preload("AssignedByUser").
-		First(&sub, id).Error
+		First(&m, id).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrSubscriptionNotFound, nil)
 	}
-	return &sub, nil
+	return userSubscriptionModelToService(&m), nil
 }

-// GetByUserIDAndGroupID 根据用户ID和分组ID获取订阅
-func (r *userSubscriptionRepository) GetByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*model.UserSubscription, error) {
-	var sub model.UserSubscription
+func (r *userSubscriptionRepository) GetByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*service.UserSubscription, error) {
+	var m userSubscriptionModel
 	err := r.db.WithContext(ctx).
 		Preload("Group").
 		Where("user_id = ? AND group_id = ?", userID, groupID).
-		First(&sub).Error
+		First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrSubscriptionNotFound, nil)
 	}
-	return &sub, nil
+	return userSubscriptionModelToService(&m), nil
 }

-// GetActiveByUserIDAndGroupID 获取用户对特定分组的有效订阅
-func (r *userSubscriptionRepository) GetActiveByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*model.UserSubscription, error) {
-	var sub model.UserSubscription
+func (r *userSubscriptionRepository) GetActiveByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*service.UserSubscription, error) {
+	var m userSubscriptionModel
 	err := r.db.WithContext(ctx).
 		Preload("Group").
 		Where("user_id = ? AND group_id = ? AND status = ? AND expires_at > ?",
-			userID, groupID, model.SubscriptionStatusActive, time.Now()).
-		First(&sub).Error
+			userID, groupID, service.SubscriptionStatusActive, time.Now()).
+		First(&m).Error
 	if err != nil {
 		return nil, translatePersistenceError(err, service.ErrSubscriptionNotFound, nil)
 	}
-	return &sub, nil
+	return userSubscriptionModelToService(&m), nil
 }

-// Update 更新订阅
-func (r *userSubscriptionRepository) Update(ctx context.Context, sub *model.UserSubscription) error {
+func (r *userSubscriptionRepository) Update(ctx context.Context, sub *service.UserSubscription) error {
 	sub.UpdatedAt = time.Now()
-	return r.db.WithContext(ctx).Save(sub).Error
+	m := userSubscriptionModelFromService(sub)
+	err := r.db.WithContext(ctx).Save(m).Error
+	if err == nil {
+		applyUserSubscriptionModelToService(sub, m)
+	}
+	return err
 }

-// Delete 删除订阅
 func (r *userSubscriptionRepository) Delete(ctx context.Context, id int64) error {
-	return r.db.WithContext(ctx).Delete(&model.UserSubscription{}, id).Error
+	return r.db.WithContext(ctx).Delete(&userSubscriptionModel{}, id).Error
 }

-// ListByUserID 获取用户的所有订阅
-func (r *userSubscriptionRepository) ListByUserID(ctx context.Context, userID int64) ([]model.UserSubscription, error) {
-	var subs []model.UserSubscription
+func (r *userSubscriptionRepository) ListByUserID(ctx context.Context, userID int64) ([]service.UserSubscription, error) {
+	var subs []userSubscriptionModel
 	err := r.db.WithContext(ctx).
 		Preload("Group").
 		Where("user_id = ?", userID).
 		Order("created_at DESC").
 		Find(&subs).Error
-	return subs, err
+	if err != nil {
+		return nil, err
+	}
+	return userSubscriptionModelsToService(subs), nil
 }

-// ListActiveByUserID 获取用户的所有有效订阅
-func (r *userSubscriptionRepository) ListActiveByUserID(ctx context.Context, userID int64) ([]model.UserSubscription, error) {
-	var subs []model.UserSubscription
+func (r *userSubscriptionRepository) ListActiveByUserID(ctx context.Context, userID int64) ([]service.UserSubscription, error) {
+	var subs []userSubscriptionModel
 	err := r.db.WithContext(ctx).
 		Preload("Group").
 		Where("user_id = ? AND status = ? AND expires_at > ?",
-			userID, model.SubscriptionStatusActive, time.Now()).
+			userID, service.SubscriptionStatusActive, time.Now()).
 		Order("created_at DESC").
 		Find(&subs).Error
-	return subs, err
+	if err != nil {
+		return nil, err
+	}
+	return userSubscriptionModelsToService(subs), nil
 }

-// ListByGroupID 获取分组的所有订阅（分页）
-func (r *userSubscriptionRepository) ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]model.UserSubscription, *pagination.PaginationResult, error) {
-	var subs []model.UserSubscription
+func (r *userSubscriptionRepository) ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]service.UserSubscription, *pagination.PaginationResult, error) {
+	var subs []userSubscriptionModel
 	var total int64

-	query := r.db.WithContext(ctx).Model(&model.UserSubscription{}).Where("group_id = ?", groupID)
-
+	query := r.db.WithContext(ctx).Model(&userSubscriptionModel{}).Where("group_id = ?", groupID)
 	if err := query.Count(&total).Error; err != nil {
 		return nil, nil, err
 	}
@@ -124,26 +126,14 @@ func (r *userSubscriptionRepository) ListByGroupID(ctx context.Context, groupID
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return subs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return userSubscriptionModelsToService(subs), paginationResultFromTotal(total, params), nil
 }

-// List 获取所有订阅（分页，支持筛选）
-func (r *userSubscriptionRepository) List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status string) ([]model.UserSubscription, *pagination.PaginationResult, error) {
-	var subs []model.UserSubscription
+func (r *userSubscriptionRepository) List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status string) ([]service.UserSubscription, *pagination.PaginationResult, error) {
+	var subs []userSubscriptionModel
 	var total int64

-	query := r.db.WithContext(ctx).Model(&model.UserSubscription{})
-
+	query := r.db.WithContext(ctx).Model(&userSubscriptionModel{})
 	if userID != nil {
 		query = query.Where("user_id = ?", *userID)
 	}
@@ -170,22 +160,87 @@ func (r *userSubscriptionRepository) List(ctx context.Context, params pagination
 		return nil, nil, err
 	}

-	pages := int(total) / params.Limit()
-	if int(total)%params.Limit() > 0 {
-		pages++
-	}
-
-	return subs, &pagination.PaginationResult{
-		Total:    total,
-		Page:     params.Page,
-		PageSize: params.Limit(),
-		Pages:    pages,
-	}, nil
+	return userSubscriptionModelsToService(subs), paginationResultFromTotal(total, params), nil
+}
+
+func (r *userSubscriptionRepository) ExistsByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (bool, error) {
+	var count int64
+	err := r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("user_id = ? AND group_id = ?", userID, groupID).
+		Count(&count).Error
+	return count > 0, err
+}
+
+func (r *userSubscriptionRepository) ExtendExpiry(ctx context.Context, subscriptionID int64, newExpiresAt time.Time) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", subscriptionID).
+		Updates(map[string]any{
+			"expires_at": newExpiresAt,
+			"updated_at": time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) UpdateStatus(ctx context.Context, subscriptionID int64, status string) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", subscriptionID).
+		Updates(map[string]any{
+			"status":     status,
+			"updated_at": time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) UpdateNotes(ctx context.Context, subscriptionID int64, notes string) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", subscriptionID).
+		Updates(map[string]any{
+			"notes":      notes,
+			"updated_at": time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) ActivateWindows(ctx context.Context, id int64, start time.Time) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", id).
+		Updates(map[string]any{
+			"daily_window_start":   start,
+			"weekly_window_start":  start,
+			"monthly_window_start": start,
+			"updated_at":           time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) ResetDailyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", id).
+		Updates(map[string]any{
+			"daily_usage_usd":    0,
+			"daily_window_start": newWindowStart,
+			"updated_at":         time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) ResetWeeklyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", id).
+		Updates(map[string]any{
+			"weekly_usage_usd":    0,
+			"weekly_window_start": newWindowStart,
+			"updated_at":          time.Now(),
+		}).Error
+}
+
+func (r *userSubscriptionRepository) ResetMonthlyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("id = ?", id).
+		Updates(map[string]any{
+			"monthly_usage_usd":    0,
+			"monthly_window_start": newWindowStart,
+			"updated_at":           time.Now(),
+		}).Error
 }

-// IncrementUsage 增加使用量
 func (r *userSubscriptionRepository) IncrementUsage(ctx context.Context, id int64, costUSD float64) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
+	return r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
 		Where("id = ?", id).
 		Updates(map[string]any{
 			"daily_usage_usd":   gorm.Expr("daily_usage_usd + ?", costUSD),
@@ -195,131 +250,150 @@ func (r *userSubscriptionRepository) IncrementUsage(ctx context.Context, id int6
 		}).Error
 }

-// ResetDailyUsage 重置日使用量
-func (r *userSubscriptionRepository) ResetDailyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"daily_usage_usd":    0,
-			"daily_window_start": newWindowStart,
-			"updated_at":         time.Now(),
-		}).Error
-}
-
-// ResetWeeklyUsage 重置周使用量
-func (r *userSubscriptionRepository) ResetWeeklyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"weekly_usage_usd":    0,
-			"weekly_window_start": newWindowStart,
-			"updated_at":          time.Now(),
-		}).Error
-}
-
-// ResetMonthlyUsage 重置月使用量
-func (r *userSubscriptionRepository) ResetMonthlyUsage(ctx context.Context, id int64, newWindowStart time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"monthly_usage_usd":    0,
-			"monthly_window_start": newWindowStart,
-			"updated_at":           time.Now(),
-		}).Error
-}
-
-// ActivateWindows 激活所有窗口（首次使用时）
-func (r *userSubscriptionRepository) ActivateWindows(ctx context.Context, id int64, activateTime time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"daily_window_start":   activateTime,
-			"weekly_window_start":  activateTime,
-			"monthly_window_start": activateTime,
-			"updated_at":           time.Now(),
-		}).Error
-}
-
-// UpdateStatus 更新订阅状态
-func (r *userSubscriptionRepository) UpdateStatus(ctx context.Context, id int64, status string) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"status":     status,
-			"updated_at": time.Now(),
-		}).Error
-}
-
-// ExtendExpiry 延长订阅过期时间
-func (r *userSubscriptionRepository) ExtendExpiry(ctx context.Context, id int64, newExpiresAt time.Time) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"expires_at": newExpiresAt,
-			"updated_at": time.Now(),
-		}).Error
-}
-
-// UpdateNotes 更新订阅备注
-func (r *userSubscriptionRepository) UpdateNotes(ctx context.Context, id int64, notes string) error {
-	return r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("id = ?", id).
-		Updates(map[string]any{
-			"notes":      notes,
-			"updated_at": time.Now(),
-		}).Error
-}
-
-// ListExpired 获取所有已过期但状态仍为active的订阅
-func (r *userSubscriptionRepository) ListExpired(ctx context.Context) ([]model.UserSubscription, error) {
-	var subs []model.UserSubscription
-	err := r.db.WithContext(ctx).
-		Where("status = ? AND expires_at <= ?", model.SubscriptionStatusActive, time.Now()).
-		Find(&subs).Error
-	return subs, err
-}
-
-// BatchUpdateExpiredStatus 批量更新过期订阅状态
 func (r *userSubscriptionRepository) BatchUpdateExpiredStatus(ctx context.Context) (int64, error) {
-	result := r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("status = ? AND expires_at <= ?", model.SubscriptionStatusActive, time.Now()).
+	result := r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
+		Where("status = ? AND expires_at <= ?", service.SubscriptionStatusActive, time.Now()).
 		Updates(map[string]any{
-			"status":     model.SubscriptionStatusExpired,
+			"status":     service.SubscriptionStatusExpired,
 			"updated_at": time.Now(),
 		})
 	return result.RowsAffected, result.Error
 }

-// ExistsByUserIDAndGroupID 检查用户是否已有该分组的订阅
-func (r *userSubscriptionRepository) ExistsByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (bool, error) {
-	var count int64
-	err := r.db.WithContext(ctx).Model(&model.UserSubscription{}).
-		Where("user_id = ? AND group_id = ?", userID, groupID).
-		Count(&count).Error
-	return count > 0, err
+// Extra repository helpers (currently used only by integration tests).
+
+func (r *userSubscriptionRepository) ListExpired(ctx context.Context) ([]service.UserSubscription, error) {
+	var subs []userSubscriptionModel
+	err := r.db.WithContext(ctx).
+		Where("status = ? AND expires_at <= ?", service.SubscriptionStatusActive, time.Now()).
+		Find(&subs).Error
+	if err != nil {
+		return nil, err
+	}
+	return userSubscriptionModelsToService(subs), nil
 }

-// CountByGroupID 获取分组的订阅数量
 func (r *userSubscriptionRepository) CountByGroupID(ctx context.Context, groupID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.UserSubscription{}).
+	err := r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
 		Where("group_id = ?", groupID).
 		Count(&count).Error
 	return count, err
 }

-// CountActiveByGroupID 获取分组的有效订阅数量
 func (r *userSubscriptionRepository) CountActiveByGroupID(ctx context.Context, groupID int64) (int64, error) {
 	var count int64
-	err := r.db.WithContext(ctx).Model(&model.UserSubscription{}).
+	err := r.db.WithContext(ctx).Model(&userSubscriptionModel{}).
 		Where("group_id = ? AND status = ? AND expires_at > ?",
-			groupID, model.SubscriptionStatusActive, time.Now()).
+			groupID, service.SubscriptionStatusActive, time.Now()).
 		Count(&count).Error
 	return count, err
 }

-// DeleteByGroupID 删除分组相关的所有订阅记录
 func (r *userSubscriptionRepository) DeleteByGroupID(ctx context.Context, groupID int64) (int64, error) {
-	result := r.db.WithContext(ctx).Where("group_id = ?", groupID).Delete(&model.UserSubscription{})
+	result := r.db.WithContext(ctx).Where("group_id = ?", groupID).Delete(&userSubscriptionModel{})
 	return result.RowsAffected, result.Error
 }
+
+type userSubscriptionModel struct {
+	ID      int64 `gorm:"primaryKey"`
+	UserID  int64 `gorm:"index;not null"`
+	GroupID int64 `gorm:"index;not null"`
+
+	StartsAt  time.Time `gorm:"not null"`
+	ExpiresAt time.Time `gorm:"not null"`
+	Status    string    `gorm:"size:20;default:active;not null"`
+
+	DailyWindowStart   *time.Time
+	WeeklyWindowStart  *time.Time
+	MonthlyWindowStart *time.Time
+
+	DailyUsageUSD   float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	WeeklyUsageUSD  float64 `gorm:"type:decimal(20,10);default:0;not null"`
+	MonthlyUsageUSD float64 `gorm:"type:decimal(20,10);default:0;not null"`
+
+	AssignedBy *int64    `gorm:"index"`
+	AssignedAt time.Time `gorm:"not null"`
+	Notes      string    `gorm:"type:text"`
+
+	CreatedAt time.Time `gorm:"not null"`
+	UpdatedAt time.Time `gorm:"not null"`
+
+	User           *userModel  `gorm:"foreignKey:UserID"`
+	Group          *groupModel `gorm:"foreignKey:GroupID"`
+	AssignedByUser *userModel  `gorm:"foreignKey:AssignedBy"`
+}
+
+func (userSubscriptionModel) TableName() string { return "user_subscriptions" }
+
+func userSubscriptionModelToService(m *userSubscriptionModel) *service.UserSubscription {
+	if m == nil {
+		return nil
+	}
+	return &service.UserSubscription{
+		ID:                 m.ID,
+		UserID:             m.UserID,
+		GroupID:            m.GroupID,
+		StartsAt:           m.StartsAt,
+		ExpiresAt:          m.ExpiresAt,
+		Status:             m.Status,
+		DailyWindowStart:   m.DailyWindowStart,
+		WeeklyWindowStart:  m.WeeklyWindowStart,
+		MonthlyWindowStart: m.MonthlyWindowStart,
+		DailyUsageUSD:      m.DailyUsageUSD,
+		WeeklyUsageUSD:     m.WeeklyUsageUSD,
+		MonthlyUsageUSD:    m.MonthlyUsageUSD,
+		AssignedBy:         m.AssignedBy,
+		AssignedAt:         m.AssignedAt,
+		Notes:              m.Notes,
+		CreatedAt:          m.CreatedAt,
+		UpdatedAt:          m.UpdatedAt,
+		User:               userModelToService(m.User),
+		Group:              groupModelToService(m.Group),
+		AssignedByUser:     userModelToService(m.AssignedByUser),
+	}
+}
+
+func userSubscriptionModelsToService(models []userSubscriptionModel) []service.UserSubscription {
+	out := make([]service.UserSubscription, 0, len(models))
+	for i := range models {
+		if s := userSubscriptionModelToService(&models[i]); s != nil {
+			out = append(out, *s)
+		}
+	}
+	return out
+}
+
+func userSubscriptionModelFromService(s *service.UserSubscription) *userSubscriptionModel {
+	if s == nil {
+		return nil
+	}
+	return &userSubscriptionModel{
+		ID:                 s.ID,
+		UserID:             s.UserID,
+		GroupID:            s.GroupID,
+		StartsAt:           s.StartsAt,
+		ExpiresAt:          s.ExpiresAt,
+		Status:             s.Status,
+		DailyWindowStart:   s.DailyWindowStart,
+		WeeklyWindowStart:  s.WeeklyWindowStart,
+		MonthlyWindowStart: s.MonthlyWindowStart,
+		DailyUsageUSD:      s.DailyUsageUSD,
+		WeeklyUsageUSD:     s.WeeklyUsageUSD,
+		MonthlyUsageUSD:    s.MonthlyUsageUSD,
+		AssignedBy:         s.AssignedBy,
+		AssignedAt:         s.AssignedAt,
+		Notes:              s.Notes,
+		CreatedAt:          s.CreatedAt,
+		UpdatedAt:          s.UpdatedAt,
+	}
+}
+
+func applyUserSubscriptionModelToService(sub *service.UserSubscription, m *userSubscriptionModel) {
+	if sub == nil || m == nil {
+		return
+	}
+	sub.ID = m.ID
+	sub.CreatedAt = m.CreatedAt
+	sub.UpdatedAt = m.UpdatedAt
+}
--- a/backend/internal/repository/user_subscription_repo_integration_test.go
+++ b/backend/internal/repository/user_subscription_repo_integration_test.go
@@ -7,8 +7,8 @@ import (
 	"testing"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 	"github.com/stretchr/testify/suite"
 	"gorm.io/gorm"
 )
@@ -33,13 +33,13 @@ func TestUserSubscriptionRepoSuite(t *testing.T) {
 // --- Create / GetByID / Update / Delete ---

 func (s *UserSubscriptionRepoSuite) TestCreate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "sub-create@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-create"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "sub-create@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-create"})

-	sub := &model.UserSubscription{
+	sub := &service.UserSubscription{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	}

@@ -54,14 +54,14 @@ func (s *UserSubscriptionRepoSuite) TestCreate() {
 }

 func (s *UserSubscriptionRepoSuite) TestGetByID_WithPreloads() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "preload@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-preload"})
-	admin := mustCreateUser(s.T(), s.db, &model.User{Email: "admin@test.com", Role: model.RoleAdmin})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "preload@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-preload"})
+	admin := mustCreateUser(s.T(), s.db, &userModel{Email: "admin@test.com", Role: service.RoleAdmin})

-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:     user.ID,
 		GroupID:    group.ID,
-		Status:     model.SubscriptionStatusActive,
+		Status:     service.SubscriptionStatusActive,
 		ExpiresAt:  time.Now().Add(24 * time.Hour),
 		AssignedBy: &admin.ID,
 	})
@@ -82,14 +82,14 @@ func (s *UserSubscriptionRepoSuite) TestGetByID_NotFound() {
 }

 func (s *UserSubscriptionRepoSuite) TestUpdate() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "update@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-update"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "update@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-update"})
+	sub := userSubscriptionModelToService(mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
-	})
+	}))

 	sub.Notes = "updated notes"
 	err := s.repo.Update(s.ctx, sub)
@@ -101,12 +101,12 @@ func (s *UserSubscriptionRepoSuite) TestUpdate() {
 }

 func (s *UserSubscriptionRepoSuite) TestDelete() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "delete@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-delete"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "delete@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-delete"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -120,12 +120,12 @@ func (s *UserSubscriptionRepoSuite) TestDelete() {
 // --- GetByUserIDAndGroupID / GetActiveByUserIDAndGroupID ---

 func (s *UserSubscriptionRepoSuite) TestGetByUserIDAndGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "byuser@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-byuser"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "byuser@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-byuser"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -141,14 +141,14 @@ func (s *UserSubscriptionRepoSuite) TestGetByUserIDAndGroupID_NotFound() {
 }

 func (s *UserSubscriptionRepoSuite) TestGetActiveByUserIDAndGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "active@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-active"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "active@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-active"})

 	// Create active subscription (future expiry)
-	active := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	active := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(2 * time.Hour),
 	})

@@ -158,14 +158,14 @@ func (s *UserSubscriptionRepoSuite) TestGetActiveByUserIDAndGroupID() {
 }

 func (s *UserSubscriptionRepoSuite) TestGetActiveByUserIDAndGroupID_ExpiredIgnored() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "expired@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-expired"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "expired@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-expired"})

 	// Create expired subscription (past expiry but active status)
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(-2 * time.Hour),
 	})

@@ -176,20 +176,20 @@ func (s *UserSubscriptionRepoSuite) TestGetActiveByUserIDAndGroupID_ExpiredIgnor
 // --- ListByUserID / ListActiveByUserID ---

 func (s *UserSubscriptionRepoSuite) TestListByUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listby@test.com"})
-	g1 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-list1"})
-	g2 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-list2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listby@test.com"})
+	g1 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-list1"})
+	g2 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-list2"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g1.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g2.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

@@ -202,46 +202,46 @@ func (s *UserSubscriptionRepoSuite) TestListByUserID() {
 }

 func (s *UserSubscriptionRepoSuite) TestListActiveByUserID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listactive@test.com"})
-	g1 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-act1"})
-	g2 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-act2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listactive@test.com"})
+	g1 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-act1"})
+	g2 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-act2"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g1.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g2.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

 	subs, err := s.repo.ListActiveByUserID(s.ctx, user.ID)
 	s.Require().NoError(err, "ListActiveByUserID")
 	s.Require().Len(subs, 1)
-	s.Require().Equal(model.SubscriptionStatusActive, subs[0].Status)
+	s.Require().Equal(service.SubscriptionStatusActive, subs[0].Status)
 }

 // --- ListByGroupID ---

 func (s *UserSubscriptionRepoSuite) TestListByGroupID() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "u1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "u2@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-listgrp"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "u1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "u2@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-listgrp"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user1.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user2.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -258,13 +258,13 @@ func (s *UserSubscriptionRepoSuite) TestListByGroupID() {
 // --- List with filters ---

 func (s *UserSubscriptionRepoSuite) TestList_NoFilters() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "list@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-list"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "list@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-list"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -275,20 +275,20 @@ func (s *UserSubscriptionRepoSuite) TestList_NoFilters() {
 }

 func (s *UserSubscriptionRepoSuite) TestList_FilterByUserID() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "filter1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "filter2@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-filter"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "filter1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "filter2@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-filter"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user1.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user2.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -299,20 +299,20 @@ func (s *UserSubscriptionRepoSuite) TestList_FilterByUserID() {
 }

 func (s *UserSubscriptionRepoSuite) TestList_FilterByGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "grpfilter@test.com"})
-	g1 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-f1"})
-	g2 := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-f2"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "grpfilter@test.com"})
+	g1 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-f1"})
+	g2 := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-f2"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g1.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   g2.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -323,37 +323,37 @@ func (s *UserSubscriptionRepoSuite) TestList_FilterByGroupID() {
 }

 func (s *UserSubscriptionRepoSuite) TestList_FilterByStatus() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "statfilter@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-stat"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "statfilter@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-stat"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

-	subs, _, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, nil, nil, model.SubscriptionStatusExpired)
+	subs, _, err := s.repo.List(s.ctx, pagination.PaginationParams{Page: 1, PageSize: 10}, nil, nil, service.SubscriptionStatusExpired)
 	s.Require().NoError(err)
 	s.Require().Len(subs, 1)
-	s.Require().Equal(model.SubscriptionStatusExpired, subs[0].Status)
+	s.Require().Equal(service.SubscriptionStatusExpired, subs[0].Status)
 }

 // --- Usage tracking ---

 func (s *UserSubscriptionRepoSuite) TestIncrementUsage() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "usage@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-usage"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "usage@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-usage"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -368,12 +368,12 @@ func (s *UserSubscriptionRepoSuite) TestIncrementUsage() {
 }

 func (s *UserSubscriptionRepoSuite) TestIncrementUsage_Accumulates() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "accum@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-accum"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "accum@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-accum"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -386,12 +386,12 @@ func (s *UserSubscriptionRepoSuite) TestIncrementUsage_Accumulates() {
 }

 func (s *UserSubscriptionRepoSuite) TestActivateWindows() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "activate@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-activate"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "activate@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-activate"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -408,12 +408,12 @@ func (s *UserSubscriptionRepoSuite) TestActivateWindows() {
 }

 func (s *UserSubscriptionRepoSuite) TestResetDailyUsage() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "resetd@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-resetd"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "resetd@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-resetd"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:         user.ID,
 		GroupID:        group.ID,
-		Status:         model.SubscriptionStatusActive,
+		Status:         service.SubscriptionStatusActive,
 		ExpiresAt:      time.Now().Add(24 * time.Hour),
 		DailyUsageUSD:  10.0,
 		WeeklyUsageUSD: 20.0,
@@ -431,12 +431,12 @@ func (s *UserSubscriptionRepoSuite) TestResetDailyUsage() {
 }

 func (s *UserSubscriptionRepoSuite) TestResetWeeklyUsage() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "resetw@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-resetw"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "resetw@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-resetw"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:          user.ID,
 		GroupID:         group.ID,
-		Status:          model.SubscriptionStatusActive,
+		Status:          service.SubscriptionStatusActive,
 		ExpiresAt:       time.Now().Add(24 * time.Hour),
 		WeeklyUsageUSD:  15.0,
 		MonthlyUsageUSD: 30.0,
@@ -454,12 +454,12 @@ func (s *UserSubscriptionRepoSuite) TestResetWeeklyUsage() {
 }

 func (s *UserSubscriptionRepoSuite) TestResetMonthlyUsage() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "resetm@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-resetm"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "resetm@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-resetm"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:          user.ID,
 		GroupID:         group.ID,
-		Status:          model.SubscriptionStatusActive,
+		Status:          service.SubscriptionStatusActive,
 		ExpiresAt:       time.Now().Add(24 * time.Hour),
 		MonthlyUsageUSD: 100.0,
 	})
@@ -477,30 +477,30 @@ func (s *UserSubscriptionRepoSuite) TestResetMonthlyUsage() {
 // --- UpdateStatus / ExtendExpiry / UpdateNotes ---

 func (s *UserSubscriptionRepoSuite) TestUpdateStatus() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "status@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-status"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "status@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-status"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

-	err := s.repo.UpdateStatus(s.ctx, sub.ID, model.SubscriptionStatusExpired)
+	err := s.repo.UpdateStatus(s.ctx, sub.ID, service.SubscriptionStatusExpired)
 	s.Require().NoError(err, "UpdateStatus")

 	got, err := s.repo.GetByID(s.ctx, sub.ID)
 	s.Require().NoError(err)
-	s.Require().Equal(model.SubscriptionStatusExpired, got.Status)
+	s.Require().Equal(service.SubscriptionStatusExpired, got.Status)
 }

 func (s *UserSubscriptionRepoSuite) TestExtendExpiry() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "extend@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-extend"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "extend@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-extend"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -514,12 +514,12 @@ func (s *UserSubscriptionRepoSuite) TestExtendExpiry() {
 }

 func (s *UserSubscriptionRepoSuite) TestUpdateNotes() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "notes@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-notes"})
-	sub := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "notes@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-notes"})
+	sub := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -534,19 +534,19 @@ func (s *UserSubscriptionRepoSuite) TestUpdateNotes() {
 // --- ListExpired / BatchUpdateExpiredStatus ---

 func (s *UserSubscriptionRepoSuite) TestListExpired() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "listexp@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-listexp"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "listexp@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-listexp"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

@@ -556,19 +556,19 @@ func (s *UserSubscriptionRepoSuite) TestListExpired() {
 }

 func (s *UserSubscriptionRepoSuite) TestBatchUpdateExpiredStatus() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "batch@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-batch"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "batch@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-batch"})

-	active := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	active := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	expiredActive := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	expiredActive := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

@@ -577,22 +577,22 @@ func (s *UserSubscriptionRepoSuite) TestBatchUpdateExpiredStatus() {
 	s.Require().Equal(int64(1), affected)

 	gotActive, _ := s.repo.GetByID(s.ctx, active.ID)
-	s.Require().Equal(model.SubscriptionStatusActive, gotActive.Status)
+	s.Require().Equal(service.SubscriptionStatusActive, gotActive.Status)

 	gotExpired, _ := s.repo.GetByID(s.ctx, expiredActive.ID)
-	s.Require().Equal(model.SubscriptionStatusExpired, gotExpired.Status)
+	s.Require().Equal(service.SubscriptionStatusExpired, gotExpired.Status)
 }

 // --- ExistsByUserIDAndGroupID ---

 func (s *UserSubscriptionRepoSuite) TestExistsByUserIDAndGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "exists@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-exists"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "exists@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-exists"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})

@@ -608,20 +608,20 @@ func (s *UserSubscriptionRepoSuite) TestExistsByUserIDAndGroupID() {
 // --- CountByGroupID / CountActiveByGroupID ---

 func (s *UserSubscriptionRepoSuite) TestCountByGroupID() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "cnt1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "cnt2@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-count"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "cnt1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "cnt2@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-count"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user1.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user2.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

@@ -631,20 +631,20 @@ func (s *UserSubscriptionRepoSuite) TestCountByGroupID() {
 }

 func (s *UserSubscriptionRepoSuite) TestCountActiveByGroupID() {
-	user1 := mustCreateUser(s.T(), s.db, &model.User{Email: "cntact1@test.com"})
-	user2 := mustCreateUser(s.T(), s.db, &model.User{Email: "cntact2@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-cntact"})
+	user1 := mustCreateUser(s.T(), s.db, &userModel{Email: "cntact1@test.com"})
+	user2 := mustCreateUser(s.T(), s.db, &userModel{Email: "cntact2@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-cntact"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user1.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user2.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(-24 * time.Hour), // expired by time
 	})

@@ -656,19 +656,19 @@ func (s *UserSubscriptionRepoSuite) TestCountActiveByGroupID() {
 // --- DeleteByGroupID ---

 func (s *UserSubscriptionRepoSuite) TestDeleteByGroupID() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "delgrp@test.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-delgrp"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "delgrp@test.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-delgrp"})

-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(24 * time.Hour),
 	})
-	mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusExpired,
+		Status:    service.SubscriptionStatusExpired,
 		ExpiresAt: time.Now().Add(-24 * time.Hour),
 	})

@@ -683,19 +683,19 @@ func (s *UserSubscriptionRepoSuite) TestDeleteByGroupID() {
 // --- Combined original test ---

 func (s *UserSubscriptionRepoSuite) TestActiveExpiredBoundaries_UsageAndReset_BatchUpdateExpiredStatus() {
-	user := mustCreateUser(s.T(), s.db, &model.User{Email: "subr@example.com"})
-	group := mustCreateGroup(s.T(), s.db, &model.Group{Name: "g-subr"})
+	user := mustCreateUser(s.T(), s.db, &userModel{Email: "subr@example.com"})
+	group := mustCreateGroup(s.T(), s.db, &groupModel{Name: "g-subr"})

-	active := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	active := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(2 * time.Hour),
 	})
-	expiredActive := mustCreateSubscription(s.T(), s.db, &model.UserSubscription{
+	expiredActive := mustCreateSubscription(s.T(), s.db, &userSubscriptionModel{
 		UserID:    user.ID,
 		GroupID:   group.ID,
-		Status:    model.SubscriptionStatusActive,
+		Status:    service.SubscriptionStatusActive,
 		ExpiresAt: time.Now().Add(-2 * time.Hour),
 	})

@@ -729,5 +729,5 @@ func (s *UserSubscriptionRepoSuite) TestActiveExpiredBoundaries_UsageAndReset_Ba
 	s.Require().Equal(int64(1), affected, "expected 1 affected row")
 	updated, err := s.repo.GetByID(s.ctx, expiredActive.ID)
 	s.Require().NoError(err, "GetByID expired")
-	s.Require().Equal(model.SubscriptionStatusExpired, updated.Status, "expected status expired")
+	s.Require().Equal(service.SubscriptionStatusExpired, updated.Status, "expected status expired")
 }
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
--- a/backend/internal/server/middleware/admin_auth.go
+++ b/backend/internal/server/middleware/admin_auth.go
@@ -5,7 +5,6 @@ import (
 	"errors"
 	"strings"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -84,7 +83,11 @@ func validateAdminApiKey(
 		return false
 	}

-	c.Set(string(ContextKeyUser), admin)
+	c.Set(string(ContextKeyUser), AuthSubject{
+		UserID:      admin.ID,
+		Concurrency: admin.Concurrency,
+	})
+	c.Set(string(ContextKeyUserRole), admin.Role)
 	c.Set("auth_method", "admin_api_key")
 	return true
 }
@@ -121,12 +124,16 @@ func validateJWTForAdmin(
 	}

 	// 检查管理员权限
-	if user.Role != model.RoleAdmin {
+	if !user.IsAdmin() {
 		AbortWithError(c, 403, "FORBIDDEN", "Admin access required")
 		return false
 	}

-	c.Set(string(ContextKeyUser), user)
+	c.Set(string(ContextKeyUser), AuthSubject{
+		UserID:      user.ID,
+		Concurrency: user.Concurrency,
+	})
+	c.Set(string(ContextKeyUserRole), user.Role)
 	c.Set("auth_method", "jwt")

 	return true
--- a/backend/internal/server/middleware/admin_only.go
+++ b/backend/internal/server/middleware/admin_only.go
@@ -1,7 +1,7 @@
 package middleware

 import (
-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
 )
@@ -10,15 +10,14 @@ import (
 // 必须在JWTAuth中间件之后使用
 func AdminOnly() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		// 从上下文获取用户
-		user, exists := GetUserFromContext(c)
-		if !exists {
+		role, ok := GetUserRoleFromContext(c)
+		if !ok {
 			AbortWithError(c, 401, "UNAUTHORIZED", "User not found in context")
 			return
 		}

 		// 检查是否为管理员
-		if user.Role != model.RoleAdmin {
+		if role != service.RoleAdmin {
 			AbortWithError(c, 403, "FORBIDDEN", "Admin access required")
 			return
 		}
--- a/backend/internal/server/middleware/api_key_auth.go
+++ b/backend/internal/server/middleware/api_key_auth.go
@@ -5,11 +5,9 @@ import (
 	"log"
 	"strings"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
-	"gorm.io/gorm"
 )

 // NewApiKeyAuthMiddleware 创建 API Key 认证中间件
@@ -46,7 +44,7 @@ func apiKeyAuthWithSubscription(apiKeyService *service.ApiKeyService, subscripti
 		// 从数据库验证API key
 		apiKey, err := apiKeyService.GetByKey(c.Request.Context(), apiKeyString)
 		if err != nil {
-			if errors.Is(err, gorm.ErrRecordNotFound) {
+			if errors.Is(err, service.ErrApiKeyNotFound) {
 				AbortWithError(c, 401, "INVALID_API_KEY", "Invalid API key")
 				return
 			}
@@ -121,28 +119,32 @@ func apiKeyAuthWithSubscription(apiKeyService *service.ApiKeyService, subscripti

 		// 将API key和用户信息存入上下文
 		c.Set(string(ContextKeyApiKey), apiKey)
-		c.Set(string(ContextKeyUser), apiKey.User)
+		c.Set(string(ContextKeyUser), AuthSubject{
+			UserID:      apiKey.User.ID,
+			Concurrency: apiKey.User.Concurrency,
+		})
+		c.Set(string(ContextKeyUserRole), apiKey.User.Role)

 		c.Next()
 	}
 }

 // GetApiKeyFromContext 从上下文中获取API key
-func GetApiKeyFromContext(c *gin.Context) (*model.ApiKey, bool) {
+func GetApiKeyFromContext(c *gin.Context) (*service.ApiKey, bool) {
 	value, exists := c.Get(string(ContextKeyApiKey))
 	if !exists {
 		return nil, false
 	}
-	apiKey, ok := value.(*model.ApiKey)
+	apiKey, ok := value.(*service.ApiKey)
 	return apiKey, ok
 }

 // GetSubscriptionFromContext 从上下文中获取订阅信息
-func GetSubscriptionFromContext(c *gin.Context) (*model.UserSubscription, bool) {
+func GetSubscriptionFromContext(c *gin.Context) (*service.UserSubscription, bool) {
 	value, exists := c.Get(string(ContextKeySubscription))
 	if !exists {
 		return nil, false
 	}
-	subscription, ok := value.(*model.UserSubscription)
+	subscription, ok := value.(*service.UserSubscription)
 	return subscription, ok
 }
--- a/backend/internal/server/middleware/auth_subject.go
+++ b/backend/internal/server/middleware/auth_subject.go
@@ -0,0 +1,28 @@
+package middleware
+
+import "github.com/gin-gonic/gin"
+
+// AuthSubject is the minimal authenticated identity stored in gin context.
+// Decision: {UserID int64, Concurrency int}
+type AuthSubject struct {
+	UserID      int64
+	Concurrency int
+}
+
+func GetAuthSubjectFromContext(c *gin.Context) (AuthSubject, bool) {
+	value, exists := c.Get(string(ContextKeyUser))
+	if !exists {
+		return AuthSubject{}, false
+	}
+	subject, ok := value.(AuthSubject)
+	return subject, ok
+}
+
+func GetUserRoleFromContext(c *gin.Context) (string, bool) {
+	value, exists := c.Get(string(ContextKeyUserRole))
+	if !exists {
+		return "", false
+	}
+	role, ok := value.(string)
+	return role, ok
+}
--- a/backend/internal/server/middleware/jwt_auth.go
+++ b/backend/internal/server/middleware/jwt_auth.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"strings"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/gin-gonic/gin"
@@ -62,19 +61,14 @@ func jwtAuth(authService *service.AuthService, userService *service.UserService)
 			return
 		}

-		// 将用户信息存入上下文
-		c.Set(string(ContextKeyUser), user)
+		c.Set(string(ContextKeyUser), AuthSubject{
+			UserID:      user.ID,
+			Concurrency: user.Concurrency,
+		})
+		c.Set(string(ContextKeyUserRole), user.Role)

 		c.Next()
 	}
 }

-// GetUserFromContext 从上下文中获取用户
-func GetUserFromContext(c *gin.Context) (*model.User, bool) {
-	value, exists := c.Get(string(ContextKeyUser))
-	if !exists {
-		return nil, false
-	}
-	user, ok := value.(*model.User)
-	return user, ok
-}
+// Deprecated: prefer GetAuthSubjectFromContext in auth_subject.go.
--- a/backend/internal/server/middleware/middleware.go
+++ b/backend/internal/server/middleware/middleware.go
@@ -8,6 +8,8 @@ type ContextKey string
 const (
 	// ContextKeyUser 用户上下文键
 	ContextKeyUser ContextKey = "user"
+	// ContextKeyUserRole 当前用户角色（string）
+	ContextKeyUserRole ContextKey = "user_role"
 	// ContextKeyApiKey API密钥上下文键
 	ContextKeyApiKey ContextKey = "api_key"
 	// ContextKeySubscription 订阅上下文键
--- a/backend/internal/service/account.go
+++ b/backend/internal/service/account.go
@@ -0,0 +1,324 @@
+package service
+
+import "time"
+
+type Account struct {
+	ID           int64
+	Name         string
+	Platform     string
+	Type         string
+	Credentials  map[string]any
+	Extra        map[string]any
+	ProxyID      *int64
+	Concurrency  int
+	Priority     int
+	Status       string
+	ErrorMessage string
+	LastUsedAt   *time.Time
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
+
+	Schedulable bool
+
+	RateLimitedAt    *time.Time
+	RateLimitResetAt *time.Time
+	OverloadUntil    *time.Time
+
+	SessionWindowStart  *time.Time
+	SessionWindowEnd    *time.Time
+	SessionWindowStatus string
+
+	Proxy         *Proxy
+	AccountGroups []AccountGroup
+	GroupIDs      []int64
+	Groups        []*Group
+}
+
+func (a *Account) IsActive() bool {
+	return a.Status == StatusActive
+}
+
+func (a *Account) IsSchedulable() bool {
+	if !a.IsActive() || !a.Schedulable {
+		return false
+	}
+	now := time.Now()
+	if a.OverloadUntil != nil && now.Before(*a.OverloadUntil) {
+		return false
+	}
+	if a.RateLimitResetAt != nil && now.Before(*a.RateLimitResetAt) {
+		return false
+	}
+	return true
+}
+
+func (a *Account) IsRateLimited() bool {
+	if a.RateLimitResetAt == nil {
+		return false
+	}
+	return time.Now().Before(*a.RateLimitResetAt)
+}
+
+func (a *Account) IsOverloaded() bool {
+	if a.OverloadUntil == nil {
+		return false
+	}
+	return time.Now().Before(*a.OverloadUntil)
+}
+
+func (a *Account) IsOAuth() bool {
+	return a.Type == AccountTypeOAuth || a.Type == AccountTypeSetupToken
+}
+
+func (a *Account) CanGetUsage() bool {
+	return a.Type == AccountTypeOAuth
+}
+
+func (a *Account) GetCredential(key string) string {
+	if a.Credentials == nil {
+		return ""
+	}
+	if v, ok := a.Credentials[key]; ok {
+		if s, ok := v.(string); ok {
+			return s
+		}
+	}
+	return ""
+}
+
+func (a *Account) GetModelMapping() map[string]string {
+	if a.Credentials == nil {
+		return nil
+	}
+	raw, ok := a.Credentials["model_mapping"]
+	if !ok || raw == nil {
+		return nil
+	}
+	if m, ok := raw.(map[string]any); ok {
+		result := make(map[string]string)
+		for k, v := range m {
+			if s, ok := v.(string); ok {
+				result[k] = s
+			}
+		}
+		if len(result) > 0 {
+			return result
+		}
+	}
+	return nil
+}
+
+func (a *Account) IsModelSupported(requestedModel string) bool {
+	mapping := a.GetModelMapping()
+	if len(mapping) == 0 {
+		return true
+	}
+	_, exists := mapping[requestedModel]
+	return exists
+}
+
+func (a *Account) GetMappedModel(requestedModel string) string {
+	mapping := a.GetModelMapping()
+	if len(mapping) == 0 {
+		return requestedModel
+	}
+	if mappedModel, exists := mapping[requestedModel]; exists {
+		return mappedModel
+	}
+	return requestedModel
+}
+
+func (a *Account) GetBaseURL() string {
+	if a.Type != AccountTypeApiKey {
+		return ""
+	}
+	baseURL := a.GetCredential("base_url")
+	if baseURL == "" {
+		return "https://api.anthropic.com"
+	}
+	return baseURL
+}
+
+func (a *Account) GetExtraString(key string) string {
+	if a.Extra == nil {
+		return ""
+	}
+	if v, ok := a.Extra[key]; ok {
+		if s, ok := v.(string); ok {
+			return s
+		}
+	}
+	return ""
+}
+
+func (a *Account) IsCustomErrorCodesEnabled() bool {
+	if a.Type != AccountTypeApiKey || a.Credentials == nil {
+		return false
+	}
+	if v, ok := a.Credentials["custom_error_codes_enabled"]; ok {
+		if enabled, ok := v.(bool); ok {
+			return enabled
+		}
+	}
+	return false
+}
+
+func (a *Account) GetCustomErrorCodes() []int {
+	if a.Credentials == nil {
+		return nil
+	}
+	raw, ok := a.Credentials["custom_error_codes"]
+	if !ok || raw == nil {
+		return nil
+	}
+	if arr, ok := raw.([]any); ok {
+		result := make([]int, 0, len(arr))
+		for _, v := range arr {
+			if f, ok := v.(float64); ok {
+				result = append(result, int(f))
+			}
+		}
+		return result
+	}
+	return nil
+}
+
+func (a *Account) ShouldHandleErrorCode(statusCode int) bool {
+	if !a.IsCustomErrorCodesEnabled() {
+		return true
+	}
+	codes := a.GetCustomErrorCodes()
+	if len(codes) == 0 {
+		return true
+	}
+	for _, code := range codes {
+		if code == statusCode {
+			return true
+		}
+	}
+	return false
+}
+
+func (a *Account) IsInterceptWarmupEnabled() bool {
+	if a.Credentials == nil {
+		return false
+	}
+	if v, ok := a.Credentials["intercept_warmup_requests"]; ok {
+		if enabled, ok := v.(bool); ok {
+			return enabled
+		}
+	}
+	return false
+}
+
+func (a *Account) IsOpenAI() bool {
+	return a.Platform == PlatformOpenAI
+}
+
+func (a *Account) IsAnthropic() bool {
+	return a.Platform == PlatformAnthropic
+}
+
+func (a *Account) IsOpenAIOAuth() bool {
+	return a.IsOpenAI() && a.Type == AccountTypeOAuth
+}
+
+func (a *Account) IsOpenAIApiKey() bool {
+	return a.IsOpenAI() && a.Type == AccountTypeApiKey
+}
+
+func (a *Account) GetOpenAIBaseURL() string {
+	if !a.IsOpenAI() {
+		return ""
+	}
+	if a.Type == AccountTypeApiKey {
+		baseURL := a.GetCredential("base_url")
+		if baseURL != "" {
+			return baseURL
+		}
+	}
+	return "https://api.openai.com"
+}
+
+func (a *Account) GetOpenAIAccessToken() string {
+	if !a.IsOpenAI() {
+		return ""
+	}
+	return a.GetCredential("access_token")
+}
+
+func (a *Account) GetOpenAIRefreshToken() string {
+	if !a.IsOpenAIOAuth() {
+		return ""
+	}
+	return a.GetCredential("refresh_token")
+}
+
+func (a *Account) GetOpenAIIDToken() string {
+	if !a.IsOpenAIOAuth() {
+		return ""
+	}
+	return a.GetCredential("id_token")
+}
+
+func (a *Account) GetOpenAIApiKey() string {
+	if !a.IsOpenAIApiKey() {
+		return ""
+	}
+	return a.GetCredential("api_key")
+}
+
+func (a *Account) GetOpenAIUserAgent() string {
+	if !a.IsOpenAI() {
+		return ""
+	}
+	return a.GetCredential("user_agent")
+}
+
+func (a *Account) GetChatGPTAccountID() string {
+	if !a.IsOpenAIOAuth() {
+		return ""
+	}
+	return a.GetCredential("chatgpt_account_id")
+}
+
+func (a *Account) GetChatGPTUserID() string {
+	if !a.IsOpenAIOAuth() {
+		return ""
+	}
+	return a.GetCredential("chatgpt_user_id")
+}
+
+func (a *Account) GetOpenAIOrganizationID() string {
+	if !a.IsOpenAIOAuth() {
+		return ""
+	}
+	return a.GetCredential("organization_id")
+}
+
+func (a *Account) GetOpenAITokenExpiresAt() *time.Time {
+	if !a.IsOpenAIOAuth() {
+		return nil
+	}
+	expiresAtStr := a.GetCredential("expires_at")
+	if expiresAtStr == "" {
+		return nil
+	}
+	t, err := time.Parse(time.RFC3339, expiresAtStr)
+	if err != nil {
+		if v, ok := a.Credentials["expires_at"].(float64); ok {
+			tt := time.Unix(int64(v), 0)
+			return &tt
+		}
+		return nil
+	}
+	return &t
+}
+
+func (a *Account) IsOpenAITokenExpired() bool {
+	expiresAt := a.GetOpenAITokenExpiresAt()
+	if expiresAt == nil {
+		return false
+	}
+	return time.Now().Add(60 * time.Second).After(*expiresAt)
+}
--- a/backend/internal/service/account_group.go
+++ b/backend/internal/service/account_group.go
@@ -0,0 +1,13 @@
+package service
+
+import "time"
+
+type AccountGroup struct {
+	AccountID int64
+	GroupID   int64
+	Priority  int
+	CreatedAt time.Time
+
+	Account *Account
+	Group   *Group
+}
--- a/backend/internal/service/account_service.go
+++ b/backend/internal/service/account_service.go
@@ -6,7 +6,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

@@ -15,29 +14,29 @@ var (
 )

 type AccountRepository interface {
-	Create(ctx context.Context, account *model.Account) error
-	GetByID(ctx context.Context, id int64) (*model.Account, error)
+	Create(ctx context.Context, account *Account) error
+	GetByID(ctx context.Context, id int64) (*Account, error)
 	// GetByCRSAccountID finds an account previously synced from CRS.
 	// Returns (nil, nil) if not found.
-	GetByCRSAccountID(ctx context.Context, crsAccountID string) (*model.Account, error)
-	Update(ctx context.Context, account *model.Account) error
+	GetByCRSAccountID(ctx context.Context, crsAccountID string) (*Account, error)
+	Update(ctx context.Context, account *Account) error
 	Delete(ctx context.Context, id int64) error

-	List(ctx context.Context, params pagination.PaginationParams) ([]model.Account, *pagination.PaginationResult, error)
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, accountType, status, search string) ([]model.Account, *pagination.PaginationResult, error)
-	ListByGroup(ctx context.Context, groupID int64) ([]model.Account, error)
-	ListActive(ctx context.Context) ([]model.Account, error)
-	ListByPlatform(ctx context.Context, platform string) ([]model.Account, error)
+	List(ctx context.Context, params pagination.PaginationParams) ([]Account, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, accountType, status, search string) ([]Account, *pagination.PaginationResult, error)
+	ListByGroup(ctx context.Context, groupID int64) ([]Account, error)
+	ListActive(ctx context.Context) ([]Account, error)
+	ListByPlatform(ctx context.Context, platform string) ([]Account, error)

 	UpdateLastUsed(ctx context.Context, id int64) error
 	SetError(ctx context.Context, id int64, errorMsg string) error
 	SetSchedulable(ctx context.Context, id int64, schedulable bool) error
 	BindGroups(ctx context.Context, accountID int64, groupIDs []int64) error

-	ListSchedulable(ctx context.Context) ([]model.Account, error)
-	ListSchedulableByGroupID(ctx context.Context, groupID int64) ([]model.Account, error)
-	ListSchedulableByPlatform(ctx context.Context, platform string) ([]model.Account, error)
-	ListSchedulableByGroupIDAndPlatform(ctx context.Context, groupID int64, platform string) ([]model.Account, error)
+	ListSchedulable(ctx context.Context) ([]Account, error)
+	ListSchedulableByGroupID(ctx context.Context, groupID int64) ([]Account, error)
+	ListSchedulableByPlatform(ctx context.Context, platform string) ([]Account, error)
+	ListSchedulableByGroupIDAndPlatform(ctx context.Context, groupID int64, platform string) ([]Account, error)

 	SetRateLimited(ctx context.Context, id int64, resetAt time.Time) error
 	SetOverloaded(ctx context.Context, id int64, until time.Time) error
@@ -99,7 +98,7 @@ func NewAccountService(accountRepo AccountRepository, groupRepo GroupRepository)
 }

 // Create 创建账号
-func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (*model.Account, error) {
+func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (*Account, error) {
 	// 验证分组是否存在（如果指定了分组）
 	if len(req.GroupIDs) > 0 {
 		for _, groupID := range req.GroupIDs {
@@ -111,7 +110,7 @@ func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (
 	}

 	// 创建账号
-	account := &model.Account{
+	account := &Account{
 		Name:        req.Name,
 		Platform:    req.Platform,
 		Type:        req.Type,
@@ -120,7 +119,7 @@ func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (
 		ProxyID:     req.ProxyID,
 		Concurrency: req.Concurrency,
 		Priority:    req.Priority,
-		Status:      model.StatusActive,
+		Status:      StatusActive,
 	}

 	if err := s.accountRepo.Create(ctx, account); err != nil {
@@ -138,7 +137,7 @@ func (s *AccountService) Create(ctx context.Context, req CreateAccountRequest) (
 }

 // GetByID 根据ID获取账号
-func (s *AccountService) GetByID(ctx context.Context, id int64) (*model.Account, error) {
+func (s *AccountService) GetByID(ctx context.Context, id int64) (*Account, error) {
 	account, err := s.accountRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get account: %w", err)
@@ -147,7 +146,7 @@ func (s *AccountService) GetByID(ctx context.Context, id int64) (*model.Account,
 }

 // List 获取账号列表
-func (s *AccountService) List(ctx context.Context, params pagination.PaginationParams) ([]model.Account, *pagination.PaginationResult, error) {
+func (s *AccountService) List(ctx context.Context, params pagination.PaginationParams) ([]Account, *pagination.PaginationResult, error) {
 	accounts, pagination, err := s.accountRepo.List(ctx, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list accounts: %w", err)
@@ -156,7 +155,7 @@ func (s *AccountService) List(ctx context.Context, params pagination.PaginationP
 }

 // ListByPlatform 根据平台获取账号列表
-func (s *AccountService) ListByPlatform(ctx context.Context, platform string) ([]model.Account, error) {
+func (s *AccountService) ListByPlatform(ctx context.Context, platform string) ([]Account, error) {
 	accounts, err := s.accountRepo.ListByPlatform(ctx, platform)
 	if err != nil {
 		return nil, fmt.Errorf("list accounts by platform: %w", err)
@@ -165,7 +164,7 @@ func (s *AccountService) ListByPlatform(ctx context.Context, platform string) ([
 }

 // ListByGroup 根据分组获取账号列表
-func (s *AccountService) ListByGroup(ctx context.Context, groupID int64) ([]model.Account, error) {
+func (s *AccountService) ListByGroup(ctx context.Context, groupID int64) ([]Account, error) {
 	accounts, err := s.accountRepo.ListByGroup(ctx, groupID)
 	if err != nil {
 		return nil, fmt.Errorf("list accounts by group: %w", err)
@@ -174,7 +173,7 @@ func (s *AccountService) ListByGroup(ctx context.Context, groupID int64) ([]mode
 }

 // Update 更新账号
-func (s *AccountService) Update(ctx context.Context, id int64, req UpdateAccountRequest) (*model.Account, error) {
+func (s *AccountService) Update(ctx context.Context, id int64, req UpdateAccountRequest) (*Account, error) {
 	account, err := s.accountRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get account: %w", err)
@@ -290,13 +289,13 @@ func (s *AccountService) TestCredentials(ctx context.Context, id int64) error {

 	// 根据平台执行不同的测试逻辑
 	switch account.Platform {
-	case model.PlatformAnthropic:
+	case PlatformAnthropic:
 		// TODO: 测试Anthropic API凭证
 		return nil
-	case model.PlatformOpenAI:
+	case PlatformOpenAI:
 		// TODO: 测试OpenAI API凭证
 		return nil
-	case model.PlatformGemini:
+	case PlatformGemini:
 		// TODO: 测试Gemini API凭证
 		return nil
 	default:
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -14,7 +14,6 @@ import (
 	"strings"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 	"github.com/gin-gonic/gin"
@@ -127,7 +126,7 @@ func (s *AccountTestService) TestAccountConnection(c *gin.Context, accountID int
 }

 // testClaudeAccountConnection tests an Anthropic Claude account's connection
-func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account *model.Account, modelID string) error {
+func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account *Account, modelID string) error {
 	ctx := c.Request.Context()

 	// Determine the model to use
@@ -254,7 +253,7 @@ func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account
 }

 // testOpenAIAccountConnection tests an OpenAI account's connection
-func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account *model.Account, modelID string) error {
+func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account *Account, modelID string) error {
 	ctx := c.Request.Context()

 	// Default to openai.DefaultTestModel for OpenAI testing
--- a/backend/internal/service/account_usage_service.go
+++ b/backend/internal/service/account_usage_service.go
@@ -7,24 +7,23 @@ import (
 	"sync"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
 )

 type UsageLogRepository interface {
-	Create(ctx context.Context, log *model.UsageLog) error
-	GetByID(ctx context.Context, id int64) (*model.UsageLog, error)
+	Create(ctx context.Context, log *UsageLog) error
+	GetByID(ctx context.Context, id int64) (*UsageLog, error)
 	Delete(ctx context.Context, id int64) error

-	ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error)
-	ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error)
-	ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error)
+	ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error)
+	ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error)
+	ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error)

-	ListByUserAndTimeRange(ctx context.Context, userID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error)
-	ListByApiKeyAndTimeRange(ctx context.Context, apiKeyID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error)
-	ListByAccountAndTimeRange(ctx context.Context, accountID int64, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error)
-	ListByModelAndTimeRange(ctx context.Context, modelName string, startTime, endTime time.Time) ([]model.UsageLog, *pagination.PaginationResult, error)
+	ListByUserAndTimeRange(ctx context.Context, userID int64, startTime, endTime time.Time) ([]UsageLog, *pagination.PaginationResult, error)
+	ListByApiKeyAndTimeRange(ctx context.Context, apiKeyID int64, startTime, endTime time.Time) ([]UsageLog, *pagination.PaginationResult, error)
+	ListByAccountAndTimeRange(ctx context.Context, accountID int64, startTime, endTime time.Time) ([]UsageLog, *pagination.PaginationResult, error)
+	ListByModelAndTimeRange(ctx context.Context, modelName string, startTime, endTime time.Time) ([]UsageLog, *pagination.PaginationResult, error)

 	GetAccountWindowStats(ctx context.Context, accountID int64, startTime time.Time) (*usagestats.AccountStats, error)
 	GetAccountTodayStats(ctx context.Context, accountID int64) (*usagestats.AccountStats, error)
@@ -44,7 +43,7 @@ type UsageLogRepository interface {
 	GetUserModelStats(ctx context.Context, userID int64, startTime, endTime time.Time) ([]usagestats.ModelStat, error)

 	// Admin usage listing/stats
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters usagestats.UsageLogFilters) ([]model.UsageLog, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters usagestats.UsageLogFilters) ([]UsageLog, *pagination.PaginationResult, error)
 	GetGlobalStats(ctx context.Context, startTime, endTime time.Time) (*usagestats.UsageStats, error)

 	// Account stats
@@ -163,7 +162,7 @@ func (s *AccountUsageService) GetUsage(ctx context.Context, accountID int64) (*U
 	}

 	// Setup Token账号：根据session_window推算（没有profile scope，无法调用usage API）
-	if account.Type == model.AccountTypeSetupToken {
+	if account.Type == AccountTypeSetupToken {
 		usage := s.estimateSetupTokenUsage(account)
 		// 添加窗口统计
 		s.addWindowStats(ctx, account, usage)
@@ -175,7 +174,7 @@ func (s *AccountUsageService) GetUsage(ctx context.Context, accountID int64) (*U
 }

 // addWindowStats 为usage数据添加窗口期统计
-func (s *AccountUsageService) addWindowStats(ctx context.Context, account *model.Account, usage *UsageInfo) {
+func (s *AccountUsageService) addWindowStats(ctx context.Context, account *Account, usage *UsageInfo) {
 	if usage.FiveHour == nil {
 		return
 	}
@@ -225,7 +224,7 @@ func (s *AccountUsageService) GetAccountUsageStats(ctx context.Context, accountI
 }

 // fetchOAuthUsage 从Anthropic API获取OAuth账号的使用量
-func (s *AccountUsageService) fetchOAuthUsage(ctx context.Context, account *model.Account) (*UsageInfo, error) {
+func (s *AccountUsageService) fetchOAuthUsage(ctx context.Context, account *Account) (*UsageInfo, error) {
 	accessToken := account.GetCredential("access_token")
 	if accessToken == "" {
 		return nil, fmt.Errorf("no access token available")
@@ -320,7 +319,7 @@ func (s *AccountUsageService) buildUsageInfo(resp *ClaudeUsageResponse, updatedA
 }

 // estimateSetupTokenUsage 根据session_window推算Setup Token账号的使用量
-func (s *AccountUsageService) estimateSetupTokenUsage(account *model.Account) *UsageInfo {
+func (s *AccountUsageService) estimateSetupTokenUsage(account *Account) *UsageInfo {
 	info := &UsageInfo{}

 	// 如果有session_window信息
--- a/backend/internal/service/admin_service.go
+++ b/backend/internal/service/admin_service.go
@@ -7,62 +7,61 @@ import (
 	"log"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

 // AdminService interface defines admin management operations
 type AdminService interface {
 	// User management
-	ListUsers(ctx context.Context, page, pageSize int, status, role, search string) ([]model.User, int64, error)
-	GetUser(ctx context.Context, id int64) (*model.User, error)
-	CreateUser(ctx context.Context, input *CreateUserInput) (*model.User, error)
-	UpdateUser(ctx context.Context, id int64, input *UpdateUserInput) (*model.User, error)
+	ListUsers(ctx context.Context, page, pageSize int, status, role, search string) ([]User, int64, error)
+	GetUser(ctx context.Context, id int64) (*User, error)
+	CreateUser(ctx context.Context, input *CreateUserInput) (*User, error)
+	UpdateUser(ctx context.Context, id int64, input *UpdateUserInput) (*User, error)
 	DeleteUser(ctx context.Context, id int64) error
-	UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*model.User, error)
-	GetUserAPIKeys(ctx context.Context, userID int64, page, pageSize int) ([]model.ApiKey, int64, error)
+	UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*User, error)
+	GetUserAPIKeys(ctx context.Context, userID int64, page, pageSize int) ([]ApiKey, int64, error)
 	GetUserUsageStats(ctx context.Context, userID int64, period string) (any, error)

 	// Group management
-	ListGroups(ctx context.Context, page, pageSize int, platform, status string, isExclusive *bool) ([]model.Group, int64, error)
-	GetAllGroups(ctx context.Context) ([]model.Group, error)
-	GetAllGroupsByPlatform(ctx context.Context, platform string) ([]model.Group, error)
-	GetGroup(ctx context.Context, id int64) (*model.Group, error)
-	CreateGroup(ctx context.Context, input *CreateGroupInput) (*model.Group, error)
-	UpdateGroup(ctx context.Context, id int64, input *UpdateGroupInput) (*model.Group, error)
+	ListGroups(ctx context.Context, page, pageSize int, platform, status string, isExclusive *bool) ([]Group, int64, error)
+	GetAllGroups(ctx context.Context) ([]Group, error)
+	GetAllGroupsByPlatform(ctx context.Context, platform string) ([]Group, error)
+	GetGroup(ctx context.Context, id int64) (*Group, error)
+	CreateGroup(ctx context.Context, input *CreateGroupInput) (*Group, error)
+	UpdateGroup(ctx context.Context, id int64, input *UpdateGroupInput) (*Group, error)
 	DeleteGroup(ctx context.Context, id int64) error
-	GetGroupAPIKeys(ctx context.Context, groupID int64, page, pageSize int) ([]model.ApiKey, int64, error)
+	GetGroupAPIKeys(ctx context.Context, groupID int64, page, pageSize int) ([]ApiKey, int64, error)

 	// Account management
-	ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string) ([]model.Account, int64, error)
-	GetAccount(ctx context.Context, id int64) (*model.Account, error)
-	CreateAccount(ctx context.Context, input *CreateAccountInput) (*model.Account, error)
-	UpdateAccount(ctx context.Context, id int64, input *UpdateAccountInput) (*model.Account, error)
+	ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string) ([]Account, int64, error)
+	GetAccount(ctx context.Context, id int64) (*Account, error)
+	CreateAccount(ctx context.Context, input *CreateAccountInput) (*Account, error)
+	UpdateAccount(ctx context.Context, id int64, input *UpdateAccountInput) (*Account, error)
 	DeleteAccount(ctx context.Context, id int64) error
-	RefreshAccountCredentials(ctx context.Context, id int64) (*model.Account, error)
-	ClearAccountError(ctx context.Context, id int64) (*model.Account, error)
-	SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*model.Account, error)
+	RefreshAccountCredentials(ctx context.Context, id int64) (*Account, error)
+	ClearAccountError(ctx context.Context, id int64) (*Account, error)
+	SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*Account, error)
 	BulkUpdateAccounts(ctx context.Context, input *BulkUpdateAccountsInput) (*BulkUpdateAccountsResult, error)

 	// Proxy management
-	ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]model.Proxy, int64, error)
-	GetAllProxies(ctx context.Context) ([]model.Proxy, error)
-	GetAllProxiesWithAccountCount(ctx context.Context) ([]model.ProxyWithAccountCount, error)
-	GetProxy(ctx context.Context, id int64) (*model.Proxy, error)
-	CreateProxy(ctx context.Context, input *CreateProxyInput) (*model.Proxy, error)
-	UpdateProxy(ctx context.Context, id int64, input *UpdateProxyInput) (*model.Proxy, error)
+	ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]Proxy, int64, error)
+	GetAllProxies(ctx context.Context) ([]Proxy, error)
+	GetAllProxiesWithAccountCount(ctx context.Context) ([]ProxyWithAccountCount, error)
+	GetProxy(ctx context.Context, id int64) (*Proxy, error)
+	CreateProxy(ctx context.Context, input *CreateProxyInput) (*Proxy, error)
+	UpdateProxy(ctx context.Context, id int64, input *UpdateProxyInput) (*Proxy, error)
 	DeleteProxy(ctx context.Context, id int64) error
-	GetProxyAccounts(ctx context.Context, proxyID int64, page, pageSize int) ([]model.Account, int64, error)
+	GetProxyAccounts(ctx context.Context, proxyID int64, page, pageSize int) ([]Account, int64, error)
 	CheckProxyExists(ctx context.Context, host string, port int, username, password string) (bool, error)
 	TestProxy(ctx context.Context, id int64) (*ProxyTestResult, error)

 	// Redeem code management
-	ListRedeemCodes(ctx context.Context, page, pageSize int, codeType, status, search string) ([]model.RedeemCode, int64, error)
-	GetRedeemCode(ctx context.Context, id int64) (*model.RedeemCode, error)
-	GenerateRedeemCodes(ctx context.Context, input *GenerateRedeemCodesInput) ([]model.RedeemCode, error)
+	ListRedeemCodes(ctx context.Context, page, pageSize int, codeType, status, search string) ([]RedeemCode, int64, error)
+	GetRedeemCode(ctx context.Context, id int64) (*RedeemCode, error)
+	GenerateRedeemCodes(ctx context.Context, input *GenerateRedeemCodesInput) ([]RedeemCode, error)
 	DeleteRedeemCode(ctx context.Context, id int64) error
 	BatchDeleteRedeemCodes(ctx context.Context, ids []int64) (int64, error)
-	ExpireRedeemCode(ctx context.Context, id int64) (*model.RedeemCode, error)
+	ExpireRedeemCode(ctx context.Context, id int64) (*RedeemCode, error)
 }

 // Input types for admin operations
@@ -252,7 +251,7 @@ func NewAdminService(
 }

 // User management implementations
-func (s *adminServiceImpl) ListUsers(ctx context.Context, page, pageSize int, status, role, search string) ([]model.User, int64, error) {
+func (s *adminServiceImpl) ListUsers(ctx context.Context, page, pageSize int, status, role, search string) ([]User, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	users, result, err := s.userRepo.ListWithFilters(ctx, params, status, role, search)
 	if err != nil {
@@ -261,20 +260,21 @@ func (s *adminServiceImpl) ListUsers(ctx context.Context, page, pageSize int, st
 	return users, result.Total, nil
 }

-func (s *adminServiceImpl) GetUser(ctx context.Context, id int64) (*model.User, error) {
+func (s *adminServiceImpl) GetUser(ctx context.Context, id int64) (*User, error) {
 	return s.userRepo.GetByID(ctx, id)
 }

-func (s *adminServiceImpl) CreateUser(ctx context.Context, input *CreateUserInput) (*model.User, error) {
-	user := &model.User{
-		Email:       input.Email,
-		Username:    input.Username,
-		Wechat:      input.Wechat,
-		Notes:       input.Notes,
-		Role:        "user", // Always create as regular user, never admin
-		Balance:     input.Balance,
-		Concurrency: input.Concurrency,
-		Status:      model.StatusActive,
+func (s *adminServiceImpl) CreateUser(ctx context.Context, input *CreateUserInput) (*User, error) {
+	user := &User{
+		Email:         input.Email,
+		Username:      input.Username,
+		Wechat:        input.Wechat,
+		Notes:         input.Notes,
+		Role:          RoleUser, // Always create as regular user, never admin
+		Balance:       input.Balance,
+		Concurrency:   input.Concurrency,
+		Status:        StatusActive,
+		AllowedGroups: input.AllowedGroups,
 	}
 	if err := user.SetPassword(input.Password); err != nil {
 		return nil, err
@@ -285,7 +285,7 @@ func (s *adminServiceImpl) CreateUser(ctx context.Context, input *CreateUserInpu
 	return user, nil
 }

-func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *UpdateUserInput) (*model.User, error) {
+func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *UpdateUserInput) (*User, error) {
 	user, err := s.userRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
@@ -335,16 +335,16 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda

 	concurrencyDiff := user.Concurrency - oldConcurrency
 	if concurrencyDiff != 0 {
-		code, err := model.GenerateRedeemCode()
+		code, err := GenerateRedeemCode()
 		if err != nil {
 			log.Printf("failed to generate adjustment redeem code: %v", err)
 			return user, nil
 		}
-		adjustmentRecord := &model.RedeemCode{
+		adjustmentRecord := &RedeemCode{
 			Code:   code,
-			Type:   model.AdjustmentTypeAdminConcurrency,
+			Type:   AdjustmentTypeAdminConcurrency,
 			Value:  float64(concurrencyDiff),
-			Status: model.StatusUsed,
+			Status: StatusUsed,
 			UsedBy: &user.ID,
 		}
 		now := time.Now()
@@ -369,7 +369,7 @@ func (s *adminServiceImpl) DeleteUser(ctx context.Context, id int64) error {
 	return s.userRepo.Delete(ctx, id)
 }

-func (s *adminServiceImpl) UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*model.User, error) {
+func (s *adminServiceImpl) UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*User, error) {
 	user, err := s.userRepo.GetByID(ctx, userID)
 	if err != nil {
 		return nil, err
@@ -406,17 +406,17 @@ func (s *adminServiceImpl) UpdateUserBalance(ctx context.Context, userID int64,

 	balanceDiff := user.Balance - oldBalance
 	if balanceDiff != 0 {
-		code, err := model.GenerateRedeemCode()
+		code, err := GenerateRedeemCode()
 		if err != nil {
 			log.Printf("failed to generate adjustment redeem code: %v", err)
 			return user, nil
 		}

-		adjustmentRecord := &model.RedeemCode{
+		adjustmentRecord := &RedeemCode{
 			Code:   code,
-			Type:   model.AdjustmentTypeAdminBalance,
+			Type:   AdjustmentTypeAdminBalance,
 			Value:  balanceDiff,
-			Status: model.StatusUsed,
+			Status: StatusUsed,
 			UsedBy: &user.ID,
 			Notes:  notes,
 		}
@@ -431,7 +431,7 @@ func (s *adminServiceImpl) UpdateUserBalance(ctx context.Context, userID int64,
 	return user, nil
 }

-func (s *adminServiceImpl) GetUserAPIKeys(ctx context.Context, userID int64, page, pageSize int) ([]model.ApiKey, int64, error) {
+func (s *adminServiceImpl) GetUserAPIKeys(ctx context.Context, userID int64, page, pageSize int) ([]ApiKey, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	keys, result, err := s.apiKeyRepo.ListByUserID(ctx, userID, params)
 	if err != nil {
@@ -452,7 +452,7 @@ func (s *adminServiceImpl) GetUserUsageStats(ctx context.Context, userID int64,
 }

 // Group management implementations
-func (s *adminServiceImpl) ListGroups(ctx context.Context, page, pageSize int, platform, status string, isExclusive *bool) ([]model.Group, int64, error) {
+func (s *adminServiceImpl) ListGroups(ctx context.Context, page, pageSize int, platform, status string, isExclusive *bool) ([]Group, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	groups, result, err := s.groupRepo.ListWithFilters(ctx, params, platform, status, isExclusive)
 	if err != nil {
@@ -461,36 +461,36 @@ func (s *adminServiceImpl) ListGroups(ctx context.Context, page, pageSize int, p
 	return groups, result.Total, nil
 }

-func (s *adminServiceImpl) GetAllGroups(ctx context.Context) ([]model.Group, error) {
+func (s *adminServiceImpl) GetAllGroups(ctx context.Context) ([]Group, error) {
 	return s.groupRepo.ListActive(ctx)
 }

-func (s *adminServiceImpl) GetAllGroupsByPlatform(ctx context.Context, platform string) ([]model.Group, error) {
+func (s *adminServiceImpl) GetAllGroupsByPlatform(ctx context.Context, platform string) ([]Group, error) {
 	return s.groupRepo.ListActiveByPlatform(ctx, platform)
 }

-func (s *adminServiceImpl) GetGroup(ctx context.Context, id int64) (*model.Group, error) {
+func (s *adminServiceImpl) GetGroup(ctx context.Context, id int64) (*Group, error) {
 	return s.groupRepo.GetByID(ctx, id)
 }

-func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupInput) (*model.Group, error) {
+func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupInput) (*Group, error) {
 	platform := input.Platform
 	if platform == "" {
-		platform = model.PlatformAnthropic
+		platform = PlatformAnthropic
 	}

 	subscriptionType := input.SubscriptionType
 	if subscriptionType == "" {
-		subscriptionType = model.SubscriptionTypeStandard
+		subscriptionType = SubscriptionTypeStandard
 	}

-	group := &model.Group{
+	group := &Group{
 		Name:             input.Name,
 		Description:      input.Description,
 		Platform:         platform,
 		RateMultiplier:   input.RateMultiplier,
 		IsExclusive:      input.IsExclusive,
-		Status:           model.StatusActive,
+		Status:           StatusActive,
 		SubscriptionType: subscriptionType,
 		DailyLimitUSD:    input.DailyLimitUSD,
 		WeeklyLimitUSD:   input.WeeklyLimitUSD,
@@ -502,7 +502,7 @@ func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupIn
 	return group, nil
 }

-func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *UpdateGroupInput) (*model.Group, error) {
+func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *UpdateGroupInput) (*Group, error) {
 	group, err := s.groupRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
@@ -571,7 +571,7 @@ func (s *adminServiceImpl) DeleteGroup(ctx context.Context, id int64) error {
 	return nil
 }

-func (s *adminServiceImpl) GetGroupAPIKeys(ctx context.Context, groupID int64, page, pageSize int) ([]model.ApiKey, int64, error) {
+func (s *adminServiceImpl) GetGroupAPIKeys(ctx context.Context, groupID int64, page, pageSize int) ([]ApiKey, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	keys, result, err := s.apiKeyRepo.ListByGroupID(ctx, groupID, params)
 	if err != nil {
@@ -581,7 +581,7 @@ func (s *adminServiceImpl) GetGroupAPIKeys(ctx context.Context, groupID int64, p
 }

 // Account management implementations
-func (s *adminServiceImpl) ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string) ([]model.Account, int64, error) {
+func (s *adminServiceImpl) ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string) ([]Account, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	accounts, result, err := s.accountRepo.ListWithFilters(ctx, params, platform, accountType, status, search)
 	if err != nil {
@@ -590,21 +590,21 @@ func (s *adminServiceImpl) ListAccounts(ctx context.Context, page, pageSize int,
 	return accounts, result.Total, nil
 }

-func (s *adminServiceImpl) GetAccount(ctx context.Context, id int64) (*model.Account, error) {
+func (s *adminServiceImpl) GetAccount(ctx context.Context, id int64) (*Account, error) {
 	return s.accountRepo.GetByID(ctx, id)
 }

-func (s *adminServiceImpl) CreateAccount(ctx context.Context, input *CreateAccountInput) (*model.Account, error) {
-	account := &model.Account{
+func (s *adminServiceImpl) CreateAccount(ctx context.Context, input *CreateAccountInput) (*Account, error) {
+	account := &Account{
 		Name:        input.Name,
 		Platform:    input.Platform,
 		Type:        input.Type,
-		Credentials: model.JSONB(input.Credentials),
-		Extra:       model.JSONB(input.Extra),
+		Credentials: input.Credentials,
+		Extra:       input.Extra,
 		ProxyID:     input.ProxyID,
 		Concurrency: input.Concurrency,
 		Priority:    input.Priority,
-		Status:      model.StatusActive,
+		Status:      StatusActive,
 	}
 	if err := s.accountRepo.Create(ctx, account); err != nil {
 		return nil, err
@@ -618,7 +618,7 @@ func (s *adminServiceImpl) CreateAccount(ctx context.Context, input *CreateAccou
 	return account, nil
 }

-func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *UpdateAccountInput) (*model.Account, error) {
+func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *UpdateAccountInput) (*Account, error) {
 	account, err := s.accountRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
@@ -631,10 +631,10 @@ func (s *adminServiceImpl) UpdateAccount(ctx context.Context, id int64, input *U
 		account.Type = input.Type
 	}
 	if len(input.Credentials) > 0 {
-		account.Credentials = model.JSONB(input.Credentials)
+		account.Credentials = input.Credentials
 	}
 	if len(input.Extra) > 0 {
-		account.Extra = model.JSONB(input.Extra)
+		account.Extra = input.Extra
 	}
 	if input.ProxyID != nil {
 		account.ProxyID = input.ProxyID
@@ -730,7 +730,7 @@ func (s *adminServiceImpl) DeleteAccount(ctx context.Context, id int64) error {
 	return s.accountRepo.Delete(ctx, id)
 }

-func (s *adminServiceImpl) RefreshAccountCredentials(ctx context.Context, id int64) (*model.Account, error) {
+func (s *adminServiceImpl) RefreshAccountCredentials(ctx context.Context, id int64) (*Account, error) {
 	account, err := s.accountRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
@@ -739,12 +739,12 @@ func (s *adminServiceImpl) RefreshAccountCredentials(ctx context.Context, id int
 	return account, nil
 }

-func (s *adminServiceImpl) ClearAccountError(ctx context.Context, id int64) (*model.Account, error) {
+func (s *adminServiceImpl) ClearAccountError(ctx context.Context, id int64) (*Account, error) {
 	account, err := s.accountRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
 	}
-	account.Status = model.StatusActive
+	account.Status = StatusActive
 	account.ErrorMessage = ""
 	if err := s.accountRepo.Update(ctx, account); err != nil {
 		return nil, err
@@ -752,7 +752,7 @@ func (s *adminServiceImpl) ClearAccountError(ctx context.Context, id int64) (*mo
 	return account, nil
 }

-func (s *adminServiceImpl) SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*model.Account, error) {
+func (s *adminServiceImpl) SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*Account, error) {
 	if err := s.accountRepo.SetSchedulable(ctx, id, schedulable); err != nil {
 		return nil, err
 	}
@@ -760,7 +760,7 @@ func (s *adminServiceImpl) SetAccountSchedulable(ctx context.Context, id int64,
 }

 // Proxy management implementations
-func (s *adminServiceImpl) ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]model.Proxy, int64, error) {
+func (s *adminServiceImpl) ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]Proxy, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	proxies, result, err := s.proxyRepo.ListWithFilters(ctx, params, protocol, status, search)
 	if err != nil {
@@ -769,27 +769,27 @@ func (s *adminServiceImpl) ListProxies(ctx context.Context, page, pageSize int,
 	return proxies, result.Total, nil
 }

-func (s *adminServiceImpl) GetAllProxies(ctx context.Context) ([]model.Proxy, error) {
+func (s *adminServiceImpl) GetAllProxies(ctx context.Context) ([]Proxy, error) {
 	return s.proxyRepo.ListActive(ctx)
 }

-func (s *adminServiceImpl) GetAllProxiesWithAccountCount(ctx context.Context) ([]model.ProxyWithAccountCount, error) {
+func (s *adminServiceImpl) GetAllProxiesWithAccountCount(ctx context.Context) ([]ProxyWithAccountCount, error) {
 	return s.proxyRepo.ListActiveWithAccountCount(ctx)
 }

-func (s *adminServiceImpl) GetProxy(ctx context.Context, id int64) (*model.Proxy, error) {
+func (s *adminServiceImpl) GetProxy(ctx context.Context, id int64) (*Proxy, error) {
 	return s.proxyRepo.GetByID(ctx, id)
 }

-func (s *adminServiceImpl) CreateProxy(ctx context.Context, input *CreateProxyInput) (*model.Proxy, error) {
-	proxy := &model.Proxy{
+func (s *adminServiceImpl) CreateProxy(ctx context.Context, input *CreateProxyInput) (*Proxy, error) {
+	proxy := &Proxy{
 		Name:     input.Name,
 		Protocol: input.Protocol,
 		Host:     input.Host,
 		Port:     input.Port,
 		Username: input.Username,
 		Password: input.Password,
-		Status:   model.StatusActive,
+		Status:   StatusActive,
 	}
 	if err := s.proxyRepo.Create(ctx, proxy); err != nil {
 		return nil, err
@@ -797,7 +797,7 @@ func (s *adminServiceImpl) CreateProxy(ctx context.Context, input *CreateProxyIn
 	return proxy, nil
 }

-func (s *adminServiceImpl) UpdateProxy(ctx context.Context, id int64, input *UpdateProxyInput) (*model.Proxy, error) {
+func (s *adminServiceImpl) UpdateProxy(ctx context.Context, id int64, input *UpdateProxyInput) (*Proxy, error) {
 	proxy, err := s.proxyRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
@@ -835,9 +835,9 @@ func (s *adminServiceImpl) DeleteProxy(ctx context.Context, id int64) error {
 	return s.proxyRepo.Delete(ctx, id)
 }

-func (s *adminServiceImpl) GetProxyAccounts(ctx context.Context, proxyID int64, page, pageSize int) ([]model.Account, int64, error) {
+func (s *adminServiceImpl) GetProxyAccounts(ctx context.Context, proxyID int64, page, pageSize int) ([]Account, int64, error) {
 	// Return mock data for now - would need a dedicated repository method
-	return []model.Account{}, 0, nil
+	return []Account{}, 0, nil
 }

 func (s *adminServiceImpl) CheckProxyExists(ctx context.Context, host string, port int, username, password string) (bool, error) {
@@ -845,7 +845,7 @@ func (s *adminServiceImpl) CheckProxyExists(ctx context.Context, host string, po
 }

 // Redeem code management implementations
-func (s *adminServiceImpl) ListRedeemCodes(ctx context.Context, page, pageSize int, codeType, status, search string) ([]model.RedeemCode, int64, error) {
+func (s *adminServiceImpl) ListRedeemCodes(ctx context.Context, page, pageSize int, codeType, status, search string) ([]RedeemCode, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	codes, result, err := s.redeemCodeRepo.ListWithFilters(ctx, params, codeType, status, search)
 	if err != nil {
@@ -854,13 +854,13 @@ func (s *adminServiceImpl) ListRedeemCodes(ctx context.Context, page, pageSize i
 	return codes, result.Total, nil
 }

-func (s *adminServiceImpl) GetRedeemCode(ctx context.Context, id int64) (*model.RedeemCode, error) {
+func (s *adminServiceImpl) GetRedeemCode(ctx context.Context, id int64) (*RedeemCode, error) {
 	return s.redeemCodeRepo.GetByID(ctx, id)
 }

-func (s *adminServiceImpl) GenerateRedeemCodes(ctx context.Context, input *GenerateRedeemCodesInput) ([]model.RedeemCode, error) {
+func (s *adminServiceImpl) GenerateRedeemCodes(ctx context.Context, input *GenerateRedeemCodesInput) ([]RedeemCode, error) {
 	// 如果是订阅类型，验证必须有 GroupID
-	if input.Type == model.RedeemTypeSubscription {
+	if input.Type == RedeemTypeSubscription {
 		if input.GroupID == nil {
 			return nil, errors.New("group_id is required for subscription type")
 		}
@@ -874,20 +874,20 @@ func (s *adminServiceImpl) GenerateRedeemCodes(ctx context.Context, input *Gener
 		}
 	}

-	codes := make([]model.RedeemCode, 0, input.Count)
+	codes := make([]RedeemCode, 0, input.Count)
 	for i := 0; i < input.Count; i++ {
-		codeValue, err := model.GenerateRedeemCode()
+		codeValue, err := GenerateRedeemCode()
 		if err != nil {
 			return nil, err
 		}
-		code := model.RedeemCode{
+		code := RedeemCode{
 			Code:   codeValue,
 			Type:   input.Type,
 			Value:  input.Value,
-			Status: model.StatusUnused,
+			Status: StatusUnused,
 		}
 		// 订阅类型专用字段
-		if input.Type == model.RedeemTypeSubscription {
+		if input.Type == RedeemTypeSubscription {
 			code.GroupID = input.GroupID
 			code.ValidityDays = input.ValidityDays
 			if code.ValidityDays <= 0 {
@@ -916,12 +916,12 @@ func (s *adminServiceImpl) BatchDeleteRedeemCodes(ctx context.Context, ids []int
 	return deleted, nil
 }

-func (s *adminServiceImpl) ExpireRedeemCode(ctx context.Context, id int64) (*model.RedeemCode, error) {
+func (s *adminServiceImpl) ExpireRedeemCode(ctx context.Context, id int64) (*RedeemCode, error) {
 	code, err := s.redeemCodeRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, err
 	}
-	code.Status = model.StatusExpired
+	code.Status = StatusExpired
 	if err := s.redeemCodeRepo.Update(ctx, code); err != nil {
 		return nil, err
 	}
--- a/backend/internal/service/api_key.go
+++ b/backend/internal/service/api_key.go
@@ -0,0 +1,20 @@
+package service
+
+import "time"
+
+type ApiKey struct {
+	ID        int64
+	UserID    int64
+	Key       string
+	Name      string
+	GroupID   *int64
+	Status    string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	User      *User
+	Group     *Group
+}
+
+func (k *ApiKey) IsActive() bool {
+	return k.Status == StatusActive
+}
--- a/backend/internal/service/api_key_service.go
+++ b/backend/internal/service/api_key_service.go
@@ -10,7 +10,6 @@ import (

 	"github.com/Wei-Shaw/sub2api/internal/config"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/redis/go-redis/v9"
@@ -30,17 +29,17 @@ const (
 )

 type ApiKeyRepository interface {
-	Create(ctx context.Context, key *model.ApiKey) error
-	GetByID(ctx context.Context, id int64) (*model.ApiKey, error)
-	GetByKey(ctx context.Context, key string) (*model.ApiKey, error)
-	Update(ctx context.Context, key *model.ApiKey) error
+	Create(ctx context.Context, key *ApiKey) error
+	GetByID(ctx context.Context, id int64) (*ApiKey, error)
+	GetByKey(ctx context.Context, key string) (*ApiKey, error)
+	Update(ctx context.Context, key *ApiKey) error
 	Delete(ctx context.Context, id int64) error

-	ListByUserID(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.ApiKey, *pagination.PaginationResult, error)
+	ListByUserID(ctx context.Context, userID int64, params pagination.PaginationParams) ([]ApiKey, *pagination.PaginationResult, error)
 	CountByUserID(ctx context.Context, userID int64) (int64, error)
 	ExistsByKey(ctx context.Context, key string) (bool, error)
-	ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]model.ApiKey, *pagination.PaginationResult, error)
-	SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]model.ApiKey, error)
+	ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]ApiKey, *pagination.PaginationResult, error)
+	SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]ApiKey, error)
 	ClearGroupIDByGroupID(ctx context.Context, groupID int64) (int64, error)
 	CountByGroupID(ctx context.Context, groupID int64) (int64, error)
 }
@@ -168,7 +167,7 @@ func (s *ApiKeyService) incrementApiKeyErrorCount(ctx context.Context, userID in
 // canUserBindGroup 检查用户是否可以绑定指定分组
 // 对于订阅类型分组：检查用户是否有有效订阅
 // 对于标准类型分组：使用原有的 AllowedGroups 和 IsExclusive 逻辑
-func (s *ApiKeyService) canUserBindGroup(ctx context.Context, user *model.User, group *model.Group) bool {
+func (s *ApiKeyService) canUserBindGroup(ctx context.Context, user *User, group *Group) bool {
 	// 订阅类型分组：需要有效订阅
 	if group.IsSubscriptionType() {
 		_, err := s.userSubRepo.GetActiveByUserIDAndGroupID(ctx, user.ID, group.ID)
@@ -179,7 +178,7 @@ func (s *ApiKeyService) canUserBindGroup(ctx context.Context, user *model.User,
 }

 // Create 创建API Key
-func (s *ApiKeyService) Create(ctx context.Context, userID int64, req CreateApiKeyRequest) (*model.ApiKey, error) {
+func (s *ApiKeyService) Create(ctx context.Context, userID int64, req CreateApiKeyRequest) (*ApiKey, error) {
 	// 验证用户存在
 	user, err := s.userRepo.GetByID(ctx, userID)
 	if err != nil {
@@ -235,12 +234,12 @@ func (s *ApiKeyService) Create(ctx context.Context, userID int64, req CreateApiK
 	}

 	// 创建API Key记录
-	apiKey := &model.ApiKey{
+	apiKey := &ApiKey{
 		UserID:  userID,
 		Key:     key,
 		Name:    req.Name,
 		GroupID: req.GroupID,
-		Status:  model.StatusActive,
+		Status:  StatusActive,
 	}

 	if err := s.apiKeyRepo.Create(ctx, apiKey); err != nil {
@@ -251,7 +250,7 @@ func (s *ApiKeyService) Create(ctx context.Context, userID int64, req CreateApiK
 }

 // List 获取用户的API Key列表
-func (s *ApiKeyService) List(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.ApiKey, *pagination.PaginationResult, error) {
+func (s *ApiKeyService) List(ctx context.Context, userID int64, params pagination.PaginationParams) ([]ApiKey, *pagination.PaginationResult, error) {
 	keys, pagination, err := s.apiKeyRepo.ListByUserID(ctx, userID, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list api keys: %w", err)
@@ -260,7 +259,7 @@ func (s *ApiKeyService) List(ctx context.Context, userID int64, params paginatio
 }

 // GetByID 根据ID获取API Key
-func (s *ApiKeyService) GetByID(ctx context.Context, id int64) (*model.ApiKey, error) {
+func (s *ApiKeyService) GetByID(ctx context.Context, id int64) (*ApiKey, error) {
 	apiKey, err := s.apiKeyRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get api key: %w", err)
@@ -269,7 +268,7 @@ func (s *ApiKeyService) GetByID(ctx context.Context, id int64) (*model.ApiKey, e
 }

 // GetByKey 根据Key字符串获取API Key（用于认证）
-func (s *ApiKeyService) GetByKey(ctx context.Context, key string) (*model.ApiKey, error) {
+func (s *ApiKeyService) GetByKey(ctx context.Context, key string) (*ApiKey, error) {
 	// 尝试从Redis缓存获取
 	cacheKey := fmt.Sprintf("apikey:%s", key)

@@ -289,7 +288,7 @@ func (s *ApiKeyService) GetByKey(ctx context.Context, key string) (*model.ApiKey
 }

 // Update 更新API Key
-func (s *ApiKeyService) Update(ctx context.Context, id int64, userID int64, req UpdateApiKeyRequest) (*model.ApiKey, error) {
+func (s *ApiKeyService) Update(ctx context.Context, id int64, userID int64, req UpdateApiKeyRequest) (*ApiKey, error) {
 	apiKey, err := s.apiKeyRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get api key: %w", err)
@@ -364,7 +363,7 @@ func (s *ApiKeyService) Delete(ctx context.Context, id int64, userID int64) erro
 }

 // ValidateKey 验证API Key是否有效（用于认证中间件）
-func (s *ApiKeyService) ValidateKey(ctx context.Context, key string) (*model.ApiKey, *model.User, error) {
+func (s *ApiKeyService) ValidateKey(ctx context.Context, key string) (*ApiKey, *User, error) {
 	// 获取API Key
 	apiKey, err := s.GetByKey(ctx, key)
 	if err != nil {
@@ -408,7 +407,7 @@ func (s *ApiKeyService) IncrementUsage(ctx context.Context, keyID int64) error {
 // 返回用户可以选择的分组：
 // - 标准类型分组：公开的（非专属）或用户被明确允许的
 // - 订阅类型分组：用户有有效订阅的
-func (s *ApiKeyService) GetAvailableGroups(ctx context.Context, userID int64) ([]model.Group, error) {
+func (s *ApiKeyService) GetAvailableGroups(ctx context.Context, userID int64) ([]Group, error) {
 	// 获取用户信息
 	user, err := s.userRepo.GetByID(ctx, userID)
 	if err != nil {
@@ -434,7 +433,7 @@ func (s *ApiKeyService) GetAvailableGroups(ctx context.Context, userID int64) ([
 	}

 	// 过滤出用户有权限的分组
-	availableGroups := make([]model.Group, 0)
+	availableGroups := make([]Group, 0)
 	for _, group := range allGroups {
 		if s.canUserBindGroupInternal(user, &group, subscribedGroupIDs) {
 			availableGroups = append(availableGroups, group)
@@ -445,7 +444,7 @@ func (s *ApiKeyService) GetAvailableGroups(ctx context.Context, userID int64) ([
 }

 // canUserBindGroupInternal 内部方法，检查用户是否可以绑定分组（使用预加载的订阅数据）
-func (s *ApiKeyService) canUserBindGroupInternal(user *model.User, group *model.Group, subscribedGroupIDs map[int64]bool) bool {
+func (s *ApiKeyService) canUserBindGroupInternal(user *User, group *Group, subscribedGroupIDs map[int64]bool) bool {
 	// 订阅类型分组：需要有效订阅
 	if group.IsSubscriptionType() {
 		return subscribedGroupIDs[group.ID]
@@ -454,7 +453,7 @@ func (s *ApiKeyService) canUserBindGroupInternal(user *model.User, group *model.
 	return user.CanBindGroup(group.ID, group.IsExclusive)
 }

-func (s *ApiKeyService) SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]model.ApiKey, error) {
+func (s *ApiKeyService) SearchApiKeys(ctx context.Context, userID int64, keyword string, limit int) ([]ApiKey, error) {
 	keys, err := s.apiKeyRepo.SearchApiKeys(ctx, userID, keyword, limit)
 	if err != nil {
 		return nil, fmt.Errorf("search api keys: %w", err)
--- a/backend/internal/service/auth_service.go
+++ b/backend/internal/service/auth_service.go
@@ -9,7 +9,6 @@ import (

 	"github.com/Wei-Shaw/sub2api/internal/config"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"

 	"github.com/golang-jwt/jwt/v5"
 	"golang.org/x/crypto/bcrypt"
@@ -64,12 +63,12 @@ func NewAuthService(
 }

 // Register 用户注册，返回token和用户
-func (s *AuthService) Register(ctx context.Context, email, password string) (string, *model.User, error) {
+func (s *AuthService) Register(ctx context.Context, email, password string) (string, *User, error) {
 	return s.RegisterWithVerification(ctx, email, password, "")
 }

 // RegisterWithVerification 用户注册（支持邮件验证），返回token和用户
-func (s *AuthService) RegisterWithVerification(ctx context.Context, email, password, verifyCode string) (string, *model.User, error) {
+func (s *AuthService) RegisterWithVerification(ctx context.Context, email, password, verifyCode string) (string, *User, error) {
 	// 检查是否开放注册
 	if s.settingService != nil && !s.settingService.IsRegistrationEnabled(ctx) {
 		return "", nil, ErrRegDisabled
@@ -113,13 +112,13 @@ func (s *AuthService) RegisterWithVerification(ctx context.Context, email, passw
 	}

 	// 创建用户
-	user := &model.User{
+	user := &User{
 		Email:        email,
 		PasswordHash: hashedPassword,
-		Role:         model.RoleUser,
+		Role:         RoleUser,
 		Balance:      defaultBalance,
 		Concurrency:  defaultConcurrency,
-		Status:       model.StatusActive,
+		Status:       StatusActive,
 	}

 	if err := s.userRepo.Create(ctx, user); err != nil {
@@ -251,7 +250,7 @@ func (s *AuthService) IsEmailVerifyEnabled(ctx context.Context) bool {
 }

 // Login 用户登录，返回JWT token
-func (s *AuthService) Login(ctx context.Context, email, password string) (string, *model.User, error) {
+func (s *AuthService) Login(ctx context.Context, email, password string) (string, *User, error) {
 	// 查找用户
 	user, err := s.userRepo.GetByEmail(ctx, email)
 	if err != nil {
@@ -307,7 +306,7 @@ func (s *AuthService) ValidateToken(tokenString string) (*JWTClaims, error) {
 }

 // GenerateToken 生成JWT token
-func (s *AuthService) GenerateToken(user *model.User) (string, error) {
+func (s *AuthService) GenerateToken(user *User) (string, error) {
 	now := time.Now()
 	expiresAt := now.Add(time.Duration(s.cfg.JWT.ExpireHour) * time.Hour)

--- a/backend/internal/service/billing_cache_service.go
+++ b/backend/internal/service/billing_cache_service.go
@@ -7,7 +7,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 // 错误定义
@@ -224,7 +223,7 @@ func (s *BillingCacheService) InvalidateSubscription(ctx context.Context, userID
 // CheckBillingEligibility 检查用户是否有资格发起请求
 // 余额模式：检查缓存余额 > 0
 // 订阅模式：检查缓存用量未超过限额（Group限额从参数传入）
-func (s *BillingCacheService) CheckBillingEligibility(ctx context.Context, user *model.User, apiKey *model.ApiKey, group *model.Group, subscription *model.UserSubscription) error {
+func (s *BillingCacheService) CheckBillingEligibility(ctx context.Context, user *User, apiKey *ApiKey, group *Group, subscription *UserSubscription) error {
 	// 判断计费模式
 	isSubscriptionMode := group != nil && group.IsSubscriptionType() && subscription != nil

@@ -252,7 +251,7 @@ func (s *BillingCacheService) checkBalanceEligibility(ctx context.Context, userI
 }

 // checkSubscriptionEligibility 检查订阅模式资格
-func (s *BillingCacheService) checkSubscriptionEligibility(ctx context.Context, userID int64, group *model.Group, subscription *model.UserSubscription) error {
+func (s *BillingCacheService) checkSubscriptionEligibility(ctx context.Context, userID int64, group *Group, subscription *UserSubscription) error {
 	// 获取订阅缓存数据
 	subData, err := s.GetSubscriptionStatus(ctx, userID, group.ID)
 	if err != nil {
@@ -262,7 +261,7 @@ func (s *BillingCacheService) checkSubscriptionEligibility(ctx context.Context,
 	}

 	// 检查订阅状态
-	if subData.Status != model.SubscriptionStatusActive {
+	if subData.Status != SubscriptionStatusActive {
 		return ErrSubscriptionInvalid
 	}

@@ -288,7 +287,7 @@ func (s *BillingCacheService) checkSubscriptionEligibility(ctx context.Context,
 }

 // checkSubscriptionLimitsFallback 降级检查订阅限额
-func (s *BillingCacheService) checkSubscriptionLimitsFallback(subscription *model.UserSubscription, group *model.Group) error {
+func (s *BillingCacheService) checkSubscriptionLimitsFallback(subscription *UserSubscription, group *Group) error {
 	if subscription == nil {
 		return ErrSubscriptionInvalid
 	}
--- a/backend/internal/service/crs_sync_service.go
+++ b/backend/internal/service/crs_sync_service.go
@@ -11,8 +11,6 @@ import (
 	"net/url"
 	"strings"
 	"time"
-
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 type CRSSyncService struct {
@@ -180,7 +178,7 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		),
 	}

-	var proxies []model.Proxy
+	var proxies []Proxy
 	if input.SyncProxies {
 		proxies, _ = s.proxyRepo.ListActive(ctx)
 	}
@@ -197,7 +195,7 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		if targetType == "" {
 			targetType = "oauth"
 		}
-		if targetType != model.AccountTypeOAuth && targetType != model.AccountTypeSetupToken {
+		if targetType != AccountTypeOAuth && targetType != AccountTypeSetupToken {
 			item.Action = "skipped"
 			item.Error = "unsupported authType: " + targetType
 			result.Skipped++
@@ -268,12 +266,12 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		if existing == nil {
-			account := &model.Account{
+			account := &Account{
 				Name:        defaultName(src.Name, src.ID),
-				Platform:    model.PlatformAnthropic,
+				Platform:    PlatformAnthropic,
 				Type:        targetType,
-				Credentials: model.JSONB(credentials),
-				Extra:       model.JSONB(extra),
+				Credentials: credentials,
+				Extra:       extra,
 				ProxyID:     proxyID,
 				Concurrency: concurrency,
 				Priority:    priority,
@@ -288,7 +286,7 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 				continue
 			}
 			// 🔄 Refresh OAuth token after creation
-			if targetType == model.AccountTypeOAuth {
+			if targetType == AccountTypeOAuth {
 				if refreshedCreds := s.refreshOAuthToken(ctx, account); refreshedCreds != nil {
 					account.Credentials = refreshedCreds
 					_ = s.accountRepo.Update(ctx, account)
@@ -301,11 +299,11 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		// Update existing
-		existing.Extra = mergeJSONB(existing.Extra, extra)
+		existing.Extra = mergeMap(existing.Extra, extra)
 		existing.Name = defaultName(src.Name, src.ID)
-		existing.Platform = model.PlatformAnthropic
+		existing.Platform = PlatformAnthropic
 		existing.Type = targetType
-		existing.Credentials = mergeJSONB(existing.Credentials, credentials)
+		existing.Credentials = mergeMap(existing.Credentials, credentials)
 		if proxyID != nil {
 			existing.ProxyID = proxyID
 		}
@@ -323,7 +321,7 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		// 🔄 Refresh OAuth token after update
-		if targetType == model.AccountTypeOAuth {
+		if targetType == AccountTypeOAuth {
 			if refreshedCreds := s.refreshOAuthToken(ctx, existing); refreshedCreds != nil {
 				existing.Credentials = refreshedCreds
 				_ = s.accountRepo.Update(ctx, existing)
@@ -385,12 +383,12 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		if existing == nil {
-			account := &model.Account{
+			account := &Account{
 				Name:        defaultName(src.Name, src.ID),
-				Platform:    model.PlatformAnthropic,
-				Type:        model.AccountTypeApiKey,
-				Credentials: model.JSONB(credentials),
-				Extra:       model.JSONB(extra),
+				Platform:    PlatformAnthropic,
+				Type:        AccountTypeApiKey,
+				Credentials: credentials,
+				Extra:       extra,
 				ProxyID:     proxyID,
 				Concurrency: concurrency,
 				Priority:    priority,
@@ -410,11 +408,11 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 			continue
 		}

-		existing.Extra = mergeJSONB(existing.Extra, extra)
+		existing.Extra = mergeMap(existing.Extra, extra)
 		existing.Name = defaultName(src.Name, src.ID)
-		existing.Platform = model.PlatformAnthropic
-		existing.Type = model.AccountTypeApiKey
-		existing.Credentials = mergeJSONB(existing.Credentials, credentials)
+		existing.Platform = PlatformAnthropic
+		existing.Type = AccountTypeApiKey
+		existing.Credentials = mergeMap(existing.Credentials, credentials)
 		if proxyID != nil {
 			existing.ProxyID = proxyID
 		}
@@ -508,12 +506,12 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		if existing == nil {
-			account := &model.Account{
+			account := &Account{
 				Name:        defaultName(src.Name, src.ID),
-				Platform:    model.PlatformOpenAI,
-				Type:        model.AccountTypeOAuth,
-				Credentials: model.JSONB(credentials),
-				Extra:       model.JSONB(extra),
+				Platform:    PlatformOpenAI,
+				Type:        AccountTypeOAuth,
+				Credentials: credentials,
+				Extra:       extra,
 				ProxyID:     proxyID,
 				Concurrency: concurrency,
 				Priority:    priority,
@@ -538,11 +536,11 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 			continue
 		}

-		existing.Extra = mergeJSONB(existing.Extra, extra)
+		existing.Extra = mergeMap(existing.Extra, extra)
 		existing.Name = defaultName(src.Name, src.ID)
-		existing.Platform = model.PlatformOpenAI
-		existing.Type = model.AccountTypeOAuth
-		existing.Credentials = mergeJSONB(existing.Credentials, credentials)
+		existing.Platform = PlatformOpenAI
+		existing.Type = AccountTypeOAuth
+		existing.Credentials = mergeMap(existing.Credentials, credentials)
 		if proxyID != nil {
 			existing.ProxyID = proxyID
 		}
@@ -629,12 +627,12 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 		}

 		if existing == nil {
-			account := &model.Account{
+			account := &Account{
 				Name:        defaultName(src.Name, src.ID),
-				Platform:    model.PlatformOpenAI,
-				Type:        model.AccountTypeApiKey,
-				Credentials: model.JSONB(credentials),
-				Extra:       model.JSONB(extra),
+				Platform:    PlatformOpenAI,
+				Type:        AccountTypeApiKey,
+				Credentials: credentials,
+				Extra:       extra,
 				ProxyID:     proxyID,
 				Concurrency: concurrency,
 				Priority:    priority,
@@ -654,11 +652,11 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 			continue
 		}

-		existing.Extra = mergeJSONB(existing.Extra, extra)
+		existing.Extra = mergeMap(existing.Extra, extra)
 		existing.Name = defaultName(src.Name, src.ID)
-		existing.Platform = model.PlatformOpenAI
-		existing.Type = model.AccountTypeApiKey
-		existing.Credentials = mergeJSONB(existing.Credentials, credentials)
+		existing.Platform = PlatformOpenAI
+		existing.Type = AccountTypeApiKey
+		existing.Credentials = mergeMap(existing.Credentials, credentials)
 		if proxyID != nil {
 			existing.ProxyID = proxyID
 		}
@@ -683,9 +681,8 @@ func (s *CRSSyncService) SyncFromCRS(ctx context.Context, input SyncFromCRSInput
 	return result, nil
 }

-// mergeJSONB merges two JSONB maps without removing keys that are absent in updates.
-func mergeJSONB(existing model.JSONB, updates map[string]any) model.JSONB {
-	out := make(model.JSONB)
+func mergeMap(existing map[string]any, updates map[string]any) map[string]any {
+	out := make(map[string]any, len(existing)+len(updates))
 	for k, v := range existing {
 		out[k] = v
 	}
@@ -695,7 +692,7 @@ func mergeJSONB(existing model.JSONB, updates map[string]any) model.JSONB {
 	return out
 }

-func (s *CRSSyncService) mapOrCreateProxy(ctx context.Context, enabled bool, cached *[]model.Proxy, src *crsProxy, defaultName string) (*int64, error) {
+func (s *CRSSyncService) mapOrCreateProxy(ctx context.Context, enabled bool, cached *[]Proxy, src *crsProxy, defaultName string) (*int64, error) {
 	if !enabled || src == nil {
 		return nil, nil
 	}
@@ -731,14 +728,14 @@ func (s *CRSSyncService) mapOrCreateProxy(ctx context.Context, enabled bool, cac
 	}

 	// Create new proxy
-	proxy := &model.Proxy{
+	proxy := &Proxy{
 		Name:     defaultProxyName(defaultName, protocol, host, port),
 		Protocol: protocol,
 		Host:     host,
 		Port:     port,
 		Username: username,
 		Password: password,
-		Status:   model.StatusActive,
+		Status:   StatusActive,
 	}
 	if err := s.proxyRepo.Create(ctx, proxy); err != nil {
 		return nil, err
@@ -897,8 +894,8 @@ func crsExportAccounts(ctx context.Context, client *http.Client, baseURL, adminT

 // refreshOAuthToken attempts to refresh OAuth token for a synced account
 // Returns updated credentials or nil if refresh failed/not applicable
-func (s *CRSSyncService) refreshOAuthToken(ctx context.Context, account *model.Account) model.JSONB {
-	if account.Type != model.AccountTypeOAuth {
+func (s *CRSSyncService) refreshOAuthToken(ctx context.Context, account *Account) map[string]any {
+	if account.Type != AccountTypeOAuth {
 		return nil
 	}

@@ -906,7 +903,7 @@ func (s *CRSSyncService) refreshOAuthToken(ctx context.Context, account *model.A
 	var err error

 	switch account.Platform {
-	case model.PlatformAnthropic:
+	case PlatformAnthropic:
 		if s.oauthService == nil {
 			return nil
 		}
@@ -931,7 +928,7 @@ func (s *CRSSyncService) refreshOAuthToken(ctx context.Context, account *model.A
 				newCredentials["scope"] = tokenInfo.Scope
 			}
 		}
-	case model.PlatformOpenAI:
+	case PlatformOpenAI:
 		if s.openaiOAuthService == nil {
 			return nil
 		}
@@ -956,5 +953,5 @@ func (s *CRSSyncService) refreshOAuthToken(ctx context.Context, account *model.A
 		return nil
 	}

-	return model.JSONB(newCredentials)
+	return newCredentials
 }
--- a/backend/internal/service/domain_constants.go
+++ b/backend/internal/service/domain_constants.go
@@ -0,0 +1,96 @@
+package service
+
+// Status constants
+const (
+	StatusActive   = "active"
+	StatusDisabled = "disabled"
+	StatusError    = "error"
+	StatusUnused   = "unused"
+	StatusUsed     = "used"
+	StatusExpired  = "expired"
+)
+
+// Role constants
+const (
+	RoleAdmin = "admin"
+	RoleUser  = "user"
+)
+
+// Platform constants
+const (
+	PlatformAnthropic = "anthropic"
+	PlatformOpenAI    = "openai"
+	PlatformGemini    = "gemini"
+)
+
+// Account type constants
+const (
+	AccountTypeOAuth      = "oauth"       // OAuth类型账号（full scope: profile + inference）
+	AccountTypeSetupToken = "setup-token" // Setup Token类型账号（inference only scope）
+	AccountTypeApiKey     = "apikey"      // API Key类型账号
+)
+
+// Redeem type constants
+const (
+	RedeemTypeBalance      = "balance"
+	RedeemTypeConcurrency  = "concurrency"
+	RedeemTypeSubscription = "subscription"
+)
+
+// Admin adjustment type constants
+const (
+	AdjustmentTypeAdminBalance     = "admin_balance"     // 管理员调整余额
+	AdjustmentTypeAdminConcurrency = "admin_concurrency" // 管理员调整并发数
+)
+
+// Group subscription type constants
+const (
+	SubscriptionTypeStandard     = "standard"     // 标准计费模式（按余额扣费）
+	SubscriptionTypeSubscription = "subscription" // 订阅模式（按限额控制）
+)
+
+// Subscription status constants
+const (
+	SubscriptionStatusActive    = "active"
+	SubscriptionStatusExpired   = "expired"
+	SubscriptionStatusSuspended = "suspended"
+)
+
+// Setting keys
+const (
+	// 注册设置
+	SettingKeyRegistrationEnabled = "registration_enabled" // 是否开放注册
+	SettingKeyEmailVerifyEnabled  = "email_verify_enabled" // 是否开启邮件验证
+
+	// 邮件服务设置
+	SettingKeySmtpHost     = "smtp_host"      // SMTP服务器地址
+	SettingKeySmtpPort     = "smtp_port"      // SMTP端口
+	SettingKeySmtpUsername = "smtp_username"  // SMTP用户名
+	SettingKeySmtpPassword = "smtp_password"  // SMTP密码（加密存储）
+	SettingKeySmtpFrom     = "smtp_from"      // 发件人地址
+	SettingKeySmtpFromName = "smtp_from_name" // 发件人名称
+	SettingKeySmtpUseTLS   = "smtp_use_tls"   // 是否使用TLS
+
+	// Cloudflare Turnstile 设置
+	SettingKeyTurnstileEnabled   = "turnstile_enabled"    // 是否启用 Turnstile 验证
+	SettingKeyTurnstileSiteKey   = "turnstile_site_key"   // Turnstile Site Key
+	SettingKeyTurnstileSecretKey = "turnstile_secret_key" // Turnstile Secret Key
+
+	// OEM设置
+	SettingKeySiteName     = "site_name"     // 网站名称
+	SettingKeySiteLogo     = "site_logo"     // 网站Logo (base64)
+	SettingKeySiteSubtitle = "site_subtitle" // 网站副标题
+	SettingKeyApiBaseUrl   = "api_base_url"  // API端点地址（用于客户端配置和导入）
+	SettingKeyContactInfo  = "contact_info"  // 客服联系方式
+	SettingKeyDocUrl       = "doc_url"       // 文档链接
+
+	// 默认配置
+	SettingKeyDefaultConcurrency = "default_concurrency" // 新用户默认并发量
+	SettingKeyDefaultBalance     = "default_balance"     // 新用户默认余额
+
+	// 管理员 API Key
+	SettingKeyAdminApiKey = "admin_api_key" // 全局管理员 API Key（用于外部系统集成）
+)
+
+// Admin API Key prefix (distinct from user "sk-" keys)
+const AdminApiKeyPrefix = "admin-"
--- a/backend/internal/service/email_service.go
+++ b/backend/internal/service/email_service.go
@@ -11,7 +11,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 var (
@@ -69,13 +68,13 @@ func NewEmailService(settingRepo SettingRepository, cache EmailCache) *EmailServ
 // GetSmtpConfig 从数据库获取SMTP配置
 func (s *EmailService) GetSmtpConfig(ctx context.Context) (*SmtpConfig, error) {
 	keys := []string{
-		model.SettingKeySmtpHost,
-		model.SettingKeySmtpPort,
-		model.SettingKeySmtpUsername,
-		model.SettingKeySmtpPassword,
-		model.SettingKeySmtpFrom,
-		model.SettingKeySmtpFromName,
-		model.SettingKeySmtpUseTLS,
+		SettingKeySmtpHost,
+		SettingKeySmtpPort,
+		SettingKeySmtpUsername,
+		SettingKeySmtpPassword,
+		SettingKeySmtpFrom,
+		SettingKeySmtpFromName,
+		SettingKeySmtpUseTLS,
 	}

 	settings, err := s.settingRepo.GetMultiple(ctx, keys)
@@ -83,27 +82,27 @@ func (s *EmailService) GetSmtpConfig(ctx context.Context) (*SmtpConfig, error) {
 		return nil, fmt.Errorf("get smtp settings: %w", err)
 	}

-	host := settings[model.SettingKeySmtpHost]
+	host := settings[SettingKeySmtpHost]
 	if host == "" {
 		return nil, ErrEmailNotConfigured
 	}

 	port := 587 // 默认端口
-	if portStr := settings[model.SettingKeySmtpPort]; portStr != "" {
+	if portStr := settings[SettingKeySmtpPort]; portStr != "" {
 		if p, err := strconv.Atoi(portStr); err == nil {
 			port = p
 		}
 	}

-	useTLS := settings[model.SettingKeySmtpUseTLS] == "true"
+	useTLS := settings[SettingKeySmtpUseTLS] == "true"

 	return &SmtpConfig{
 		Host:     host,
 		Port:     port,
-		Username: settings[model.SettingKeySmtpUsername],
-		Password: settings[model.SettingKeySmtpPassword],
-		From:     settings[model.SettingKeySmtpFrom],
-		FromName: settings[model.SettingKeySmtpFromName],
+		Username: settings[SettingKeySmtpUsername],
+		Password: settings[SettingKeySmtpPassword],
+		From:     settings[SettingKeySmtpFrom],
+		FromName: settings[SettingKeySmtpFromName],
 		UseTLS:   useTLS,
 	}, nil
 }
--- a/backend/internal/service/gateway_service.go
+++ b/backend/internal/service/gateway_service.go
@@ -17,7 +17,6 @@ import (
 	"time"

 	"github.com/Wei-Shaw/sub2api/internal/config"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
@@ -265,12 +264,12 @@ func (s *GatewayService) replaceModelInBody(body []byte, newModel string) []byte
 }

 // SelectAccount 选择账号（粘性会话+优先级）
-func (s *GatewayService) SelectAccount(ctx context.Context, groupID *int64, sessionHash string) (*model.Account, error) {
+func (s *GatewayService) SelectAccount(ctx context.Context, groupID *int64, sessionHash string) (*Account, error) {
 	return s.SelectAccountForModel(ctx, groupID, sessionHash, "")
 }

 // SelectAccountForModel 选择支持指定模型的账号（粘性会话+优先级+模型映射）
-func (s *GatewayService) SelectAccountForModel(ctx context.Context, groupID *int64, sessionHash string, requestedModel string) (*model.Account, error) {
+func (s *GatewayService) SelectAccountForModel(ctx context.Context, groupID *int64, sessionHash string, requestedModel string) (*Account, error) {
 	// 1. 查询粘性会话
 	if sessionHash != "" {
 		accountID, err := s.cache.GetSessionAccountID(ctx, sessionHash)
@@ -289,19 +288,19 @@ func (s *GatewayService) SelectAccountForModel(ctx context.Context, groupID *int
 	}

 	// 2. 获取可调度账号列表（排除限流和过载的账号，仅限 Anthropic 平台）
-	var accounts []model.Account
+	var accounts []Account
 	var err error
 	if groupID != nil {
-		accounts, err = s.accountRepo.ListSchedulableByGroupIDAndPlatform(ctx, *groupID, model.PlatformAnthropic)
+		accounts, err = s.accountRepo.ListSchedulableByGroupIDAndPlatform(ctx, *groupID, PlatformAnthropic)
 	} else {
-		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, model.PlatformAnthropic)
+		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, PlatformAnthropic)
 	}
 	if err != nil {
 		return nil, fmt.Errorf("query accounts failed: %w", err)
 	}

 	// 3. 按优先级+最久未用选择（考虑模型支持）
-	var selected *model.Account
+	var selected *Account
 	for i := range accounts {
 		acc := &accounts[i]
 		// 检查模型支持
@@ -341,12 +340,12 @@ func (s *GatewayService) SelectAccountForModel(ctx context.Context, groupID *int
 }

 // GetAccessToken 获取账号凭证
-func (s *GatewayService) GetAccessToken(ctx context.Context, account *model.Account) (string, string, error) {
+func (s *GatewayService) GetAccessToken(ctx context.Context, account *Account) (string, string, error) {
 	switch account.Type {
-	case model.AccountTypeOAuth, model.AccountTypeSetupToken:
+	case AccountTypeOAuth, AccountTypeSetupToken:
 		// Both oauth and setup-token use OAuth token flow
 		return s.getOAuthToken(ctx, account)
-	case model.AccountTypeApiKey:
+	case AccountTypeApiKey:
 		apiKey := account.GetCredential("api_key")
 		if apiKey == "" {
 			return "", "", errors.New("api_key not found in credentials")
@@ -357,7 +356,7 @@ func (s *GatewayService) GetAccessToken(ctx context.Context, account *model.Acco
 	}
 }

-func (s *GatewayService) getOAuthToken(ctx context.Context, account *model.Account) (string, string, error) {
+func (s *GatewayService) getOAuthToken(ctx context.Context, account *Account) (string, string, error) {
 	accessToken := account.GetCredential("access_token")
 	if accessToken == "" {
 		return "", "", errors.New("access_token not found in credentials")
@@ -372,10 +371,7 @@ const (
 	retryDelay = 3 * time.Second // 重试等待时间
 )

-// shouldRetryUpstreamError 判断是否应该重试上游错误
-// OAuth/Setup Token 账号：仅 403 重试
-// API Key 账号：未配置的错误码重试
-func (s *GatewayService) shouldRetryUpstreamError(account *model.Account, statusCode int) bool {
+func (s *GatewayService) shouldRetryUpstreamError(account *Account, statusCode int) bool {
 	// OAuth/Setup Token 账号：仅 403 重试
 	if account.IsOAuth() {
 		return statusCode == 403
@@ -386,7 +382,7 @@ func (s *GatewayService) shouldRetryUpstreamError(account *model.Account, status
 }

 // Forward 转发请求到Claude API
-func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *model.Account, body []byte) (*ForwardResult, error) {
+func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *Account, body []byte) (*ForwardResult, error) {
 	startTime := time.Now()

 	// 解析请求获取model和stream
@@ -412,7 +408,7 @@ func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *m

 	// 应用模型映射（仅对apikey类型账号）
 	originalModel := req.Model
-	if account.Type == model.AccountTypeApiKey {
+	if account.Type == AccountTypeApiKey {
 		mappedModel := account.GetMappedModel(req.Model)
 		if mappedModel != req.Model {
 			// 替换请求体中的模型名
@@ -504,10 +500,10 @@ func (s *GatewayService) Forward(ctx context.Context, c *gin.Context, account *m
 	}, nil
 }

-func (s *GatewayService) buildUpstreamRequest(ctx context.Context, c *gin.Context, account *model.Account, body []byte, token, tokenType string) (*http.Request, error) {
+func (s *GatewayService) buildUpstreamRequest(ctx context.Context, c *gin.Context, account *Account, body []byte, token, tokenType string) (*http.Request, error) {
 	// 确定目标URL
 	targetURL := claudeAPIURL
-	if account.Type == model.AccountTypeApiKey {
+	if account.Type == AccountTypeApiKey {
 		baseURL := account.GetBaseURL()
 		targetURL = baseURL + "/v1/messages"
 	}
@@ -631,7 +627,7 @@ func (s *GatewayService) getBetaHeader(body []byte, clientBetaHeader string) str
 	return claude.DefaultBetaHeader
 }

-func (s *GatewayService) handleErrorResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account) (*ForwardResult, error) {
+func (s *GatewayService) handleErrorResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account) (*ForwardResult, error) {
 	body, _ := io.ReadAll(resp.Body)

 	// 处理上游错误，标记账号状态
@@ -686,7 +682,7 @@ func (s *GatewayService) handleErrorResponse(ctx context.Context, resp *http.Res
 // handleRetryExhaustedError 处理重试耗尽后的错误
 // OAuth 403：标记账号异常
 // API Key 未配置错误码：仅返回错误，不标记账号
-func (s *GatewayService) handleRetryExhaustedError(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account) (*ForwardResult, error) {
+func (s *GatewayService) handleRetryExhaustedError(ctx context.Context, resp *http.Response, c *gin.Context, account *Account) (*ForwardResult, error) {
 	body, _ := io.ReadAll(resp.Body)
 	statusCode := resp.StatusCode

@@ -717,7 +713,7 @@ type streamingResult struct {
 	firstTokenMs *int
 }

-func (s *GatewayService) handleStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account, startTime time.Time, originalModel, mappedModel string) (*streamingResult, error) {
+func (s *GatewayService) handleStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account, startTime time.Time, originalModel, mappedModel string) (*streamingResult, error) {
 	// 更新5h窗口状态
 	s.rateLimitService.UpdateSessionWindow(ctx, account, resp.Header)

@@ -856,7 +852,7 @@ func (s *GatewayService) parseSSEUsage(data string, usage *ClaudeUsage) {
 	}
 }

-func (s *GatewayService) handleNonStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account, originalModel, mappedModel string) (*ClaudeUsage, error) {
+func (s *GatewayService) handleNonStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account, originalModel, mappedModel string) (*ClaudeUsage, error) {
 	// 更新5h窗口状态
 	s.rateLimitService.UpdateSessionWindow(ctx, account, resp.Header)

@@ -915,10 +911,10 @@ func (s *GatewayService) replaceModelInResponseBody(body []byte, fromModel, toMo
 // RecordUsageInput 记录使用量的输入参数
 type RecordUsageInput struct {
 	Result       *ForwardResult
-	ApiKey       *model.ApiKey
-	User         *model.User
-	Account      *model.Account
-	Subscription *model.UserSubscription // 可选：订阅信息
+	ApiKey       *ApiKey
+	User         *User
+	Account      *Account
+	Subscription *UserSubscription // 可选：订阅信息
 }

 // RecordUsage 记录使用量并扣费（或更新订阅用量）
@@ -952,14 +948,14 @@ func (s *GatewayService) RecordUsage(ctx context.Context, input *RecordUsageInpu

 	// 判断计费方式：订阅模式 vs 余额模式
 	isSubscriptionBilling := subscription != nil && apiKey.Group != nil && apiKey.Group.IsSubscriptionType()
-	billingType := model.BillingTypeBalance
+	billingType := BillingTypeBalance
 	if isSubscriptionBilling {
-		billingType = model.BillingTypeSubscription
+		billingType = BillingTypeSubscription
 	}

 	// 创建使用日志
 	durationMs := int(result.Duration.Milliseconds())
-	usageLog := &model.UsageLog{
+	usageLog := &UsageLog{
 		UserID:              user.ID,
 		ApiKeyID:            apiKey.ID,
 		AccountID:           account.ID,
@@ -1038,9 +1034,9 @@ func (s *GatewayService) RecordUsage(ctx context.Context, input *RecordUsageInpu

 // ForwardCountTokens 转发 count_tokens 请求到上游 API
 // 特点：不记录使用量、仅支持非流式响应
-func (s *GatewayService) ForwardCountTokens(ctx context.Context, c *gin.Context, account *model.Account, body []byte) error {
+func (s *GatewayService) ForwardCountTokens(ctx context.Context, c *gin.Context, account *Account, body []byte) error {
 	// 应用模型映射（仅对 apikey 类型账号）
-	if account.Type == model.AccountTypeApiKey {
+	if account.Type == AccountTypeApiKey {
 		var req struct {
 			Model string `json:"model"`
 		}
@@ -1113,10 +1109,10 @@ func (s *GatewayService) ForwardCountTokens(ctx context.Context, c *gin.Context,
 }

 // buildCountTokensRequest 构建 count_tokens 上游请求
-func (s *GatewayService) buildCountTokensRequest(ctx context.Context, c *gin.Context, account *model.Account, body []byte, token, tokenType string) (*http.Request, error) {
+func (s *GatewayService) buildCountTokensRequest(ctx context.Context, c *gin.Context, account *Account, body []byte, token, tokenType string) (*http.Request, error) {
 	// 确定目标 URL
 	targetURL := claudeAPICountTokensURL
-	if account.Type == model.AccountTypeApiKey {
+	if account.Type == AccountTypeApiKey {
 		baseURL := account.GetBaseURL()
 		targetURL = baseURL + "/v1/messages/count_tokens"
 	}
--- a/backend/internal/service/group.go
+++ b/backend/internal/service/group.go
@@ -0,0 +1,48 @@
+package service
+
+import "time"
+
+type Group struct {
+	ID             int64
+	Name           string
+	Description    string
+	Platform       string
+	RateMultiplier float64
+	IsExclusive    bool
+	Status         string
+
+	SubscriptionType string
+	DailyLimitUSD    *float64
+	WeeklyLimitUSD   *float64
+	MonthlyLimitUSD  *float64
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+
+	AccountGroups []AccountGroup
+	AccountCount  int64
+}
+
+func (g *Group) IsActive() bool {
+	return g.Status == StatusActive
+}
+
+func (g *Group) IsSubscriptionType() bool {
+	return g.SubscriptionType == SubscriptionTypeSubscription
+}
+
+func (g *Group) IsFreeSubscription() bool {
+	return g.IsSubscriptionType() && g.RateMultiplier == 0
+}
+
+func (g *Group) HasDailyLimit() bool {
+	return g.DailyLimitUSD != nil && *g.DailyLimitUSD > 0
+}
+
+func (g *Group) HasWeeklyLimit() bool {
+	return g.WeeklyLimitUSD != nil && *g.WeeklyLimitUSD > 0
+}
+
+func (g *Group) HasMonthlyLimit() bool {
+	return g.MonthlyLimitUSD != nil && *g.MonthlyLimitUSD > 0
+}
--- a/backend/internal/service/group_service.go
+++ b/backend/internal/service/group_service.go
@@ -5,7 +5,6 @@ import (
 	"fmt"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

@@ -15,16 +14,16 @@ var (
 )

 type GroupRepository interface {
-	Create(ctx context.Context, group *model.Group) error
-	GetByID(ctx context.Context, id int64) (*model.Group, error)
-	Update(ctx context.Context, group *model.Group) error
+	Create(ctx context.Context, group *Group) error
+	GetByID(ctx context.Context, id int64) (*Group, error)
+	Update(ctx context.Context, group *Group) error
 	Delete(ctx context.Context, id int64) error
 	DeleteCascade(ctx context.Context, id int64) ([]int64, error)

-	List(ctx context.Context, params pagination.PaginationParams) ([]model.Group, *pagination.PaginationResult, error)
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, status string, isExclusive *bool) ([]model.Group, *pagination.PaginationResult, error)
-	ListActive(ctx context.Context) ([]model.Group, error)
-	ListActiveByPlatform(ctx context.Context, platform string) ([]model.Group, error)
+	List(ctx context.Context, params pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, platform, status string, isExclusive *bool) ([]Group, *pagination.PaginationResult, error)
+	ListActive(ctx context.Context) ([]Group, error)
+	ListActiveByPlatform(ctx context.Context, platform string) ([]Group, error)

 	ExistsByName(ctx context.Context, name string) (bool, error)
 	GetAccountCount(ctx context.Context, groupID int64) (int64, error)
@@ -61,7 +60,7 @@ func NewGroupService(groupRepo GroupRepository) *GroupService {
 }

 // Create 创建分组
-func (s *GroupService) Create(ctx context.Context, req CreateGroupRequest) (*model.Group, error) {
+func (s *GroupService) Create(ctx context.Context, req CreateGroupRequest) (*Group, error) {
 	// 检查名称是否已存在
 	exists, err := s.groupRepo.ExistsByName(ctx, req.Name)
 	if err != nil {
@@ -72,12 +71,14 @@ func (s *GroupService) Create(ctx context.Context, req CreateGroupRequest) (*mod
 	}

 	// 创建分组
-	group := &model.Group{
-		Name:           req.Name,
-		Description:    req.Description,
-		RateMultiplier: req.RateMultiplier,
-		IsExclusive:    req.IsExclusive,
-		Status:         model.StatusActive,
+	group := &Group{
+		Name:             req.Name,
+		Description:      req.Description,
+		Platform:         PlatformAnthropic,
+		RateMultiplier:   req.RateMultiplier,
+		IsExclusive:      req.IsExclusive,
+		Status:           StatusActive,
+		SubscriptionType: SubscriptionTypeStandard,
 	}

 	if err := s.groupRepo.Create(ctx, group); err != nil {
@@ -88,7 +89,7 @@ func (s *GroupService) Create(ctx context.Context, req CreateGroupRequest) (*mod
 }

 // GetByID 根据ID获取分组
-func (s *GroupService) GetByID(ctx context.Context, id int64) (*model.Group, error) {
+func (s *GroupService) GetByID(ctx context.Context, id int64) (*Group, error) {
 	group, err := s.groupRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get group: %w", err)
@@ -97,7 +98,7 @@ func (s *GroupService) GetByID(ctx context.Context, id int64) (*model.Group, err
 }

 // List 获取分组列表
-func (s *GroupService) List(ctx context.Context, params pagination.PaginationParams) ([]model.Group, *pagination.PaginationResult, error) {
+func (s *GroupService) List(ctx context.Context, params pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error) {
 	groups, pagination, err := s.groupRepo.List(ctx, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list groups: %w", err)
@@ -106,7 +107,7 @@ func (s *GroupService) List(ctx context.Context, params pagination.PaginationPar
 }

 // ListActive 获取活跃分组列表
-func (s *GroupService) ListActive(ctx context.Context) ([]model.Group, error) {
+func (s *GroupService) ListActive(ctx context.Context) ([]Group, error) {
 	groups, err := s.groupRepo.ListActive(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("list active groups: %w", err)
@@ -115,7 +116,7 @@ func (s *GroupService) ListActive(ctx context.Context) ([]model.Group, error) {
 }

 // Update 更新分组
-func (s *GroupService) Update(ctx context.Context, id int64, req UpdateGroupRequest) (*model.Group, error) {
+func (s *GroupService) Update(ctx context.Context, id int64, req UpdateGroupRequest) (*Group, error) {
 	group, err := s.groupRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get group: %w", err)
--- a/backend/internal/service/oauth_service.go
+++ b/backend/internal/service/oauth_service.go
@@ -6,7 +6,6 @@ import (
 	"log"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/oauth"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 )
@@ -274,7 +273,7 @@ func (s *OAuthService) RefreshToken(ctx context.Context, refreshToken string, pr
 }

 // RefreshAccountToken refreshes token for an account
-func (s *OAuthService) RefreshAccountToken(ctx context.Context, account *model.Account) (*TokenInfo, error) {
+func (s *OAuthService) RefreshAccountToken(ctx context.Context, account *Account) (*TokenInfo, error) {
 	refreshToken := account.GetCredential("refresh_token")
 	if refreshToken == "" {
 		return nil, fmt.Errorf("no refresh token available")
--- a/backend/internal/service/openai_gateway_service.go
+++ b/backend/internal/service/openai_gateway_service.go
@@ -16,7 +16,6 @@ import (
 	"time"

 	"github.com/Wei-Shaw/sub2api/internal/config"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/gin-gonic/gin"
 )

@@ -119,12 +118,12 @@ func (s *OpenAIGatewayService) GenerateSessionHash(c *gin.Context) string {
 }

 // SelectAccount selects an OpenAI account with sticky session support
-func (s *OpenAIGatewayService) SelectAccount(ctx context.Context, groupID *int64, sessionHash string) (*model.Account, error) {
+func (s *OpenAIGatewayService) SelectAccount(ctx context.Context, groupID *int64, sessionHash string) (*Account, error) {
 	return s.SelectAccountForModel(ctx, groupID, sessionHash, "")
 }

 // SelectAccountForModel selects an account supporting the requested model
-func (s *OpenAIGatewayService) SelectAccountForModel(ctx context.Context, groupID *int64, sessionHash string, requestedModel string) (*model.Account, error) {
+func (s *OpenAIGatewayService) SelectAccountForModel(ctx context.Context, groupID *int64, sessionHash string, requestedModel string) (*Account, error) {
 	// 1. Check sticky session
 	if sessionHash != "" {
 		accountID, err := s.cache.GetSessionAccountID(ctx, "openai:"+sessionHash)
@@ -139,19 +138,19 @@ func (s *OpenAIGatewayService) SelectAccountForModel(ctx context.Context, groupI
 	}

 	// 2. Get schedulable OpenAI accounts
-	var accounts []model.Account
+	var accounts []Account
 	var err error
 	if groupID != nil {
-		accounts, err = s.accountRepo.ListSchedulableByGroupIDAndPlatform(ctx, *groupID, model.PlatformOpenAI)
+		accounts, err = s.accountRepo.ListSchedulableByGroupIDAndPlatform(ctx, *groupID, PlatformOpenAI)
 	} else {
-		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, model.PlatformOpenAI)
+		accounts, err = s.accountRepo.ListSchedulableByPlatform(ctx, PlatformOpenAI)
 	}
 	if err != nil {
 		return nil, fmt.Errorf("query accounts failed: %w", err)
 	}

 	// 3. Select by priority + LRU
-	var selected *model.Account
+	var selected *Account
 	for i := range accounts {
 		acc := &accounts[i]
 		// Check model support
@@ -189,15 +188,15 @@ func (s *OpenAIGatewayService) SelectAccountForModel(ctx context.Context, groupI
 }

 // GetAccessToken gets the access token for an OpenAI account
-func (s *OpenAIGatewayService) GetAccessToken(ctx context.Context, account *model.Account) (string, string, error) {
+func (s *OpenAIGatewayService) GetAccessToken(ctx context.Context, account *Account) (string, string, error) {
 	switch account.Type {
-	case model.AccountTypeOAuth:
+	case AccountTypeOAuth:
 		accessToken := account.GetOpenAIAccessToken()
 		if accessToken == "" {
 			return "", "", errors.New("access_token not found in credentials")
 		}
 		return accessToken, "oauth", nil
-	case model.AccountTypeApiKey:
+	case AccountTypeApiKey:
 		apiKey := account.GetOpenAIApiKey()
 		if apiKey == "" {
 			return "", "", errors.New("api_key not found in credentials")
@@ -209,7 +208,7 @@ func (s *OpenAIGatewayService) GetAccessToken(ctx context.Context, account *mode
 }

 // Forward forwards request to OpenAI API
-func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, account *model.Account, body []byte) (*OpenAIForwardResult, error) {
+func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, account *Account, body []byte) (*OpenAIForwardResult, error) {
 	startTime := time.Now()

 	// Parse request body once (avoid multiple parse/serialize cycles)
@@ -234,7 +233,7 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 	}

 	// For OAuth accounts using ChatGPT internal API, add store: false
-	if account.Type == model.AccountTypeOAuth {
+	if account.Type == AccountTypeOAuth {
 		reqBody["store"] = false
 		bodyModified = true
 	}
@@ -296,7 +295,7 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 	}

 	// Extract and save Codex usage snapshot from response headers (for OAuth accounts)
-	if account.Type == model.AccountTypeOAuth {
+	if account.Type == AccountTypeOAuth {
 		if snapshot := extractCodexUsageHeaders(resp.Header); snapshot != nil {
 			s.updateCodexUsageSnapshot(ctx, account.ID, snapshot)
 		}
@@ -312,14 +311,14 @@ func (s *OpenAIGatewayService) Forward(ctx context.Context, c *gin.Context, acco
 	}, nil
 }

-func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.Context, account *model.Account, body []byte, token string, isStream bool) (*http.Request, error) {
+func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.Context, account *Account, body []byte, token string, isStream bool) (*http.Request, error) {
 	// Determine target URL based on account type
 	var targetURL string
 	switch account.Type {
-	case model.AccountTypeOAuth:
+	case AccountTypeOAuth:
 		// OAuth accounts use ChatGPT internal API
 		targetURL = chatgptCodexURL
-	case model.AccountTypeApiKey:
+	case AccountTypeApiKey:
 		// API Key accounts use Platform API or custom base URL
 		baseURL := account.GetOpenAIBaseURL()
 		if baseURL != "" {
@@ -340,7 +339,7 @@ func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.
 	req.Header.Set("authorization", "Bearer "+token)

 	// Set headers specific to OAuth accounts (ChatGPT internal API)
-	if account.Type == model.AccountTypeOAuth {
+	if account.Type == AccountTypeOAuth {
 		// Required: set Host for ChatGPT API (must use req.Host, not Header.Set)
 		req.Host = "chatgpt.com"
 		// Required: set chatgpt-account-id header
@@ -380,7 +379,7 @@ func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.
 	return req, nil
 }

-func (s *OpenAIGatewayService) handleErrorResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account) (*OpenAIForwardResult, error) {
+func (s *OpenAIGatewayService) handleErrorResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account) (*OpenAIForwardResult, error) {
 	body, _ := io.ReadAll(resp.Body)

 	// Check custom error codes
@@ -436,7 +435,7 @@ type openaiStreamingResult struct {
 	firstTokenMs *int
 }

-func (s *OpenAIGatewayService) handleStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account, startTime time.Time, originalModel, mappedModel string) (*openaiStreamingResult, error) {
+func (s *OpenAIGatewayService) handleStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account, startTime time.Time, originalModel, mappedModel string) (*openaiStreamingResult, error) {
 	// Set SSE response headers
 	c.Header("Content-Type", "text/event-stream")
 	c.Header("Cache-Control", "no-cache")
@@ -552,7 +551,7 @@ func (s *OpenAIGatewayService) parseSSEUsage(data string, usage *OpenAIUsage) {
 	}
 }

-func (s *OpenAIGatewayService) handleNonStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *model.Account, originalModel, mappedModel string) (*OpenAIUsage, error) {
+func (s *OpenAIGatewayService) handleNonStreamingResponse(ctx context.Context, resp *http.Response, c *gin.Context, account *Account, originalModel, mappedModel string) (*OpenAIUsage, error) {
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
@@ -618,10 +617,10 @@ func (s *OpenAIGatewayService) replaceModelInResponseBody(body []byte, fromModel
 // OpenAIRecordUsageInput input for recording usage
 type OpenAIRecordUsageInput struct {
 	Result       *OpenAIForwardResult
-	ApiKey       *model.ApiKey
-	User         *model.User
-	Account      *model.Account
-	Subscription *model.UserSubscription
+	ApiKey       *ApiKey
+	User         *User
+	Account      *Account
+	Subscription *UserSubscription
 }

 // RecordUsage records usage and deducts balance
@@ -660,14 +659,14 @@ func (s *OpenAIGatewayService) RecordUsage(ctx context.Context, input *OpenAIRec

 	// Determine billing type
 	isSubscriptionBilling := subscription != nil && apiKey.Group != nil && apiKey.Group.IsSubscriptionType()
-	billingType := model.BillingTypeBalance
+	billingType := BillingTypeBalance
 	if isSubscriptionBilling {
-		billingType = model.BillingTypeSubscription
+		billingType = BillingTypeSubscription
 	}

 	// Create usage log
 	durationMs := int(result.Duration.Milliseconds())
-	usageLog := &model.UsageLog{
+	usageLog := &UsageLog{
 		UserID:              user.ID,
 		ApiKeyID:            apiKey.ID,
 		AccountID:           account.ID,
--- a/backend/internal/service/openai_oauth_service.go
+++ b/backend/internal/service/openai_oauth_service.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 )

@@ -200,7 +199,7 @@ func (s *OpenAIOAuthService) RefreshToken(ctx context.Context, refreshToken stri
 }

 // RefreshAccountToken refreshes token for an OpenAI account
-func (s *OpenAIOAuthService) RefreshAccountToken(ctx context.Context, account *model.Account) (*OpenAITokenInfo, error) {
+func (s *OpenAIOAuthService) RefreshAccountToken(ctx context.Context, account *Account) (*OpenAITokenInfo, error) {
 	if !account.IsOpenAI() {
 		return nil, fmt.Errorf("account is not an OpenAI account")
 	}
--- a/backend/internal/service/proxy.go
+++ b/backend/internal/service/proxy.go
@@ -0,0 +1,35 @@
+package service
+
+import (
+	"fmt"
+	"time"
+)
+
+type Proxy struct {
+	ID        int64
+	Name      string
+	Protocol  string
+	Host      string
+	Port      int
+	Username  string
+	Password  string
+	Status    string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+func (p *Proxy) IsActive() bool {
+	return p.Status == StatusActive
+}
+
+func (p *Proxy) URL() string {
+	if p.Username != "" && p.Password != "" {
+		return fmt.Sprintf("%s://%s:%s@%s:%d", p.Protocol, p.Username, p.Password, p.Host, p.Port)
+	}
+	return fmt.Sprintf("%s://%s:%d", p.Protocol, p.Host, p.Port)
+}
+
+type ProxyWithAccountCount struct {
+	Proxy
+	AccountCount int64
+}
--- a/backend/internal/service/proxy_service.go
+++ b/backend/internal/service/proxy_service.go
@@ -5,7 +5,6 @@ import (
 	"fmt"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

@@ -14,15 +13,15 @@ var (
 )

 type ProxyRepository interface {
-	Create(ctx context.Context, proxy *model.Proxy) error
-	GetByID(ctx context.Context, id int64) (*model.Proxy, error)
-	Update(ctx context.Context, proxy *model.Proxy) error
+	Create(ctx context.Context, proxy *Proxy) error
+	GetByID(ctx context.Context, id int64) (*Proxy, error)
+	Update(ctx context.Context, proxy *Proxy) error
 	Delete(ctx context.Context, id int64) error

-	List(ctx context.Context, params pagination.PaginationParams) ([]model.Proxy, *pagination.PaginationResult, error)
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, protocol, status, search string) ([]model.Proxy, *pagination.PaginationResult, error)
-	ListActive(ctx context.Context) ([]model.Proxy, error)
-	ListActiveWithAccountCount(ctx context.Context) ([]model.ProxyWithAccountCount, error)
+	List(ctx context.Context, params pagination.PaginationParams) ([]Proxy, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, protocol, status, search string) ([]Proxy, *pagination.PaginationResult, error)
+	ListActive(ctx context.Context) ([]Proxy, error)
+	ListActiveWithAccountCount(ctx context.Context) ([]ProxyWithAccountCount, error)

 	ExistsByHostPortAuth(ctx context.Context, host string, port int, username, password string) (bool, error)
 	CountAccountsByProxyID(ctx context.Context, proxyID int64) (int64, error)
@@ -62,16 +61,16 @@ func NewProxyService(proxyRepo ProxyRepository) *ProxyService {
 }

 // Create 创建代理
-func (s *ProxyService) Create(ctx context.Context, req CreateProxyRequest) (*model.Proxy, error) {
+func (s *ProxyService) Create(ctx context.Context, req CreateProxyRequest) (*Proxy, error) {
 	// 创建代理
-	proxy := &model.Proxy{
+	proxy := &Proxy{
 		Name:     req.Name,
 		Protocol: req.Protocol,
 		Host:     req.Host,
 		Port:     req.Port,
 		Username: req.Username,
 		Password: req.Password,
-		Status:   model.StatusActive,
+		Status:   StatusActive,
 	}

 	if err := s.proxyRepo.Create(ctx, proxy); err != nil {
@@ -82,7 +81,7 @@ func (s *ProxyService) Create(ctx context.Context, req CreateProxyRequest) (*mod
 }

 // GetByID 根据ID获取代理
-func (s *ProxyService) GetByID(ctx context.Context, id int64) (*model.Proxy, error) {
+func (s *ProxyService) GetByID(ctx context.Context, id int64) (*Proxy, error) {
 	proxy, err := s.proxyRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get proxy: %w", err)
@@ -91,7 +90,7 @@ func (s *ProxyService) GetByID(ctx context.Context, id int64) (*model.Proxy, err
 }

 // List 获取代理列表
-func (s *ProxyService) List(ctx context.Context, params pagination.PaginationParams) ([]model.Proxy, *pagination.PaginationResult, error) {
+func (s *ProxyService) List(ctx context.Context, params pagination.PaginationParams) ([]Proxy, *pagination.PaginationResult, error) {
 	proxies, pagination, err := s.proxyRepo.List(ctx, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list proxies: %w", err)
@@ -100,7 +99,7 @@ func (s *ProxyService) List(ctx context.Context, params pagination.PaginationPar
 }

 // ListActive 获取活跃代理列表
-func (s *ProxyService) ListActive(ctx context.Context) ([]model.Proxy, error) {
+func (s *ProxyService) ListActive(ctx context.Context) ([]Proxy, error) {
 	proxies, err := s.proxyRepo.ListActive(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("list active proxies: %w", err)
@@ -109,7 +108,7 @@ func (s *ProxyService) ListActive(ctx context.Context) ([]model.Proxy, error) {
 }

 // Update 更新代理
-func (s *ProxyService) Update(ctx context.Context, id int64, req UpdateProxyRequest) (*model.Proxy, error) {
+func (s *ProxyService) Update(ctx context.Context, id int64, req UpdateProxyRequest) (*Proxy, error) {
 	proxy, err := s.proxyRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get proxy: %w", err)
--- a/backend/internal/service/ratelimit_service.go
+++ b/backend/internal/service/ratelimit_service.go
@@ -8,7 +8,6 @@ import (
 	"time"

 	"github.com/Wei-Shaw/sub2api/internal/config"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 // RateLimitService 处理限流和过载状态管理
@@ -27,7 +26,7 @@ func NewRateLimitService(accountRepo AccountRepository, cfg *config.Config) *Rat

 // HandleUpstreamError 处理上游错误响应，标记账号状态
 // 返回是否应该停止该账号的调度
-func (s *RateLimitService) HandleUpstreamError(ctx context.Context, account *model.Account, statusCode int, headers http.Header, responseBody []byte) (shouldDisable bool) {
+func (s *RateLimitService) HandleUpstreamError(ctx context.Context, account *Account, statusCode int, headers http.Header, responseBody []byte) (shouldDisable bool) {
 	// apikey 类型账号：检查自定义错误码配置
 	// 如果启用且错误码不在列表中，则不处理（不停止调度、不标记限流/过载）
 	if !account.ShouldHandleErrorCode(statusCode) {
@@ -60,7 +59,7 @@ func (s *RateLimitService) HandleUpstreamError(ctx context.Context, account *mod
 }

 // handleAuthError 处理认证类错误(401/403)，停止账号调度
-func (s *RateLimitService) handleAuthError(ctx context.Context, account *model.Account, errorMsg string) {
+func (s *RateLimitService) handleAuthError(ctx context.Context, account *Account, errorMsg string) {
 	if err := s.accountRepo.SetError(ctx, account.ID, errorMsg); err != nil {
 		log.Printf("SetError failed for account %d: %v", account.ID, err)
 		return
@@ -70,7 +69,7 @@ func (s *RateLimitService) handleAuthError(ctx context.Context, account *model.A

 // handle429 处理429限流错误
 // 解析响应头获取重置时间，标记账号为限流状态
-func (s *RateLimitService) handle429(ctx context.Context, account *model.Account, headers http.Header) {
+func (s *RateLimitService) handle429(ctx context.Context, account *Account, headers http.Header) {
 	// 解析重置时间戳
 	resetTimestamp := headers.Get("anthropic-ratelimit-unified-reset")
 	if resetTimestamp == "" {
@@ -113,7 +112,7 @@ func (s *RateLimitService) handle429(ctx context.Context, account *model.Account

 // handle529 处理529过载错误
 // 根据配置设置过载冷却时间
-func (s *RateLimitService) handle529(ctx context.Context, account *model.Account) {
+func (s *RateLimitService) handle529(ctx context.Context, account *Account) {
 	cooldownMinutes := s.cfg.RateLimit.OverloadCooldownMinutes
 	if cooldownMinutes <= 0 {
 		cooldownMinutes = 10 // 默认10分钟
@@ -129,7 +128,7 @@ func (s *RateLimitService) handle529(ctx context.Context, account *model.Account
 }

 // UpdateSessionWindow 从成功响应更新5h窗口状态
-func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *model.Account, headers http.Header) {
+func (s *RateLimitService) UpdateSessionWindow(ctx context.Context, account *Account, headers http.Header) {
 	status := headers.Get("anthropic-ratelimit-unified-5h-status")
 	if status == "" {
 		return
--- a/backend/internal/service/redeem_code.go
+++ b/backend/internal/service/redeem_code.go
@@ -0,0 +1,41 @@
+package service
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"time"
+)
+
+type RedeemCode struct {
+	ID        int64
+	Code      string
+	Type      string
+	Value     float64
+	Status    string
+	UsedBy    *int64
+	UsedAt    *time.Time
+	Notes     string
+	CreatedAt time.Time
+
+	GroupID      *int64
+	ValidityDays int
+
+	User  *User
+	Group *Group
+}
+
+func (r *RedeemCode) IsUsed() bool {
+	return r.Status == StatusUsed
+}
+
+func (r *RedeemCode) CanUse() bool {
+	return r.Status == StatusUnused
+}
+
+func GenerateRedeemCode() (string, error) {
+	b := make([]byte, 16)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(b), nil
+}
--- a/backend/internal/service/redeem_service.go
+++ b/backend/internal/service/redeem_service.go
@@ -10,7 +10,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/redis/go-redis/v9"
 )
@@ -39,17 +38,17 @@ type RedeemCache interface {
 }

 type RedeemCodeRepository interface {
-	Create(ctx context.Context, code *model.RedeemCode) error
-	CreateBatch(ctx context.Context, codes []model.RedeemCode) error
-	GetByID(ctx context.Context, id int64) (*model.RedeemCode, error)
-	GetByCode(ctx context.Context, code string) (*model.RedeemCode, error)
-	Update(ctx context.Context, code *model.RedeemCode) error
+	Create(ctx context.Context, code *RedeemCode) error
+	CreateBatch(ctx context.Context, codes []RedeemCode) error
+	GetByID(ctx context.Context, id int64) (*RedeemCode, error)
+	GetByCode(ctx context.Context, code string) (*RedeemCode, error)
+	Update(ctx context.Context, code *RedeemCode) error
 	Delete(ctx context.Context, id int64) error
 	Use(ctx context.Context, id, userID int64) error

-	List(ctx context.Context, params pagination.PaginationParams) ([]model.RedeemCode, *pagination.PaginationResult, error)
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, codeType, status, search string) ([]model.RedeemCode, *pagination.PaginationResult, error)
-	ListByUser(ctx context.Context, userID int64, limit int) ([]model.RedeemCode, error)
+	List(ctx context.Context, params pagination.PaginationParams) ([]RedeemCode, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, codeType, status, search string) ([]RedeemCode, *pagination.PaginationResult, error)
+	ListByUser(ctx context.Context, userID int64, limit int) ([]RedeemCode, error)
 }

 // GenerateCodesRequest 生成兑换码请求
@@ -116,7 +115,7 @@ func (s *RedeemService) GenerateRandomCode() (string, error) {
 }

 // GenerateCodes 批量生成兑换码
-func (s *RedeemService) GenerateCodes(ctx context.Context, req GenerateCodesRequest) ([]model.RedeemCode, error) {
+func (s *RedeemService) GenerateCodes(ctx context.Context, req GenerateCodesRequest) ([]RedeemCode, error) {
 	if req.Count <= 0 {
 		return nil, errors.New("count must be greater than 0")
 	}
@@ -131,21 +130,21 @@ func (s *RedeemService) GenerateCodes(ctx context.Context, req GenerateCodesRequ

 	codeType := req.Type
 	if codeType == "" {
-		codeType = model.RedeemTypeBalance
+		codeType = RedeemTypeBalance
 	}

-	codes := make([]model.RedeemCode, 0, req.Count)
+	codes := make([]RedeemCode, 0, req.Count)
 	for i := 0; i < req.Count; i++ {
 		code, err := s.GenerateRandomCode()
 		if err != nil {
 			return nil, fmt.Errorf("generate code: %w", err)
 		}

-		codes = append(codes, model.RedeemCode{
+		codes = append(codes, RedeemCode{
 			Code:   code,
 			Type:   codeType,
 			Value:  req.Value,
-			Status: model.StatusUnused,
+			Status: StatusUnused,
 		})
 	}

@@ -210,7 +209,7 @@ func (s *RedeemService) releaseRedeemLock(ctx context.Context, code string) {
 }

 // Redeem 使用兑换码
-func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (*model.RedeemCode, error) {
+func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (*RedeemCode, error) {
 	// 检查限流
 	if err := s.checkRedeemRateLimit(ctx, userID); err != nil {
 		return nil, err
@@ -239,7 +238,7 @@ func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (
 	}

 	// 验证兑换码类型的前置条件
-	if redeemCode.Type == model.RedeemTypeSubscription && redeemCode.GroupID == nil {
+	if redeemCode.Type == RedeemTypeSubscription && redeemCode.GroupID == nil {
 		return nil, infraerrors.BadRequest("REDEEM_CODE_INVALID", "invalid subscription redeem code: missing group_id")
 	}

@@ -261,7 +260,7 @@ func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (

 	// 执行兑换逻辑（兑换码已被锁定，此时可安全操作）
 	switch redeemCode.Type {
-	case model.RedeemTypeBalance:
+	case RedeemTypeBalance:
 		// 增加用户余额
 		if err := s.userRepo.UpdateBalance(ctx, userID, redeemCode.Value); err != nil {
 			return nil, fmt.Errorf("update user balance: %w", err)
@@ -275,13 +274,13 @@ func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (
 			}()
 		}

-	case model.RedeemTypeConcurrency:
+	case RedeemTypeConcurrency:
 		// 增加用户并发数
 		if err := s.userRepo.UpdateConcurrency(ctx, userID, int(redeemCode.Value)); err != nil {
 			return nil, fmt.Errorf("update user concurrency: %w", err)
 		}

-	case model.RedeemTypeSubscription:
+	case RedeemTypeSubscription:
 		validityDays := redeemCode.ValidityDays
 		if validityDays <= 0 {
 			validityDays = 30
@@ -320,7 +319,7 @@ func (s *RedeemService) Redeem(ctx context.Context, userID int64, code string) (
 }

 // GetByID 根据ID获取兑换码
-func (s *RedeemService) GetByID(ctx context.Context, id int64) (*model.RedeemCode, error) {
+func (s *RedeemService) GetByID(ctx context.Context, id int64) (*RedeemCode, error) {
 	code, err := s.redeemRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get redeem code: %w", err)
@@ -329,7 +328,7 @@ func (s *RedeemService) GetByID(ctx context.Context, id int64) (*model.RedeemCod
 }

 // GetByCode 根据Code获取兑换码
-func (s *RedeemService) GetByCode(ctx context.Context, code string) (*model.RedeemCode, error) {
+func (s *RedeemService) GetByCode(ctx context.Context, code string) (*RedeemCode, error) {
 	redeemCode, err := s.redeemRepo.GetByCode(ctx, code)
 	if err != nil {
 		return nil, fmt.Errorf("get redeem code: %w", err)
@@ -338,7 +337,7 @@ func (s *RedeemService) GetByCode(ctx context.Context, code string) (*model.Rede
 }

 // List 获取兑换码列表（管理员功能）
-func (s *RedeemService) List(ctx context.Context, params pagination.PaginationParams) ([]model.RedeemCode, *pagination.PaginationResult, error) {
+func (s *RedeemService) List(ctx context.Context, params pagination.PaginationParams) ([]RedeemCode, *pagination.PaginationResult, error) {
 	codes, pagination, err := s.redeemRepo.List(ctx, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list redeem codes: %w", err)
@@ -383,7 +382,7 @@ func (s *RedeemService) GetStats(ctx context.Context) (map[string]any, error) {
 }

 // GetUserHistory 获取用户的兑换历史
-func (s *RedeemService) GetUserHistory(ctx context.Context, userID int64, limit int) ([]model.RedeemCode, error) {
+func (s *RedeemService) GetUserHistory(ctx context.Context, userID int64, limit int) ([]RedeemCode, error) {
 	codes, err := s.redeemRepo.ListByUser(ctx, userID, limit)
 	if err != nil {
 		return nil, fmt.Errorf("get user redeem history: %w", err)
--- a/backend/internal/service/setting.go
+++ b/backend/internal/service/setting.go
@@ -0,0 +1,10 @@
+package service
+
+import "time"
+
+type Setting struct {
+	ID        int64
+	Key       string
+	Value     string
+	UpdatedAt time.Time
+}
--- a/backend/internal/service/setting_service.go
+++ b/backend/internal/service/setting_service.go
@@ -10,7 +10,6 @@ import (

 	"github.com/Wei-Shaw/sub2api/internal/config"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 var (
@@ -19,7 +18,7 @@ var (
 )

 type SettingRepository interface {
-	Get(ctx context.Context, key string) (*model.Setting, error)
+	Get(ctx context.Context, key string) (*Setting, error)
 	GetValue(ctx context.Context, key string) (string, error)
 	Set(ctx context.Context, key, value string) error
 	GetMultiple(ctx context.Context, keys []string) (map[string]string, error)
@@ -43,7 +42,7 @@ func NewSettingService(settingRepo SettingRepository, cfg *config.Config) *Setti
 }

 // GetAllSettings 获取所有系统设置
-func (s *SettingService) GetAllSettings(ctx context.Context) (*model.SystemSettings, error) {
+func (s *SettingService) GetAllSettings(ctx context.Context) (*SystemSettings, error) {
 	settings, err := s.settingRepo.GetAll(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("get all settings: %w", err)
@@ -53,18 +52,18 @@ func (s *SettingService) GetAllSettings(ctx context.Context) (*model.SystemSetti
 }

 // GetPublicSettings 获取公开设置（无需登录）
-func (s *SettingService) GetPublicSettings(ctx context.Context) (*model.PublicSettings, error) {
+func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings, error) {
 	keys := []string{
-		model.SettingKeyRegistrationEnabled,
-		model.SettingKeyEmailVerifyEnabled,
-		model.SettingKeyTurnstileEnabled,
-		model.SettingKeyTurnstileSiteKey,
-		model.SettingKeySiteName,
-		model.SettingKeySiteLogo,
-		model.SettingKeySiteSubtitle,
-		model.SettingKeyApiBaseUrl,
-		model.SettingKeyContactInfo,
-		model.SettingKeyDocUrl,
+		SettingKeyRegistrationEnabled,
+		SettingKeyEmailVerifyEnabled,
+		SettingKeyTurnstileEnabled,
+		SettingKeyTurnstileSiteKey,
+		SettingKeySiteName,
+		SettingKeySiteLogo,
+		SettingKeySiteSubtitle,
+		SettingKeyApiBaseUrl,
+		SettingKeyContactInfo,
+		SettingKeyDocUrl,
 	}

 	settings, err := s.settingRepo.GetMultiple(ctx, keys)
@@ -72,64 +71,64 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*model.PublicSe
 		return nil, fmt.Errorf("get public settings: %w", err)
 	}

-	return &model.PublicSettings{
-		RegistrationEnabled: settings[model.SettingKeyRegistrationEnabled] == "true",
-		EmailVerifyEnabled:  settings[model.SettingKeyEmailVerifyEnabled] == "true",
-		TurnstileEnabled:    settings[model.SettingKeyTurnstileEnabled] == "true",
-		TurnstileSiteKey:    settings[model.SettingKeyTurnstileSiteKey],
-		SiteName:            s.getStringOrDefault(settings, model.SettingKeySiteName, "Sub2API"),
-		SiteLogo:            settings[model.SettingKeySiteLogo],
-		SiteSubtitle:        s.getStringOrDefault(settings, model.SettingKeySiteSubtitle, "Subscription to API Conversion Platform"),
-		ApiBaseUrl:          settings[model.SettingKeyApiBaseUrl],
-		ContactInfo:         settings[model.SettingKeyContactInfo],
-		DocUrl:              settings[model.SettingKeyDocUrl],
+	return &PublicSettings{
+		RegistrationEnabled: settings[SettingKeyRegistrationEnabled] == "true",
+		EmailVerifyEnabled:  settings[SettingKeyEmailVerifyEnabled] == "true",
+		TurnstileEnabled:    settings[SettingKeyTurnstileEnabled] == "true",
+		TurnstileSiteKey:    settings[SettingKeyTurnstileSiteKey],
+		SiteName:            s.getStringOrDefault(settings, SettingKeySiteName, "Sub2API"),
+		SiteLogo:            settings[SettingKeySiteLogo],
+		SiteSubtitle:        s.getStringOrDefault(settings, SettingKeySiteSubtitle, "Subscription to API Conversion Platform"),
+		ApiBaseUrl:          settings[SettingKeyApiBaseUrl],
+		ContactInfo:         settings[SettingKeyContactInfo],
+		DocUrl:              settings[SettingKeyDocUrl],
 	}, nil
 }

 // UpdateSettings 更新系统设置
-func (s *SettingService) UpdateSettings(ctx context.Context, settings *model.SystemSettings) error {
+func (s *SettingService) UpdateSettings(ctx context.Context, settings *SystemSettings) error {
 	updates := make(map[string]string)

 	// 注册设置
-	updates[model.SettingKeyRegistrationEnabled] = strconv.FormatBool(settings.RegistrationEnabled)
-	updates[model.SettingKeyEmailVerifyEnabled] = strconv.FormatBool(settings.EmailVerifyEnabled)
+	updates[SettingKeyRegistrationEnabled] = strconv.FormatBool(settings.RegistrationEnabled)
+	updates[SettingKeyEmailVerifyEnabled] = strconv.FormatBool(settings.EmailVerifyEnabled)

 	// 邮件服务设置（只有非空才更新密码）
-	updates[model.SettingKeySmtpHost] = settings.SmtpHost
-	updates[model.SettingKeySmtpPort] = strconv.Itoa(settings.SmtpPort)
-	updates[model.SettingKeySmtpUsername] = settings.SmtpUsername
+	updates[SettingKeySmtpHost] = settings.SmtpHost
+	updates[SettingKeySmtpPort] = strconv.Itoa(settings.SmtpPort)
+	updates[SettingKeySmtpUsername] = settings.SmtpUsername
 	if settings.SmtpPassword != "" {
-		updates[model.SettingKeySmtpPassword] = settings.SmtpPassword
+		updates[SettingKeySmtpPassword] = settings.SmtpPassword
 	}
-	updates[model.SettingKeySmtpFrom] = settings.SmtpFrom
-	updates[model.SettingKeySmtpFromName] = settings.SmtpFromName
-	updates[model.SettingKeySmtpUseTLS] = strconv.FormatBool(settings.SmtpUseTLS)
+	updates[SettingKeySmtpFrom] = settings.SmtpFrom
+	updates[SettingKeySmtpFromName] = settings.SmtpFromName
+	updates[SettingKeySmtpUseTLS] = strconv.FormatBool(settings.SmtpUseTLS)

 	// Cloudflare Turnstile 设置（只有非空才更新密钥）
-	updates[model.SettingKeyTurnstileEnabled] = strconv.FormatBool(settings.TurnstileEnabled)
-	updates[model.SettingKeyTurnstileSiteKey] = settings.TurnstileSiteKey
+	updates[SettingKeyTurnstileEnabled] = strconv.FormatBool(settings.TurnstileEnabled)
+	updates[SettingKeyTurnstileSiteKey] = settings.TurnstileSiteKey
 	if settings.TurnstileSecretKey != "" {
-		updates[model.SettingKeyTurnstileSecretKey] = settings.TurnstileSecretKey
+		updates[SettingKeyTurnstileSecretKey] = settings.TurnstileSecretKey
 	}

 	// OEM设置
-	updates[model.SettingKeySiteName] = settings.SiteName
-	updates[model.SettingKeySiteLogo] = settings.SiteLogo
-	updates[model.SettingKeySiteSubtitle] = settings.SiteSubtitle
-	updates[model.SettingKeyApiBaseUrl] = settings.ApiBaseUrl
-	updates[model.SettingKeyContactInfo] = settings.ContactInfo
-	updates[model.SettingKeyDocUrl] = settings.DocUrl
+	updates[SettingKeySiteName] = settings.SiteName
+	updates[SettingKeySiteLogo] = settings.SiteLogo
+	updates[SettingKeySiteSubtitle] = settings.SiteSubtitle
+	updates[SettingKeyApiBaseUrl] = settings.ApiBaseUrl
+	updates[SettingKeyContactInfo] = settings.ContactInfo
+	updates[SettingKeyDocUrl] = settings.DocUrl

 	// 默认配置
-	updates[model.SettingKeyDefaultConcurrency] = strconv.Itoa(settings.DefaultConcurrency)
-	updates[model.SettingKeyDefaultBalance] = strconv.FormatFloat(settings.DefaultBalance, 'f', 8, 64)
+	updates[SettingKeyDefaultConcurrency] = strconv.Itoa(settings.DefaultConcurrency)
+	updates[SettingKeyDefaultBalance] = strconv.FormatFloat(settings.DefaultBalance, 'f', 8, 64)

 	return s.settingRepo.SetMultiple(ctx, updates)
 }

 // IsRegistrationEnabled 检查是否开放注册
 func (s *SettingService) IsRegistrationEnabled(ctx context.Context) bool {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyRegistrationEnabled)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyRegistrationEnabled)
 	if err != nil {
 		// 默认开放注册
 		return true
@@ -139,7 +138,7 @@ func (s *SettingService) IsRegistrationEnabled(ctx context.Context) bool {

 // IsEmailVerifyEnabled 检查是否开启邮件验证
 func (s *SettingService) IsEmailVerifyEnabled(ctx context.Context) bool {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyEmailVerifyEnabled)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyEmailVerifyEnabled)
 	if err != nil {
 		return false
 	}
@@ -148,7 +147,7 @@ func (s *SettingService) IsEmailVerifyEnabled(ctx context.Context) bool {

 // GetSiteName 获取网站名称
 func (s *SettingService) GetSiteName(ctx context.Context) string {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeySiteName)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeySiteName)
 	if err != nil || value == "" {
 		return "Sub2API"
 	}
@@ -157,7 +156,7 @@ func (s *SettingService) GetSiteName(ctx context.Context) string {

 // GetDefaultConcurrency 获取默认并发量
 func (s *SettingService) GetDefaultConcurrency(ctx context.Context) int {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyDefaultConcurrency)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyDefaultConcurrency)
 	if err != nil {
 		return s.cfg.Default.UserConcurrency
 	}
@@ -169,7 +168,7 @@ func (s *SettingService) GetDefaultConcurrency(ctx context.Context) int {

 // GetDefaultBalance 获取默认余额
 func (s *SettingService) GetDefaultBalance(ctx context.Context) float64 {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyDefaultBalance)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyDefaultBalance)
 	if err != nil {
 		return s.cfg.Default.UserBalance
 	}
@@ -182,7 +181,7 @@ func (s *SettingService) GetDefaultBalance(ctx context.Context) float64 {
 // InitializeDefaultSettings 初始化默认设置
 func (s *SettingService) InitializeDefaultSettings(ctx context.Context) error {
 	// 检查是否已有设置
-	_, err := s.settingRepo.GetValue(ctx, model.SettingKeyRegistrationEnabled)
+	_, err := s.settingRepo.GetValue(ctx, SettingKeyRegistrationEnabled)
 	if err == nil {
 		// 已有设置，不需要初始化
 		return nil
@@ -193,62 +192,62 @@ func (s *SettingService) InitializeDefaultSettings(ctx context.Context) error {

 	// 初始化默认设置
 	defaults := map[string]string{
-		model.SettingKeyRegistrationEnabled: "true",
-		model.SettingKeyEmailVerifyEnabled:  "false",
-		model.SettingKeySiteName:            "Sub2API",
-		model.SettingKeySiteLogo:            "",
-		model.SettingKeyDefaultConcurrency:  strconv.Itoa(s.cfg.Default.UserConcurrency),
-		model.SettingKeyDefaultBalance:      strconv.FormatFloat(s.cfg.Default.UserBalance, 'f', 8, 64),
-		model.SettingKeySmtpPort:            "587",
-		model.SettingKeySmtpUseTLS:          "false",
+		SettingKeyRegistrationEnabled: "true",
+		SettingKeyEmailVerifyEnabled:  "false",
+		SettingKeySiteName:            "Sub2API",
+		SettingKeySiteLogo:            "",
+		SettingKeyDefaultConcurrency:  strconv.Itoa(s.cfg.Default.UserConcurrency),
+		SettingKeyDefaultBalance:      strconv.FormatFloat(s.cfg.Default.UserBalance, 'f', 8, 64),
+		SettingKeySmtpPort:            "587",
+		SettingKeySmtpUseTLS:          "false",
 	}

 	return s.settingRepo.SetMultiple(ctx, defaults)
 }

 // parseSettings 解析设置到结构体
-func (s *SettingService) parseSettings(settings map[string]string) *model.SystemSettings {
-	result := &model.SystemSettings{
-		RegistrationEnabled: settings[model.SettingKeyRegistrationEnabled] == "true",
-		EmailVerifyEnabled:  settings[model.SettingKeyEmailVerifyEnabled] == "true",
-		SmtpHost:            settings[model.SettingKeySmtpHost],
-		SmtpUsername:        settings[model.SettingKeySmtpUsername],
-		SmtpFrom:            settings[model.SettingKeySmtpFrom],
-		SmtpFromName:        settings[model.SettingKeySmtpFromName],
-		SmtpUseTLS:          settings[model.SettingKeySmtpUseTLS] == "true",
-		TurnstileEnabled:    settings[model.SettingKeyTurnstileEnabled] == "true",
-		TurnstileSiteKey:    settings[model.SettingKeyTurnstileSiteKey],
-		SiteName:            s.getStringOrDefault(settings, model.SettingKeySiteName, "Sub2API"),
-		SiteLogo:            settings[model.SettingKeySiteLogo],
-		SiteSubtitle:        s.getStringOrDefault(settings, model.SettingKeySiteSubtitle, "Subscription to API Conversion Platform"),
-		ApiBaseUrl:          settings[model.SettingKeyApiBaseUrl],
-		ContactInfo:         settings[model.SettingKeyContactInfo],
-		DocUrl:              settings[model.SettingKeyDocUrl],
+func (s *SettingService) parseSettings(settings map[string]string) *SystemSettings {
+	result := &SystemSettings{
+		RegistrationEnabled: settings[SettingKeyRegistrationEnabled] == "true",
+		EmailVerifyEnabled:  settings[SettingKeyEmailVerifyEnabled] == "true",
+		SmtpHost:            settings[SettingKeySmtpHost],
+		SmtpUsername:        settings[SettingKeySmtpUsername],
+		SmtpFrom:            settings[SettingKeySmtpFrom],
+		SmtpFromName:        settings[SettingKeySmtpFromName],
+		SmtpUseTLS:          settings[SettingKeySmtpUseTLS] == "true",
+		TurnstileEnabled:    settings[SettingKeyTurnstileEnabled] == "true",
+		TurnstileSiteKey:    settings[SettingKeyTurnstileSiteKey],
+		SiteName:            s.getStringOrDefault(settings, SettingKeySiteName, "Sub2API"),
+		SiteLogo:            settings[SettingKeySiteLogo],
+		SiteSubtitle:        s.getStringOrDefault(settings, SettingKeySiteSubtitle, "Subscription to API Conversion Platform"),
+		ApiBaseUrl:          settings[SettingKeyApiBaseUrl],
+		ContactInfo:         settings[SettingKeyContactInfo],
+		DocUrl:              settings[SettingKeyDocUrl],
 	}

 	// 解析整数类型
-	if port, err := strconv.Atoi(settings[model.SettingKeySmtpPort]); err == nil {
+	if port, err := strconv.Atoi(settings[SettingKeySmtpPort]); err == nil {
 		result.SmtpPort = port
 	} else {
 		result.SmtpPort = 587
 	}

-	if concurrency, err := strconv.Atoi(settings[model.SettingKeyDefaultConcurrency]); err == nil {
+	if concurrency, err := strconv.Atoi(settings[SettingKeyDefaultConcurrency]); err == nil {
 		result.DefaultConcurrency = concurrency
 	} else {
 		result.DefaultConcurrency = s.cfg.Default.UserConcurrency
 	}

 	// 解析浮点数类型
-	if balance, err := strconv.ParseFloat(settings[model.SettingKeyDefaultBalance], 64); err == nil {
+	if balance, err := strconv.ParseFloat(settings[SettingKeyDefaultBalance], 64); err == nil {
 		result.DefaultBalance = balance
 	} else {
 		result.DefaultBalance = s.cfg.Default.UserBalance
 	}

 	// 敏感信息直接返回，方便测试连接时使用
-	result.SmtpPassword = settings[model.SettingKeySmtpPassword]
-	result.TurnstileSecretKey = settings[model.SettingKeyTurnstileSecretKey]
+	result.SmtpPassword = settings[SettingKeySmtpPassword]
+	result.TurnstileSecretKey = settings[SettingKeyTurnstileSecretKey]

 	return result
 }
@@ -263,7 +262,7 @@ func (s *SettingService) getStringOrDefault(settings map[string]string, key, def

 // IsTurnstileEnabled 检查是否启用 Turnstile 验证
 func (s *SettingService) IsTurnstileEnabled(ctx context.Context) bool {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyTurnstileEnabled)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyTurnstileEnabled)
 	if err != nil {
 		return false
 	}
@@ -272,7 +271,7 @@ func (s *SettingService) IsTurnstileEnabled(ctx context.Context) bool {

 // GetTurnstileSecretKey 获取 Turnstile Secret Key
 func (s *SettingService) GetTurnstileSecretKey(ctx context.Context) string {
-	value, err := s.settingRepo.GetValue(ctx, model.SettingKeyTurnstileSecretKey)
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyTurnstileSecretKey)
 	if err != nil {
 		return ""
 	}
@@ -287,10 +286,10 @@ func (s *SettingService) GenerateAdminApiKey(ctx context.Context) (string, error
 		return "", fmt.Errorf("generate random bytes: %w", err)
 	}

-	key := model.AdminApiKeyPrefix + hex.EncodeToString(bytes)
+	key := AdminApiKeyPrefix + hex.EncodeToString(bytes)

 	// 存储到 settings 表
-	if err := s.settingRepo.Set(ctx, model.SettingKeyAdminApiKey, key); err != nil {
+	if err := s.settingRepo.Set(ctx, SettingKeyAdminApiKey, key); err != nil {
 		return "", fmt.Errorf("save admin api key: %w", err)
 	}

@@ -300,7 +299,7 @@ func (s *SettingService) GenerateAdminApiKey(ctx context.Context) (string, error
 // GetAdminApiKeyStatus 获取管理员 API Key 状态
 // 返回脱敏的 key、是否存在、错误
 func (s *SettingService) GetAdminApiKeyStatus(ctx context.Context) (maskedKey string, exists bool, err error) {
-	key, err := s.settingRepo.GetValue(ctx, model.SettingKeyAdminApiKey)
+	key, err := s.settingRepo.GetValue(ctx, SettingKeyAdminApiKey)
 	if err != nil {
 		if errors.Is(err, ErrSettingNotFound) {
 			return "", false, nil
@@ -324,7 +323,7 @@ func (s *SettingService) GetAdminApiKeyStatus(ctx context.Context) (maskedKey st
 // GetAdminApiKey 获取完整的管理员 API Key（仅供内部验证使用）
 // 如果未配置返回空字符串和 nil 错误，只有数据库错误时才返回 error
 func (s *SettingService) GetAdminApiKey(ctx context.Context) (string, error) {
-	key, err := s.settingRepo.GetValue(ctx, model.SettingKeyAdminApiKey)
+	key, err := s.settingRepo.GetValue(ctx, SettingKeyAdminApiKey)
 	if err != nil {
 		if errors.Is(err, ErrSettingNotFound) {
 			return "", nil // 未配置，返回空字符串
@@ -336,5 +335,5 @@ func (s *SettingService) GetAdminApiKey(ctx context.Context) (string, error) {

 // DeleteAdminApiKey 删除管理员 API Key
 func (s *SettingService) DeleteAdminApiKey(ctx context.Context) error {
-	return s.settingRepo.Delete(ctx, model.SettingKeyAdminApiKey)
+	return s.settingRepo.Delete(ctx, SettingKeyAdminApiKey)
 }
--- a/backend/internal/service/settings_view.go
+++ b/backend/internal/service/settings_view.go
@@ -0,0 +1,42 @@
+package service
+
+type SystemSettings struct {
+	RegistrationEnabled bool
+	EmailVerifyEnabled  bool
+
+	SmtpHost     string
+	SmtpPort     int
+	SmtpUsername string
+	SmtpPassword string
+	SmtpFrom     string
+	SmtpFromName string
+	SmtpUseTLS   bool
+
+	TurnstileEnabled   bool
+	TurnstileSiteKey   string
+	TurnstileSecretKey string
+
+	SiteName     string
+	SiteLogo     string
+	SiteSubtitle string
+	ApiBaseUrl   string
+	ContactInfo  string
+	DocUrl       string
+
+	DefaultConcurrency int
+	DefaultBalance     float64
+}
+
+type PublicSettings struct {
+	RegistrationEnabled bool
+	EmailVerifyEnabled  bool
+	TurnstileEnabled    bool
+	TurnstileSiteKey    string
+	SiteName            string
+	SiteLogo            string
+	SiteSubtitle        string
+	ApiBaseUrl          string
+	ContactInfo         string
+	DocUrl              string
+	Version             string
+}
--- a/backend/internal/service/subscription_service.go
+++ b/backend/internal/service/subscription_service.go
@@ -7,7 +7,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

@@ -48,7 +47,7 @@ type AssignSubscriptionInput struct {
 }

 // AssignSubscription 分配订阅给用户（不允许重复分配）
-func (s *SubscriptionService) AssignSubscription(ctx context.Context, input *AssignSubscriptionInput) (*model.UserSubscription, error) {
+func (s *SubscriptionService) AssignSubscription(ctx context.Context, input *AssignSubscriptionInput) (*UserSubscription, error) {
 	// 检查分组是否存在且为订阅类型
 	group, err := s.groupRepo.GetByID(ctx, input.GroupID)
 	if err != nil {
@@ -91,7 +90,7 @@ func (s *SubscriptionService) AssignSubscription(ctx context.Context, input *Ass
 //   - 已过期：从当前时间开始计算新的过期时间，并激活订阅
 //
 // 如果没有订阅：创建新订阅
-func (s *SubscriptionService) AssignOrExtendSubscription(ctx context.Context, input *AssignSubscriptionInput) (*model.UserSubscription, bool, error) {
+func (s *SubscriptionService) AssignOrExtendSubscription(ctx context.Context, input *AssignSubscriptionInput) (*UserSubscription, bool, error) {
 	// 检查分组是否存在且为订阅类型
 	group, err := s.groupRepo.GetByID(ctx, input.GroupID)
 	if err != nil {
@@ -132,8 +131,8 @@ func (s *SubscriptionService) AssignOrExtendSubscription(ctx context.Context, in
 		}

 		// 如果订阅已过期或被暂停，恢复为active状态
-		if existingSub.Status != model.SubscriptionStatusActive {
-			if err := s.userSubRepo.UpdateStatus(ctx, existingSub.ID, model.SubscriptionStatusActive); err != nil {
+		if existingSub.Status != SubscriptionStatusActive {
+			if err := s.userSubRepo.UpdateStatus(ctx, existingSub.ID, SubscriptionStatusActive); err != nil {
 				return nil, false, fmt.Errorf("update subscription status: %w", err)
 			}
 		}
@@ -185,19 +184,19 @@ func (s *SubscriptionService) AssignOrExtendSubscription(ctx context.Context, in
 }

 // createSubscription 创建新订阅（内部方法）
-func (s *SubscriptionService) createSubscription(ctx context.Context, input *AssignSubscriptionInput) (*model.UserSubscription, error) {
+func (s *SubscriptionService) createSubscription(ctx context.Context, input *AssignSubscriptionInput) (*UserSubscription, error) {
 	validityDays := input.ValidityDays
 	if validityDays <= 0 {
 		validityDays = 30
 	}

 	now := time.Now()
-	sub := &model.UserSubscription{
+	sub := &UserSubscription{
 		UserID:     input.UserID,
 		GroupID:    input.GroupID,
 		StartsAt:   now,
 		ExpiresAt:  now.AddDate(0, 0, validityDays),
-		Status:     model.SubscriptionStatusActive,
+		Status:     SubscriptionStatusActive,
 		AssignedAt: now,
 		Notes:      input.Notes,
 		CreatedAt:  now,
@@ -229,14 +228,14 @@ type BulkAssignSubscriptionInput struct {
 type BulkAssignResult struct {
 	SuccessCount  int
 	FailedCount   int
-	Subscriptions []model.UserSubscription
+	Subscriptions []UserSubscription
 	Errors        []string
 }

 // BulkAssignSubscription 批量分配订阅
 func (s *SubscriptionService) BulkAssignSubscription(ctx context.Context, input *BulkAssignSubscriptionInput) (*BulkAssignResult, error) {
 	result := &BulkAssignResult{
-		Subscriptions: make([]model.UserSubscription, 0),
+		Subscriptions: make([]UserSubscription, 0),
 		Errors:        make([]string, 0),
 	}

@@ -286,7 +285,7 @@ func (s *SubscriptionService) RevokeSubscription(ctx context.Context, subscripti
 }

 // ExtendSubscription 延长订阅
-func (s *SubscriptionService) ExtendSubscription(ctx context.Context, subscriptionID int64, days int) (*model.UserSubscription, error) {
+func (s *SubscriptionService) ExtendSubscription(ctx context.Context, subscriptionID int64, days int) (*UserSubscription, error) {
 	sub, err := s.userSubRepo.GetByID(ctx, subscriptionID)
 	if err != nil {
 		return nil, ErrSubscriptionNotFound
@@ -299,8 +298,8 @@ func (s *SubscriptionService) ExtendSubscription(ctx context.Context, subscripti
 	}

 	// 如果订阅已过期，恢复为active状态
-	if sub.Status == model.SubscriptionStatusExpired {
-		if err := s.userSubRepo.UpdateStatus(ctx, subscriptionID, model.SubscriptionStatusActive); err != nil {
+	if sub.Status == SubscriptionStatusExpired {
+		if err := s.userSubRepo.UpdateStatus(ctx, subscriptionID, SubscriptionStatusActive); err != nil {
 			return nil, err
 		}
 	}
@@ -319,12 +318,12 @@ func (s *SubscriptionService) ExtendSubscription(ctx context.Context, subscripti
 }

 // GetByID 根据ID获取订阅
-func (s *SubscriptionService) GetByID(ctx context.Context, id int64) (*model.UserSubscription, error) {
+func (s *SubscriptionService) GetByID(ctx context.Context, id int64) (*UserSubscription, error) {
 	return s.userSubRepo.GetByID(ctx, id)
 }

 // GetActiveSubscription 获取用户对特定分组的有效订阅
-func (s *SubscriptionService) GetActiveSubscription(ctx context.Context, userID, groupID int64) (*model.UserSubscription, error) {
+func (s *SubscriptionService) GetActiveSubscription(ctx context.Context, userID, groupID int64) (*UserSubscription, error) {
 	sub, err := s.userSubRepo.GetActiveByUserIDAndGroupID(ctx, userID, groupID)
 	if err != nil {
 		return nil, ErrSubscriptionNotFound
@@ -333,7 +332,7 @@ func (s *SubscriptionService) GetActiveSubscription(ctx context.Context, userID,
 }

 // ListUserSubscriptions 获取用户的所有订阅
-func (s *SubscriptionService) ListUserSubscriptions(ctx context.Context, userID int64) ([]model.UserSubscription, error) {
+func (s *SubscriptionService) ListUserSubscriptions(ctx context.Context, userID int64) ([]UserSubscription, error) {
 	subs, err := s.userSubRepo.ListByUserID(ctx, userID)
 	if err != nil {
 		return nil, err
@@ -343,7 +342,7 @@ func (s *SubscriptionService) ListUserSubscriptions(ctx context.Context, userID
 }

 // ListActiveUserSubscriptions 获取用户的所有有效订阅
-func (s *SubscriptionService) ListActiveUserSubscriptions(ctx context.Context, userID int64) ([]model.UserSubscription, error) {
+func (s *SubscriptionService) ListActiveUserSubscriptions(ctx context.Context, userID int64) ([]UserSubscription, error) {
 	subs, err := s.userSubRepo.ListActiveByUserID(ctx, userID)
 	if err != nil {
 		return nil, err
@@ -353,7 +352,7 @@ func (s *SubscriptionService) ListActiveUserSubscriptions(ctx context.Context, u
 }

 // ListGroupSubscriptions 获取分组的所有订阅
-func (s *SubscriptionService) ListGroupSubscriptions(ctx context.Context, groupID int64, page, pageSize int) ([]model.UserSubscription, *pagination.PaginationResult, error) {
+func (s *SubscriptionService) ListGroupSubscriptions(ctx context.Context, groupID int64, page, pageSize int) ([]UserSubscription, *pagination.PaginationResult, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	subs, pag, err := s.userSubRepo.ListByGroupID(ctx, groupID, params)
 	if err != nil {
@@ -364,7 +363,7 @@ func (s *SubscriptionService) ListGroupSubscriptions(ctx context.Context, groupI
 }

 // List 获取所有订阅（分页，支持筛选）
-func (s *SubscriptionService) List(ctx context.Context, page, pageSize int, userID, groupID *int64, status string) ([]model.UserSubscription, *pagination.PaginationResult, error) {
+func (s *SubscriptionService) List(ctx context.Context, page, pageSize int, userID, groupID *int64, status string) ([]UserSubscription, *pagination.PaginationResult, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}
 	subs, pag, err := s.userSubRepo.List(ctx, params, userID, groupID, status)
 	if err != nil {
@@ -376,7 +375,7 @@ func (s *SubscriptionService) List(ctx context.Context, page, pageSize int, user

 // normalizeExpiredWindows 将已过期窗口的数据清零（仅影响返回数据，不影响数据库）
 // 这确保前端显示正确的当前窗口状态，而不是过期窗口的历史数据
-func normalizeExpiredWindows(subs []model.UserSubscription) {
+func normalizeExpiredWindows(subs []UserSubscription) {
 	for i := range subs {
 		sub := &subs[i]
 		// 日窗口过期：清零展示数据
@@ -403,7 +402,7 @@ func startOfDay(t time.Time) time.Time {
 }

 // CheckAndActivateWindow 检查并激活窗口（首次使用时）
-func (s *SubscriptionService) CheckAndActivateWindow(ctx context.Context, sub *model.UserSubscription) error {
+func (s *SubscriptionService) CheckAndActivateWindow(ctx context.Context, sub *UserSubscription) error {
 	if sub.IsWindowActivated() {
 		return nil
 	}
@@ -414,7 +413,7 @@ func (s *SubscriptionService) CheckAndActivateWindow(ctx context.Context, sub *m
 }

 // CheckAndResetWindows 检查并重置过期的窗口
-func (s *SubscriptionService) CheckAndResetWindows(ctx context.Context, sub *model.UserSubscription) error {
+func (s *SubscriptionService) CheckAndResetWindows(ctx context.Context, sub *UserSubscription) error {
 	// 使用当天零点作为新窗口起始时间
 	windowStart := startOfDay(time.Now())
 	needsInvalidateCache := false
@@ -458,7 +457,7 @@ func (s *SubscriptionService) CheckAndResetWindows(ctx context.Context, sub *mod
 }

 // CheckUsageLimits 检查使用限额（返回错误如果超限）
-func (s *SubscriptionService) CheckUsageLimits(ctx context.Context, sub *model.UserSubscription, group *model.Group, additionalCost float64) error {
+func (s *SubscriptionService) CheckUsageLimits(ctx context.Context, sub *UserSubscription, group *Group, additionalCost float64) error {
 	if !sub.CheckDailyLimit(group, additionalCost) {
 		return ErrDailyLimitExceeded
 	}
@@ -620,16 +619,16 @@ func (s *SubscriptionService) UpdateExpiredSubscriptions(ctx context.Context) (i
 }

 // ValidateSubscription 验证订阅是否有效
-func (s *SubscriptionService) ValidateSubscription(ctx context.Context, sub *model.UserSubscription) error {
-	if sub.Status == model.SubscriptionStatusExpired {
+func (s *SubscriptionService) ValidateSubscription(ctx context.Context, sub *UserSubscription) error {
+	if sub.Status == SubscriptionStatusExpired {
 		return ErrSubscriptionExpired
 	}
-	if sub.Status == model.SubscriptionStatusSuspended {
+	if sub.Status == SubscriptionStatusSuspended {
 		return ErrSubscriptionSuspended
 	}
 	if sub.IsExpired() {
 		// 更新状态
-		_ = s.userSubRepo.UpdateStatus(ctx, sub.ID, model.SubscriptionStatusExpired)
+		_ = s.userSubRepo.UpdateStatus(ctx, sub.ID, SubscriptionStatusExpired)
 		return ErrSubscriptionExpired
 	}
 	return nil
--- a/backend/internal/service/token_refresh_service.go
+++ b/backend/internal/service/token_refresh_service.go
@@ -8,7 +8,6 @@ import (
 	"time"

 	"github.com/Wei-Shaw/sub2api/internal/config"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 // TokenRefreshService OAuth token自动刷新服务
@@ -142,19 +141,19 @@ func (s *TokenRefreshService) processRefresh() {

 // listActiveAccounts 获取所有active状态的账号
 // 使用ListActive确保刷新所有活跃账号的token（包括临时禁用的）
-func (s *TokenRefreshService) listActiveAccounts(ctx context.Context) ([]model.Account, error) {
+func (s *TokenRefreshService) listActiveAccounts(ctx context.Context) ([]Account, error) {
 	return s.accountRepo.ListActive(ctx)
 }

 // refreshWithRetry 带重试的刷新
-func (s *TokenRefreshService) refreshWithRetry(ctx context.Context, account *model.Account, refresher TokenRefresher) error {
+func (s *TokenRefreshService) refreshWithRetry(ctx context.Context, account *Account, refresher TokenRefresher) error {
 	var lastErr error

 	for attempt := 1; attempt <= s.cfg.MaxRetries; attempt++ {
 		newCredentials, err := refresher.Refresh(ctx, account)
 		if err == nil {
 			// 刷新成功，更新账号credentials
-			account.Credentials = model.JSONB(newCredentials)
+			account.Credentials = newCredentials
 			if err := s.accountRepo.Update(ctx, account); err != nil {
 				return fmt.Errorf("failed to save credentials: %w", err)
 			}
--- a/backend/internal/service/token_refresher.go
+++ b/backend/internal/service/token_refresher.go
@@ -4,22 +4,20 @@ import (
 	"context"
 	"strconv"
 	"time"
-
-	"github.com/Wei-Shaw/sub2api/internal/model"
 )

 // TokenRefresher 定义平台特定的token刷新策略接口
 // 通过此接口可以扩展支持不同平台（Anthropic/OpenAI/Gemini）
 type TokenRefresher interface {
 	// CanRefresh 检查此刷新器是否能处理指定账号
-	CanRefresh(account *model.Account) bool
+	CanRefresh(account *Account) bool

 	// NeedsRefresh 检查账号的token是否需要刷新
-	NeedsRefresh(account *model.Account, refreshWindow time.Duration) bool
+	NeedsRefresh(account *Account, refreshWindow time.Duration) bool

 	// Refresh 执行token刷新，返回更新后的credentials
 	// 注意：返回的map应该保留原有credentials中的所有字段，只更新token相关字段
-	Refresh(ctx context.Context, account *model.Account) (map[string]any, error)
+	Refresh(ctx context.Context, account *Account) (map[string]any, error)
 }

 // ClaudeTokenRefresher 处理Anthropic/Claude OAuth token刷新
@@ -37,14 +35,14 @@ func NewClaudeTokenRefresher(oauthService *OAuthService) *ClaudeTokenRefresher {
 // CanRefresh 检查是否能处理此账号
 // 只处理 anthropic 平台的 oauth 类型账号
 // setup-token 虽然也是OAuth，但有效期1年，不需要频繁刷新
-func (r *ClaudeTokenRefresher) CanRefresh(account *model.Account) bool {
-	return account.Platform == model.PlatformAnthropic &&
-		account.Type == model.AccountTypeOAuth
+func (r *ClaudeTokenRefresher) CanRefresh(account *Account) bool {
+	return account.Platform == PlatformAnthropic &&
+		account.Type == AccountTypeOAuth
 }

 // NeedsRefresh 检查token是否需要刷新
 // 基于 expires_at 字段判断是否在刷新窗口内
-func (r *ClaudeTokenRefresher) NeedsRefresh(account *model.Account, refreshWindow time.Duration) bool {
+func (r *ClaudeTokenRefresher) NeedsRefresh(account *Account, refreshWindow time.Duration) bool {
 	expiresAtStr := account.GetCredential("expires_at")
 	if expiresAtStr == "" {
 		return false
@@ -61,7 +59,7 @@ func (r *ClaudeTokenRefresher) NeedsRefresh(account *model.Account, refreshWindo

 // Refresh 执行token刷新
 // 保留原有credentials中的所有字段，只更新token相关字段
-func (r *ClaudeTokenRefresher) Refresh(ctx context.Context, account *model.Account) (map[string]any, error) {
+func (r *ClaudeTokenRefresher) Refresh(ctx context.Context, account *Account) (map[string]any, error) {
 	tokenInfo, err := r.oauthService.RefreshAccountToken(ctx, account)
 	if err != nil {
 		return nil, err
@@ -103,14 +101,14 @@ func NewOpenAITokenRefresher(openaiOAuthService *OpenAIOAuthService) *OpenAIToke

 // CanRefresh 检查是否能处理此账号
 // 只处理 openai 平台的 oauth 类型账号
-func (r *OpenAITokenRefresher) CanRefresh(account *model.Account) bool {
-	return account.Platform == model.PlatformOpenAI &&
-		account.Type == model.AccountTypeOAuth
+func (r *OpenAITokenRefresher) CanRefresh(account *Account) bool {
+	return account.Platform == PlatformOpenAI &&
+		account.Type == AccountTypeOAuth
 }

 // NeedsRefresh 检查token是否需要刷新
 // 基于 expires_at 字段判断是否在刷新窗口内
-func (r *OpenAITokenRefresher) NeedsRefresh(account *model.Account, refreshWindow time.Duration) bool {
+func (r *OpenAITokenRefresher) NeedsRefresh(account *Account, refreshWindow time.Duration) bool {
 	expiresAt := account.GetOpenAITokenExpiresAt()
 	if expiresAt == nil {
 		return false
@@ -121,7 +119,7 @@ func (r *OpenAITokenRefresher) NeedsRefresh(account *model.Account, refreshWindo

 // Refresh 执行token刷新
 // 保留原有credentials中的所有字段，只更新token相关字段
-func (r *OpenAITokenRefresher) Refresh(ctx context.Context, account *model.Account) (map[string]any, error) {
+func (r *OpenAITokenRefresher) Refresh(ctx context.Context, account *Account) (map[string]any, error) {
 	tokenInfo, err := r.openaiOAuthService.RefreshAccountToken(ctx, account)
 	if err != nil {
 		return nil, err
--- a/backend/internal/service/usage_log.go
+++ b/backend/internal/service/usage_log.go
@@ -0,0 +1,53 @@
+package service
+
+import "time"
+
+const (
+	BillingTypeBalance      int8 = 0 // 钱包余额
+	BillingTypeSubscription int8 = 1 // 订阅套餐
+)
+
+type UsageLog struct {
+	ID        int64
+	UserID    int64
+	ApiKeyID  int64
+	AccountID int64
+	RequestID string
+	Model     string
+
+	GroupID        *int64
+	SubscriptionID *int64
+
+	InputTokens         int
+	OutputTokens        int
+	CacheCreationTokens int
+	CacheReadTokens     int
+
+	CacheCreation5mTokens int
+	CacheCreation1hTokens int
+
+	InputCost         float64
+	OutputCost        float64
+	CacheCreationCost float64
+	CacheReadCost     float64
+	TotalCost         float64
+	ActualCost        float64
+	RateMultiplier    float64
+
+	BillingType  int8
+	Stream       bool
+	DurationMs   *int
+	FirstTokenMs *int
+
+	CreatedAt time.Time
+
+	User         *User
+	ApiKey       *ApiKey
+	Account      *Account
+	Group        *Group
+	Subscription *UserSubscription
+}
+
+func (u *UsageLog) TotalTokens() int {
+	return u.InputTokens + u.OutputTokens + u.CacheCreationTokens + u.CacheReadTokens
+}
--- a/backend/internal/service/usage_service.go
+++ b/backend/internal/service/usage_service.go
@@ -6,7 +6,6 @@ import (
 	"time"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
 )
@@ -66,7 +65,7 @@ func NewUsageService(usageRepo UsageLogRepository, userRepo UserRepository) *Usa
 }

 // Create 创建使用日志
-func (s *UsageService) Create(ctx context.Context, req CreateUsageLogRequest) (*model.UsageLog, error) {
+func (s *UsageService) Create(ctx context.Context, req CreateUsageLogRequest) (*UsageLog, error) {
 	// 验证用户存在
 	_, err := s.userRepo.GetByID(ctx, req.UserID)
 	if err != nil {
@@ -74,7 +73,7 @@ func (s *UsageService) Create(ctx context.Context, req CreateUsageLogRequest) (*
 	}

 	// 创建使用日志
-	usageLog := &model.UsageLog{
+	usageLog := &UsageLog{
 		UserID:                req.UserID,
 		ApiKeyID:              req.ApiKeyID,
 		AccountID:             req.AccountID,
@@ -112,7 +111,7 @@ func (s *UsageService) Create(ctx context.Context, req CreateUsageLogRequest) (*
 }

 // GetByID 根据ID获取使用日志
-func (s *UsageService) GetByID(ctx context.Context, id int64) (*model.UsageLog, error) {
+func (s *UsageService) GetByID(ctx context.Context, id int64) (*UsageLog, error) {
 	log, err := s.usageRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get usage log: %w", err)
@@ -121,7 +120,7 @@ func (s *UsageService) GetByID(ctx context.Context, id int64) (*model.UsageLog,
 }

 // ListByUser 获取用户的使用日志列表
-func (s *UsageService) ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
+func (s *UsageService) ListByUser(ctx context.Context, userID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error) {
 	logs, pagination, err := s.usageRepo.ListByUser(ctx, userID, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list usage logs: %w", err)
@@ -130,7 +129,7 @@ func (s *UsageService) ListByUser(ctx context.Context, userID int64, params pagi
 }

 // ListByApiKey 获取API Key的使用日志列表
-func (s *UsageService) ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
+func (s *UsageService) ListByApiKey(ctx context.Context, apiKeyID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error) {
 	logs, pagination, err := s.usageRepo.ListByApiKey(ctx, apiKeyID, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list usage logs: %w", err)
@@ -139,7 +138,7 @@ func (s *UsageService) ListByApiKey(ctx context.Context, apiKeyID int64, params
 }

 // ListByAccount 获取账号的使用日志列表
-func (s *UsageService) ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]model.UsageLog, *pagination.PaginationResult, error) {
+func (s *UsageService) ListByAccount(ctx context.Context, accountID int64, params pagination.PaginationParams) ([]UsageLog, *pagination.PaginationResult, error) {
 	logs, pagination, err := s.usageRepo.ListByAccount(ctx, accountID, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list usage logs: %w", err)
@@ -243,7 +242,7 @@ func (s *UsageService) GetDailyStats(ctx context.Context, userID int64, days int
 }

 // calculateStats 计算统计数据
-func (s *UsageService) calculateStats(logs []model.UsageLog) *UsageStats {
+func (s *UsageService) calculateStats(logs []UsageLog) *UsageStats {
 	stats := &UsageStats{}

 	for _, log := range logs {
@@ -313,7 +312,7 @@ func (s *UsageService) GetBatchApiKeyUsageStats(ctx context.Context, apiKeyIDs [
 }

 // ListWithFilters lists usage logs with admin filters.
-func (s *UsageService) ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters usagestats.UsageLogFilters) ([]model.UsageLog, *pagination.PaginationResult, error) {
+func (s *UsageService) ListWithFilters(ctx context.Context, params pagination.PaginationParams, filters usagestats.UsageLogFilters) ([]UsageLog, *pagination.PaginationResult, error) {
 	logs, result, err := s.usageRepo.ListWithFilters(ctx, params, filters)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list usage logs with filters: %w", err)
--- a/backend/internal/service/user.go
+++ b/backend/internal/service/user.go
@@ -0,0 +1,63 @@
+package service
+
+import (
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type User struct {
+	ID            int64
+	Email         string
+	Username      string
+	Wechat        string
+	Notes         string
+	PasswordHash  string
+	Role          string
+	Balance       float64
+	Concurrency   int
+	Status        string
+	AllowedGroups []int64
+	CreatedAt     time.Time
+	UpdatedAt     time.Time
+
+	ApiKeys       []ApiKey
+	Subscriptions []UserSubscription
+}
+
+func (u *User) IsAdmin() bool {
+	return u.Role == RoleAdmin
+}
+
+func (u *User) IsActive() bool {
+	return u.Status == StatusActive
+}
+
+// CanBindGroup checks whether a user can bind to a given group.
+// For standard groups:
+// - If AllowedGroups is non-empty, only allow binding to IDs in that list.
+// - If AllowedGroups is empty (nil or length 0), allow binding to any non-exclusive group.
+func (u *User) CanBindGroup(groupID int64, isExclusive bool) bool {
+	if len(u.AllowedGroups) > 0 {
+		for _, id := range u.AllowedGroups {
+			if id == groupID {
+				return true
+			}
+		}
+		return false
+	}
+	return !isExclusive
+}
+
+func (u *User) SetPassword(password string) error {
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+	u.PasswordHash = string(hash)
+	return nil
+}
+
+func (u *User) CheckPassword(password string) bool {
+	return bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password)) == nil
+}
--- a/backend/internal/service/user_service.go
+++ b/backend/internal/service/user_service.go
@@ -5,9 +5,7 @@ import (
 	"fmt"

 	infraerrors "github.com/Wei-Shaw/sub2api/internal/infrastructure/errors"
-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
-	"golang.org/x/crypto/bcrypt"
 )

 var (
@@ -17,15 +15,15 @@ var (
 )

 type UserRepository interface {
-	Create(ctx context.Context, user *model.User) error
-	GetByID(ctx context.Context, id int64) (*model.User, error)
-	GetByEmail(ctx context.Context, email string) (*model.User, error)
-	GetFirstAdmin(ctx context.Context) (*model.User, error)
-	Update(ctx context.Context, user *model.User) error
+	Create(ctx context.Context, user *User) error
+	GetByID(ctx context.Context, id int64) (*User, error)
+	GetByEmail(ctx context.Context, email string) (*User, error)
+	GetFirstAdmin(ctx context.Context) (*User, error)
+	Update(ctx context.Context, user *User) error
 	Delete(ctx context.Context, id int64) error

-	List(ctx context.Context, params pagination.PaginationParams) ([]model.User, *pagination.PaginationResult, error)
-	ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, role, search string) ([]model.User, *pagination.PaginationResult, error)
+	List(ctx context.Context, params pagination.PaginationParams) ([]User, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, role, search string) ([]User, *pagination.PaginationResult, error)

 	UpdateBalance(ctx context.Context, id int64, amount float64) error
 	DeductBalance(ctx context.Context, id int64, amount float64) error
@@ -61,7 +59,7 @@ func NewUserService(userRepo UserRepository) *UserService {
 }

 // GetFirstAdmin 获取首个管理员用户（用于 Admin API Key 认证）
-func (s *UserService) GetFirstAdmin(ctx context.Context) (*model.User, error) {
+func (s *UserService) GetFirstAdmin(ctx context.Context) (*User, error) {
 	admin, err := s.userRepo.GetFirstAdmin(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("get first admin: %w", err)
@@ -70,7 +68,7 @@ func (s *UserService) GetFirstAdmin(ctx context.Context) (*model.User, error) {
 }

 // GetProfile 获取用户资料
-func (s *UserService) GetProfile(ctx context.Context, userID int64) (*model.User, error) {
+func (s *UserService) GetProfile(ctx context.Context, userID int64) (*User, error) {
 	user, err := s.userRepo.GetByID(ctx, userID)
 	if err != nil {
 		return nil, fmt.Errorf("get user: %w", err)
@@ -79,7 +77,7 @@ func (s *UserService) GetProfile(ctx context.Context, userID int64) (*model.User
 }

 // UpdateProfile 更新用户资料
-func (s *UserService) UpdateProfile(ctx context.Context, userID int64, req UpdateProfileRequest) (*model.User, error) {
+func (s *UserService) UpdateProfile(ctx context.Context, userID int64, req UpdateProfileRequest) (*User, error) {
 	user, err := s.userRepo.GetByID(ctx, userID)
 	if err != nil {
 		return nil, fmt.Errorf("get user: %w", err)
@@ -125,18 +123,14 @@ func (s *UserService) ChangePassword(ctx context.Context, userID int64, req Chan
 	}

 	// 验证当前密码
-	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(req.CurrentPassword)); err != nil {
+	if !user.CheckPassword(req.CurrentPassword) {
 		return ErrPasswordIncorrect
 	}

-	// 生成新密码哈希
-	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
-	if err != nil {
-		return fmt.Errorf("hash password: %w", err)
+	if err := user.SetPassword(req.NewPassword); err != nil {
+		return fmt.Errorf("set password: %w", err)
 	}

-	user.PasswordHash = string(hashedPassword)
-
 	if err := s.userRepo.Update(ctx, user); err != nil {
 		return fmt.Errorf("update user: %w", err)
 	}
@@ -145,7 +139,7 @@ func (s *UserService) ChangePassword(ctx context.Context, userID int64, req Chan
 }

 // GetByID 根据ID获取用户（管理员功能）
-func (s *UserService) GetByID(ctx context.Context, id int64) (*model.User, error) {
+func (s *UserService) GetByID(ctx context.Context, id int64) (*User, error) {
 	user, err := s.userRepo.GetByID(ctx, id)
 	if err != nil {
 		return nil, fmt.Errorf("get user: %w", err)
@@ -154,7 +148,7 @@ func (s *UserService) GetByID(ctx context.Context, id int64) (*model.User, error
 }

 // List 获取用户列表（管理员功能）
-func (s *UserService) List(ctx context.Context, params pagination.PaginationParams) ([]model.User, *pagination.PaginationResult, error) {
+func (s *UserService) List(ctx context.Context, params pagination.PaginationParams) ([]User, *pagination.PaginationResult, error) {
 	users, pagination, err := s.userRepo.List(ctx, params)
 	if err != nil {
 		return nil, nil, fmt.Errorf("list users: %w", err)
--- a/backend/internal/service/user_subscription.go
+++ b/backend/internal/service/user_subscription.go
@@ -0,0 +1,124 @@
+package service
+
+import "time"
+
+type UserSubscription struct {
+	ID      int64
+	UserID  int64
+	GroupID int64
+
+	StartsAt  time.Time
+	ExpiresAt time.Time
+	Status    string
+
+	DailyWindowStart   *time.Time
+	WeeklyWindowStart  *time.Time
+	MonthlyWindowStart *time.Time
+
+	DailyUsageUSD   float64
+	WeeklyUsageUSD  float64
+	MonthlyUsageUSD float64
+
+	AssignedBy *int64
+	AssignedAt time.Time
+	Notes      string
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+
+	User           *User
+	Group          *Group
+	AssignedByUser *User
+}
+
+func (s *UserSubscription) IsActive() bool {
+	return s.Status == SubscriptionStatusActive && time.Now().Before(s.ExpiresAt)
+}
+
+func (s *UserSubscription) IsExpired() bool {
+	return time.Now().After(s.ExpiresAt)
+}
+
+func (s *UserSubscription) DaysRemaining() int {
+	if s.IsExpired() {
+		return 0
+	}
+	return int(time.Until(s.ExpiresAt).Hours() / 24)
+}
+
+func (s *UserSubscription) IsWindowActivated() bool {
+	return s.DailyWindowStart != nil || s.WeeklyWindowStart != nil || s.MonthlyWindowStart != nil
+}
+
+func (s *UserSubscription) NeedsDailyReset() bool {
+	if s.DailyWindowStart == nil {
+		return false
+	}
+	return time.Since(*s.DailyWindowStart) >= 24*time.Hour
+}
+
+func (s *UserSubscription) NeedsWeeklyReset() bool {
+	if s.WeeklyWindowStart == nil {
+		return false
+	}
+	return time.Since(*s.WeeklyWindowStart) >= 7*24*time.Hour
+}
+
+func (s *UserSubscription) NeedsMonthlyReset() bool {
+	if s.MonthlyWindowStart == nil {
+		return false
+	}
+	return time.Since(*s.MonthlyWindowStart) >= 30*24*time.Hour
+}
+
+func (s *UserSubscription) DailyResetTime() *time.Time {
+	if s.DailyWindowStart == nil {
+		return nil
+	}
+	t := s.DailyWindowStart.Add(24 * time.Hour)
+	return &t
+}
+
+func (s *UserSubscription) WeeklyResetTime() *time.Time {
+	if s.WeeklyWindowStart == nil {
+		return nil
+	}
+	t := s.WeeklyWindowStart.Add(7 * 24 * time.Hour)
+	return &t
+}
+
+func (s *UserSubscription) MonthlyResetTime() *time.Time {
+	if s.MonthlyWindowStart == nil {
+		return nil
+	}
+	t := s.MonthlyWindowStart.Add(30 * 24 * time.Hour)
+	return &t
+}
+
+func (s *UserSubscription) CheckDailyLimit(group *Group, additionalCost float64) bool {
+	if !group.HasDailyLimit() {
+		return true
+	}
+	return s.DailyUsageUSD+additionalCost <= *group.DailyLimitUSD
+}
+
+func (s *UserSubscription) CheckWeeklyLimit(group *Group, additionalCost float64) bool {
+	if !group.HasWeeklyLimit() {
+		return true
+	}
+	return s.WeeklyUsageUSD+additionalCost <= *group.WeeklyLimitUSD
+}
+
+func (s *UserSubscription) CheckMonthlyLimit(group *Group, additionalCost float64) bool {
+	if !group.HasMonthlyLimit() {
+		return true
+	}
+	return s.MonthlyUsageUSD+additionalCost <= *group.MonthlyLimitUSD
+}
+
+func (s *UserSubscription) CheckAllLimits(group *Group, additionalCost float64) (daily, weekly, monthly bool) {
+	daily = s.CheckDailyLimit(group, additionalCost)
+	weekly = s.CheckWeeklyLimit(group, additionalCost)
+	monthly = s.CheckMonthlyLimit(group, additionalCost)
+	return
+}
--- a/backend/internal/service/user_subscription_port.go
+++ b/backend/internal/service/user_subscription_port.go
@@ -4,22 +4,21 @@ import (
 	"context"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 )

 type UserSubscriptionRepository interface {
-	Create(ctx context.Context, sub *model.UserSubscription) error
-	GetByID(ctx context.Context, id int64) (*model.UserSubscription, error)
-	GetByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*model.UserSubscription, error)
-	GetActiveByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*model.UserSubscription, error)
-	Update(ctx context.Context, sub *model.UserSubscription) error
+	Create(ctx context.Context, sub *UserSubscription) error
+	GetByID(ctx context.Context, id int64) (*UserSubscription, error)
+	GetByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*UserSubscription, error)
+	GetActiveByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (*UserSubscription, error)
+	Update(ctx context.Context, sub *UserSubscription) error
 	Delete(ctx context.Context, id int64) error

-	ListByUserID(ctx context.Context, userID int64) ([]model.UserSubscription, error)
-	ListActiveByUserID(ctx context.Context, userID int64) ([]model.UserSubscription, error)
-	ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]model.UserSubscription, *pagination.PaginationResult, error)
-	List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status string) ([]model.UserSubscription, *pagination.PaginationResult, error)
+	ListByUserID(ctx context.Context, userID int64) ([]UserSubscription, error)
+	ListActiveByUserID(ctx context.Context, userID int64) ([]UserSubscription, error)
+	ListByGroupID(ctx context.Context, groupID int64, params pagination.PaginationParams) ([]UserSubscription, *pagination.PaginationResult, error)
+	List(ctx context.Context, params pagination.PaginationParams, userID, groupID *int64, status string) ([]UserSubscription, *pagination.PaginationResult, error)

 	ExistsByUserIDAndGroupID(ctx context.Context, userID, groupID int64) (bool, error)
 	ExtendExpiry(ctx context.Context, subscriptionID int64, newExpiresAt time.Time) error
--- a/backend/internal/setup/setup.go
+++ b/backend/internal/setup/setup.go
@@ -10,10 +10,10 @@ import (
 	"strconv"
 	"time"

-	"github.com/Wei-Shaw/sub2api/internal/model"
+	"github.com/Wei-Shaw/sub2api/internal/repository"
+	"github.com/Wei-Shaw/sub2api/internal/service"

 	"github.com/redis/go-redis/v9"
-	"golang.org/x/crypto/bcrypt"
 	"gopkg.in/yaml.v3"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
@@ -271,8 +271,7 @@ func initializeDatabase(cfg *SetupConfig) error {
 		}
 	}()

-	// 使用 model 包的 AutoMigrate，确保模型定义统一
-	return model.AutoMigrate(db)
+	return repository.AutoMigrate(db)
 }

 func createAdminUser(cfg *SetupConfig) error {
@@ -299,29 +298,28 @@ func createAdminUser(cfg *SetupConfig) error {

 	// Check if admin already exists
 	var count int64
-	db.Model(&model.User{}).Where("role = ?", "admin").Count(&count)
+	if err := db.Table("users").Where("role = ?", service.RoleAdmin).Count(&count).Error; err != nil {
+		return err
+	}
 	if count > 0 {
 		return nil // Admin already exists
 	}

-	// Hash password
-	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(cfg.Admin.Password), bcrypt.DefaultCost)
-	if err != nil {
+	admin := &service.User{
+		Email:       cfg.Admin.Email,
+		Role:        service.RoleAdmin,
+		Status:      service.StatusActive,
+		Balance:     0,
+		Concurrency: 5,
+		CreatedAt:   time.Now(),
+		UpdatedAt:   time.Now(),
+	}
+
+	if err := admin.SetPassword(cfg.Admin.Password); err != nil {
 		return err
 	}

-	// Create admin user
-	admin := &model.User{
-		Email:        cfg.Admin.Email,
-		PasswordHash: string(hashedPassword),
-		Role:         model.RoleAdmin,
-		Status:       model.StatusActive,
-		Balance:      0,
-		CreatedAt:    time.Now(),
-		UpdatedAt:    time.Now(),
-	}
-
-	return db.Create(admin).Error
+	return repository.NewUserRepository(db).Create(context.Background(), admin)
 }

 func writeConfigFile(cfg *SetupConfig) error {