feat: 支持用户专属分组倍率配置

backend/cmd/server/wire_gen.go

@@ -59,8 +59,9 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	billingCacheService := service.NewBillingCacheService(billingCache, userRepository, userSubscriptionRepository, configConfig)
 	apiKeyRepository := repository.NewAPIKeyRepository(client)
 	groupRepository := repository.NewGroupRepository(client, db)
+	userGroupRateRepository := repository.NewUserGroupRateRepository(db)
 	apiKeyCache := repository.NewAPIKeyCache(redisClient)
-	apiKeyService := service.NewAPIKeyService(apiKeyRepository, userRepository, groupRepository, userSubscriptionRepository, apiKeyCache, configConfig)
+	apiKeyService := service.NewAPIKeyService(apiKeyRepository, userRepository, groupRepository, userSubscriptionRepository, userGroupRateRepository, apiKeyCache, configConfig)
 	apiKeyAuthCacheInvalidator := service.ProvideAPIKeyAuthCacheInvalidator(apiKeyService)
 	promoService := service.NewPromoService(promoCodeRepository, userRepository, billingCacheService, client, apiKeyAuthCacheInvalidator)
 	authService := service.NewAuthService(userRepository, redeemCodeRepository, refreshTokenCache, configConfig, settingService, emailService, turnstileService, emailQueueService, promoService)
@@ -100,7 +101,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	proxyRepository := repository.NewProxyRepository(client, db)
 	proxyExitInfoProber := repository.NewProxyExitInfoProber(configConfig)
 	proxyLatencyCache := repository.NewProxyLatencyCache(redisClient)
-	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator)
+	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator)
 	adminUserHandler := admin.NewUserHandler(adminService)
 	groupHandler := admin.NewGroupHandler(adminService)
 	claudeOAuthClient := repository.NewClaudeOAuthClient()
@@ -153,7 +154,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	identityService := service.NewIdentityService(identityCache)
 	deferredService := service.ProvideDeferredService(accountRepository, timingWheelService)
 	claudeTokenProvider := service.NewClaudeTokenProvider(accountRepository, geminiTokenCache, oAuthService)
-	gatewayService := service.NewGatewayService(accountRepository, groupRepository, usageLogRepository, userRepository, userSubscriptionRepository, gatewayCache, configConfig, schedulerSnapshotService, concurrencyService, billingService, rateLimitService, billingCacheService, identityService, httpUpstream, deferredService, claudeTokenProvider, sessionLimitCache)
+	gatewayService := service.NewGatewayService(accountRepository, groupRepository, usageLogRepository, userRepository, userSubscriptionRepository, userGroupRateRepository, gatewayCache, configConfig, schedulerSnapshotService, concurrencyService, billingService, rateLimitService, billingCacheService, identityService, httpUpstream, deferredService, claudeTokenProvider, sessionLimitCache)
 	openAITokenProvider := service.NewOpenAITokenProvider(accountRepository, geminiTokenCache, openAIOAuthService)
 	openAIGatewayService := service.NewOpenAIGatewayService(accountRepository, usageLogRepository, userRepository, userSubscriptionRepository, gatewayCache, configConfig, schedulerSnapshotService, concurrencyService, billingService, rateLimitService, billingCacheService, httpUpstream, deferredService, openAITokenProvider)
 	geminiMessagesCompatService := service.NewGeminiMessagesCompatService(accountRepository, groupRepository, gatewayCache, schedulerSnapshotService, geminiTokenProvider, rateLimitService, httpUpstream, antigravityGatewayService, configConfig)

backend/go.sum

@@ -170,6 +170,8 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
 github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mdelapenya/tlscert v0.2.0 h1:7H81W6Z/4weDvZBNOfQte5GpIMo0lGYEeWbkGp5LJHI=
@@ -203,6 +205,8 @@ github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
+github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.1 h1:y0fUlFfIZhPF1W537XOLg0/fcx6zcHCJwooC2xJA040=
@@ -230,6 +234,8 @@ github.com/refraction-networking/utls v1.8.1 h1:yNY1kapmQU8JeM1sSw2H2asfTIwWxIkr
 github.com/refraction-networking/utls v1.8.1/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
@@ -252,6 +258,8 @@ github.com/spf13/afero v1.11.0 h1:WJQKhtpdm3v2IzqG8VMqrr6Rf3UYpEF239Jy9wNepM8=
 github.com/spf13/afero v1.11.0/go.mod h1:GH9Y3pIexgf1MTIWtNGyogA5MwRIDXGUr+hbWNoBjkY=
 github.com/spf13/cast v1.6.0 h1:GEiTHELF+vaR5dhz3VqZfFSzZjYbgeKDpBxQVS4GYJ0=
 github.com/spf13/cast v1.6.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.18.2 h1:LUXCnvUvSM6FXAsj6nnfc8Q2tp1dIgUfY9Kc8GsSOiQ=

backend/internal/handler/admin/user_handler.go

@@ -45,6 +45,9 @@ type UpdateUserRequest struct {
 	Concurrency   *int     `json:"concurrency"`
 	Status        string   `json:"status" binding:"omitempty,oneof=active disabled"`
 	AllowedGroups *[]int64 `json:"allowed_groups"`
+	// GroupRates 用户专属分组倍率配置
+	// map[groupID]*rate，nil 表示删除该分组的专属倍率
+	GroupRates map[int64]*float64 `json:"group_rates"`
 }
 
 // UpdateBalanceRequest represents balance update request
@@ -183,6 +186,7 @@ func (h *UserHandler) Update(c *gin.Context) {
 		Concurrency:   req.Concurrency,
 		Status:        req.Status,
 		AllowedGroups: req.AllowedGroups,
+		GroupRates:    req.GroupRates,
 	})
 	if err != nil {
 		response.ErrorFrom(c, err)

backend/internal/handler/api_key_handler.go

@@ -243,3 +243,21 @@ func (h *APIKeyHandler) GetAvailableGroups(c *gin.Context) {
 	}
 	response.Success(c, out)
 }
+
+// GetUserGroupRates 获取当前用户的专属分组倍率配置
+// GET /api/v1/groups/rates
+func (h *APIKeyHandler) GetUserGroupRates(c *gin.Context) {
+	subject, ok := middleware2.GetAuthSubjectFromContext(c)
+	if !ok {
+		response.Unauthorized(c, "User not authenticated")
+		return
+	}
+
+	rates, err := h.apiKeyService.GetUserGroupRates(c.Request.Context(), subject.UserID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, rates)
+}

backend/internal/handler/dto/mappers.go

@@ -58,8 +58,9 @@ func UserFromServiceAdmin(u *service.User) *AdminUser {
 		return nil
 	}
 	return &AdminUser{
-		User:  *base,
+		User:       *base,
-		Notes: u.Notes,
+		Notes:      u.Notes,
+		GroupRates: u.GroupRates,
 	}
 }
 

backend/internal/handler/dto/types.go

@@ -29,6 +29,9 @@ type AdminUser struct {
 	User
 
 	Notes string `json:"notes"`
+	// GroupRates 用户专属分组倍率配置
+	// map[groupID]rateMultiplier
+	GroupRates map[int64]float64 `json:"group_rates,omitempty"`
 }
 
 type APIKey struct {

backend/internal/repository/user_group_rate_repo.go

@@ -0,0 +1,113 @@
+package repository
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+type userGroupRateRepository struct {
+	sql sqlExecutor
+}
+
+// NewUserGroupRateRepository 创建用户专属分组倍率仓储
+func NewUserGroupRateRepository(sqlDB *sql.DB) service.UserGroupRateRepository {
+	return &userGroupRateRepository{sql: sqlDB}
+}
+
+// GetByUserID 获取用户的所有专属分组倍率
+func (r *userGroupRateRepository) GetByUserID(ctx context.Context, userID int64) (map[int64]float64, error) {
+	query := `SELECT group_id, rate_multiplier FROM user_group_rate_multipliers WHERE user_id = $1`
+	rows, err := r.sql.QueryContext(ctx, query, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+
+	result := make(map[int64]float64)
+	for rows.Next() {
+		var groupID int64
+		var rate float64
+		if err := rows.Scan(&groupID, &rate); err != nil {
+			return nil, err
+		}
+		result[groupID] = rate
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return result, nil
+}
+
+// GetByUserAndGroup 获取用户在特定分组的专属倍率
+func (r *userGroupRateRepository) GetByUserAndGroup(ctx context.Context, userID, groupID int64) (*float64, error) {
+	query := `SELECT rate_multiplier FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = $2`
+	var rate float64
+	err := scanSingleRow(ctx, r.sql, query, []any{userID, groupID}, &rate)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &rate, nil
+}
+
+// SyncUserGroupRates 同步用户的分组专属倍率
+func (r *userGroupRateRepository) SyncUserGroupRates(ctx context.Context, userID int64, rates map[int64]*float64) error {
+	if len(rates) == 0 {
+		// 如果传入空 map，删除该用户的所有专属倍率
+		_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE user_id = $1`, userID)
+		return err
+	}
+
+	// 分离需要删除和需要 upsert 的记录
+	var toDelete []int64
+	toUpsert := make(map[int64]float64)
+	for groupID, rate := range rates {
+		if rate == nil {
+			toDelete = append(toDelete, groupID)
+		} else {
+			toUpsert[groupID] = *rate
+		}
+	}
+
+	// 删除指定的记录
+	for _, groupID := range toDelete {
+		_, err := r.sql.ExecContext(ctx,
+			`DELETE FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = $2`,
+			userID, groupID)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Upsert 记录
+	now := time.Now()
+	for groupID, rate := range toUpsert {
+		_, err := r.sql.ExecContext(ctx, `
+			INSERT INTO user_group_rate_multipliers (user_id, group_id, rate_multiplier, created_at, updated_at)
+			VALUES ($1, $2, $3, $4, $4)
+			ON CONFLICT (user_id, group_id) DO UPDATE SET rate_multiplier = $3, updated_at = $4
+		`, userID, groupID, rate, now)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// DeleteByGroupID 删除指定分组的所有用户专属倍率
+func (r *userGroupRateRepository) DeleteByGroupID(ctx context.Context, groupID int64) error {
+	_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE group_id = $1`, groupID)
+	return err
+}
+
+// DeleteByUserID 删除指定用户的所有专属倍率
+func (r *userGroupRateRepository) DeleteByUserID(ctx context.Context, userID int64) error {
+	_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE user_id = $1`, userID)
+	return err
+}

backend/internal/repository/wire.go

@@ -66,6 +66,7 @@ var ProviderSet = wire.NewSet(
 	NewUserSubscriptionRepository,
 	NewUserAttributeDefinitionRepository,
 	NewUserAttributeValueRepository,
+	NewUserGroupRateRepository,
 
 	// Cache implementations
 	NewGatewayCache,

backend/internal/server/api_contract_test.go

@@ -593,7 +593,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	}
 
 	userService := service.NewUserService(userRepo, nil)
-	apiKeyService := service.NewAPIKeyService(apiKeyRepo, userRepo, groupRepo, userSubRepo, apiKeyCache, cfg)
+	apiKeyService := service.NewAPIKeyService(apiKeyRepo, userRepo, groupRepo, userSubRepo, nil, apiKeyCache, cfg)
 
 	usageRepo := newStubUsageLogRepo()
 	usageService := service.NewUsageService(usageRepo, userRepo, nil, nil)
@@ -607,7 +607,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingRepo := newStubSettingRepo()
 	settingService := service.NewSettingService(settingRepo, cfg)
 
-	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil)
+	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil)
 	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil, redeemService, nil)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageHandler := handler.NewUsageHandler(usageService, apiKeyService)

backend/internal/server/middleware/api_key_auth_google_test.go

@@ -93,6 +93,7 @@ func newTestAPIKeyService(repo service.APIKeyRepository) *service.APIKeyService
 		nil, // userRepo (unused in GetByKey)
 		nil, // groupRepo
 		nil, // userSubRepo
+		nil, // userGroupRateRepo
 		nil, // cache
 		&config.Config{},
 	)
@@ -187,6 +188,7 @@ func TestApiKeyAuthWithSubscriptionGoogleSetsGroupContext(t *testing.T) {
 		nil,
 		nil,
 		nil,
+		nil,
 		&config.Config{RunMode: config.RunModeSimple},
 	)
 

backend/internal/server/middleware/api_key_auth_test.go

@@ -59,7 +59,7 @@ func TestSimpleModeBypassesQuotaCheck(t *testing.T) {
 
 	t.Run("simple_mode_bypasses_quota_check", func(t *testing.T) {
 		cfg := &config.Config{RunMode: config.RunModeSimple}
-		apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, cfg)
+		apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, nil, cfg)
 		subscriptionService := service.NewSubscriptionService(nil, &stubUserSubscriptionRepo{}, nil)
 		router := newAuthTestRouter(apiKeyService, subscriptionService, cfg)
 
@@ -73,7 +73,7 @@ func TestSimpleModeBypassesQuotaCheck(t *testing.T) {
 
 	t.Run("standard_mode_enforces_quota_check", func(t *testing.T) {
 		cfg := &config.Config{RunMode: config.RunModeStandard}
-		apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, cfg)
+		apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, nil, cfg)
 
 		now := time.Now()
 		sub := &service.UserSubscription{
@@ -150,7 +150,7 @@ func TestAPIKeyAuthSetsGroupContext(t *testing.T) {
 	}
 
 	cfg := &config.Config{RunMode: config.RunModeSimple}
-	apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, cfg)
+	apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, nil, cfg)
 	router := gin.New()
 	router.Use(gin.HandlerFunc(NewAPIKeyAuthMiddleware(apiKeyService, nil, cfg)))
 	router.GET("/t", func(c *gin.Context) {
@@ -208,7 +208,7 @@ func TestAPIKeyAuthOverwritesInvalidContextGroup(t *testing.T) {
 	}
 
 	cfg := &config.Config{RunMode: config.RunModeSimple}
-	apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, cfg)
+	apiKeyService := service.NewAPIKeyService(apiKeyRepo, nil, nil, nil, nil, nil, cfg)
 	router := gin.New()
 	router.Use(gin.HandlerFunc(NewAPIKeyAuthMiddleware(apiKeyService, nil, cfg)))
 

backend/internal/server/routes/user.go

@@ -49,6 +49,7 @@ func RegisterUserRoutes(
 		groups := authenticated.Group("/groups")
 		{
 			groups.GET("/available", h.APIKey.GetAvailableGroups)
+			groups.GET("/rates", h.APIKey.GetUserGroupRates)
 		}
 
 		// 使用记录

backend/internal/service/admin_service.go

@@ -93,6 +93,9 @@ type UpdateUserInput struct {
 	Concurrency   *int     // 使用指针区分"未提供"和"设置为0"
 	Status        string
 	AllowedGroups *[]int64 // 使用指针区分"未提供"和"设置为空数组"
+	// GroupRates 用户专属分组倍率配置
+	// map[groupID]*rate，nil 表示删除该分组的专属倍率
+	GroupRates map[int64]*float64
 }
 
 type CreateGroupInput struct {
@@ -293,6 +296,7 @@ type adminServiceImpl struct {
 	proxyRepo            ProxyRepository
 	apiKeyRepo           APIKeyRepository
 	redeemCodeRepo       RedeemCodeRepository
+	userGroupRateRepo    UserGroupRateRepository
 	billingCacheService  *BillingCacheService
 	proxyProber          ProxyExitInfoProber
 	proxyLatencyCache    ProxyLatencyCache
@@ -307,6 +311,7 @@ func NewAdminService(
 	proxyRepo ProxyRepository,
 	apiKeyRepo APIKeyRepository,
 	redeemCodeRepo RedeemCodeRepository,
+	userGroupRateRepo UserGroupRateRepository,
 	billingCacheService *BillingCacheService,
 	proxyProber ProxyExitInfoProber,
 	proxyLatencyCache ProxyLatencyCache,
@@ -319,6 +324,7 @@ func NewAdminService(
 		proxyRepo:            proxyRepo,
 		apiKeyRepo:           apiKeyRepo,
 		redeemCodeRepo:       redeemCodeRepo,
+		userGroupRateRepo:    userGroupRateRepo,
 		billingCacheService:  billingCacheService,
 		proxyProber:          proxyProber,
 		proxyLatencyCache:    proxyLatencyCache,
@@ -333,11 +339,35 @@ func (s *adminServiceImpl) ListUsers(ctx context.Context, page, pageSize int, fi
 	if err != nil {
 		return nil, 0, err
 	}
+	// 批量加载用户专属分组倍率
+	if s.userGroupRateRepo != nil && len(users) > 0 {
+		for i := range users {
+			rates, err := s.userGroupRateRepo.GetByUserID(ctx, users[i].ID)
+			if err != nil {
+				log.Printf("failed to load user group rates: user_id=%d err=%v", users[i].ID, err)
+				continue
+			}
+			users[i].GroupRates = rates
+		}
+	}
 	return users, result.Total, nil
 }
 
 func (s *adminServiceImpl) GetUser(ctx context.Context, id int64) (*User, error) {
-	return s.userRepo.GetByID(ctx, id)
+	user, err := s.userRepo.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	// 加载用户专属分组倍率
+	if s.userGroupRateRepo != nil {
+		rates, err := s.userGroupRateRepo.GetByUserID(ctx, id)
+		if err != nil {
+			log.Printf("failed to load user group rates: user_id=%d err=%v", id, err)
+		} else {
+			user.GroupRates = rates
+		}
+	}
+	return user, nil
 }
 
 func (s *adminServiceImpl) CreateUser(ctx context.Context, input *CreateUserInput) (*User, error) {
@@ -406,6 +436,14 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda
 	if err := s.userRepo.Update(ctx, user); err != nil {
 		return nil, err
 	}
+
+	// 同步用户专属分组倍率
+	if input.GroupRates != nil && s.userGroupRateRepo != nil {
+		if err := s.userGroupRateRepo.SyncUserGroupRates(ctx, user.ID, input.GroupRates); err != nil {
+			log.Printf("failed to sync user group rates: user_id=%d err=%v", user.ID, err)
+		}
+	}
+
 	if s.authCacheInvalidator != nil {
 		if user.Concurrency != oldConcurrency || user.Status != oldStatus || user.Role != oldRole {
 			s.authCacheInvalidator.InvalidateAuthCacheByUserID(ctx, user.ID)
@@ -941,6 +979,7 @@ func (s *adminServiceImpl) DeleteGroup(ctx context.Context, id int64) error {
 	if err != nil {
 		return err
 	}
+	// 注意：user_group_rate_multipliers 表通过外键 ON DELETE CASCADE 自动清理
 
 	// 事务成功后，异步失效受影响用户的订阅缓存
 	if len(affectedUserIDs) > 0 && s.billingCacheService != nil {

backend/internal/service/api_key_service.go

@@ -115,15 +115,16 @@ type UpdateAPIKeyRequest struct {
 
 // APIKeyService API Key服务
 type APIKeyService struct {
-	apiKeyRepo  APIKeyRepository
+	apiKeyRepo        APIKeyRepository
-	userRepo    UserRepository
+	userRepo          UserRepository
-	groupRepo   GroupRepository
+	groupRepo         GroupRepository
-	userSubRepo UserSubscriptionRepository
+	userSubRepo       UserSubscriptionRepository
-	cache       APIKeyCache
+	userGroupRateRepo UserGroupRateRepository
-	cfg         *config.Config
+	cache             APIKeyCache
-	authCacheL1 *ristretto.Cache
+	cfg               *config.Config
-	authCfg     apiKeyAuthCacheConfig
+	authCacheL1       *ristretto.Cache
-	authGroup   singleflight.Group
+	authCfg           apiKeyAuthCacheConfig
+	authGroup         singleflight.Group
 }
 
 // NewAPIKeyService 创建API Key服务实例
@@ -132,16 +133,18 @@ func NewAPIKeyService(
 	userRepo UserRepository,
 	groupRepo GroupRepository,
 	userSubRepo UserSubscriptionRepository,
+	userGroupRateRepo UserGroupRateRepository,
 	cache APIKeyCache,
 	cfg *config.Config,
 ) *APIKeyService {
 	svc := &APIKeyService{
-		apiKeyRepo:  apiKeyRepo,
+		apiKeyRepo:        apiKeyRepo,
-		userRepo:    userRepo,
+		userRepo:          userRepo,
-		groupRepo:   groupRepo,
+		groupRepo:         groupRepo,
-		userSubRepo: userSubRepo,
+		userSubRepo:       userSubRepo,
-		cache:       cache,
+		userGroupRateRepo: userGroupRateRepo,
-		cfg:         cfg,
+		cache:             cache,
+		cfg:               cfg,
 	}
 	svc.initAuthCache(cfg)
 	return svc
@@ -627,6 +630,19 @@ func (s *APIKeyService) SearchAPIKeys(ctx context.Context, userID int64, keyword
 	return keys, nil
 }
 
+// GetUserGroupRates 获取用户的专属分组倍率配置
+// 返回 map[groupID]rateMultiplier
+func (s *APIKeyService) GetUserGroupRates(ctx context.Context, userID int64) (map[int64]float64, error) {
+	if s.userGroupRateRepo == nil {
+		return nil, nil
+	}
+	rates, err := s.userGroupRateRepo.GetByUserID(ctx, userID)
+	if err != nil {
+		return nil, fmt.Errorf("get user group rates: %w", err)
+	}
+	return rates, nil
+}
+
 // CheckAPIKeyQuotaAndExpiry checks if the API key is valid for use (not expired, quota not exhausted)
 // Returns nil if valid, error if invalid
 func (s *APIKeyService) CheckAPIKeyQuotaAndExpiry(apiKey *APIKey) error {

backend/internal/service/api_key_service_cache_test.go

@@ -167,7 +167,7 @@ func TestAPIKeyService_GetByKey_UsesL2Cache(t *testing.T) {
 			NegativeTTLSeconds: 30,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 
 	groupID := int64(9)
 	cacheEntry := &APIKeyAuthCacheEntry{
@@ -223,7 +223,7 @@ func TestAPIKeyService_GetByKey_NegativeCache(t *testing.T) {
 			NegativeTTLSeconds: 30,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
 		return &APIKeyAuthCacheEntry{NotFound: true}, nil
 	}
@@ -256,7 +256,7 @@ func TestAPIKeyService_GetByKey_CacheMissStoresL2(t *testing.T) {
 			NegativeTTLSeconds: 30,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
 		return nil, redis.Nil
 	}
@@ -293,7 +293,7 @@ func TestAPIKeyService_GetByKey_UsesL1Cache(t *testing.T) {
 			L1TTLSeconds: 60,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 	require.NotNil(t, svc.authCacheL1)
 
 	_, err := svc.GetByKey(context.Background(), "k-l1")
@@ -320,7 +320,7 @@ func TestAPIKeyService_InvalidateAuthCacheByUserID(t *testing.T) {
 			NegativeTTLSeconds: 30,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 
 	svc.InvalidateAuthCacheByUserID(context.Background(), 7)
 	require.Len(t, cache.deleteAuthKeys, 2)
@@ -338,7 +338,7 @@ func TestAPIKeyService_InvalidateAuthCacheByGroupID(t *testing.T) {
 			L2TTLSeconds: 60,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 
 	svc.InvalidateAuthCacheByGroupID(context.Background(), 9)
 	require.Len(t, cache.deleteAuthKeys, 2)
@@ -356,7 +356,7 @@ func TestAPIKeyService_InvalidateAuthCacheByKey(t *testing.T) {
 			L2TTLSeconds: 60,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 
 	svc.InvalidateAuthCacheByKey(context.Background(), "k1")
 	require.Len(t, cache.deleteAuthKeys, 1)
@@ -375,7 +375,7 @@ func TestAPIKeyService_GetByKey_CachesNegativeOnRepoMiss(t *testing.T) {
 			NegativeTTLSeconds: 30,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 	cache.getAuthCache = func(ctx context.Context, key string) (*APIKeyAuthCacheEntry, error) {
 		return nil, redis.Nil
 	}
@@ -411,7 +411,7 @@ func TestAPIKeyService_GetByKey_SingleflightCollapses(t *testing.T) {
 			Singleflight: true,
 		},
 	}
-	svc := NewAPIKeyService(repo, nil, nil, nil, cache, cfg)
+	svc := NewAPIKeyService(repo, nil, nil, nil, nil, cache, cfg)
 
 	start := make(chan struct{})
 	wg := sync.WaitGroup{}

backend/internal/service/gateway_service.go

@@ -384,6 +384,7 @@ type GatewayService struct {
 	usageLogRepo        UsageLogRepository
 	userRepo            UserRepository
 	userSubRepo         UserSubscriptionRepository
+	userGroupRateRepo   UserGroupRateRepository
 	cache               GatewayCache
 	cfg                 *config.Config
 	schedulerSnapshot   *SchedulerSnapshotService
@@ -405,6 +406,7 @@ func NewGatewayService(
 	usageLogRepo UsageLogRepository,
 	userRepo UserRepository,
 	userSubRepo UserSubscriptionRepository,
+	userGroupRateRepo UserGroupRateRepository,
 	cache GatewayCache,
 	cfg *config.Config,
 	schedulerSnapshot *SchedulerSnapshotService,
@@ -424,6 +426,7 @@ func NewGatewayService(
 		usageLogRepo:        usageLogRepo,
 		userRepo:            userRepo,
 		userSubRepo:         userSubRepo,
+		userGroupRateRepo:   userGroupRateRepo,
 		cache:               cache,
 		cfg:                 cfg,
 		schedulerSnapshot:   schedulerSnapshot,
@@ -4609,10 +4612,17 @@ func (s *GatewayService) RecordUsage(ctx context.Context, input *RecordUsageInpu
 	account := input.Account
 	subscription := input.Subscription
 
-	// 获取费率倍数
+	// 获取费率倍数（优先级：用户专属 > 分组默认 > 系统默认）
 	multiplier := s.cfg.Default.RateMultiplier
 	if apiKey.GroupID != nil && apiKey.Group != nil {
 		multiplier = apiKey.Group.RateMultiplier
+
+		// 检查用户专属倍率
+		if s.userGroupRateRepo != nil {
+			if userRate, err := s.userGroupRateRepo.GetByUserAndGroup(ctx, user.ID, *apiKey.GroupID); err == nil && userRate != nil {
+				multiplier = *userRate
+			}
+		}
 	}
 
 	var cost *CostBreakdown
@@ -4773,10 +4783,17 @@ func (s *GatewayService) RecordUsageWithLongContext(ctx context.Context, input *
 	account := input.Account
 	subscription := input.Subscription
 
-	// 获取费率倍数
+	// 获取费率倍数（优先级：用户专属 > 分组默认 > 系统默认）
 	multiplier := s.cfg.Default.RateMultiplier
 	if apiKey.GroupID != nil && apiKey.Group != nil {
 		multiplier = apiKey.Group.RateMultiplier
+
+		// 检查用户专属倍率
+		if s.userGroupRateRepo != nil {
+			if userRate, err := s.userGroupRateRepo.GetByUserAndGroup(ctx, user.ID, *apiKey.GroupID); err == nil && userRate != nil {
+				multiplier = *userRate
+			}
+		}
 	}
 
 	var cost *CostBreakdown

backend/internal/service/user.go

@@ -21,6 +21,10 @@ type User struct {
 	CreatedAt     time.Time
 	UpdatedAt     time.Time
 
+	// GroupRates 用户专属分组倍率配置
+	// map[groupID]rateMultiplier
+	GroupRates map[int64]float64
+
 	// TOTP 双因素认证字段
 	TotpSecretEncrypted *string    // AES-256-GCM 加密的 TOTP 密钥
 	TotpEnabled         bool       // 是否启用 TOTP
@@ -40,18 +44,20 @@ func (u *User) IsActive() bool {
 
 // 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.
+// - Public groups (non-exclusive): all users can bind
-// - If AllowedGroups is empty (nil or length 0), allow binding to any non-exclusive group.
+// - Exclusive groups: only users with the group in AllowedGroups can bind
 func (u *User) CanBindGroup(groupID int64, isExclusive bool) bool {
-	if len(u.AllowedGroups) > 0 {
+	// 公开分组（非专属）：所有用户都可以绑定
-		for _, id := range u.AllowedGroups {
+	if !isExclusive {
-			if id == groupID {
+		return true
-				return true
-			}
-		}
-		return false
 	}
-	return !isExclusive
+	// 专属分组：需要在 AllowedGroups 中
+	for _, id := range u.AllowedGroups {
+		if id == groupID {
+			return true
+		}
+	}
+	return false
 }
 
 func (u *User) SetPassword(password string) error {

backend/internal/service/user_group_rate.go

@@ -0,0 +1,25 @@
+package service
+
+import "context"
+
+// UserGroupRateRepository 用户专属分组倍率仓储接口
+// 允许管理员为特定用户设置分组的专属计费倍率，覆盖分组默认倍率
+type UserGroupRateRepository interface {
+	// GetByUserID 获取用户的所有专属分组倍率
+	// 返回 map[groupID]rateMultiplier
+	GetByUserID(ctx context.Context, userID int64) (map[int64]float64, error)
+
+	// GetByUserAndGroup 获取用户在特定分组的专属倍率
+	// 如果未设置专属倍率，返回 nil
+	GetByUserAndGroup(ctx context.Context, userID, groupID int64) (*float64, error)
+
+	// SyncUserGroupRates 同步用户的分组专属倍率
+	// rates: map[groupID]*rateMultiplier，nil 表示删除该分组的专属倍率
+	SyncUserGroupRates(ctx context.Context, userID int64, rates map[int64]*float64) error
+
+	// DeleteByGroupID 删除指定分组的所有用户专属倍率（分组删除时调用）
+	DeleteByGroupID(ctx context.Context, groupID int64) error
+
+	// DeleteByUserID 删除指定用户的所有专属倍率（用户删除时调用）
+	DeleteByUserID(ctx context.Context, userID int64) error
+}

backend/migrations/047_add_user_group_rate_multipliers.sql

@@ -0,0 +1,19 @@
+-- 用户专属分组倍率表
+-- 允许管理员为特定用户设置分组的专属计费倍率，覆盖分组默认倍率
+CREATE TABLE IF NOT EXISTS user_group_rate_multipliers (
+    user_id         BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    group_id        BIGINT NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+    rate_multiplier DECIMAL(10,4) NOT NULL,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (user_id, group_id)
+);
+
+-- 按 group_id 查询索引（删除分组时清理关联记录）
+CREATE INDEX IF NOT EXISTS idx_user_group_rate_multipliers_group_id
+    ON user_group_rate_multipliers(group_id);
+
+COMMENT ON TABLE user_group_rate_multipliers IS '用户专属分组倍率配置';
+COMMENT ON COLUMN user_group_rate_multipliers.user_id IS '用户ID';
+COMMENT ON COLUMN user_group_rate_multipliers.group_id IS '分组ID';
+COMMENT ON COLUMN user_group_rate_multipliers.rate_multiplier IS '专属计费倍率（覆盖分组默认倍率）';

frontend/src/api/groups.ts

@@ -18,8 +18,18 @@ export async function getAvailable(): Promise<Group[]> {
   return data
 }
 
+/**
+ * Get current user's custom group rate multipliers
+ * @returns Map of group_id to custom rate_multiplier
+ */
+export async function getUserGroupRates(): Promise<Record<number, number>> {
+  const { data } = await apiClient.get<Record<number, number> | null>('/groups/rates')
+  return data || {}
+}
+
 export const userGroupsAPI = {
-  getAvailable
+  getAvailable,
+  getUserGroupRates
 }
 
 export default userGroupsAPI

frontend/src/components/admin/user/UserAllowedGroupsModal.vue

@@ -1,59 +1,328 @@
 <template>
-  <BaseDialog :show="show" :title="t('admin.users.setAllowedGroups')" width="normal" @close="$emit('close')">
+  <BaseDialog :show="show" :title="t('admin.users.groupConfig')" width="wide" @close="$emit('close')">
-    <div v-if="user" class="space-y-4">
+    <div v-if="user" class="space-y-6">
-      <div class="flex items-center gap-3 rounded-xl bg-gray-50 p-4 dark:bg-dark-700">
+      <!-- 用户信息头部 -->
-        <div class="flex h-10 w-10 items-center justify-center rounded-full bg-primary-100">
+      <div class="flex items-center gap-4 rounded-2xl bg-gradient-to-r from-primary-50 to-primary-100 p-5 dark:from-primary-900/30 dark:to-primary-800/20">
-          <span class="text-lg font-medium text-primary-700">{{ user.email.charAt(0).toUpperCase() }}</span>
+        <div class="flex h-14 w-14 items-center justify-center rounded-full bg-white shadow-sm dark:bg-dark-700">
+          <span class="text-2xl font-semibold text-primary-600 dark:text-primary-400">{{ user.email.charAt(0).toUpperCase() }}</span>
+        </div>
+        <div class="flex-1">
+          <p class="text-lg font-semibold text-gray-900 dark:text-white">{{ user.email }}</p>
+          <p class="mt-1 text-sm text-gray-600 dark:text-gray-400">{{ t('admin.users.groupConfigHint', { email: user.email }) }}</p>
         </div>
-        <p class="font-medium text-gray-900 dark:text-white">{{ user.email }}</p>
       </div>
-      <div v-if="loading" class="flex justify-center py-8"><svg class="h-8 w-8 animate-spin text-primary-500" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path></svg></div>
+
-      <div v-else>
+      <!-- 加载状态 -->
-        <p class="mb-3 text-sm text-gray-600">{{ t('admin.users.allowedGroupsHint') }}</p>
+      <div v-if="loading" class="flex justify-center py-12">
-        <div class="max-h-64 space-y-2 overflow-y-auto">
+        <svg class="h-10 w-10 animate-spin text-primary-500" fill="none" viewBox="0 0 24 24">
-          <label v-for="group in groups" :key="group.id" class="flex cursor-pointer items-center gap-3 rounded-lg border border-gray-200 p-3 hover:bg-gray-50" :class="{'border-primary-300 bg-primary-50': selectedIds.includes(group.id)}">
+          <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
-            <input type="checkbox" :value="group.id" v-model="selectedIds" class="h-4 w-4 rounded border-gray-300 text-primary-600" />
+          <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
-            <div class="flex-1"><p class="font-medium text-gray-900">{{ group.name }}</p><p v-if="group.description" class="truncate text-sm text-gray-500">{{ group.description }}</p></div>
+        </svg>
-            <div class="flex items-center gap-2"><span class="badge badge-gray text-xs">{{ group.platform }}</span><span v-if="group.is_exclusive" class="badge badge-purple text-xs">{{ t('admin.groups.exclusive') }}</span></div>
+      </div>
-          </label>
+
+      <div v-else class="space-y-6">
+        <!-- 专属分组区域 -->
+        <div v-if="exclusiveGroups.length > 0">
+          <div class="mb-3 flex items-center gap-2">
+            <div class="h-1.5 w-1.5 rounded-full bg-purple-500"></div>
+            <h4 class="text-sm font-semibold text-gray-700 dark:text-gray-300">{{ t('admin.users.exclusiveGroups') }}</h4>
+            <span class="text-xs text-gray-400">({{ exclusiveGroupConfigs.filter(c => c.isSelected).length }}/{{ exclusiveGroupConfigs.length }})</span>
+          </div>
+          <div class="grid gap-3">
+            <div
+              v-for="config in exclusiveGroupConfigs"
+              :key="config.groupId"
+              class="group relative overflow-hidden rounded-xl border-2 p-4 transition-all duration-200"
+              :class="config.isSelected
+                ? 'border-primary-400 bg-primary-50/50 shadow-sm dark:border-primary-500 dark:bg-primary-900/20'
+                : 'border-gray-200 bg-white hover:border-gray-300 dark:border-dark-600 dark:bg-dark-800 dark:hover:border-dark-500'"
+            >
+              <div class="flex items-center gap-4">
+                <!-- 复选框 -->
+                <div class="flex-shrink-0">
+                  <label class="relative flex h-6 w-6 cursor-pointer items-center justify-center">
+                    <input
+                      type="checkbox"
+                      :checked="config.isSelected"
+                      @change="toggleExclusiveGroup(config.groupId)"
+                      class="peer sr-only"
+                    />
+                    <div class="h-5 w-5 rounded-md border-2 border-gray-300 transition-all peer-checked:border-primary-500 peer-checked:bg-primary-500 dark:border-dark-500 peer-checked:dark:border-primary-500">
+                      <svg v-if="config.isSelected" class="h-full w-full text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="3">
+                        <path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
+                      </svg>
+                    </div>
+                  </label>
+                </div>
+
+                <!-- 分组信息 -->
+                <div class="min-w-0 flex-1">
+                  <div class="flex items-center gap-2">
+                    <span class="text-base font-semibold text-gray-900 dark:text-white">{{ config.groupName }}</span>
+                    <span class="inline-flex items-center rounded-full bg-purple-100 px-2 py-0.5 text-xs font-medium text-purple-700 dark:bg-purple-900/40 dark:text-purple-300">
+                      {{ t('admin.groups.exclusive') }}
+                    </span>
+                  </div>
+                  <div class="mt-1.5 flex items-center gap-3 text-sm">
+                    <span class="inline-flex items-center gap-1 text-gray-500 dark:text-gray-400">
+                      <PlatformIcon :platform="config.platform" size="xs" />
+                      <span>{{ config.platform }}</span>
+                    </span>
+                    <span class="text-gray-300 dark:text-dark-500">•</span>
+                    <span class="text-gray-500 dark:text-gray-400">
+                      {{ t('admin.users.defaultRate') }}: <span class="font-medium text-gray-700 dark:text-gray-300">{{ config.defaultRate }}x</span>
+                    </span>
+                  </div>
+                </div>
+
+                <!-- 专属倍率输入 -->
+                <div class="flex flex-shrink-0 items-center gap-3">
+                  <label class="text-sm font-medium text-gray-600 dark:text-gray-400">{{ t('admin.users.customRate') }}</label>
+                  <input
+                    type="number"
+                    step="0.001"
+                    min="0"
+                    :value="config.customRate ?? ''"
+                    @input="updateCustomRate(config.groupId, ($event.target as HTMLInputElement).value)"
+                    :placeholder="String(config.defaultRate)"
+                    class="hide-spinner w-24 rounded-lg border border-gray-300 bg-white px-3 py-2 text-sm font-medium transition-colors focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-primary-500/20 dark:border-dark-500 dark:bg-dark-700 dark:focus:border-primary-500"
+                  />
+                </div>
+              </div>
+            </div>
+          </div>
         </div>
-        <div class="mt-4 border-t border-gray-200 pt-4">
+
-          <label class="flex cursor-pointer items-center gap-3 rounded-lg border border-gray-200 p-3 hover:bg-gray-50" :class="{'border-green-300 bg-green-50': selectedIds.length === 0}">
+        <!-- 公开分组区域 -->
-            <input type="radio" :checked="selectedIds.length === 0" @change="selectedIds = []" class="h-4 w-4 border-gray-300 text-green-600" />
+        <div v-if="publicGroups.length > 0">
-            <div class="flex-1"><p class="font-medium text-gray-900">{{ t('admin.users.allowAllGroups') }}</p><p class="text-sm text-gray-500">{{ t('admin.users.allowAllGroupsHint') }}</p></div>
+          <div class="mb-3 flex items-center gap-2">
-          </label>
+            <div class="h-1.5 w-1.5 rounded-full bg-green-500"></div>
+            <h4 class="text-sm font-semibold text-gray-700 dark:text-gray-300">{{ t('admin.users.publicGroups') }}</h4>
+            <span class="text-xs text-gray-400">({{ publicGroupConfigs.length }})</span>
+          </div>
+          <div class="grid gap-3">
+            <div
+              v-for="config in publicGroupConfigs"
+              :key="config.groupId"
+              class="relative overflow-hidden rounded-xl border-2 border-green-200 bg-green-50/50 p-4 dark:border-green-800/50 dark:bg-green-900/10"
+            >
+              <div class="flex items-center gap-4">
+                <!-- 复选框（禁用状态） -->
+                <div class="flex-shrink-0">
+                  <div class="flex h-5 w-5 items-center justify-center rounded-md border-2 border-green-400 bg-green-500 dark:border-green-600 dark:bg-green-600">
+                    <svg class="h-full w-full text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="3">
+                      <path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
+                    </svg>
+                  </div>
+                </div>
+
+                <!-- 分组信息 -->
+                <div class="min-w-0 flex-1">
+                  <div class="flex items-center gap-2">
+                    <span class="text-base font-semibold text-gray-900 dark:text-white">{{ config.groupName }}</span>
+                  </div>
+                  <div class="mt-1.5 flex items-center gap-3 text-sm">
+                    <span class="inline-flex items-center gap-1 text-gray-500 dark:text-gray-400">
+                      <PlatformIcon :platform="config.platform" size="xs" />
+                      <span>{{ config.platform }}</span>
+                    </span>
+                    <span class="text-gray-300 dark:text-dark-500">•</span>
+                    <span class="text-gray-500 dark:text-gray-400">
+                      {{ t('admin.users.defaultRate') }}: <span class="font-medium text-gray-700 dark:text-gray-300">{{ config.defaultRate }}x</span>
+                    </span>
+                  </div>
+                </div>
+
+                <!-- 专属倍率输入 -->
+                <div class="flex flex-shrink-0 items-center gap-3">
+                  <label class="text-sm font-medium text-gray-600 dark:text-gray-400">{{ t('admin.users.customRate') }}</label>
+                  <input
+                    type="number"
+                    step="0.001"
+                    min="0"
+                    :value="config.customRate ?? ''"
+                    @input="updateCustomRate(config.groupId, ($event.target as HTMLInputElement).value)"
+                    :placeholder="String(config.defaultRate)"
+                    class="hide-spinner w-24 rounded-lg border border-gray-300 bg-white px-3 py-2 text-sm font-medium transition-colors focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-primary-500/20 dark:border-dark-500 dark:bg-dark-700 dark:focus:border-primary-500"
+                  />
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <!-- 无分组提示 -->
+        <div v-if="groups.length === 0" class="flex flex-col items-center justify-center py-12 text-center">
+          <div class="mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-gray-100 dark:bg-dark-700">
+            <svg class="h-8 w-8 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
+            </svg>
+          </div>
+          <p class="text-gray-500 dark:text-gray-400">{{ t('common.noGroupsAvailable') }}</p>
         </div>
       </div>
     </div>
+
     <template #footer>
       <div class="flex justify-end gap-3">
-        <button @click="$emit('close')" class="btn btn-secondary">{{ t('common.cancel') }}</button>
+        <button @click="$emit('close')" class="btn btn-secondary px-5">{{ t('common.cancel') }}</button>
-        <button @click="handleSave" :disabled="submitting" class="btn btn-primary">{{ submitting ? t('common.saving') : t('common.save') }}</button>
+        <button @click="handleSave" :disabled="submitting" class="btn btn-primary px-6">
+          <svg v-if="submitting" class="-ml-1 mr-2 h-4 w-4 animate-spin" fill="none" viewBox="0 0 24 24">
+            <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+            <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+          </svg>
+          {{ submitting ? t('common.saving') : t('common.save') }}
+        </button>
       </div>
     </template>
   </BaseDialog>
 </template>
 
 <script setup lang="ts">
-import { ref, watch } from 'vue'
+import { ref, watch, computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { adminAPI } from '@/api/admin'
-import type { AdminUser, Group } from '@/types'
+import type { AdminUser, Group, GroupPlatform } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
+import PlatformIcon from '@/components/common/PlatformIcon.vue'
 
-const props = defineProps<{ show: boolean, user: AdminUser | null }>()
+interface GroupRateConfig {
-const emit = defineEmits(['close', 'success']); const { t } = useI18n(); const appStore = useAppStore()
+  groupId: number
+  groupName: string
+  platform: GroupPlatform
+  isExclusive: boolean
+  defaultRate: number
+  customRate: number | null
+  isSelected: boolean
+}
 
-const groups = ref<Group[]>([]); const selectedIds = ref<number[]>([]); const loading = ref(false); const submitting = ref(false)
+const props = defineProps<{ show: boolean; user: AdminUser | null }>()
+const emit = defineEmits(['close', 'success'])
+const { t } = useI18n()
+const appStore = useAppStore()
 
-watch(() => props.show, (v) => { if(v && props.user) { selectedIds.value = props.user.allowed_groups || []; load() } })
+const groups = ref<Group[]>([])
-const load = async () => { loading.value = true; try { const res = await adminAPI.groups.list(1, 1000); groups.value = res.items.filter(g => g.subscription_type === 'standard' && g.status === 'active') } catch (error) { console.error('Failed to load groups:', error) } finally { loading.value = false } }
+const groupConfigs = ref<GroupRateConfig[]>([])
-const handleSave = async () => {
+const originalGroupRates = ref<Record<number, number>>({}) // 记录原始专属倍率，用于检测删除
-  if (!props.user) return; submitting.value = true
+const loading = ref(false)
+const submitting = ref(false)
+
+// 分离专属分组和公开分组
+const exclusiveGroups = computed(() => groups.value.filter((g) => g.is_exclusive))
+const publicGroups = computed(() => groups.value.filter((g) => !g.is_exclusive))
+
+const exclusiveGroupConfigs = computed(() => groupConfigs.value.filter((c) => c.isExclusive))
+const publicGroupConfigs = computed(() => groupConfigs.value.filter((c) => !c.isExclusive))
+
+watch(
+  () => props.show,
+  (v) => {
+    if (v && props.user) {
+      load()
+    }
+  }
+)
+
+const load = async () => {
+  loading.value = true
   try {
-    await adminAPI.users.update(props.user.id, { allowed_groups: selectedIds.value })
+    const res = await adminAPI.groups.list(1, 1000)
-    appStore.showSuccess(t('admin.users.allowedGroupsUpdated')); emit('success'); emit('close')
+    // 只显示标准类型且活跃的分组
-  } catch (error) { console.error('Failed to update allowed groups:', error) } finally { submitting.value = false }
+    groups.value = res.items.filter((g) => g.subscription_type === 'standard' && g.status === 'active')
+
+    // 初始化配置
+    const userAllowedGroups = props.user?.allowed_groups || []
+    const userGroupRates = props.user?.group_rates || {}
+
+    // 保存原始专属倍率，用于检测删除操作
+    originalGroupRates.value = { ...userGroupRates }
+
+    groupConfigs.value = groups.value.map((g) => ({
+      groupId: g.id,
+      groupName: g.name,
+      platform: g.platform,
+      isExclusive: g.is_exclusive,
+      defaultRate: g.rate_multiplier,
+      customRate: userGroupRates[g.id] ?? null,
+      // 专属分组：检查是否在 allowed_groups 中
+      // 公开分组：始终选中
+      isSelected: g.is_exclusive ? userAllowedGroups.includes(g.id) : true,
+    }))
+  } catch (error) {
+    console.error('Failed to load groups:', error)
+  } finally {
+    loading.value = false
+  }
+}
+
+const toggleExclusiveGroup = (groupId: number) => {
+  const config = groupConfigs.value.find((c) => c.groupId === groupId)
+  if (config && config.isExclusive) {
+    config.isSelected = !config.isSelected
+  }
+}
+
+const updateCustomRate = (groupId: number, value: string) => {
+  const config = groupConfigs.value.find((c) => c.groupId === groupId)
+  if (config) {
+    if (value === '' || value === null || value === undefined) {
+      config.customRate = null
+    } else {
+      const numValue = parseFloat(value)
+      config.customRate = isNaN(numValue) ? null : numValue
+    }
+  }
+}
+
+const handleSave = async () => {
+  if (!props.user) return
+  submitting.value = true
+
+  try {
+    // 构建 allowed_groups（仅包含专属分组中被勾选的）
+    const allowedGroups = groupConfigs.value.filter((c) => c.isExclusive && c.isSelected).map((c) => c.groupId)
+
+    // 构建 group_rates
+    // - 有新专属倍率: 设置为该值
+    // - 原本有专属倍率但现在被清空: 设置为 null（表示删除）
+    const groupRates: Record<number, number | null> = {}
+    for (const c of groupConfigs.value) {
+      const hadOriginalRate = originalGroupRates.value[c.groupId] !== undefined
+
+      if (c.customRate !== null) {
+        // 有专属倍率
+        groupRates[c.groupId] = c.customRate
+      } else if (hadOriginalRate) {
+        // 原本有专属倍率，现在被清空，需要显式删除
+        groupRates[c.groupId] = null
+      }
+    }
+
+    await adminAPI.users.update(props.user.id, {
+      allowed_groups: allowedGroups,
+      group_rates: Object.keys(groupRates).length > 0 ? groupRates : undefined,
+    })
+
+    appStore.showSuccess(t('admin.users.groupConfigUpdated'))
+    emit('success')
+    emit('close')
+  } catch (error) {
+    console.error('Failed to update user group config:', error)
+  } finally {
+    submitting.value = false
+  }
 }
 </script>
+
+<style scoped>
+/* 隐藏数字输入框的箭头按钮 */
+.hide-spinner::-webkit-outer-spin-button,
+.hide-spinner::-webkit-inner-spin-button {
+  -webkit-appearance: none;
+  margin: 0;
+}
+.hide-spinner {
+  -moz-appearance: textfield;
+}
+</style>

frontend/src/components/common/GroupBadge.vue

@@ -11,7 +11,14 @@
     <span class="truncate">{{ name }}</span>
     <!-- Right side label -->
     <span v-if="showLabel" :class="labelClass">
-      {{ labelText }}
+      <template v-if="hasCustomRate">
+        <!-- 原倍率删除线 + 专属倍率高亮 -->
+        <span class="line-through opacity-50 mr-0.5">{{ rateMultiplier }}x</span>
+        <span class="font-bold">{{ userRateMultiplier }}x</span>
+      </template>
+      <template v-else>
+        {{ labelText }}
+      </template>
     </span>
   </span>
 </template>
@@ -27,6 +34,7 @@ interface Props {
   platform?: GroupPlatform
   subscriptionType?: SubscriptionType
   rateMultiplier?: number
+  userRateMultiplier?: number | null // 用户专属倍率
   showRate?: boolean
   daysRemaining?: number | null // 剩余天数（订阅类型时使用）
 }
@@ -34,20 +42,31 @@ interface Props {
 const props = withDefaults(defineProps<Props>(), {
   subscriptionType: 'standard',
   showRate: true,
-  daysRemaining: null
+  daysRemaining: null,
+  userRateMultiplier: null
 })
 
 const { t } = useI18n()
 
 const isSubscription = computed(() => props.subscriptionType === 'subscription')
 
+// 是否有专属倍率（且与默认倍率不同）
+const hasCustomRate = computed(() => {
+  return (
+    props.userRateMultiplier !== null &&
+    props.userRateMultiplier !== undefined &&
+    props.rateMultiplier !== undefined &&
+    props.userRateMultiplier !== props.rateMultiplier
+  )
+})
+
 // 是否显示右侧标签
 const showLabel = computed(() => {
   if (!props.showRate) return false
   // 订阅类型：显示天数或"订阅"
   if (isSubscription.value) return true
-  // 标准类型：显示倍率
+  // 标准类型：显示倍率（包括专属倍率）
-  return props.rateMultiplier !== undefined
+  return props.rateMultiplier !== undefined || hasCustomRate.value
 })
 
 // Label text
@@ -71,7 +90,7 @@ const labelClass = computed(() => {
   const base = 'px-1.5 py-0.5 rounded text-[10px] font-semibold'
 
   if (!isSubscription.value) {
-    // Standard: subtle background
+    // Standard: subtle background (不再为专属倍率使用不同的背景色)
     return `${base} bg-black/10 dark:bg-white/10`
   }
 

frontend/src/components/common/GroupOptionItem.vue

@@ -9,6 +9,7 @@
         :platform="platform"
         :subscription-type="subscriptionType"
         :rate-multiplier="rateMultiplier"
+        :user-rate-multiplier="userRateMultiplier"
       />
       <span
         v-if="description"
@@ -39,6 +40,7 @@ interface Props {
   platform: GroupPlatform
   subscriptionType?: SubscriptionType
   rateMultiplier?: number
+  userRateMultiplier?: number | null
   description?: string | null
   selected?: boolean
   showCheckmark?: boolean
@@ -47,6 +49,7 @@ interface Props {
 withDefaults(defineProps<Props>(), {
   subscriptionType: 'standard',
   selected: false,
-  showCheckmark: true
+  showCheckmark: true,
+  userRateMultiplier: null
 })
 </script>

frontend/src/i18n/locales/en.ts

@@ -849,6 +849,16 @@ export default {
       allowedGroupsUpdated: 'Allowed groups updated successfully',
       failedToLoadGroups: 'Failed to load groups',
       failedToUpdateAllowedGroups: 'Failed to update allowed groups',
+      // User Group Configuration
+      groupConfig: 'User Group Configuration',
+      groupConfigHint: 'Configure custom rate multipliers for user {email} (overrides group defaults)',
+      exclusiveGroups: 'Exclusive Groups',
+      publicGroups: 'Public Groups (Default Available)',
+      defaultRate: 'Default Rate',
+      customRate: 'Custom Rate',
+      useDefaultRate: 'Use Default',
+      customRatePlaceholder: 'Leave empty for default',
+      groupConfigUpdated: 'Group configuration updated successfully',
       deposit: 'Deposit',
       withdraw: 'Withdraw',
       depositAmount: 'Deposit Amount',

frontend/src/i18n/locales/zh.ts

@@ -910,6 +910,16 @@ export default {
       allowedGroupsUpdated: '允许分组更新成功',
       failedToLoadGroups: '加载分组列表失败',
       failedToUpdateAllowedGroups: '更新允许分组失败',
+      // 用户分组配置
+      groupConfig: '用户分组配置',
+      groupConfigHint: '为用户 {email} 配置专属分组倍率（覆盖分组默认倍率）',
+      exclusiveGroups: '专属分组',
+      publicGroups: '公开分组（默认可用）',
+      defaultRate: '默认倍率',
+      customRate: '专属倍率',
+      useDefaultRate: '使用默认',
+      customRatePlaceholder: '留空使用默认',
+      groupConfigUpdated: '分组配置更新成功',
       deposit: '充值',
       withdraw: '退款',
       depositAmount: '充值金额',

frontend/src/types/index.ts

@@ -41,6 +41,8 @@ export interface User {
 export interface AdminUser extends User {
   // 管理员备注（普通用户接口不返回）
   notes: string
+  // 用户专属分组倍率配置 (group_id -> rate_multiplier)
+  group_rates?: Record<number, number>
 }
 
 export interface LoginRequest {
@@ -966,6 +968,9 @@ export interface UpdateUserRequest {
   concurrency?: number
   status?: 'active' | 'disabled'
   allowed_groups?: number[] | null
+  // 用户专属分组倍率配置 (group_id -> rate_multiplier | null)
+  // null 表示删除该分组的专属倍率
+  group_rates?: Record<number, number | null>
 }
 
 export interface ChangePasswordRequest {

frontend/src/views/user/KeysView.vue

@@ -73,6 +73,7 @@
                   :platform="row.group.platform"
                   :subscription-type="row.group.subscription_type"
                   :rate-multiplier="row.group.rate_multiplier"
+                  :user-rate-multiplier="userGroupRates[row.group.id]"
                 />
                 <span v-else class="text-sm text-gray-400 dark:text-dark-500">{{
                   t('keys.noGroup')
@@ -272,6 +273,7 @@
                 :platform="(option as unknown as GroupOption).platform"
                 :subscription-type="(option as unknown as GroupOption).subscriptionType"
                 :rate-multiplier="(option as unknown as GroupOption).rate"
+                :user-rate-multiplier="(option as unknown as GroupOption).userRate"
               />
               <span v-else class="text-gray-400">{{ t('keys.selectGroup') }}</span>
             </template>
@@ -281,6 +283,7 @@
                 :platform="(option as unknown as GroupOption).platform"
                 :subscription-type="(option as unknown as GroupOption).subscriptionType"
                 :rate-multiplier="(option as unknown as GroupOption).rate"
+                :user-rate-multiplier="(option as unknown as GroupOption).userRate"
                 :description="(option as unknown as GroupOption).description"
                 :selected="selected"
               />
@@ -667,6 +670,7 @@
               :platform="option.platform"
               :subscription-type="option.subscriptionType"
               :rate-multiplier="option.rate"
+              :user-rate-multiplier="option.userRate"
               :description="option.description"
               :selected="
                 selectedKeyForGroup?.group_id === option.value ||
@@ -718,6 +722,7 @@ interface GroupOption {
   label: string
   description: string | null
   rate: number
+  userRate: number | null
   subscriptionType: SubscriptionType
   platform: GroupPlatform
 }
@@ -742,6 +747,7 @@ const groups = ref<Group[]>([])
 const loading = ref(false)
 const submitting = ref(false)
 const usageStats = ref<Record<string, BatchApiKeyUsageStats>>({})
+const userGroupRates = ref<Record<number, number>>({})
 
 const pagination = ref({
   page: 1,
@@ -825,6 +831,7 @@ const groupOptions = computed(() =>
     label: group.name,
     description: group.description,
     rate: group.rate_multiplier,
+    userRate: userGroupRates.value[group.id] ?? null,
     subscriptionType: group.subscription_type,
     platform: group.platform
   }))
@@ -899,6 +906,14 @@ const loadGroups = async () => {
   }
 }
 
+const loadUserGroupRates = async () => {
+  try {
+    userGroupRates.value = await userGroupsAPI.getUserGroupRates()
+  } catch (error) {
+    console.error('Failed to load user group rates:', error)
+  }
+}
+
 const loadPublicSettings = async () => {
   try {
     publicSettings.value = await authAPI.getPublicSettings()
@@ -1268,6 +1283,7 @@ const closeCcsClientSelect = () => {
 onMounted(() => {
   loadApiKeys()
   loadGroups()
+  loadUserGroupRates()
   loadPublicSettings()
   document.addEventListener('click', closeGroupSelector)
 })