First commit

backend/internal/model/account_group.go

@@ -0,0 +1,20 @@
+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"
+}