feat: implement coupon management and receive flow

backend/database/models/user_coupons.query.gen.go

@@ -29,7 +29,7 @@ func newUserCoupon(db *gorm.DB, opts ...gen.DOOption) userCouponQuery {
 	_userCouponQuery.UserID = field.NewInt64(tableName, "user_id")
 	_userCouponQuery.CouponID = field.NewInt64(tableName, "coupon_id")
 	_userCouponQuery.OrderID = field.NewInt64(tableName, "order_id")
-	_userCouponQuery.Status = field.NewString(tableName, "status")
+	_userCouponQuery.Status = field.NewField(tableName, "status")
 	_userCouponQuery.UsedAt = field.NewTime(tableName, "used_at")
 	_userCouponQuery.CreatedAt = field.NewTime(tableName, "created_at")
 
@@ -46,7 +46,7 @@ type userCouponQuery struct {
 	UserID    field.Int64
 	CouponID  field.Int64
 	OrderID   field.Int64
-	Status    field.String
+	Status    field.Field
 	UsedAt    field.Time
 	CreatedAt field.Time
 
@@ -69,7 +69,7 @@ func (u *userCouponQuery) updateTableName(table string) *userCouponQuery {
 	u.UserID = field.NewInt64(table, "user_id")
 	u.CouponID = field.NewInt64(table, "coupon_id")
 	u.OrderID = field.NewInt64(table, "order_id")
-	u.Status = field.NewString(table, "status")
+	u.Status = field.NewField(table, "status")
 	u.UsedAt = field.NewTime(table, "used_at")
 	u.CreatedAt = field.NewTime(table, "created_at")