优化支付配置启用规则

backend/internal/modules/paymentconfig/repository.go

@@ -171,15 +171,6 @@ func (r *Repository) Create(req CreateRequest, actorID uint64, meta AuditMeta) (
 
 	var dto ConfigDTO
 	err := r.db.Transaction(func(tx *gorm.DB) error {
-		// 如果设置为默认，先取消同 provider 的其他默认配置
-		if req.IsDefault {
-			if err := tx.Model(&model.PaymentMerchantConfig{}).
-				Where("provider = ? AND is_default = ?", req.Provider, true).
-				Update("is_default", false).Error; err != nil {
-				return err
-			}
-		}
-
 		// 加密密钥
 		encryptedSignKey, err := r.encryptor.Encrypt(req.SignKey)
 		if err != nil {
@@ -198,6 +189,15 @@ func (r *Repository) Create(req CreateRequest, actorID uint64, meta AuditMeta) (
 		if environment == "" {
 			environment = "production"
 		}
+		isDefault := req.IsDefault
+		if status == "active" {
+			if err := deactivateOtherConfigs(tx, 0, actorID); err != nil {
+				return err
+			}
+			isDefault = true
+		} else {
+			isDefault = false
+		}
 
 		item := model.PaymentMerchantConfig{
 			Name:         req.Name,
@@ -212,7 +212,7 @@ func (r *Repository) Create(req CreateRequest, actorID uint64, meta AuditMeta) (
 			JSPayFlag:    firstNonEmpty(req.JSPayFlag, "2"),
 			SignType:     firstNonEmpty(req.SignType, defaultSignType(req.Provider)),
 			ExtraConfig:  req.ExtraConfig,
-			IsDefault:    req.IsDefault,
+			IsDefault:    isDefault,
 			Status:       status,
 			Environment:  environment,
 			BusinessTags: req.BusinessTags,
@@ -247,6 +247,9 @@ func (r *Repository) Update(id uint64, req UpdateRequest, actorID uint64, meta A
 	if req.SignType != nil && *req.SignType != "" && !isValidSignType(*req.SignType) {
 		return nil, ErrInvalidSignType
 	}
+	if req.Status != nil && !isValidStatus(*req.Status) {
+		return nil, ErrInvalidStatus
+	}
 	if req.NotifyURL != nil && *req.NotifyURL == "" {
 		return nil, ErrNotifyURLRequired
 	}
@@ -261,15 +264,6 @@ func (r *Repository) Update(id uint64, req UpdateRequest, actorID uint64, meta A
 			return err
 		}
 
-		// 如果设置为默认，先取消同 provider 的其他默认配置
-		if req.IsDefault != nil && *req.IsDefault && !item.IsDefault {
-			if err := tx.Model(&model.PaymentMerchantConfig{}).
-				Where("provider = ? AND is_default = ? AND id != ?", item.Provider, true, id).
-				Update("is_default", false).Error; err != nil {
-				return err
-			}
-		}
-
 		updates := make(map[string]any)
 		if req.Name != nil {
 			updates["name"] = *req.Name
@@ -326,6 +320,20 @@ func (r *Repository) Update(id uint64, req UpdateRequest, actorID uint64, meta A
 		}
 		updates["updated_by"] = actorID
 
+		finalStatus := item.Status
+		if req.Status != nil {
+			finalStatus = *req.Status
+		}
+		if finalStatus == "active" {
+			if err := deactivateOtherConfigs(tx, id, actorID); err != nil {
+				return err
+			}
+			updates["status"] = "active"
+			updates["is_default"] = true
+		} else {
+			updates["is_default"] = false
+		}
+
 		if err := tx.Model(&item).Updates(updates).Error; err != nil {
 			return err
 		}
@@ -430,6 +438,20 @@ func (r *Repository) RecordUsage(configID uint64, paymentOrderID uint64, provide
 	})
 }
 
+// deactivateOtherConfigs 保证全局同一时间只有一个启用配置。
+func deactivateOtherConfigs(tx *gorm.DB, activeID uint64, actorID uint64) error {
+	db := tx.Model(&model.PaymentMerchantConfig{}).
+		Where("status = ? OR is_default = ?", "active", true)
+	if activeID > 0 {
+		db = db.Where("id != ?", activeID)
+	}
+	return db.Updates(map[string]any{
+		"status":     "disabled",
+		"is_default": false,
+		"updated_by": actorID,
+	}).Error
+}
+
 // toDTO 转换为 DTO
 func (r *Repository) toDTO(item model.PaymentMerchantConfig, includeSecret bool) (ConfigDTO, error) {
 	dto := ConfigDTO{
@@ -492,6 +514,9 @@ func (r *Repository) validateCreateRequest(req CreateRequest) error {
 	if req.SignType != "" && !isValidSignType(req.SignType) {
 		return ErrInvalidSignType
 	}
+	if req.Status != "" && !isValidStatus(req.Status) {
+		return ErrInvalidStatus
+	}
 
 	// leshua 特定验证
 	if req.Provider == "leshua" {
@@ -555,6 +580,10 @@ func isValidSignType(value string) bool {
 	return value == "MD5" || value == "SHA256withRSA"
 }
 
+func isValidStatus(value string) bool {
+	return value == "active" || value == "disabled" || value == "testing"
+}
+
 func extraString(config map[string]any, key string) string {
 	if config == nil {
 		return ""