增加客服分组管理

backend/internal/modules/chat/support.go

@@ -34,9 +34,13 @@ type AdminConversationCountsDTO struct {
 func (r *Repository) TransferConversation(ctx context.Context, principal Principal, conversationID uint64, toAdminID uint64) error {
 	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		// 验证当前操作者是会话参与者
-		if _, err := r.findParticipant(tx, principal, conversationID, false); err != nil {
+		current, err := r.findParticipant(tx, principal, conversationID, false)
+		if err != nil {
 			return err
 		}
+		if current.Role != "support" || current.ParticipantType != "admin" {
+			return ErrPermissionDenied
+		}
 		// 验证目标客服存在、活跃且拥有客服角色，避免转接给超级管理员。
 		if !adminIsSupport(tx, toAdminID) {
 			return fmt.Errorf("目标客服不存在、已禁用或不是客服角色")
@@ -51,20 +55,13 @@ func (r *Repository) TransferConversation(ctx context.Context, principal Princip
 		if count > 0 {
 			return fmt.Errorf("该客服已在会话中")
 		}
-		// 删除原客服参与者
-		if err := tx.Where("conversation_id = ? AND participant_type = ? AND role = ?", conversationID, "admin", "support").
-			Delete(&model.ChatParticipant{}).Error; err != nil {
-			return err
-		}
-		// 添加新客服参与者
-		participant := model.ChatParticipant{
-			ConversationID:  conversationID,
-			ParticipantType: "admin",
-			ParticipantID:   toAdminID,
-			Role:            "support",
-			JoinedAt:        time.Now(),
-		}
-		if err := tx.Create(&participant).Error; err != nil {
+		// 只转接当前客服本人，避免误删同群里的收号组/卖号组其他客服。
+		if err := tx.Model(&model.ChatParticipant{}).
+			Where("id = ?", current.ID).
+			Updates(map[string]interface{}{
+				"participant_id": toAdminID,
+				"joined_at":      time.Now(),
+			}).Error; err != nil {
 			return err
 		}
 		// 添加系统消息记录转接