diff --git a/backend/ent/schema/mixins/soft_delete.go b/backend/ent/schema/mixins/soft_delete.go
index 03a3899d..9f98a422 100644
--- a/backend/ent/schema/mixins/soft_delete.go
+++ b/backend/ent/schema/mixins/soft_delete.go
@@ -112,9 +112,6 @@ func (d SoftDeleteMixin) Hooks() []ent.Hook {
 				// 类型断言，获取 mutation 的扩展接口
 				mx, ok := m.(interface {
 					SetOp(ent.Op)
-					Client() interface {
-						Mutate(context.Context, ent.Mutation) (ent.Value, error)
-					}
 					SetDeletedAt(time.Time)
 					WhereP(...func(*sql.Selector))
 				})
@@ -127,7 +124,7 @@ func (d SoftDeleteMixin) Hooks() []ent.Hook {
 				mx.SetOp(ent.OpUpdate)
 				// 设置删除时间为当前时间
 				mx.SetDeletedAt(time.Now())
-				return mx.Client().Mutate(ctx, m)
+				return next.Mutate(ctx, m)
 			})
 		},
 	}
diff --git a/backend/internal/repository/user_repo.go b/backend/internal/repository/user_repo.go
index c81225ff..3ffb00f3 100644
--- a/backend/internal/repository/user_repo.go
+++ b/backend/internal/repository/user_repo.go
@@ -169,8 +169,14 @@ func (r *userRepository) Update(ctx context.Context, userIn *service.User) error
 }
 
 func (r *userRepository) Delete(ctx context.Context, id int64) error {
-	_, err := r.client.User.Delete().Where(dbuser.IDEQ(id)).Exec(ctx)
-	return err
+	affected, err := r.client.User.Delete().Where(dbuser.IDEQ(id)).Exec(ctx)
+	if err != nil {
+		return translatePersistenceError(err, service.ErrUserNotFound, nil)
+	}
+	if affected == 0 {
+		return service.ErrUserNotFound
+	}
+	return nil
 }
 
 func (r *userRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.User, *pagination.PaginationResult, error) {
diff --git a/backend/internal/service/admin_service.go b/backend/internal/service/admin_service.go
index 9ffd342d..4be09810 100644
--- a/backend/internal/service/admin_service.go
+++ b/backend/internal/service/admin_service.go
@@ -366,7 +366,11 @@ func (s *adminServiceImpl) DeleteUser(ctx context.Context, id int64) error {
 	if user.Role == "admin" {
 		return errors.New("cannot delete admin user")
 	}
-	return s.userRepo.Delete(ctx, id)
+	if err := s.userRepo.Delete(ctx, id); err != nil {
+		log.Printf("delete user failed: user_id=%d err=%v", id, err)
+		return err
+	}
+	return nil
 }
 
 func (s *adminServiceImpl) UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*User, error) {