Revert flush - address later

rhodecode/model/user.py

@@ -609,10 +609,6 @@ class UserModel(BaseModel):
                 if detach_artifacts:
                     self._detach_user_artifacts(user.username, user.artifacts, new_owner)
 
-                # Flush all detach operations to database before deleting user
-                # Ensures foreign keys are properly updated and prevents NULL constraint violations
-                self.sa.flush()
-
             user_data = user.get_dict()  # fetch user data before expire
 
             # we might change the user data with detach/delete, make sure