refactor(remove_app_and_related_data_task): Remove 'expire_on_commit' to prevent session issues

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/tasks/remove_app_and_related_data_task.py

@@ -192,7 +192,7 @@ def _delete_app_workflows(tenant_id: str, app_id: str):
 
 def _delete_app_workflow_runs(tenant_id: str, app_id: str):
     """Delete all workflow runs for an app using the service repository."""
-    session_maker = sessionmaker(bind=db.engine, expire_on_commit=False)
+    session_maker = sessionmaker(bind=db.engine)
     workflow_run_repo = DifyAPIRepositoryFactory.create_api_workflow_run_repository(session_maker)
 
     deleted_count = workflow_run_repo.delete_runs_by_app(
@@ -206,7 +206,7 @@ def _delete_app_workflow_runs(tenant_id: str, app_id: str):
 
 def _delete_app_workflow_node_executions(tenant_id: str, app_id: str):
     """Delete all workflow node executions for an app using the service repository."""
-    session_maker = sessionmaker(bind=db.engine, expire_on_commit=False)
+    session_maker = sessionmaker(bind=db.engine)
     node_execution_repo = DifyAPIRepositoryFactory.create_api_workflow_node_execution_repository(session_maker)
 
     deleted_count = node_execution_repo.delete_executions_by_app(