fix(data-process): 保留可验证的任务耗时

backend/tests/test_data_process_store.py

@@ -448,7 +448,6 @@ class _LegacyRecoveryConnection:
                     "progress": 100,
                     "output_dataset_id": params[0],
                     "output_count": params[1],
-                    "completed_at": params[3],
                 }
             )
             return _Result()
@@ -741,6 +740,8 @@ def test_legacy_aborted_regeneration_recovers_results_and_published_state() -> N
     assert conn.task["progress"] == 100
     assert conn.task["output_dataset_id"] == "dataset_train"
     assert conn.task["output_count"] == 2
+    assert conn.task["started_at"] is None
+    assert conn.task["completed_at"] is None
     assert [item["id"] for item in conn.results] == ["result_train", "result_test"]
     assert conn.results[0]["preview_item_id"] == "preview_1"
     assert conn.results[1]["preview_item_id"] is None