diff --git a/backend/app/modules/data_process/store.py b/backend/app/modules/data_process/store.py
index 520173f..df6ed3e 100644
--- a/backend/app/modules/data_process/store.py
+++ b/backend/app/modules/data_process/store.py
@@ -549,10 +549,6 @@ class DataProcessStore:
                 recovered_count += 1
 
             now = utcnow()
-            published_at = max(
-                (dataset.get("created_at") for dataset in datasets if dataset.get("created_at")),
-                default=None,
-            )
             conn.execute(
                 """
                 UPDATE data_process_tasks
@@ -560,15 +556,13 @@ class DataProcessStore:
                     output_count=%s, filtered_count=0, duplicate_count=0,
                     error_count=(SELECT COUNT(*) FROM data_process_results
                                  WHERE task_id=%s AND status='invalid'),
-                    failure_reason=NULL, completed_at=COALESCE(completed_at, %s),
-                    updated_at=%s
+                    failure_reason=NULL, updated_at=%s
                 WHERE id=%s
                 """,
                 (
                     train_dataset["id"],
                     recovered_count,
                     task_id,
-                    published_at,
                     now,
                     task_id,
                 ),
diff --git a/backend/tests/test_data_process_store.py b/backend/tests/test_data_process_store.py
index 2101688..220a220 100644
--- a/backend/tests/test_data_process_store.py
+++ b/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