diff --git a/apps/cel/__init__.py b/apps/cel/__init__.py
index caa314b..bcb732a 100644
--- a/apps/cel/__init__.py
+++ b/apps/cel/__init__.py
@@ -17,5 +17,10 @@
         "task": "apps.chat.tasks.openrouter_model_sync",
         "schedule": crontab(minute="*/10"),
         "args": (),
-    }
+    },
+    "delete_old_history": {
+        "task": "apps.chat.tasks.delete_old_history",
+        "schedule": crontab(minute="0", hour="8"),
+        "args": (),
+    },
 }
diff --git a/apps/chat/tasks.py b/apps/chat/tasks.py
index 5d37b0d..3225a1e 100644
--- a/apps/chat/tasks.py
+++ b/apps/chat/tasks.py
@@ -134,11 +134,17 @@ def delete_old_history(self):
     celery_logger.info("[DeleteOldMessageHistory] Start %s", self.request.id)
 
     logs = ChatMessageChangeLog.objects.filter(
-        updated_lt=(timezone.now() - datetime.timedelta(days=settings.MESSAGE_LOG_RETAIN_DAYS))
+        created_at__lt=(timezone.now() - datetime.timedelta(days=settings.MESSAGE_LOG_RETAIN_DAYS))
     ).prefetch_related("user")
     celery_logger.info("[DeleteOldMessageHistory] Total: %d", logs.count())
     for log in logs:
-        celery_logger.info("[DeleteOldMessageHistory] User: %s; MessageID: %s", log.user, log.message_id)
+        celery_logger.info(
+            "[DeleteOldMessageHistory] ID: %d; User: %s; MessageID: %s; CreatedAt: %s",
+            log.id,
+            log.user,
+            log.message_id,
+            log.created_at,
+        )
     logs.delete()
 
     celery_logger.info("[DeleteOldMessageHistory] End %s", self.request.id)