DBのコネクションが閉じてエラーになる

[re3turn]

psycopg2.InterfaceError: connection already closedException
24 Oct 2019 17:29:20.128131 <190>190 2019-10-24T08:29:19.5762+00:00 app worker.1 - - Traceback (most recent call last):
  File "/app/app/crawler.py", line 136, in retry_backup_media
    for url, description, user_id in self.store.fetch_all_failed_upload_medias():
  File "/app/app/store.py", line 67, in fetch_all_failed_upload_medias
    with self._connection.cursor() as cursor: