docs: def cleanup_callbackredirect(max_age=300):
      """
      Delete old :model:`esi.CallbackRedirect` models.
      Accepts a max_age parameter, in seconds (default 300).
      """
      max_age = timezone.now() - timedelta(seconds=max_age)
      logger.debug("Deleting all callback redirects created before {0}".format(max_age.strftime("%b %d %Y %H:%M:%S")))
      CallbackRedirect.objects.filter(created__lte=max_age).delete()