code: def find_behind_subscriptions():
      
      subscriptions = Subscription.objects.filter(
          active=True, completed=False, process_status=0
      ).values_list("id", flat=True)
      for subscription_id in subscriptions.iterator():
          calculate_subscription_lifecycle.delay(str(subscription_id))
docs: Finds any subscriptions that are behind according to where they should be,
      and creates a BehindSubscription entry for them.