class Order(models.Model): status = models.CharField(verbose_name='Status') completed_date = models.DateTimeField(null=True) def send_message(order: Order): # Wysyła wiadomość do TG ... def check_cancelled_orders(): batch = 10000 offset = 0 while True: cancelled_orders = Order.objects.filter( status='cancelled', completed_date__is_null=True )[offset: offset+batch] if not cancelled_orders: break offset += batch completed_date = now() for order in cancelled_orders: send_message(order) Order.objects.bulk_update(cancelled_orders, ['completed_date'])