docs: def node_created_handler(sender, **kwargs):
      """ send notification when a new node is created according to users's settings """
      if kwargs['created']:
          obj = kwargs['instance']
          queryset = exclude_owner_of_node(obj)
          create_notifications.delay(**{
              "users": queryset,
              "notification_model": Notification,
              "notification_type": "node_created",
              "related_object": obj
          })