docs: def create_layer_rating_settings(sender, **kwargs):
      """ create layer rating settings """
      created = kwargs['created']
      layer = kwargs['instance']
      if created:
          # create layer participation settings
          # task will be executed in background unless settings.CELERY_ALWAYS_EAGER is True
          # if CELERY_ALWAYS_EAGER is False celery worker must be running otherwise task won't be executed
          create_related_object.delay(LayerParticipationSettings, {'layer': layer})