docs: def serialize_history_on_post_create(history_instance, using, **kwargs):
      """ Serialize the history instance as an OutgoingTransaction.
  
      Skip those not registered.
      """
      try:
          wrapped_instance = site_offline_models.get_wrapped_instance(history_instance)
      except ModelNotRegistered:
          pass
      else:
          wrapped_instance.to_outgoing_transaction(using, created=True)