docs: def get_instance_by_bin_uuid(model, bin_uuid):
      """Get an instance by binary uuid.
  
      :param model: a string, model name in rio.models.
      :param bin_uuid: a 16-bytes binary string.
      :return: None or a SQLAlchemy instance.
      """
      try:
          model = get_model(model)
      except ImportError:
          return None
  
      return model.query.filter_by(**{'bin_uuid': bin_uuid}).first()