docs: def get_signal_models(self):
          """Return all signal types in a list.
  
          :rtype: list(`signal-model`)
  
          """
  
          base = self.db.Model
          return [
              cls for cls in base._decl_class_registry.values() if (
                  isinstance(cls, type)
                  and issubclass(cls, base)
                  and hasattr(cls, 'send_signalbus_message')
              )
          ]