text: from hat import aio
  
  from aimm.server import common
  
  
  def create(conf, group, _):
      backend = DummyBackend()
      backend._group = group
      return backend
  
  
  class DummyBackend(common.Backend):
  
      @property
      def async_group(self) -> aio.Group:
          """Async group"""
          return self._group
  
      async def get_models(self):
          return []
  
      async def create_model(self, model):
          return
  
      async def update_model(self, model):
          return
  