code: def tail(self, limit=25, **fetch_kwargs):
          
          return self.fetch(order_by="KEY DESC", limit=limit, **fetch_kwargs)[::-1]
docs: shortcut to fetch the last few entries from query expression.
          Equivalent to fetch(order_by="KEY DESC", limit=25)[::-1]
          :param limit:  number of entries
          :param fetch_kwargs: kwargs for fetch
          :return: query result