anchor.diff:                                              {line, ?LINE}, {body, Why}]),
                       {error, Why}
               end,
  -    {reply, Reply, State, ?DEF_TIMEOUT};
  +    {reply, Reply, State};
   
   handle_call({has_key, KeyBin}, _From, #state{backend_db_id = BackendDbId} = State) ->
       Reply = case catch leo_backend_db_server:get(BackendDbId, KeyBin) of
  
positive.code:                                             {line, ?LINE}, {body, Why}]),
                      {error, Why}
              end,
      {reply, Reply, State, ?DEF_TIMEOUT};
  
  %% handle_call(status, _From, #state{count = Count} = State) ->
  %%     {reply, {ok, Count}, State, ?DEF_TIMEOUT};
  
negative.code:                                             {line, ?LINE}, {body, Cause}]),
                      {error, Cause}
              end,
      {reply, Reply, State};
  
  handle_call({remove, KeyBin}, _From, #state{backend_db_id = BackendDbId} = State) ->
      Reply = case catch leo_backend_db_server:delete(BackendDbId, KeyBin) of
  