anchor.diff:        case ets:take(barrel_dbs, DbId) of
           [] -> State;
           [_Db] ->
  -          lager:warning("database ~p is down~n", [DbId]),
  +          lager:warning("~s: database ~p is down~n", [?MODULE_STRING, DbId]),
             ets:delete(barrel_dbs, DbId),
             State#{db_pids => DbPids2}
         end
  
positive.code:   end.
  
  do_delete_db(DbId, State = #{ conf := Conf, db_pids := DbPids }) ->
    case ets:take(barrel_dbs, DbId) of
      [] ->
        lager:info("no database ~p ~n", [DbId]),
  
negative.code:       case gen_server:call(Pid, delete_db) of
          ok ->
            lager:info("database ~p deleted ~n", [DbId]),
            DbPids2 = maps:remove(Pid, DbPids),
            #{ <<"databases">> := Dbs } = Conf,
            Dbs2 = lists:filter(
              fun
  