anchor.diff:                      case ets:lookup(?ETS_TABLE_NAME, InstanceName) of
                           [] ->
                               true = ets:insert(?ETS_TABLE_NAME, {InstanceName, Ret});
  -                        {InstanceName, List} ->
  +                        [{InstanceName, List}|_] ->
                               true = ets:delete(?ETS_TABLE_NAME, InstanceName),
                               true = ets:insert(?ETS_TABLE_NAME, {InstanceName, List ++ Ret})
                       end,
  
positive.code:     case ets:lookup(?ETS_TABLE_NAME, InstanceName) of
          [] ->
              {error, not_found};
          [{_, List}] ->
              lists:foreach(
                fun(Id) ->
                        case supervisor:terminate_child(leo_backend_db_sup, Id) of
  
negative.code:                           Error ->
                                Error
                        end
                end, List),
              ok
      end.
  
  
  