anchor.diff:  get_user_info(UserId) ->
       retrieve_user_info(UserId).
   
  +
  +
  +-record(state, {
  +}).
  +
   %% gen_server.
  +-include("tts.hrl").
   
   init([]) ->
   	{ok, #state{}}.
  
positive.code: 
  
  sync_insert_new_user(UserInfo) ->
      UserIdList = maps:get(user_ids,UserInfo,[]),
      UserId = maps:get(uid, UserInfo),
      case add_new_user_entries(UserIdList,UserId,UserInfo) of
          ok -> 
              {ok, UserId};
          {error, already_exists} ->
  
negative.code:         Other -> Other
      end.
  
  %% delete_user(UserInfo) ->
  %%     MappingList = maps:get(user_ids,UserInfo,[]),
  %%     UserId = maps:get(uid, UserInfo),
  %%     tts_data:user_delete_mappings(MappingList),
  %%     tts_data:user_delete_data(UserId).
  
  