Fix /v1/admin/stats всегда пустые данные

Добавлено поле с датой последнего логина пользователям и админам  #20

src/core/core_user.erl

@@ -1,7 +1,7 @@
 -module(core_user).
 -include("records.hrl").
 
--export([create/2, get_by_id/1, get_by_email/1, update/2, update_status/3, delete/1]).
+-export([create/2, get_by_id/1, get_by_email/1, update/2, update_status/3, delete/1, update_last_login/1]).
 -export([email_exists/1]).
 -export([generate_id/0]).
 -export([list_users/0]).
@@ -80,6 +80,15 @@ update(Id, Updates) ->
     {aborted, Reason} -> {error, Reason}
   end.
 
+update_last_login(Id) ->
+  case get_by_id(Id) of
+    {ok, User} ->
+      Updated = User#user{last_login = calendar:universal_time()},
+      mnesia:dirty_write(Updated),
+      {ok, Updated};
+    Error -> Error
+  end.
+
 update_status(Id, Status, Reason) ->
   case get_by_id(Id) of
     {ok, User} ->