sub _save {
   my $session = $req->content;

   lock %times;
   lock %nicks;
   lock %sessions;
   $times{$session->{ID}} = time;
   $nicks{$session->{ID}} = $session->{PLAYER}->get('nickname') unless $session->{PLAYER}->anonymus;

   $sessions{$session->{ID}} = $session;
   $logs->enqueue("save request: stored session $session->{ID}") if $debug;
   $res->content({});
}