MAPG-185 switch off builtin session gc

web.php

@@ -67,7 +67,8 @@ if (isset($_COOKIE['COOKIES_CONSENT'])) {
     session_set_save_handler(Container::$sessionHandler, true);
     session_start([
         'gc_maxlifetime' => 604800,
-        'cookie_lifetime' => 604800,
+        'gc_probability' => 0, // old sessions are deleted by MaintainDatabaseCommand
+        'cookie_lifetime' => 604800, // TODO: cookie is not renewed so session can be lost
         'cookie_httponly' => true,
         'cookie_samesite' => 'Lax'
     ]);