append pgsql to the php config

ajax/db.php

@@ -1,6 +1,7 @@
 <?php
   ini_set('display_errors', 1);
   ini_set('display_startup_errors', 1);
+  ini_set('extension', 'pgsql');
   error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
 
   $db = "host=clusterpg.linux.infra.cloud.local port=5432 dbname=sig50 user=sigr password=T38Msh2R4q";