use Unix domain socket

davical/davical-config.php

@@ -7,7 +7,7 @@ $c->system_name                 = "DAViCal CalDAV Server";
 $c->domain_name                 = "calendar.example.com";
 $c->admin_email                 = 'hostmaster@example.com';
 
-$c->pg_connect[]                = "dbname=davical user=davical port=5433 host=localhost password=davical";
+$c->pg_connect[]                = "dbname=davical user=davical password=davical";
 
 $c->home_calendar_name          = 'home';
 $c->hide_TODO                   = true;