Convert @ to : in parameter names

- Still more to do; possible connection exhaustion

src/public/index.php

@@ -21,6 +21,7 @@ if (key_exists('refresh', $_GET)) {
         add_error(nl2br($refreshResult['error']));
     }
 }
+//const PDO_DOC_DEBUG_SQL = true;
 
 $list = match (true) {
     key_exists('bookmarked', $_GET) => ItemList::allBookmarked(),