EngineGP/system/library/cron/users_recovery_signup.php

<?php
if (!DEFINED('EGP'))
    exit(header('Refresh: 0; URL=http://' . $_SERVER['SERVER_NAME'] . '/404'));

class users_recovery_signup extends cron
{
    function __construct()
    {
        global $sql, $start_point;

        $time = $start_point - 86400;

        $sql->query('DELETE FROM `signup` WHERE `date`<"' . $time . '"');
        $sql->query('DELETE FROM `recovery` WHERE `date`<"' . $time . '"');

        return NULL;
    }
}

?>