public static function get_other_mapping() {
        return [
            'stepindex' => \core\event\base::NOT_MAPPED,
            'stepid'    => [
                'db'        => 'tool_usertours_steps',
                'restore'   => \core\event\base::NOT_MAPPED,
            ],
            'pageurl'   => \core\event\base::NOT_MAPPED,
        ];
    }