uninstall.php
<?php
/**
* Called on plugin uninstall
*/
if (!defined('ABSPATH') && !defined('WP_UNINSTALL_PLUGIN'))
exit();
/* Call config files */
require(dirname(__FILE__) . '/config/config.php');
/* Delete the record from database */
delete_option(SQ_OPTION);
delete_user_option(SQ_META);