Wordpress - Delete auto-drafts

gistfile1.txt

if (is_admin()){
		if ( !get_option('db_last_auto_cnl') || (get_option('db_last_auto_cnl') < time()- 86400) )  {
			global  $wpdb;
			$del= $wpdb->query("DELETE FROM $wpdb->posts WHERE post_status = 'auto-draft'");
			$del= $wpdb->query("DELETE FROM $wpdb->posts WHERE post_type = 'revision'");
			$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_timeout_rss%'");
			$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_rss_%'");
			$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_timeout_feed_%'");
			$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_feed_%'");
			//if you want, you can uncomment these too
			//$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_dash_%'");
			//$del= $wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '_transient_timeout_dash_%'");
			update_option('db_last_auto_cnl',time());
		}
	}