return mixed
     */
    public static function deleteLogs()
    {
        global $wpdb;

        $sql  = "DELETE FROM `{$wpdb->base_prefix}otys_log`";

        return $wpdb->query(
            $sql,
            ARRAY_A
        );
    }

    /**
     * Check logs
     *
     * Removes logs which are older than 1 day
     *
     * @return mixed
     */
    public static function checkLogs()
    {
        global $wpdb;

        $sql  = "DELETE FROM `{$wpdb->base_prefix}otys_log` WHERE timestamp < (UNIX_TIMESTAMP() - 86400)";

        return $wpdb->query(
            $sql,
            ARRAY_A
        );
    }
}