<?php

if (!defined('_PS_VERSION_')) {
    exit;
}

function upgrade_module_1_17_0($module)
{
    $existing = Db::getInstance()->executeS(
        'SHOW COLUMNS FROM `' . _DB_PREFIX_ . 'ws_customhtml` LIKE \'slider_mode\''
    );

    if (!empty($existing)) {
        return true;
    }

    return Db::getInstance()->execute(
        'ALTER TABLE `' . _DB_PREFIX_ . 'ws_customhtml`
         ADD COLUMN `slider_mode` VARCHAR(16) NOT NULL DEFAULT \'always\' AFTER `timeout`'
    );
}