<?php

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

function upgrade_module_1_19_0($module)
{
    $existing = Db::getInstance()->executeS(
        'SHOW COLUMNS FROM `' . _DB_PREFIX_ . 'ws_customhtml_group` LIKE \'default_block_class\''
    );

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

    return Db::getInstance()->execute(
        'ALTER TABLE `' . _DB_PREFIX_ . 'ws_customhtml_group`
         ADD COLUMN `default_block_class` VARCHAR(128) NOT NULL DEFAULT \'\' AFTER `custom_class`'
    );
}