app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.35-0.7.36.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

$installer = $this;
/* @var $installer Mage_Catalog_Model_Resource_Eav_Mysql4_Setup */

$installer->startSetup();
try {
    $installer->run("
        ALTER TABLE `{$installer->getTable('catalog_category_entity')}` ADD `level` INT NOT NULL;
        ALTER TABLE `{$installer->getTable('catalog_category_entity')}` ADD INDEX `IDX_LEVEL` ( `level` );
    ");
} catch (Exception $e) {
}

$installer->rebuildCategoryLevels();

$installer->addAttribute('catalog_category', 'level', array(
                        'type'              => 'static',
                        'backend'           => '',
                        'frontend'          => '',
                        'label'             => 'Level',
                        'input'             => '',
                        'class'             => '',
                        'source'            => '',
                        'global'            => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,
                        'visible'           => false,
                        'required'          => false,
                        'user_defined'      => false,
                        'default'           => '',
                        'searchable'        => false,
                        'filterable'        => false,
                        'comparable'        => false,
                        'visible_on_front'  => false,
                        'unique'            => false,
                    ));

$installer->endSetup();

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