Bookmark.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Ui\Model\ResourceModel;

use Magento\Framework\Model\ResourceModel\Db\AbstractDb;

/**
 * Bookmark resource
 */
class Bookmark extends AbstractDb
{
    /**
     * @param \Magento\Framework\Model\ResourceModel\Db\Context $context
     * @param string $connectionName
     */
    public function __construct(
        \Magento\Framework\Model\ResourceModel\Db\Context $context,
        $connectionName = null
    ) {
        parent::__construct($context, $connectionName);
    }

    /**
     * Resource initialization
     *
     * @return void
     */
    protected function _construct()
    {
        $this->_init('ui_bookmark', 'bookmark_id');
    }
}