OroCRM example for user migration

UserMigration.php

<?php

namespace Ecowala\UserCRMBundle\Migrations\Schema\v1_1;

use Doctrine\DBAL\Schema\Schema;
use Oro\Bundle\EntityExtendBundle\EntityConfig\ExtendScope;
use Oro\Bundle\MigrationBundle\Migration\Migration;
use Oro\Bundle\MigrationBundle\Migration\QueryBag;

class UserMigration implements Migration
{
    public function up(Schema $schema, QueryBag $queries)
    {
        $table = $schema->getTable('oro_user');
        $table->addColumn('origin', 'text',
            array(
                'notnull' => false,
                'oro_options' => array(
                    'extend' => array('is_extend' => true, 'owner' => ExtendScope::OWNER_CUSTOM),
                    'datagrid' => array('is_visible' => true),
                    'merge' => array('display' => true),
                ))
        );
    }
}