db_schema.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
    <table name="queue_lock" resource="default" engine="innodb"
           comment="Messages that were processed are inserted here to be locked.">
        <column xsi:type="int" name="id" padding="10" unsigned="true" nullable="false" identity="true"
                comment="Message ID"/>
        <column xsi:type="varchar" name="message_code" nullable="false" length="255" default="" comment="Message Code"/>
        <column xsi:type="timestamp" name="created_at" on_update="true" nullable="false" default="CURRENT_TIMESTAMP"
                comment="Created At"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="id"/>
        </constraint>
        <constraint xsi:type="unique" referenceId="QUEUE_LOCK_MESSAGE_CODE">
            <column name="message_code"/>
        </constraint>
    </table>
</schema>