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="cron_schedule" resource="default" engine="innodb" comment="Cron Schedule">
        <column xsi:type="int" name="schedule_id" padding="10" unsigned="true" nullable="false" identity="true"
                comment="Schedule Id"/>
        <column xsi:type="varchar" name="job_code" nullable="false" length="255" default="0" comment="Job Code"/>
        <column xsi:type="varchar" name="status" nullable="false" length="7" default="pending" comment="Status"/>
        <column xsi:type="text" name="messages" nullable="true" comment="Messages"/>
        <column xsi:type="timestamp" name="created_at" on_update="false" nullable="false" default="CURRENT_TIMESTAMP"
                comment="Created At"/>
        <column xsi:type="timestamp" name="scheduled_at" on_update="false" nullable="true" comment="Scheduled At"/>
        <column xsi:type="timestamp" name="executed_at" on_update="false" nullable="true" comment="Executed At"/>
        <column xsi:type="timestamp" name="finished_at" on_update="false" nullable="true" comment="Finished At"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="schedule_id"/>
        </constraint>
        <index referenceId="CRON_SCHEDULE_JOB_CODE" indexType="btree">
            <column name="job_code"/>
        </index>
        <index referenceId="CRON_SCHEDULE_SCHEDULED_AT_STATUS" indexType="btree">
            <column name="scheduled_at"/>
            <column name="status"/>
        </index>
    </table>
</schema>