newsupernova/vendor/magento/module-admin-notification/etc/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="adminnotification_inbox" resource="default" engine="innodb" comment="Adminnotification Inbox">
        <column xsi:type="int" name="notification_id" padding="10" unsigned="true" nullable="false" identity="true"
                comment="Notification id"/>
        <column xsi:type="smallint" name="severity" padding="5" unsigned="true" nullable="false" identity="false"
                default="0" comment="Problem type"/>
        <column xsi:type="timestamp" name="date_added" on_update="false" nullable="false" default="CURRENT_TIMESTAMP"
                comment="Create date"/>
        <column xsi:type="varchar" name="title" nullable="false" length="255" comment="Title"/>
        <column xsi:type="text" name="description" nullable="true" comment="Description"/>
        <column xsi:type="varchar" name="url" nullable="true" length="255" comment="Url"/>
        <column xsi:type="smallint" name="is_read" padding="5" unsigned="true" nullable="false" identity="false"
                default="0" comment="Flag if notification read"/>
        <column xsi:type="smallint" name="is_remove" padding="5" unsigned="true" nullable="false" identity="false"
                default="0" comment="Flag if notification might be removed"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="notification_id"/>
        </constraint>
        <index referenceId="ADMINNOTIFICATION_INBOX_SEVERITY" indexType="btree">
            <column name="severity"/>
        </index>
        <index referenceId="ADMINNOTIFICATION_INBOX_IS_READ" indexType="btree">
            <column name="is_read"/>
        </index>
        <index referenceId="ADMINNOTIFICATION_INBOX_IS_REMOVE" indexType="btree">
            <column name="is_remove"/>
        </index>
    </table>
    <table name="admin_system_messages" resource="default" engine="innodb" comment="Admin System Messages">
        <column xsi:type="varchar" name="identity" nullable="false" length="100" comment="Message id"/>
        <column xsi:type="smallint" name="severity" padding="5" unsigned="true" nullable="false" identity="false"
                default="0" comment="Problem type"/>
        <column xsi:type="timestamp" name="created_at" on_update="false" nullable="false" default="CURRENT_TIMESTAMP"
                comment="Create date"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="identity"/>
        </constraint>
    </table>
</schema>