shipping-notifications/ShippingNotifications/etc/db_schema.xml

<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
    <table name="cpcommerce_shipping_notification_categories" resource="default" engine="innodb" comment="CP-Commerce Shipping Notification Delayed Categories">
        <column xsi:type="int" name="ship_categ_id" padding="6" nullabe="false" identity="true"/>
        <column xsi:type="varchar" name="ship_categ" length="255" nullable="false" />

        <constraint xsi:type="primary" referenceId="ship_categ_id">
            <column name="ship_categ_id" />
        </constraint>
    </table>
</schema>