magento-test/app/code/Magento/MediaGallery/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="media_gallery_asset" resource="default" engine="innodb" comment="Media Gallery Asset">
        <column xsi:type="int" name="id" unsigned="true" nullable="false" identity="true" comment="Entity ID"/>
        <column xsi:type="text" name="path" nullable="true" comment="Path"/>
        <column xsi:type="varchar" name="title" length="255" nullable="true" comment="Title"/>
        <column xsi:type="text" name="description" nullable="true" comment="Description"/>
        <column xsi:type="varchar" name="source" length="255" nullable="true" comment="Source"/>
        <column xsi:type="varchar" name="hash" length="255" nullable="true" comment="File hash"/>
        <column xsi:type="varchar" name="content_type" length="255" nullable="true" comment="Content Type"/>
        <column xsi:type="int" name="width" unsigned="true" nullable="false" identity="false" default="0" comment="Width"/>
        <column xsi:type="int" name="height" unsigned="true" nullable="false" identity="false" default="0" comment="Height"/>
        <column xsi:type="int" name="size" unsigned="true" nullable="false" identity="false" comment="Asset file size in bytes"/>
        <column xsi:type="timestamp" name="created_at" on_update="false" nullable="false" default="CURRENT_TIMESTAMP" comment="Created At"/>
        <column xsi:type="timestamp" name="updated_at" on_update="true" nullable="false" default="CURRENT_TIMESTAMP" comment="Updated At"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="id"/>
        </constraint>
        <index referenceId="MEDIA_GALLERY_ID" indexType="btree">
            <column name="id"/>
        </index>
        <index referenceId="MEDIA_GALLERY_ASSET_TITLE" indexType="fulltext">
            <column name="title"/>
        </index>
    </table>
    <table name="media_gallery_keyword" resource="default" engine="innodb" comment="Media Gallery Keyword">
        <column xsi:type="int" name="id" unsigned="true" nullable="false" identity="true" comment="Keyword ID"/>
        <column xsi:type="varchar" length="255" name="keyword" nullable="false" comment="Keyword"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="id"/>
        </constraint>
        <index referenceId="MEDIA_GALLERY_KEYWORD" indexType="btree">
            <column name="id"/>
        </index>
        <constraint xsi:type="unique" referenceId="MEDIA_GALLERY_KEYWORD_KEYWORD_UNIQUE">
            <column name="keyword"/>
        </constraint>
    </table>
    <table name="media_gallery_asset_keyword" resource="default" engine="innodb" comment="Media Gallery Asset Keyword">
        <column xsi:type="int" name="keyword_id" unsigned="true" nullable="false" identity="false" comment="Keyword Id"/>
        <column xsi:type="int" name="asset_id" unsigned="true" nullable="false" identity="false" comment="Asset ID"/>
        <index referenceId="MEDIA_GALLERY_ASSET_KEYWORD_ASSET_ID_INDEX" indexType="btree">
            <column name="asset_id"/>
        </index>
        <index referenceId="MEDIA_GALLERY_ASSET_KEYWORD_KEYWORD_ID_INDEX" indexType="btree">
            <column name="keyword_id"/>
        </index>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="keyword_id"/>
            <column name="asset_id"/>
        </constraint>
        <constraint xsi:type="foreign" referenceId="MEDIA_GALLERY_KEYWORD_KEYWORD_ID_MEDIA_GALLERY_KEYWORD_ID" table="media_gallery_asset_keyword" column="keyword_id" referenceTable="media_gallery_keyword" referenceColumn="id" onDelete="CASCADE"/>
        <constraint xsi:type="foreign" referenceId="MEDIA_GALLERY_KEYWORD_ASSET_ID_ASSET_ID" table="media_gallery_asset_keyword" column="asset_id" referenceTable="media_gallery_asset" referenceColumn="id" onDelete="CASCADE"/>
    </table>
</schema>