Create a new database table in Magento

Just like this vendor/magento/module-catalog/etc/db_schema.xml file in the Magento Catalog module, we will create our own using this schema node as the base. Let’s copy the prolog and this node, and paste it into our own db_schema.xml file.

Our db file will go in our etc folder, and be named db_schema.xml. Let’s paste in the contents, removing the Magento comments since this will be our module. Then we can close up this schema node.

<?xml version="1.0"?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        x...