Salesattribute
Install Magento 2 sales order attributes programmatically.
Use the snippet in the Magento 2 module creator.
Files
etc/db_schema.xml
<?xml version="1.0" ?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
<table name="quote">
<column name="test" nullable="true" xsi:type="None" comment="Test" length="null"/>
</table>
</schema>