Add New Column in admin_user table Magento 2.

You can add a new column field under the admin_user core table using the db_schema.xml file for Magento 2.3 and the Higher version.

The client has a requirement like, store the current user location based on their geographical area.

you can add a new column in any table using a simple call existing table in the db_schema.xml file.

<?xml version="1.0"?>
<schema xmlns:xsi=""
    <table name="admin_user" resource="default" engine="innodb" comment="Admin User Table">
        <column xsi:type="varchar" name="user_location" nullable="true" length="50" comment="User location"/>

We have added new column user_location, which contains the location of specific admin users in the admin_user table.

Run command from Magento root instance to see change on the table,
php bin/magento setup:upgrade

Go to the database and check admin_user table to see the new column into the table.