server-tools/user_immutable/data/user_immutable_data.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017 LasLabs Inc.
     License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl). -->

<odoo noupdate="1">

    <record id="group_immutable" model="res.groups">
        <field name="name">Immutable</field>
        <field name="category_id" ref="base.module_category_hidden"/>
        <field name="users" eval="[(4, ref('base.user_root'))]"/>
    </record>

</odoo>