server-tools/database_cleanup/views/purge_wizard.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="form_purge_wizard" model="ir.ui.view">
        <field name="model">cleanup.purge.wizard</field>
        <field name="arch" type="xml">
            <form>
                <header>
                    <button type="object" name="purge_all" string="Purge all" class="oe_highlight" />
                    <button type="object" name="select_lines" string="Select lines" />
                </header>
                <div attrs="{'invisible': [('purge_line_ids', '!=', [])]}">
                    Nothing found to clean up.
                </div>
                <field name="purge_line_ids" attrs="{'invisible': [('purge_line_ids', '=', [])]}">
                    <form>
                        <group>
                            <field name="name" />
                            <field name="purged" />
                        </group>
                        <footer>
                            <button type="object" name="purge" class="oe_highlight"
                                    string="Purge"
                                    attrs="{'invisible': [('purged', '=', True)]}"/>
                        </footer>
                    </form>
                </field>
            </form>
        </field>
    </record>
    <record id="tree_purge_line" model="ir.ui.view">
        <field name="model">cleanup.purge.line</field>
        <field name="arch" type="xml">
            <tree string="Purge models" delete="false" create="false">
                <field name="name" />
                <field name="purged" />
                <button type="object" name="purge"
                    icon="gtk-cancel" string="Purge this model"
                    attrs="{'invisible': [('purged', '=', True)]}"/>
            </tree>
        </field>
    </record>
</odoo>