muk_web/muk_web_utils/data/autovacuum.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--

    Copyright (c) 2017-2019 MuK IT GmbH.

    This file is part of MuK Web Utils 
    (see https://mukit.at).

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program. If not, see <http://www.gnu.org/licenses/>.

  -->

<odoo noupdate="1">

	<record id="autovacuum_temporary_attachments" model="muk_autovacuum.rules">
        <field name="name">Delete temporary Attachments</field>
        <field name="model" ref="base.model_ir_attachment"/>
        <field name="active" eval="True" />
        <field name="state">domain</field>
        <field name="domain">[('temporary','=',True), ('create_date', '&lt;=', (datetime.datetime.utcnow() - datetime.timedelta(hours=24)).strftime('%Y-%m-%d %H:%M:%S'))]</field>
        <field name="protect_starred" eval="False" />
    </record>

</odoo>