server-tools/attachment_base_synchronize/data/cron.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data noupdate="1">
        
        <record model="ir.cron" id="cronjob_run_attachments_metadata">
            <field name='name'>Run Attachments Metadata</field>
            <field name='interval_number'>30</field>
            <field name='interval_type'>minutes</field>
            <field name="numbercall">-1</field>
            <field name="active">False</field>
            <field name="doall" eval="False" />
            <field name="model">ir.attachment.metadata</field>
            <field name="function">run_attachment_metadata_scheduler</field>
            <field name="args">([])</field>
        </record>

    </data>
</openerp>