state is not set to code on the AutoVacuum Job Queue ir.cron data record, so the default action object_write is assigned to it on creation, as a result, the cron job does nothing when it runs (jobs older than 30 days are not being deleted).

Affected versions: 12.0, this was already fixed for 11.0 in #112

I've also added a test case and a migration to update the record for existing installations (since the record is marked as noupdate="1").

If, like me, you did not notice it for quite a while and now have hundreds of thousands of old jobs (or even more), running the fixed autovacuum cron job will most likely fail due to memory error or a timeout (depends on the setup, of course). To work around that, I've copied the original AutoVacuum Job Queue cron job record and used this for code:

deadline = datetime.datetime.now() - datetime.timedelta(days=31)
model.search([('date_done', '<=', deadline)], limit=10000).unlink()

and setup to run this Cron job e.g. every 5 minutes to clear away the build-up.