XF 1.3 Query to force Users to Unwatch?

The Dark Wizard

Well-known member
I used the automatic watch forum addon by @Chris D,

I did not realize that once 17000+ accounts started watching the same forum, that we would get fatal errors due to it running out of memory when a thread is posted since it can't send that many alerts.

Is there a query that I can use to to make it so that the forum is unwatched by members who haven't been on in a year for example.