Comment 1 for bug 2055493

If you're going to do the API call, I'd suggest simply having some way to get at collections of all gitsubscriptions/branchsubscriptions for a given user, which is an odd omission anyway and should be quite easy to implement. Then HR automation can have the job of figuring out which subscriptions should no longer exist.

I did find it weird that I lost access to e.g. lp:numark but was still receiving MP email about it, though, and that feels like a bug. So it would probably make sense to tackle this from both directions.