Whats in /var/snap/maas/common/proxy/spool/ and can it be cleaned?

I have an installation of MaaS 3.4, where a single folder in the directory /var/snap/maas/common/proxy/spool/ takes up a lot of space (+35GB), in comparison to the rest of the folders in the dir - they take 1.1M each.
My best guess is that is some kind of caching of images/packages or similar that has never been cleansed.

Does anyone know what data is in that directory?
Is there a way to somehow safely do some “spring cleaning”?

It’s the directory where squid (the proxy) can store coredumps. You should be good to delete it. Reported as Bug #2056563 “Squid coredumps are filling the disk” : Bugs : MAAS