[horde] IMP VFS tidy up - can ".horde/imp/compose" be safely removed if old?

[SPICY2 MIGRATION ACCOUNT]

Hi,

I've noticed the horde_vfs table in an IMP/HORDE instance I help manage
has grown quite large.

Almost all of the entries in this database have a "vfs_path" of
".horde/imp/compose".

It looks to me these are just temporary VFS entries used during message
composition and can safely be deleted if they are older than, say 3
months, is this correct?

I've been looking around and there does not seem to be a lot of info
how to manage the VFS.

There is a hint here
https://horde.horde.narkive.com/h1ekScTE/old-vfs-entries-delete
that "garbage collection" can be enabled but no mention of how this is
done, and I have searched the FAQ.

If this is more an IMP question I can post to the IMP list.

thanks!

Spicy2