Oops...batch edit mistake. D'oh!!!
Using Jamroom
Strumelia:
Ok I wanted to clear out like 147 Comments of the Comment Wall of a particular Group. I went into Batch Edit, under group comment count, and I changed the number from 147 to 0 for that group only, and hit 'update'.
This does not clear comments - this simply changed the "comment count" field to 0. Comments are stored on the User Comments module datastore.
I have no idea however WHY it appears to have deleted anything, since that batch edit is just going to do an UPDATE. My suspicion is that nothing was actually deleted, but somehow became "unlinked" in the DB. This is the first we've seen something like this, so hopefully we can replicate it here and get it fixed up.