Yes you guys are right.. It's our history, we cannot delete it.
And indeed after all, 25Gb is not that much for a project on its way to dominate the world like FreeCAD
Yes, definitely the orphaned attachments could be removed, they are not accessible anyway...
Not sure about deleting the spammers, but maybe the "blacklist" contains only the names, I'll have a look
Also, I just changed the google catchpa back to some hand-made questions... Let's see if it works any better