@icy it's difficult to reclaim space from. you have to run vacuum, but that requires approx double space. (it creates a whole new database). So it keeps growing and growing. It does have some advantages, but I think using the filesystem has some too.
Transition plan is we now store files in an attachments directory, but haven't written the code to extract everything from blob.db. So... it will hang around for a while, and maybe I'll write an optional command to convert. Or maybe support both backends. It's not terribly much code, and it's all been written in one form or another. Heh.