Heh. Well, #2, brilliant question. But no, I'm not thinking of anything as sexy as totally distributed filesystems. 15 years ago when I was into crypto and ran a bitcoin casino I would have had much bigger ideas for fully distributed DBs (which surely would have tanked and caused me ruin). Currently, I deal with a lot of site-specific software installations that run their own MySQL servers, some of which have unexpected downtime or go offline. I have a lot of custom code to align them with a master source of truth when they come back up. At least a few times a year, one of them gets so corrupted that I have to just login remotely and rebuild its database by hand. If I could have designed them to share a single database peer to peer, it would have saved me a lot of personal time.

There are probably a lot of hub-and-spoke systems like this flying way under the radar that would be a lot better if there were a reliable technology to keep them synchronized. I keep looking at Litestream and thinking about it.