I use syncthing for some backups, no idea why I've never considered it for keepass. Probably cause I don't want to mix the two and clients don't offer it already integrated. Or are there any? It for sure wouldn't make building the project more easy, and the password manager is the one thing i still want to build form source to at least imagine I have full control over it.

What about Resilio Sync? They have a discount for one-time license. And it was formerly BitTorrent Sync. I'll have to check out Sync Thing.

Well, SyncThing is open source as well as being free.