Sure, but there are other password managers with this same problem. I'm suggesting something more like the tz database - a common, authoritative source of truth

Sure, but there are other password managers with this same problem. I'm suggesting something more like the tz database - a common, authoritative source of truth for any password generator / database app to use. Just like the tz database, it would require some maintenance, but I think it would be worthwhile (yes, I would volunteer to maintain it, if others were to volunteer to add support for same in the various keepass implementations I use).