Design it so that it can get that granular later(when someone else wants to do that work)

As long as it's got the capability it can grow into that later. Assuming unexpected and explosive popularity/growth it would be great if wikifoundation acquired it someday as a dataset if nothing else, but having a structure that can be expanded globally at a granular scale baked into it from the beginning would be awesome

Sorry I'm not great with computers or i would offer more of a technical opinion not just design commentary