The implementation of the UK Covid-19 dashboard
I do wonder if the power of a distributed database is really needed here;
it gets ~1 update a day, so there's no need to have clever consistency stuff.
Most of the queries relate to either today's data (you open the map and zoom in to see how doomed your area is today), or the graphs showing a standard set of history (e.g. cases over the last year).
You'd think you could extract that data to be static and not require database queries, and only fire up the database for the tiny proportion that go digging in history.