Hoi,
James, you assume a database but in reality it is not "setting an index" at
all. In essence this is NOT a relational database. Therefore it is NOT that
simplel.
Also the Wikidatification is a failure when it does not work for all
languages equally well. That is not to say that the results will be the
same; technically it should work equally well. That already is a big
challenge.
Denormalisation again has everything to do with relational databases.. So
in essence, you miss the point.
Thanks,
GerardM