whats the point though? mariadb is the best option for an mmo like l2, mariadb will never be the bottleneck of the gameserver even in theoretical online counts of 100k+
and its already implemented ...
the real bottleneck is the client itself, so extreme optimizations especially yours that are out of context make no sense
if your project is for educational purposes okay you can built it with nodejs its okay, but re-inventing the wheel with worst designs makes no sense, you can instead contribute to active real-world l2j projects instead and be useful to the community