Oh! RDB was the first database I worked with. I forgot all about it. I do remember refactoring the data layer so that it also worked with Berkeley DB, which is also owned by Oracle now. Or maybe it was the other way around? There was no SQL involved in that particular application so it was just a K/V store. Working with a local data file was the primary design goal, no client/server stuff was even on the radar. SQLite would have been perfect if it had existed.