Alright, I got the upgrade working pretty good.  One issue though:  After I add the genre table, update tracks to add the genre_id, and set the default "Unknown" genre on all the tracks, when I force a re-scan (through the UI), how do I force the indexer to scan files that haven't had their last-modified date changed?  My thought was to update the indexer rows and set every track to 0, but that seems like a hack.

If the indexer doesn't re-scan files that haven't changed, then their genres never update in the database to the tag values (in other words, the tracks just keep the "Unknown Genre" even thought the tag says something like "Jazz" or "Rock").

Thoughts?