When querying for an existing track, matching should be done on all relevant fields (artist_id, release_id, title, version, track_num, disc_num)

[Chris Wagner]

The problem is that if, for example, we have a previous entry that had an incorrect or no track_num present, but the file being processed now does have track-number information available, the database entry would not get updated appropriately.

Trying to actually update entries could lead to tricky situations where we might have one version of a release tagged incorrectly, conflicting with another version that is tagged appropriately. Rather than try to work out these situations, it would be better to simply have multiple entries in the 'tracks' table, cleaning out any unused ones at some point.

[Chris Wagner (chris-wagner)]

Addressed in revision 719.