remove empty track_id field and rename tmp_track_id to track_id #1
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RELEASE_TRACK_ARTIST has two columns TRACK_ID and TRACK_TMP_ID, TRACK_ID is always empty and TRACK_TMP_ID names gives the impression it has no value but is actually required to match track artist row to track in RELEASE_TRACK either via ID or TMP_ID as both have same value, so just drop TMP_ID