Issues:

1. There is no validation implementation for Mora link type against MusicBrainz entity type.
2. Only release (package) links are properly cleaned up.
3. Recording (track) links are cleaned up as release links making them invalid for recordings.

Impact as of 2026-01-02 for Mora links:

Total links: ~73 000
Total unnormalized artist and release links: ~500
Total incorrect artist links: ~50
Total incorrect recording links: ~150 (if my SQL is correct, all of them)

-- Get all Mora links associated with recordings
SELECT url.gid AS ugid, recording.gid AS rgid, recording.name, url FROM l_recording_url JOIN recording ON recording.id = entity0 JOIN url ON url.id = entity1 WHERE url LIKE 'https://mora.jp%' 

Valid artist link: https://mora.jp/artist/2024469/

Artist links that should be normalized/invalid but are not:

https://mora.jp/artist/2024469 - invalid link, returns resource not found

https://mora.jp/artist/2024469/all - unnormalized artist link, for artist releases subpage

https://mora.jp/artist/2024469/list - unnormalized artist link, for artist song listing subpage

https://mora.jp/artist/2091906/h - includes extra non-existent path segment

https://mora.jp/artist/1220246/all#discArea - includes query hash

https://mora.jp/artist/1804177/?sortColumn=1 - includes irrelevant query parameters

https://mora.jp/package/43000074/TCJPR0000522654_hires - not an artist link

Valid recording (track) link: https://mora.jp/package/43000011/4580789718663_HD/?trackMaterialNo=39831693

Track links that should be normalized/invalid but are not: 

https://mora.jp/package/43000011/4538182866573/?trackMaterialNo=15503332 - normalized into https://mora.jp/package/43000011/4538182866573/ which is a release, not a recording link