@jonas Just tried that. Db and backup are okay and not corrupted.
From what I've read/seen I think the issue wasn't corruption but just a bizarre mistimed save. I removed my primary music folder from the inclusion list so I could more easily compare other music folders in Strawberry, and after that was done I added it back. Bc it was added back it required a full rescan, so I cancelled the scan and enabled EBUR128 bc I might as well. In the playlists, removing the primary folder made every song disappear. At some point, maybe when I closed Strawberry prematurely or whatever, Strawberry saved the playlists to the DB, and since the missing tracks were still not in the database, saved blank entries into all the data cells, wiping any data. Or it happened some other bizarre way IDK.
TLDR (most of) the data was overwritten with empty tags because of a weird niche save mechanic.
So unless someone really involved in Strawberrys development knows how to use the collection_id data to reverse engineer the individual tracks the data is completely lost. C'est la vie.