No idea why it was originally going via the
addition endpoint but Shikimori's v1 and v2 APIs
have a dedicated endpoint to update a list entry
via PATCH or PUT (interchangeable, both allow
partial payloads).
Splitting off the update path revealed that
findLibManga would return a non-null track, which
in turn causes the update call to fail with a 404
due to `library_id` being null.
After further investigation, I realised that
findLibManga should always return null if the
title is not in the user's library, not just in
refreshes.
MajorTanya
0974e787ad