Measured 2026-11-02 against the live server. The per-library posture goes on the
page because two libraries are silent file indexes right now: Shows and Music
carry EnableInternetProviders=false, so a refresh on either answers 204 and
stores nothing — any metadata or artwork work there starts by flipping the
switch, not by scanning. Movies additionally has EnableRealtimeMonitor=false, so
a folder moved into /data/Movies stays invisible until a recursive refresh names
it; "Jellyfin does not see the file" is the designed answer, not a fault.
Recorded with it: the option door on 12.x is POST
/Library/VirtualFolders/LibraryOptions (GET answers 405 — that is how the route
is found) while the 10.x /Update and /Refresh routes answer 404 outright, and
the VirtualFolders DTO is PascalCase, so a census written against the old
camelCase keys reads None and misreports a healthy library as unconfigured.
A library record can also be a phantom: a 2026-11-01 capture carried Shows2,
Shows3 and Music2 with empty Locations while only four libraries existed, so the
live set is the entries with non-empty Locations and never the record count.
Frank
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