`mode=ro&immutable=1` claims the file never changes, so sqlite skips the
write-ahead log entirely: every row the server has committed but not yet
checkpointed reads as MISSING, and a read beside a running scanner can fail
outright as "database disk image is malformed". Both servers keep their
libraries in WAL, so plain `mode=ro` is now the first door and `immutable=1`
only the fallback for a database whose `-shm` cannot be read.
The verdict also stopped guessing from the database alone. A file still at its
`src` is REAL (this pass's own damage); a file at neither path is `gone` (a
later pass or the server renamed it); a file sitting at `dst` with no row
naming it is something the server does not index. A row that still names `src`
is none of those — it is the server's stale pointer, and it costs a re-scan,
never a restore.
A scan answers 204 whether or not it found anything, so the fleet's documented
proof — every move row has a row at its dst and zero rows still name its src —
was a hand-written sqlite query every time anyone needed it. That is the step a
half-finished relayout is judged on, so it is now a command with an exit code.
It encodes the two doors that bite: Jellyfin stores the container-side path
(/data stands for the share) while Plex stores the host path verbatim and hides
deleted scans behind deleted_at on two tables. The report breaks the missing rows
down by extension, because a .cue or .log has no row to land in and must not read
as a lost album; --ignore-ext keeps those out of the verdict.
Frank
dank