The edit dialog offered a printer picker and target-model dropdown for
an item with alternatives. Saving left a row with variants AND a
printer_id, and the scheduler's fixed-printer branch wins that race, so
it dispatched a row whose library_file_id is still null and failed in
the upload. PATCH now refuses printer/model changes on such an item —
comparing against the current value, since the dialog re-sends
target_model unchanged — and the route eager-loads variants, without
which the guard could not see them and every PATCH response dropped the
alternatives from its payload.
Names come from a shared helper now. A cross-model item holds neither
archive_id nor library_file_id until dispatch, so five separate inlined
fallbacks all rendered "File #null"; they now read "x1c.gcode.3mf +1
more".
The queue also grouped these under "Any H2D" — the first candidate
mirrored onto the row — filing a job under a printer it might never run
on. It groups as "Any H2D / X1C", matching the row beneath it.
Adds /library/variant-groups for declaring that several sliced files are
the same job for different printers, and a variants payload on queue
creation that turns such a set into one queue item with a candidate per
file.
The candidate set is validated as a set: one file per printer model, each
file sliced for the model it is offered as, and at least one model with
an active printer. A cross-model item deliberately holds no file of its
own, because print_queue.library_file_id is ON DELETE CASCADE and would
destroy the whole job when a single alternative is deleted.
Fixes internal printer-model codes never being resolved on queue create
and update: normalize_printer_model returns unknown input unchanged, so
the or-chain never reached the code map and a "C13" target matched no
printer and waited forever.
Skips candidates whose file is trashed or missing. Library deletes are
soft, and SQLite runs with PRAGMA foreign_keys off, so neither case is
covered by the schema; the hard-delete paths now also drop the rows.
Adds library_files.variant_target_model so a user can say which printer
a file without slicer metadata is for, kept out of file_metadata so the
assertion is never mistaken for parsed data.
maziggy