The printer chart API was issuing one extra SELECT per row per field that the
serializer read but .only() omitted. nozzle_temp_left/nozzle_target_temp_left
were added to the serialization loop without being added to _METRICS_API_FIELDS,
so a single-day request ran 5,507 queries and took 34s; the UI's default 48h
range took 87s. Against a remote Postgres this is pure round-trip latency.
- Add the two left-nozzle fields to _METRICS_API_FIELDS.
- Always apply both time bounds in PrinterDataAPIView. Missing or partial date
params previously left the range open, so a bare API call scanned the whole
metrics table.
- Give PrinterDashboardView the same treatment the API already had: .only(),
sampling to _MAX_CHART_POINTS, and a targeted snapshot fetch. It also
evaluated its queryset twice, because .last() on an unevaluated queryset
issues its own query plus its own prefetch.
- Extract sample_metrics() and fetch_snapshots_by_metric() for reuse.
Printer shares the infrastructure_device table with a host project's other
devices and had no category field, so Printer.objects.filter(is_active=True)
could return a NAS. Add a category field and a category-scoped default manager,
keeping all_objects as the unfiltered base manager so related descriptors still
resolve every row. Migration 0009 creates the column in standalone deployments
and skips the DDL where the host project already owns it.
Measured: API 87s -> 0.67s, dashboard 3.4s -> 0.9s. Query counts are now
independent of row count, asserted by tests.
* Initial implementation of multi-printer support.
* Always show device dropdown and add bambu_diagnose for multi-printer troubleshooting.
* Add multi-AMS support: per-unit snapshot/usage tracking, grouped dashboard panels with real type labels, and dual-nozzle card UX fixes. Fixes a real-world AMS info-code parsing bug found by inspecting live H2C data.
* Add Vortek hotend rack tracking: per-SN registry with slot mapping confirmed against live MQTT capture, plus a fallback for non-inductive nozzles (e.g. H2C's fixed left nozzle) shown read-only without fabricated identity. New dashboard card hides entirely on printers with no Vortek/nozzle-info data at all.
