So a viewer sees recent trend on open instead of a blank chart. Viewing
only — reports still use the device's FTP .rnd data.
- NL43Reading table (auto-creates; no migration): unit_id, timestamp,
lp/leq/lmax/ln1/ln2.
- Monitor stores one downsampled reading per MONITOR_TRAIL_SAMPLE_S
(default 60s) from its keepalive poll loop, pruning rows older than
MONITOR_TRAIL_RETENTION_HOURS (default 24h). ~1440 rows/unit max.
- GET /api/nl43/{unit}/history?hours=N -> the trail for the last N hours
(clamped 0.1-48h), oldest-first.
Because keepalive runs 24/7, the trail fills continuously, so the history
is there whenever someone opens the live view.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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