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docs: changelog [Unreleased] — SLM live monitoring (fan-out feed + cache-first reads)

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Captures the whole feat/slm-live-monitor effort (12 commits): fan-out /monitor
feed consumption, L1/L10 chart lines, live-chart backfill, cache-populated live
panel with measuring/freshness, per-unit + panel refresh, admin keepalive toggle,
dashboard/command-center cache reads, and the dispatchEvent/CancelledError/
freshness fixes. Targets 0.14.0; Upgrade Notes flag the paired SLMM `dev` build +
its migrations.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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2026-06-10 20:17:10 +00:00
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@@ -5,6 +5,50 @@ All notable changes to Terra-View will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
SLM live monitoring — fan-out feed + cache-first reads. Targets **0.14.0**. The throughline: the NL-43 allows exactly **one** TCP connection at a time, so every page that opened its own device stream (or sent its own `Measure?`/DOD on load) was competing for that single connection — a second viewer saw nothing, and dashboard loads stole polling resolution from the live feed. This release moves Terra-View entirely onto SLMM's shared, cached monitoring: one DOD poll loop per device, fanned out to all viewers; dashboards read SLMM's cache (a DB read on SLMM's side) instead of touching the device; and the live panels populate instantly from cache on open, upgrading to the live WS only on demand. Paired with the SLMM-side work (adaptive poll rate, unreachable backoff, device-offline alert) on SLMM branch `dev`.
### Added
- **Fan-out `/monitor` feed consumption.** The unit live view (`partials/slm_live_view.html`) and the dashboard live tile (`sound_level_meters.html`) now subscribe to SLMM's shared per-device monitor over `WS /api/slmm/{unit}/monitor` instead of each opening its own device stream. Any number of clients attach without each consuming the NL-43's single connection — the "second viewer sees nothing" contention is gone. A WS proxy handler for `/monitor` was added to `backend/routers/slmm.py`.
- **L1/L10 percentile lines + cards.** Both the per-unit live chart and the dashboard card chart now plot L1 (purple) and L10 (orange) alongside Lp/Leq, and the KPI cards show L1/L10. Sourced from the DOD feed's `ln1`/`ln2` (DRD streaming can't carry percentiles, DOD can). Missing/`-.-` values leave a gap rather than dropping the line to 0.
- **Live-chart backfill on open.** Charts seed from SLMM's downsampled DOD trail (`GET /api/slmm/{unit}/history?hours=2`) so a viewer sees recent trend immediately instead of a blank chart that fills one point per second.
- **Live Measurements panel auto-populates from cache.** Opening the dashboard panel fills the KPI cards from cached `/status` and backfills the chart from `/history` — pure cache reads, no device hit. Shows a measuring badge (● Measuring / ■ Stopped) and a freshness stamp ("as of 3:48 PM (10s ago)", amber + "cached" when stale). Re-polls the cache every 15s while open; **Start Live Stream** upgrades to the live WS and no longer wipes the backfilled trail (chart point cap raised 60 → 600).
- **Refresh buttons** — one per device-list row, one in the panel header. On-demand, user-initiated single device read via `GET /api/slmm/{unit}/live` (which also refreshes SLMM's cache), with a spinner + success/error toast, then reloads the device list.
- **Per-unit live-monitoring (keepalive) toggle on `/admin/slmm`** — turns a device's server-side keepalive feed on/off (`POST /monitor/start|stop`), so alerting can keep a device's feed running with no browser attached.
### Changed
- **Dashboard device list + command center read SLMM's cache, not the device.** `slm_dashboard.py`'s `get_slm_units` pulls each unit's cached status from SLMM's `/roster` (one call, a SLMM DB read) for the badge + freshness; the command-center `get_live_view` reads cached `/status` instead of sending `Measure?` + a fresh DOD on every load. This stops dashboard loads from stealing the device's single connection from the live monitor. The elapsed-measurement timer still works because `measurement_start_time` is now included in the cached `/status` response.
- **Device-list freshness reflects real monitoring.** The "Last check" line now uses SLMM's cached `last_seen` (which the monitor advances on every successful poll) via `unit.cache_last_seen`, instead of the `slm_last_check` roster field the monitor never updates. The status badge also treats `Measure` as Measuring, matching the panel and SLMM's cache.
- **Status badge relocated** to the card's bottom meta row (next to "Last check"), off the top-right corner where it collided with the chart/gear/refresh action icons.
### Fixed
- **Deploy/bench threw `can't access property "dispatchEvent", e is null`.** `toggleSLMDeployed()` and the save-config path called `htmx.trigger('#slm-list', 'load')` guarded only by `typeof htmx !== 'undefined'`; no page has a `#slm-list`, so htmx resolved null and called `null.dispatchEvent(...)`. The deploy POST had already succeeded, so the operator saw both the green success **and** a red error. Both call sites now guard on the element existing (`slm_settings_modal.html`).
- **Monitor WS proxy leaked `CancelledError` / "task exception never retrieved"** on stream stop — the cleanup awaited pending tasks but only caught `Exception`, missing `CancelledError` (a `BaseException`).
- **"No recent check-in" shown even on an actively-monitored device** — the row read the stale `slm_last_check` roster field instead of SLMM's live cache (see Changed).
- **L1/L10 KPI cards populated but the chart drew no L1/L10 lines** — the card chart only had Lp + Leq datasets.
### Upgrade Notes
Requires the **matching SLMM build (branch `dev`)** — Terra-View now depends on SLMM's fan-out `/monitor` feed, `/history` trail, `/status` carrying `ln1`/`ln2` + `measurement_start_time`, cached `/roster` status, and the `monitor_enabled` keepalive flag.
```bash
# SLMM (branch dev) — REBUILD + MIGRATE (or you'll get `no such column: nl43_status.ln1` 500s)
cd /home/serversdown/slmm && docker compose build slmm && docker compose up -d slmm
docker exec terra-view-slmm-1 python3 migrate_add_ln_percentiles.py
docker exec terra-view-slmm-1 python3 migrate_add_monitor_enabled.py
# Terra-View — NO migration; templates are baked into the image, so rebuild (don't just restart)
cd /home/serversdown/terra-view && docker compose build terra-view && docker compose up -d terra-view
```
The two builds must ship **together**. Note the `docker-compose.yml` container was renamed for clarity (now `terra-view-terra-view-1`) — adjust any `docker exec` scripts that referenced the old name.
---
## [0.13.3] - 2026-06-05
Calibration sync from SFM events. Closes the manual data-entry loop on calibration dates — Terra-View now pulls `device.calibration_date` from each seismograph's most recent event sidecar once a day and updates `RosterUnit.last_calibrated` when the device reports something fresher than what's stored. Manual edits still win when they're newer than the latest event; a fresh event arriving later supersedes the manual edit. Adds a "Sync now" button under Settings → Advanced → Calibration Defaults for on-demand runs, and a `docs/ROADMAP.md` to track in-flight + deferred work.