Phase 1 of the SFM project/location integration. When viewing a vibration
monitoring location, operators now see the events that were actually
recorded there — fanned out across every seismograph that was ever
assigned to that location (handles mid-project unit swaps).
Backend:
- backend/services/sfm_events.py: new events_for_location() async helper.
Walks UnitAssignment rows for the location (active + closed), intersects
each assignment's [assigned_at, assigned_until] window with the requested
filter, and concurrently queries SFM /db/events for each (serial, window)
pair via httpx.AsyncClient. Unions, sorts newest-first, computes summary
stats (event count, peak PVS + when/who, last event, false-trigger count)
over the full set, and trims to the user's display limit. Over-fetches
per-window (up to 5000) so stats stay accurate even with a small display
limit.
- backend/routers/project_locations.py: new GET endpoint
/api/projects/{project_id}/locations/{location_id}/events. Validates
project/location pairing (404 on mismatch). SLM locations return an
empty payload rather than 404 so the frontend can render gracefully.
Frontend:
- templates/vibration_location_detail.html: new "Events" tab on the
location detail page. KPI tiles (total / peak PVS / last event / false
triggers), "Seismographs deployed at this location" assignment list
(transparency: shows each assignment's date range and contributed event
count), date / false-trigger / limit filters, and the paginated event
table. Lazy-loaded on first tab visit; manual refresh button.
Architectural notes:
- SFM remains the single source of truth for events. No event sync; live
HTTP per page load.
- UnitAssignment is the join key (not MonitoringSession).
- Events whose timestamp falls outside every assignment window are NOT
surfaced here. Those orphan events get a dedicated "Unattributed
events" view on the per-unit detail page in Phase 2.
Out of scope (this commit):
- Phase 2 (per-unit history view) and Phase 3 (project-level roll-up)
reuse this helper but ship separately.
- Phase 4 (deprecating deployment_records) is independent.
- Extracting the event-table JS to a shared file is a follow-up.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
