v0.11.0 — SQLite persistence layer (SeismoDb)

sfm/database.py (new)
- SeismoDb class: three tables keyed by unit serial number
  - ach_sessions: one row per ACH call-home
  - events: one row per triggered event, deduped by (serial, waveform_key)
  - monitor_log: one row per monitoring interval, deduped by (serial, waveform_key)
- WAL mode, per-request connections, silent dedup via UNIQUE constraint
- Query helpers: query_events(), query_monitor_log(), get_sessions(), query_units()
- false_trigger flag on events for future review UI / report filtering

bridges/ach_server.py
- Import SeismoDb; create shared instance at startup pointed at
  bridges/captures/seismo_relay.db
- After each call-home: insert_events() + insert_monitor_log() + insert_ach_session()
- DB failures logged as warnings, never abort the session

sfm/server.py
- Import SeismoDb; lazy singleton via _get_db()
- New DB read endpoints: GET /db/units, /db/events, /db/monitor_log, /db/sessions
- PATCH /db/events/{id}/false_trigger for manual review flagging

CLAUDE.md / CHANGELOG.md
- Document DB schema, SFM DB endpoints, architecture decision (unit-keyed only)
- Version bump to v0.11.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -4,6 +4,44 @@ All notable changes to seismo-relay are documented here.
 
 ---
 
+## v0.11.0 — 2026-04-13
+
+### Added
+
+- **`sfm/database.py` — SeismoDb** — SQLite persistence layer for all ACH data.
+  Three tables, all unit-keyed by serial number:
+  - `ach_sessions` — one row per inbound call-home: serial, timestamp, peer IP,
+    events_downloaded, monitor_entries, duration_seconds
+  - `events` — one row per triggered waveform event: serial, waveform_key (dedup),
+    timestamp, Tran/Vert/Long/VectorSum/Mic PPV, project/client/operator/sensor_location
+    strings, sample_rate, record_type, false_trigger flag
+  - `monitor_log` — one row per monitoring interval: serial, waveform_key (dedup),
+    start_time, stop_time, duration_seconds, geo_threshold_ips
+  - WAL mode, per-request connections — safe for the single-writer / occasional-reader
+    ACH server pattern
+  - Deduplication by `(serial, waveform_key)` UNIQUE constraint — re-runs and repeat
+    call-homes never produce duplicate rows
+
+- **`ach_server.py` — DB integration** — after each successful call-home, writes new
+  events and monitor log entries to `seismo_relay.db` then records the session in
+  `ach_sessions`.  DB write failures are logged as warnings and do not abort the session.
+
+- **`sfm/server.py` — DB read endpoints**:
+  - `GET /db/units` — distinct serials with last_seen, total_events, total_monitor_entries
+  - `GET /db/events` — query events with serial / date range / false_trigger filters
+  - `GET /db/monitor_log` — query monitoring intervals
+  - `GET /db/sessions` — query ACH call-home sessions
+  - `PATCH /db/events/{id}/false_trigger` — flag/unflag false triggers (for review UI)
+
+### Architecture
+
+- seismo-relay DB is unit-keyed only — no project concepts.  Project aggregation is
+  terra-view's responsibility via `UnitAssignment` / `DeploymentRecord` + date range
+  queries against the SFM DB endpoints.
+- DB file lives at `bridges/captures/seismo_relay.db` by default.
+
+---
+
 ## v0.10.0 — 2026-04-11
 
 ### Added