you 9751141ffc feat: add observability metrics and concurrency tests ...

Observability:
- Add DBStats struct with atomic counters for tx_inserted, tx_dupes,
  obs_inserted, node_upserts, observer_upserts, write_errors
- Log SQLite config on startup (busy_timeout, max_open_conns, journal)
- Periodic stats logging every 5 minutes + final stats on shutdown
- Instrument all write paths with counter increments

Tests:
- TestConcurrentWrites: 20 goroutines × 50 writes (1000 total) with
  interleaved InsertTransmission + UpsertNode + UpsertObserver calls.
  Verifies zero errors and data integrity under concurrent load.
- TestDBStats: verifies counter accuracy for inserts, duplicates,
  upserts, and that LogStats does not panic

2026-03-28 16:36:50 +00:00

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ingestor

feat: add observability metrics and concurrency tests

2026-03-28 16:36:50 +00:00

server

perf: precompute distance analytics at ingest time, fixes #169

2026-03-27 22:54:03 -07:00