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RED commit: `27630f6a` — adds latency test that fails on master (p99=225ms > 50ms budget) and a stub `StartAnalyticsRecomputers` that returns a no-op so the assertion (not a build error) gates the change. GREEN commit: `20fbbceb` — wires real background recompute infrastructure. Test passes at p99=~1µs. ## What changed Replaces the on-request "compute-then-cache" pattern for the default-shape analytics queries with a steady-state background recompute loop. Reads always hit an `atomic.Value` snapshot in <1µs regardless of compute cost or writer contention. Operator principle: serving slightly stale data quickly beats real-time data slowly. ## Endpoints converted (default 5min interval each) | Endpoint | Cold compute | Recomputer interval | |---|---|---| | `/api/analytics/topology` | ~5s | 5 min | | `/api/analytics/rf` | ~4s | 5 min | | `/api/analytics/distance` | ~3s | 5 min | | `/api/analytics/channels` | ~0.5s | 5 min | | `/api/analytics/hash-collisions` | ~0.5s | 5 min | | `/api/analytics/hash-sizes` | ~22ms | 5 min | All intervals configurable per-endpoint via `analytics.recomputeIntervalSeconds.<name>` in `config.json`; documented in `config.example.json`. Default override via `analytics.defaultIntervalSeconds`. ## Scope: default query only Only the canonical shape `(region="", window=zero)` is precomputed. Region- or window-filtered requests fall back to the legacy TTL cache + on-request compute — keeps recomputer count bounded (6, not 6×N×M). ## Latency Test `TestAnalyticsRecomputerSteadyStateLatency`: 100 concurrent readers + 4 writers churning `s.mu.Lock` on 20k distHops. - Before: p50=188ms p99=225ms (assertion failed) - After: p50=240ns p99=1.1µs (atomic load + map return) ## Shutdown integration `StartAnalyticsRecomputers` returns a stop closure invoked from `main.go`'s SIGTERM handler BEFORE `dbClose()` so any in-flight SQLite compute drains cleanly. `TestAnalyticsRecomputerShutdownNoLeak` confirms all 6 goroutines are reaped (Δ=6 within 2s). ## Safety details - Initial compute is synchronous in `Start()` — first read after startup never sees nil. - `recover()` inside `runOnce` keeps a compute panic from killing the goroutine; previous snapshot remains valid. - `analyticsRecomputerMu` is a sync.RWMutex; recomputer pointers are read-locked in the hot path. The atomic.Value swap inside `runOnce` is lock-free. Fixes #1240. --------- Co-authored-by: OpenClaw Bot <bot@openclaw.local>