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Phase 6: Valkey availability mirror — move read path off Postgres
Mitra-availability state (online flag, deactivated flag, per-mitra session
count, heartbeat liveness) mirrored into Valkey so the customer beacon
+ pairing blast + dashboard counts no longer hit Postgres on the hot path.
Postgres remains the durable source of truth; Valkey state is fully
derivable via seedFromPostgres on startup + reconnect.
Schema
- mitras:online SET — mirror of is_online
- mitras:deactivated SET — mirror of is_active=false
- mitra:capacity:<id> STRING — active+pending_payment session count
- mitra💓<id> STRING — ISO timestamp of last ping
- availability:snapshot JSON — beacon cache, TTL 10s, cluster-shared
Write paths (Postgres first, best-effort Valkey)
- setOnline/setOffline mirror SADD/SREM + heartbeat SET/DEL
- updateMitraStatus mirrors mitras:deactivated AND revokes auth_sessions
on deactivate (bounds the "ghost online" window to access-token TTL)
- heartbeat is Valkey-only on the hot path; the per-ping Postgres UPDATE
on last_heartbeat_at is eliminated (was 1,200 ops/min at prod scale)
- chat_session lifecycle (accept/end/reroute/extension/expiry) calls
recomputeCapacityForMitra after each UPDATE — derive-from-truth avoids
the bookkeeping risk of per-transition INCR/DECR
Read paths (Valkey-first, Postgres fallback on Valkey error)
- isMitraReachable: SISMEMBER mitras:online + heartbeat freshness
- findAvailableMitras: SDIFF + pipelined GETs, filter by capacity + heartbeat
- countAvailableMitrasFromCache: Valkey-driven, cached cluster-wide 10s TTL
- dashboard online count: SCARD
- Each reader wraps Valkey ops in try/catch → Postgres fallback on outage
Heartbeat path on /api/mitra/status/heartbeat
- resolveMitra preHandler replaced with heartbeatGuard: SISMEMBER on
mitras:deactivated (~0 DB hits per ping). Falls back to full DB
resolveMitra if Valkey is unreachable so a Valkey outage doesn't
silently accept heartbeats from deactivated mitras.
Three sweeps, env-configurable cadences
- MITRA_AUTO_OFFLINE_SWEEP_SECONDS (30) — Valkey-driven stale detection
- HEARTBEAT_MIRROR_INTERVAL_SECONDS (60) — batched UPSERT writes
Valkey timestamps to Postgres last_heartbeat_at via UNNEST (1 statement
per cycle, idempotent across instances)
- VALKEY_ONLINE_MIRROR_SWEEP_SECONDS (300) — periodic reseed heals drift
Startup
- restoreActiveTimers → seedFromPostgres → bind listeners
- onValkeyReady re-runs the seed on every reconnect (cold start + reseed
on Valkey restart, no manual intervention)
Failure semantics
- Read fallback: every Valkey read wrapped, falls back to existing
Postgres JOIN query — system stays correct during Valkey outage,
performance degrades not breaks
- Write best-effort: Postgres write commits before Valkey is touched;
Valkey errors log + continue; reconciliation sweep heals drift
- Auto-offline sweep aborts entirely on Valkey error (does NOT mass-
offline via Postgres scan during Valkey hiccup)
Tests
- New: 32 integration tests in mitra-status.valkey-mirror.test.js
covering seed, write-through, fallbacks, capacity lifecycle,
auto-offline sweep, heartbeat mirror, deactivation flow, beacon cache
- Updated: fixtures.js seeds Valkey alongside Postgres when isOnline=true
- Updated: helpers/db.js resetDb also flushes test Valkey
- Fixed 2 pre-existing session-timer flakes (string IDs failed uuid
parse; vi.advanceTimersByTimeAsync raced real Postgres I/O)
- All 124/124 backend tests pass (was 90/92)
Docs
- requirement/valkey-online-mirror-plan.md — canonical plan
- requirement/valkey-online-mirror-testing.md — manual E2E checklist
- requirement/deployment.md — infra + Valkey persistence guidance for
prod (Memorystore Standard tier recommended; migration from
self-hosted Valkey is zero-downtime via reseed-from-Postgres)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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2026-05-25 18:07:55 +08:00 |
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Phase 4 Stage 1: backend foundation (additive endpoints + schema)
Schema (idempotent migration):
- payment_sessions.is_free_trial -> is_first_session_discount (data copied)
- payment_sessions.mode TEXT NOT NULL DEFAULT 'chat' CHECK (chat|call)
- chat_sessions.topics TEXT[] for ESP picks (info-only)
New endpoints:
- GET /api/client/onboarding-state (drives verif sheet + S6 paywall gate)
- GET /api/client/chat-pricing (rewrite: chat+call groups + first-session
discount block, per-customer eligibility)
- GET /api/shared/auth-providers (env-probed; replaces ENABLE_SOCIAL_AUTH
build flag — frontend cutover lands in stage 2)
- GET /api/client/support-handles (Tanya Admin handles, CC-config-driven)
session_warning WS event fires once at 180s remaining.
app_config seeds (mock pricing tiers, first-session discount, support
handles, payment method order, end-session 2-step toggle).
CC SettingsPage: 3 new sections (first-session discount, pricing tiers
JSON editors, support handles).
15/15 Vitest passing. chat_sessions.is_free_trial also renamed for
consistency (plan only specified payment_sessions; pairing.service.js
read both).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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2026-05-10 15:56:28 +08:00 |
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