Decisions

neverthrow Result monads, Remeda, ts-pattern on NestJS — not full Effect-TS runtime.

Core API on ECS Fargate + Async Workers on Lambda+SQS. EventBridge deferred to Phase 3 (amended 2026-05-13).

AI/RAG out of v1 scope — future milestone. Only the outbox carries forward.

Role set, JWT claim shape, refresh-token rotation, B2B row scoping (RBAC baseline, ABAC later).

Phase-0 minimum ratified: shared-schema + company_id column. Authz/bulk-import/pricing deferred to pre-Phase-4.

Phase-0 minimum ratified: HA VPN, circuit breaker, baseline RPO/RTO. Retention/cross-region DR/PII anon deferred.

Only remaining hard Phase-0 blocker. Sizing vs on-prem headroom, flap behavior, TDS-aware circuit breaker.

CDK + SST on top, 3 stacks (shared + core-api + async-workers), Organizations multi-account.