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Marc-André Bombeck
15b5f6f92f
The dedup key on the medication intake surfaces is not only `externalId`. `MedicationIntakeEvent.idempotency_key` is a `@unique` column persisted with the dose row forever, with no TTL and no sweep, matched by plain equality on the per-medication POST, the bulk drain and the external ingest bridge. That makes it an identity, not a replay token, and it carries the same failure mode: a key that rotates per client launch never matches its own earlier post, so every retry logs the dose again. The blank case is sharper still — the column is unique table-wide, so an empty key resolves to whichever unrelated row stored it first. Refuse both shapes at the schema on the single-entry paths and per entry on the bulk drain. The MCP write path hashes a host-supplied key into the `externalId` half of its dedup key, so the shape is laundered before anything downstream could see it and the check has to run on the input. That closes a live one: every tool handler falls back to `""` when the host omits the argument, and `""` digests to a constant, so each keyless write after the first reported `already_logged` and was silently dropped. The HTTP `Idempotency-Key` header stays out, and now says why in the guard: `IdempotencyKey.expiresAt` bounds it and the cleanup job sweeps it, so it is a windowed replay token and rotation is its design. Extend the structural guard with a provenance rule for identities that never pass a Zod request schema — a spreadsheet column, an MCP tool argument. Inside the import and MCP trees, a module handling an identity must apply the floor itself or import a module that does. That is a real chain rather than a list of known offenders: a new importer that mints an `externalId` from file input and imports nothing checked fails it, with no allowlist to escape into.
src/
Application source. HealthLog is a Next.js 16 App Router project (output: "standalone", React 19, TypeScript strict). The path alias @/* resolves to this directory. Everything a request touches lives under here; the layout below follows the request flow rather than alphabetical order.
Request flow
client → src/proxy.ts → src/app/<route>/route.ts → src/lib/api-handler.ts → handler body → src/lib/api-response.ts → client
proxy.ts— the HTTP edge (Next.js 16's renamedmiddleware). Public-path allowlist, demo-mode mutation block, server-side onboarding redirect, worker-only refusal,x-request-id+ CSP nonce generation, every security header.app/— App Router pages (RSC by default) and API routes. Every API route wraps its handler inapiHandler. Seeapp/README.md.lib/— the server/runtime toolkit:apiHandler, auth, crypto, rollups, AI, notifications, pg-boss jobs, integrations, rate limiting. Seelib/README.md.components/— React components (shadcn/ui new-york, kebab-case files). Seecomponents/README.md.
Other directories
hooks/— shared React hooks (use-prefix, kebab-case).types/— shared TypeScript declarations.generated/prisma/— the generated Prisma client (do not edit; regenerated byprisma generate). Imported as@/generated/prisma.instrumentation.ts— Next.js startup hook; boots the pg-boss worker registry and boot-time backfill queues.__tests__/— cross-cutting unit tests; most tests live in__tests__/folders next to the code they cover.
Conventions
See ../CLAUDE.md for the full set. The load-bearing ones: RSC by default ("use client" only when a hook/state/browser API needs it); every API route wraps apiHandler and parses its body with Zod safeParse; userId is always narrowed from session or Bearer, never accepted as a body field; TanStack Query keys come only from src/lib/query-keys/; outbound HTTP goes through src/lib/safe-fetch.ts.