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Close the three FHIR R4 coding gaps in the health-record export. Both are export-layer only — no schema column, no migration, no contract change. Illness Conditions now carry a broad SNOMED CT category concept per IllnessType (infectious disease, allergy, injury, mental disorder, autoimmune disease, chronic disease, with the generic Disease root as the fallback for an unknown type) instead of the single generic placeholder. The user's own label stays on code.text, the class on category.text, and the unconfirmed + patient-reported guard rails are unchanged — the export still asserts no specific diagnosis. Lab Observations resolve a curated analyte to a real LOINC coding alongside the user's code.text for the common biomarkers (HbA1c, lipid panel, ferritin, TSH, vitamin D, creatinine, eGFR, ALT, AST, CRP, fasting glucose, hemoglobin), with analyte-key and EN/DE alias normalisation. The canonical UCUM code is stamped on the value only when the recorded unit matches the mapped canonical symbol; an unmapped analyte or a non-matching unit keeps the honest text-only code and display-only unit, never a fabricated code. The resolver takes an optional canonical-name argument so a future Biomarker-catalog link can take precedence over the free-text analyte without a further change here.
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.