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Marc-André Bombeck
d8e4cf6000
Next 16.4 adopts a native history write a render later. A second write inside that gap was undone when the router adopted the first, and a write computed from useSearchParams started from the URL before the last one. Clearing the vault's filters could therefore leave ?encounter= behind: the debounced search wrote the filters it had rendered back over the clear. @/lib/url-state is now the one way a page writes its own query: each write starts from the live address bar, at most one waits for the router at a time, and later updates queue on top of it and go together once the router has it (or after a short grace). useUrlSearch reads the same live value and reports each adoption. The filter hook (documents, measurements, mood), the open document, the day layer, the timeline's zoom and range, the medication tabs, the AI provider choice, the Coach's ?c= and the one-shot parameter strips all go through it; the filter changes merge into the live filters. A guard refuses raw history writes and router writes built from the rendered params outside the helper. The timeline spec now waits for the values menu to hand focus back before scrolling to the last row; it measured mid-animation and the focus return scrolled the page back.
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.