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Adds AuditLog.actorUserId (migration 0294) and threads it centrally, out of the wide-event context the acting-account resolver already stamps. No call site passes an actor, so no route can forget one. NULL keeps meaning "acted for themselves" — the reading every existing row carries. The threading fills the column only when a request resolved an acting account AND the row is being filed under that account, so a self-action, a refusal, and a delegate's row about themselves all stay NULL rather than acquiring an id that would rewrite what the history says. Delegated reads coalesce to one row per owner, delegate and day, through a partial unique index and an insert that expects to lose the race. The alternative is a row per request on the busiest table in the schema and an activity view made of identical lines. The column carries no foreign key, against the grain of user_id beside it: SET NULL there erases an account from its own history, while here it would turn "the delegate opened this record" into "the owner opened this record". An id that no longer resolves reads as a deleted account; an id that silently became NULL reads as a lie.
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.