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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+**Inspannings Monitor** — a Dutch-language wellness web app for energy planning, daily check-ins, reflection, and self-evaluation. UI and all user-facing text are in Dutch (nl-NL). Release 1 targets individuals only; no sharing, AI features, or medical claims.
+
+## Commands
+
+```bash
+npm run dev       # Start dev server (localhost:3000)
+npm run build     # Production build
+npm run lint      # ESLint
+```
+
+No test framework is configured yet.
+
+Node version: `20.9.0` (see `.nvmrc`).
+
+## Environment Setup
+
+Copy `.env.example` to `.env.local` and fill in your Supabase project values:
+
+```
+NEXT_PUBLIC_SUPABASE_URL=
+NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY=
+```
+
+Supabase project must have email/password auth enabled with email confirmation. Apply migrations from `supabase/migrations/` to your local/remote DB.
+
+## Architecture
+
+**Stack:** Next.js (App Router) + React 19 + TypeScript + Supabase (Auth + PostgreSQL) + shadcn/ui + Tailwind CSS. Deployed on Vercel.
+
+### Route structure
+
+| Route | Purpose |
+|---|---|
+| `/` | Public landing page |
+| `/login`, `/sign-up` | Auth pages |
+| `/auth/confirm` | Email confirmation callback |
+| `/onboarding` | Mandatory first-time setup |
+| `/dashboard` | Main protected page |
+| `/settings` | User preferences |
+
+### Auth & data flow
+
+- `lib/auth/` — `getAuthState()` validates the session server-side from SSR cookies. All protected routes call this and redirect unauthenticated users to `/login`.
+- New users are redirected to `/onboarding`; dashboard redirects there if onboarding is incomplete.
+- On first protected page load, `profiles` and `user_settings` rows are auto-created with defaults if missing.
+- Server Actions (`app/**/actions.ts`) handle form mutations; client components call these directly.
+
+### Database
+
+Two tables with Row Level Security (users see only their own rows):
+
+- **`profiles`** — display name, locale, timezone, onboarding completion flags
+- **`user_settings`** — reminder preferences, energy point visibility
+
+Migrations live in `supabase/migrations/`.
+
+### Key lib modules
+
+- `lib/supabase/` — Supabase client setup (server-side SSR client + proxy config)
+- `lib/auth/` — session helpers, navigation utilities, Dutch error messages
+- `lib/profile/service.ts` — CRUD for profiles and user_settings
+- `lib/profile/types.ts` — shared TypeScript types for profile/settings data
+- `lib/onboarding/` — onboarding options and timezone lists
+
+### UI components
+
+`components/ui/` contains shadcn/ui primitives (button, card, input, select, alert, etc.). Feature-level components live in `components/auth/`, `components/onboarding/`, and `components/settings/`. Path alias `@/*` resolves from the repo root.
+
+## CI/CD
+
+GitHub Actions (`.github/workflows/ci.yml`) runs lint + build on every PR and push to `main`. Vercel auto-deploys previews on branches and production on `main`. Production domain: `inspannings-monitor.jp-visser.nl`.
+
+## Planned next work
+
+From the backlog (tracked in Linear):
+- **ST-201** — Morning check-in feature
+- **ST-203** — Energy budget logic
+- **ST-301** — Activities data model