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eatme/docs/architecture/overview.md
Michal Pemcak 94933cac5c Update OKF docs bundle, README, and CLAUDE.md for today's features
Documents the shift planning and closure/payroll modules (new tables,
routes, stores), the dark redesign, and the docker-compose-broken-host
workaround. Adds CLAUDE.md pointing agents at docs/. Translates README to
English and keeps host-specific infrastructure details out of the repo.
2026-08-16 18:41:11 +02:00

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---
type: Architecture Overview
title: System overview
description: How the EatMe frontend, backend, and database fit together.
tags: [architecture, backend, frontend]
timestamp: 2026-08-16T00:00:00Z
---
# System overview
EatMe is a small monorepo with two independently-runnable apps that ship as
one Docker image in production.
- **`backend/`** — Express + TypeScript API, SQLite via `better-sqlite3`
(entry point `backend/src/index.ts`). Owns all state: employee whitelist,
attendance events, shift planning, pay rates, month closures, and
payroll. Jest tests (`backend/src/services/*.test.ts`) cover the
service-layer workflows.
- **`frontend/`** — Vite + React + TypeScript PWA (entry point
`frontend/src/App.tsx`). Talks to the backend only over `/api/*`; in dev,
Vite proxies that path to `http://localhost:4000` (see
`frontend/vite.config.ts`).
## Request flow
1. Employee/admin signs in with Google Identity Services in the browser
(ID-token flow, no server-side OAuth redirect) — see
[Auth flow](./auth-flow.md).
2. The frontend POSTs the Google ID token to `POST /api/auth/google`; the
backend verifies it, issues its own JWT session cookie, and from then on
every `/api/*` call rides on that cookie (`credentials: 'include'` in
`frontend/src/api/client.ts`).
3. All app logic (fetching, polling, derived state) lives in Zustand stores
under `frontend/src/store/` — see [Frontend](/docs/frontend/index.md).
Components are thin consumers of store selectors/actions.
4. In production the backend also serves the built frontend as static files
(`dist/public/`, see [Deployment](./deployment.md)) — one process, one
container, one origin.
## Design language
Dark, sharp-edged (no border-radius) UI with a single warm amber accent
used sparingly (active tab, "this is mine" states) — not the colored
left/right accent-border pattern common in AI-generated designs. Started
as a light monochrome TUI style and was deliberately redesigned dark on
2026-08-16; see [Design system](/docs/frontend/design-system.md). All
tokens/component classes live in `frontend/src/styles/theme.css`.
## Related
- [Auth flow](./auth-flow.md)
- [Deployment](./deployment.md)
- [Data model](/docs/data-model/index.md)
- [API](/docs/api/index.md)