Change frontend port to 3001 and fix REACT_APP_API_URL as build arg

REACT_APP_API_URL is baked into the JS bundle at build time, so it
must be passed as a build arg, not a runtime environment variable.
Port changed from 3000 to 3001 to avoid conflict with Gitea.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -1 +1,122 @@
-Welcome the only Portfolio you'll ever need
+# BTC Portfolio Tracker
+
+A full-stack Bitcoin portfolio tracker with live EUR pricing, purchase history, and interactive charts.
+
+---
+
+## Features
+
+- **Live BTC price** — fetched from CoinGecko in EUR
+- **Purchase tracking** — log BTC buys with amount (EUR) and price per BTC
+- **Portfolio stats** — total invested, current value, profit/loss
+- **Interactive charts** — portfolio value over time and 1-year BTC price history
+- **Edit & delete** — manage purchases with inline editing
+- **JWT authentication** — secure per-user portfolios
+
+---
+
+## Tech Stack
+
+| Layer    | Technology                          |
+|----------|-------------------------------------|
+| Frontend | React 18, Chart.js, dark theme      |
+| Backend  | FastAPI, SQLAlchemy, SQLite          |
+| Auth     | JWT (HS256, 24h expiry) + bcrypt    |
+| Pricing  | CoinGecko API (EUR)                 |
+| Deploy   | Docker + Docker Compose             |
+
+---
+
+## Getting Started
+
+### Docker (recommended)
+
+```bash
+git clone <repo-url>
+cd btc-portfolio
+docker-compose up
+```
+
+- Frontend: [http://localhost:3000](http://localhost:3000)
+- Backend API: [http://localhost:8000](http://localhost:8000)
+
+### Local Development
+
+**Backend**
+```bash
+cd btc-portfolio/backend
+pip install -r requirements.txt
+uvicorn app.main:app --reload
+```
+
+**Frontend**
+```bash
+cd btc-portfolio/frontend
+npm install
+npm start
+```
+
+---
+
+## Project Structure
+
+```
+btc-portfolio/
+├── backend/
+│   └── app/
+│       ├── main.py            # FastAPI app + CORS
+│       ├── models.py          # User & Purchase ORM models
+│       ├── auth.py            # JWT + bcrypt
+│       ├── dependencies.py    # Auth dependency injection
+│       ├── routes/
+│       │   ├── users.py       # POST /register, POST /login
+│       │   ├── purchases.py   # CRUD /purchases
+│       │   ├── stats.py       # GET /stats
+│       │   └── history.py     # GET /history (365-day BTC prices)
+│       └── services/
+│           └── btc.py         # CoinGecko integration
+└── frontend/
+    └── src/
+        ├── App.js             # Routing
+        ├── pages/
+        │   └── Dashboard.js   # Main view
+        └── components/
+            ├── AddPurchase.js      # Purchase form
+            ├── PurchaseList.js     # Purchase table (edit/delete)
+            ├── PortfolioChart.js   # Invested vs current value
+            └── BTCHistoryChart.js  # 1-year BTC price history
+```
+
+---
+
+## API Endpoints
+
+| Method | Endpoint          | Description                  | Auth |
+|--------|-------------------|------------------------------|------|
+| POST   | `/register`       | Create account               | No   |
+| POST   | `/login`          | Get JWT token                | No   |
+| GET    | `/purchases`      | List user purchases          | Yes  |
+| POST   | `/purchases`      | Add a purchase               | Yes  |
+| PUT    | `/purchases/{id}` | Edit a purchase              | Yes  |
+| DELETE | `/purchases/{id}` | Delete a purchase            | Yes  |
+| GET    | `/stats`          | Portfolio stats (P&L)        | Yes  |
+| GET    | `/history`        | 365-day BTC price history    | Yes  |
+
+---
+
+## Database
+
+SQLite, stored at `/app/data/btc_portfolio.db` (persisted via Docker volume).
+
+| Table       | Columns                                              |
+|-------------|------------------------------------------------------|
+| `users`     | id, username (unique), password (bcrypt hash)        |
+| `purchases` | id, amount_eur, price_eur, created_at, user_id (FK) |
+
+---
+
+## Notes
+
+- The `SECRET_KEY` in `auth.py` is hardcoded — use an environment variable in production.
+- CoinGecko requests are unauthenticated; failures return `0.0` gracefully.
+- CORS is restricted to `localhost:3000` by default.

btc-portfolio/docker-compose.yml

@@ -10,11 +10,12 @@ services:
     restart: unless-stopped
 
   frontend:
-    build: ./frontend
+    build:
+      context: ./frontend
+      args:
+        - REACT_APP_API_URL=http://localhost:8000
     ports:
-      - "3000:3000"
-    environment:
-      - REACT_APP_API_URL=http://localhost:8000
+      - "3001:3000"
     depends_on:
       - backend
     restart: unless-stopped