Add full-stack BTC portfolio web app

Multi-user FastAPI + React app with JWT auth, SQLite storage, and
CoinGecko price integration. Dockerized with docker-compose.

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

btc-portfolio/backend/app/routes/purchases.py

@@ -0,0 +1,67 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+from typing import List
+from datetime import datetime
+
+from ..database import get_db
+from .. import models
+from ..dependencies import get_current_user
+
+router = APIRouter()
+
+
+class PurchaseCreate(BaseModel):
+    amount_eur: float
+    price_eur: float
+
+
+class PurchaseOut(BaseModel):
+    id: int
+    amount_eur: float
+    price_eur: float
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/purchases", response_model=List[PurchaseOut])
+def list_purchases(
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    return db.query(models.Purchase).filter(models.Purchase.user_id == current_user.id).all()
+
+
+@router.post("/purchases", response_model=PurchaseOut, status_code=status.HTTP_201_CREATED)
+def add_purchase(
+    purchase_in: PurchaseCreate,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    purchase = models.Purchase(
+        amount_eur=purchase_in.amount_eur,
+        price_eur=purchase_in.price_eur,
+        user_id=current_user.id,
+    )
+    db.add(purchase)
+    db.commit()
+    db.refresh(purchase)
+    return purchase
+
+
+@router.delete("/purchases/{purchase_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_purchase(
+    purchase_id: int,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    purchase = db.query(models.Purchase).filter(
+        models.Purchase.id == purchase_id,
+        models.Purchase.user_id == current_user.id,
+    ).first()
+    if not purchase:
+        raise HTTPException(status_code=404, detail="Purchase not found")
+    db.delete(purchase)
+    db.commit()

btc-portfolio/backend/app/routes/stats.py

@@ -0,0 +1,33 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from ..database import get_db
+from .. import models
+from ..dependencies import get_current_user
+from ..services.btc import get_btc_price_eur
+
+router = APIRouter()
+
+
+@router.get("/stats")
+def get_stats(
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    purchases = db.query(models.Purchase).filter(models.Purchase.user_id == current_user.id).all()
+
+    total_invested = sum(p.amount_eur for p in purchases)
+    total_btc = sum(p.amount_eur / p.price_eur for p in purchases) if purchases else 0.0
+    average_price = total_invested / total_btc if total_btc > 0 else 0.0
+    current_price = get_btc_price_eur()
+    portfolio_value = total_btc * current_price
+    profit_loss = portfolio_value - total_invested
+
+    return {
+        "total_invested": round(total_invested, 2),
+        "total_btc": round(total_btc, 8),
+        "average_price": round(average_price, 2),
+        "current_price": round(current_price, 2),
+        "portfolio_value": round(portfolio_value, 2),
+        "profit_loss": round(profit_loss, 2),
+    }

btc-portfolio/backend/app/routes/users.py

@@ -0,0 +1,42 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+
+from ..database import get_db
+from .. import models
+from ..auth import hash_password, verify_password, create_access_token
+
+router = APIRouter()
+
+
+class UserCreate(BaseModel):
+    username: str
+    password: str
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+@router.post("/register", status_code=status.HTTP_201_CREATED)
+def register(user_in: UserCreate, db: Session = Depends(get_db)):
+    existing = db.query(models.User).filter(models.User.username == user_in.username).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="Username already taken")
+    user = models.User(
+        username=user_in.username,
+        password=hash_password(user_in.password),
+    )
+    db.add(user)
+    db.commit()
+    return {"message": "User created"}
+
+
+@router.post("/login", response_model=Token)
+def login(user_in: UserCreate, db: Session = Depends(get_db)):
+    user = db.query(models.User).filter(models.User.username == user_in.username).first()
+    if not user or not verify_password(user_in.password, user.password):
+        raise HTTPException(status_code=401, detail="Invalid credentials")
+    token = create_access_token({"sub": user.username})
+    return {"access_token": token, "token_type": "bearer"}