Merge branch 'development'

- Refresh candles on every /candles request instead of only at startup
- Patch today's candle close/high/low with the live BTC price intraday
- Synthesise today's candle from live price if CoinGecko hasn't published it yet
- Display current BTC price next to the chart title

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

.gitignore

@@ -0,0 +1,2 @@
+# Local wallet scripts with credentials — never commit
+btc_wallet.py

README.md

@@ -1,29 +1,32 @@
 # BTC Portfolio Tracker
 
-A full-stack Bitcoin portfolio tracker with live EUR pricing, purchase history, and interactive charts.
+A full-stack Bitcoin portfolio tracker with live EUR pricing, purchase/sell history, candlestick charts, and price predictions.
 
 ---
 
 ## 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
+- **Live BTC price** — fetched from CoinGecko in EUR, with cached fallback and stale warning
+- **Purchase tracking** — log BTC buys with amount (EUR), price per BTC, and a custom date
+- **Sell tracking** — log BTC sells with BTC amount, price per BTC, and a custom date
+- **Portfolio stats** — total invested, current value, profit/loss, net BTC held
+- **Price prediction** — enter a target BTC price to see projected portfolio value and P&L
+- **Interactive charts** — portfolio value over time and BTC candlestick chart (OHLC stored locally)
+- **Edit & delete** — inline editing and deletion for both purchases and sells
+- **Admin panel** — admin users can create, list, and delete accounts
 - **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             |
+| 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 + nginx         |
 
 ---
 
@@ -65,42 +68,55 @@ btc-portfolio/
 ├── backend/
 │   └── app/
 │       ├── main.py            # FastAPI app + CORS
-│       ├── models.py          # User & Purchase ORM models
+│       ├── models.py          # User, Purchase, Sell, OHLCCandle ORM models
 │       ├── auth.py            # JWT + bcrypt
 │       ├── dependencies.py    # Auth dependency injection
 │       ├── routes/
 │       │   ├── users.py       # POST /register, POST /login
 │       │   ├── purchases.py   # CRUD /purchases
+│       │   ├── sells.py       # CRUD /sells
 │       │   ├── stats.py       # GET /stats
-│       │   └── history.py     # GET /history (365-day BTC prices)
+│       │   ├── history.py     # GET /history (365-day BTC prices)
+│       │   ├── candles.py     # GET /candles (OHLC data + purchases overlay)
+│       │   └── admin.py       # GET/POST/DELETE /admin/users
 │       └── services/
 │           └── btc.py         # CoinGecko integration
 └── frontend/
     └── src/
         ├── App.js             # Routing
         ├── pages/
-        │   └── Dashboard.js   # Main view
+        │   └── Dashboard.js   # Main view: stats, predictions, charts, tables
         └── components/
-            ├── AddPurchase.js      # Purchase form
-            ├── PurchaseList.js     # Purchase table (edit/delete)
-            ├── PortfolioChart.js   # Invested vs current value
-            └── BTCHistoryChart.js  # 1-year BTC price history
+            ├── AddPurchase.js        # Purchase form (amount EUR, price, date)
+            ├── PurchaseList.js       # Purchase table (inline edit/delete)
+            ├── AddSell.js            # Sell form (BTC amount, price, date)
+            ├── SellList.js           # Sell table (inline edit/delete)
+            ├── PortfolioChart.js     # Invested vs current value over time
+            └── BTCCandlestickChart.js # OHLC candlestick chart with purchase markers
 ```
 
 ---
 
 ## 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  |
+| 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    | `/sells`               | List user sells                    | Yes   |
+| POST   | `/sells`               | Add a sell                         | Yes   |
+| PUT    | `/sells/{sell_id}`     | Edit a sell                        | Yes   |
+| DELETE | `/sells/{sell_id}`     | Delete a sell                      | Yes   |
+| GET    | `/stats`               | Portfolio stats (P&L, net BTC)     | Yes   |
+| GET    | `/history`             | 365-day BTC price history          | Yes   |
+| GET    | `/candles`             | OHLC candles + purchase overlay    | Yes   |
+| GET    | `/admin/users`         | List all users (admin only)        | Admin |
+| POST   | `/admin/users`         | Create a user (admin only)         | Admin |
+| DELETE | `/admin/users/{id}`    | Delete a user (admin only)         | Admin |
 
 ---
 
@@ -108,15 +124,19 @@ btc-portfolio/
 
 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) |
+| Table          | Columns                                                       |
+|----------------|---------------------------------------------------------------|
+| `users`        | id, username (unique), password (bcrypt hash), is_admin       |
+| `purchases`    | id, amount_eur, price_eur, created_at, user_id (FK)          |
+| `sells`        | id, btc_amount, price_eur, created_at, user_id (FK)          |
+| `ohlc_candles` | id, date (unique, YYYY-MM-DD), open, high, low, close        |
 
 ---
 
 ## Notes
 
 - The `SECRET_KEY` in `auth.py` is hardcoded — use an environment variable in production.
-- CoinGecko requests are unauthenticated; failures return `0.0` gracefully.
+- CoinGecko requests are unauthenticated; failures fall back to the last cached price with a UI warning.
+- OHLC candle data is fetched from CoinGecko and stored locally to reduce API calls.
 - CORS is restricted to `localhost:3000` by default.
+- The frontend is served via nginx in the Docker production setup.

btc-portfolio/backend/.dockerignore

@@ -0,0 +1,7 @@
+.git
+__pycache__
+*.pyc
+*.pyo
+.env
+*.egg-info
+.pytest_cache

btc-portfolio/backend/app/auth.py

@@ -1,8 +1,9 @@
+import os
 from datetime import datetime, timedelta
 from jose import JWTError, jwt
 from passlib.context import CryptContext
 
-SECRET_KEY = "change-me-in-production-use-a-long-random-string"
+SECRET_KEY = os.environ.get("SECRET_KEY", "dev-insecure-key-change-me")
 ALGORITHM = "HS256"
 ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24  # 1 day
 

btc-portfolio/backend/app/main.py

@@ -1,20 +1,28 @@
+import os
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from sqlalchemy import text
 
 from .database import engine, Base, SessionLocal
-from .routes import users, purchases, stats, history, admin, candles
+from .routes import users, purchases, stats, history, admin, candles, sells
 
 Base.metadata.create_all(bind=engine)
 
 app = FastAPI(title="BTC Portfolio API")
 
+_raw_origins = os.environ.get(
+    "ALLOWED_ORIGINS",
+    "http://localhost:3000,http://localhost:3001",
+)
+allowed_origins = [o.strip() for o in _raw_origins.split(",") if o.strip()]
+
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["http://localhost:3000", "http://localhost:3001"],
+    allow_origins=allowed_origins,
     allow_credentials=True,
-    allow_methods=["*"],
-    allow_headers=["*"],
+    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
+    allow_headers=["Content-Type", "Authorization"],
 )
 
 app.include_router(users.router)
@@ -23,6 +31,7 @@ app.include_router(stats.router)
 app.include_router(history.router)
 app.include_router(admin.router, prefix="/admin")
 app.include_router(candles.router)
+app.include_router(sells.router)
 
 
 @app.on_event("startup")

btc-portfolio/backend/app/models.py

@@ -13,6 +13,7 @@ class User(Base):
     is_admin = Column(Boolean, default=False, nullable=False, server_default='0')
 
     purchases = relationship("Purchase", back_populates="owner", cascade="all, delete")
+    sells = relationship("Sell", back_populates="owner", cascade="all, delete")
 
 
 class Purchase(Base):
@@ -27,6 +28,18 @@ class Purchase(Base):
     owner = relationship("User", back_populates="purchases")
 
 
+class Sell(Base):
+    __tablename__ = "sells"
+
+    id = Column(Integer, primary_key=True, index=True)
+    btc_amount = Column(Float, nullable=False)
+    price_eur = Column(Float, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+
+    owner = relationship("User", back_populates="sells")
+
+
 class OHLCCandle(Base):
     __tablename__ = "ohlc_candles"
 

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

@@ -1,9 +1,12 @@
 from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
+from datetime import datetime, timezone
 
 from ..database import get_db
 from .. import models
 from ..dependencies import get_current_user
+from ..services.candles import refresh_latest_candles
+from ..services.btc import get_btc_price_eur
 
 router = APIRouter()
 
@@ -14,6 +17,9 @@ def get_candles(
     db: Session = Depends(get_db),
     current_user: models.User = Depends(get_current_user),
 ):
+    # Refresh candles on every request (no-op if DB is already current)
+    refresh_latest_candles(db)
+
     query = db.query(models.OHLCCandle).order_by(models.OHLCCandle.date.asc())
 
     if days != "all":
@@ -38,6 +44,26 @@ def get_candles(
         for c in candles_db
     ]
 
+    # Patch today's candle with the live price so it tracks intraday movement
+    today = datetime.now(tz=timezone.utc).strftime("%Y-%m-%d")
+    live_price, _ = get_btc_price_eur()
+    if live_price and candles:
+        last = candles[-1]
+        if last["date"] == today:
+            last["close"] = round(live_price, 2)
+            last["high"] = round(max(last["high"], live_price), 2)
+            last["low"] = round(min(last["low"], live_price), 2)
+        elif last["date"] < today:
+            # No candle for today yet — create a synthetic one from live price
+            prev_close = last["close"]
+            candles.append({
+                "date": today,
+                "open": prev_close,
+                "high": round(max(prev_close, live_price), 2),
+                "low": round(min(prev_close, live_price), 2),
+                "close": round(live_price, 2),
+            })
+
     purchases_db = db.query(models.Purchase).filter(
         models.Purchase.user_id == current_user.id
     ).all()

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

@@ -1,7 +1,7 @@
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.orm import Session
-from pydantic import BaseModel
-from typing import List
+from pydantic import BaseModel, Field
+from typing import List, Optional
 from datetime import datetime
 
 from ..database import get_db
@@ -12,13 +12,14 @@ router = APIRouter()
 
 
 class PurchaseCreate(BaseModel):
-    amount_eur: float
-    price_eur: float
+    amount_eur: float = Field(gt=0, le=10_000_000)
+    price_eur: float = Field(gt=0, le=10_000_000)
+    created_at: Optional[datetime] = None
 
 
 class PurchaseUpdate(BaseModel):
-    amount_eur: float
-    price_eur: float
+    amount_eur: float = Field(gt=0, le=10_000_000)
+    price_eur: float = Field(gt=0, le=10_000_000)
     created_at: datetime
 
 
@@ -54,6 +55,7 @@ def add_purchase(
     purchase = models.Purchase(
         amount_eur=purchase_in.amount_eur,
         price_eur=purchase_in.price_eur,
+        created_at=purchase_in.created_at or datetime.utcnow(),
         user_id=current_user.id,
     )
     db.add(purchase)

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

@@ -0,0 +1,101 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from pydantic import BaseModel, Field
+from typing import List, Optional
+from datetime import datetime
+
+from ..database import get_db
+from .. import models
+from ..dependencies import get_current_user
+
+router = APIRouter()
+
+
+class SellCreate(BaseModel):
+    btc_amount: float = Field(gt=0, le=21_000_000)
+    price_eur: float = Field(gt=0, le=10_000_000)
+    created_at: Optional[datetime] = None
+
+
+class SellUpdate(BaseModel):
+    btc_amount: float = Field(gt=0, le=21_000_000)
+    price_eur: float = Field(gt=0, le=10_000_000)
+    created_at: datetime
+
+
+class SellOut(BaseModel):
+    id: int
+    btc_amount: float
+    price_eur: float
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/sells", response_model=List[SellOut])
+def list_sells(
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    return (
+        db.query(models.Sell)
+        .filter(models.Sell.user_id == current_user.id)
+        .order_by(models.Sell.created_at)
+        .all()
+    )
+
+
+@router.post("/sells", response_model=SellOut, status_code=status.HTTP_201_CREATED)
+def add_sell(
+    sell_in: SellCreate,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    sell = models.Sell(
+        btc_amount=sell_in.btc_amount,
+        price_eur=sell_in.price_eur,
+        created_at=sell_in.created_at or datetime.utcnow(),
+        user_id=current_user.id,
+    )
+    db.add(sell)
+    db.commit()
+    db.refresh(sell)
+    return sell
+
+
+@router.put("/sells/{sell_id}", response_model=SellOut)
+def update_sell(
+    sell_id: int,
+    sell_in: SellUpdate,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    sell = db.query(models.Sell).filter(
+        models.Sell.id == sell_id,
+        models.Sell.user_id == current_user.id,
+    ).first()
+    if not sell:
+        raise HTTPException(status_code=404, detail="Sell not found")
+    sell.btc_amount = sell_in.btc_amount
+    sell.price_eur = sell_in.price_eur
+    sell.created_at = sell_in.created_at
+    db.commit()
+    db.refresh(sell)
+    return sell
+
+
+@router.delete("/sells/{sell_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_sell(
+    sell_id: int,
+    db: Session = Depends(get_db),
+    current_user: models.User = Depends(get_current_user),
+):
+    sell = db.query(models.Sell).filter(
+        models.Sell.id == sell_id,
+        models.Sell.user_id == current_user.id,
+    ).first()
+    if not sell:
+        raise HTTPException(status_code=404, detail="Sell not found")
+    db.delete(sell)
+    db.commit()

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

@@ -15,19 +15,27 @@ def get_stats(
     current_user: models.User = Depends(get_current_user),
 ):
     purchases = db.query(models.Purchase).filter(models.Purchase.user_id == current_user.id).all()
+    sells = db.query(models.Sell).filter(models.Sell.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
+    total_btc_bought = sum(p.amount_eur / p.price_eur for p in purchases) if purchases else 0.0
+
+    total_btc_sold = sum(s.btc_amount for s in sells)
+    proceeds_eur = sum(s.btc_amount * s.price_eur for s in sells)
+
+    net_btc = total_btc_bought - total_btc_sold
+    net_invested = total_invested - proceeds_eur
+    average_price = net_invested / net_btc if net_btc > 0 else 0.0
+    current_price, price_is_cached = get_btc_price_eur()
+    portfolio_value = net_btc * current_price
+    profit_loss = portfolio_value - net_invested
 
     return {
-        "total_invested": round(total_invested, 2),
-        "total_btc": round(total_btc, 8),
+        "total_invested": round(net_invested, 2),
+        "total_btc": round(net_btc, 8),
         "average_price": round(average_price, 2),
         "current_price": round(current_price, 2),
+        "price_is_cached": price_is_cached,
         "portfolio_value": round(portfolio_value, 2),
         "profit_loss": round(profit_loss, 2),
     }

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

@@ -1,6 +1,6 @@
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.orm import Session
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 from ..database import get_db
 from .. import models
@@ -10,6 +10,11 @@ router = APIRouter()
 
 
 class UserCreate(BaseModel):
+    username: str = Field(min_length=3, max_length=50)
+    password: str = Field(min_length=8)
+
+
+class UserLogin(BaseModel):
     username: str
     password: str
 
@@ -37,7 +42,7 @@ def register(user_in: UserCreate, db: Session = Depends(get_db)):
 
 
 @router.post("/login", response_model=Token)
-def login(user_in: UserCreate, db: Session = Depends(get_db)):
+def login(user_in: UserLogin, 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")

btc-portfolio/backend/app/services/btc.py

@@ -1,6 +1,9 @@
+import logging
 import requests
 from datetime import datetime, timezone
 
+logger = logging.getLogger(__name__)
+
 
 def get_btc_history_eur() -> list:
     try:
@@ -11,7 +14,8 @@ def get_btc_history_eur() -> list:
         )
         resp.raise_for_status()
         return resp.json().get("prices", [])  # [[timestamp_ms, price], ...]
-    except Exception:
+    except Exception as e:
+        logger.error(f"Failed to fetch BTC history: {e}")
         return []
 
 
@@ -25,7 +29,8 @@ def get_btc_ohlc_eur(days: int) -> list:
         )
         resp.raise_for_status()
         return resp.json()  # [[timestamp_ms, open, high, low, close], ...]
-    except Exception:
+    except Exception as e:
+        logger.error(f"Failed to fetch BTC OHLC: {e}")
         return []
 
 
@@ -49,7 +54,12 @@ def aggregate_to_daily(raw: list) -> dict:
     return by_date
 
 
-def get_btc_price_eur() -> float:
+_last_known_price: float = 0.0
+
+
+def get_btc_price_eur() -> tuple[float, bool]:
+    """Returns (price, is_cached). is_cached=True when using a stale fallback."""
+    global _last_known_price
     try:
         resp = requests.get(
             "https://api.coingecko.com/api/v3/simple/price",
@@ -57,6 +67,9 @@ def get_btc_price_eur() -> float:
             timeout=10,
         )
         resp.raise_for_status()
-        return float(resp.json()["bitcoin"]["eur"])
-    except Exception:
-        return 0.0
+        price = float(resp.json()["bitcoin"]["eur"])
+        _last_known_price = price
+        return price, False
+    except Exception as e:
+        logger.error(f"Failed to fetch BTC price: {e}")
+        return _last_known_price, True

btc-portfolio/backend/app/services/candles.py

@@ -1,10 +1,10 @@
 import logging
-from datetime import datetime, timezone, date as dt_date
+from datetime import datetime, timezone, timedelta, date as dt_date
 
 from sqlalchemy.orm import Session
 
 from ..models import OHLCCandle
-from .btc import get_btc_ohlc_eur, aggregate_to_daily
+from .btc import get_btc_ohlc_eur, aggregate_to_daily, get_btc_history_eur
 
 logger = logging.getLogger(__name__)
 
@@ -30,10 +30,54 @@ def seed_candles(db: Session) -> None:
     logger.info("Candle seed: stored %d daily candles (%s → %s).", len(rows), min(daily.keys()), max(daily.keys()))
 
 
+def seed_historical_prices(db: Session) -> None:
+    """Backfill up to 365 days of daily close prices from CoinGecko market_chart.
+    Uses previous day's close as each day's open to produce red/green candles.
+    Clears entries older than 31 days on each run so the data stays fresh.
+    Real OHLC entries (last 30 days) are never touched.
+    """
+    raw = get_btc_history_eur()
+    if not raw:
+        logger.warning("Historical price seed: CoinGecko returned no data.")
+        return
+
+    prices = {}
+    for ts_ms, price in raw:
+        date = datetime.fromtimestamp(ts_ms / 1000, tz=timezone.utc).strftime("%Y-%m-%d")
+        prices[date] = price
+
+    # Remove stale historical entries (older than 31 days) so they get re-seeded with current data
+    cutoff = (datetime.now(tz=timezone.utc) - timedelta(days=31)).strftime("%Y-%m-%d")
+    db.query(OHLCCandle).filter(OHLCCandle.date < cutoff).delete()
+    db.commit()
+
+    existing = {c.date for c in db.query(OHLCCandle).all()}
+
+    new_rows = []
+    prev_close = None
+    for date, close in sorted(prices.items()):
+        if date in existing:
+            prev_close = close
+            continue
+        open_ = prev_close if prev_close is not None else close
+        high = max(open_, close)
+        low = min(open_, close)
+        new_rows.append(OHLCCandle(date=date, open=open_, high=high, low=low, close=close))
+        prev_close = close
+
+    if new_rows:
+        db.add_all(new_rows)
+        db.commit()
+        logger.info("Historical price seed: stored %d daily entries (%s → %s).", len(new_rows), new_rows[0].date, new_rows[-1].date)
+
+
 def refresh_latest_candles(db: Session) -> None:
     """Add any missing candles up to today. Seeds the DB if empty.
     Also detects and replaces coarse (>2-day gap) legacy data from a previous days=365 seed.
     """
+    # Always backfill historical prices for dates not yet in DB (no-op once populated)
+    seed_historical_prices(db)
+
     # Sparse-data detection: if existing candles have >2-day gaps, wipe and re-seed
     first_two = db.query(OHLCCandle).order_by(OHLCCandle.date.asc()).limit(2).all()
     if len(first_two) == 2:

btc-portfolio/docker-compose.yml

@@ -7,15 +7,29 @@ services:
       - ./data:/app/data
     environment:
       - DATABASE_URL=sqlite:////app/data/btc_portfolio.db
+      - SECRET_KEY=${SECRET_KEY:-dev-insecure-key-change-me}
+      - ALLOWED_ORIGINS=${ALLOWED_ORIGINS:-http://localhost:3000,http://localhost:3001}
     restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/')"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 15s
 
   frontend:
     build:
       context: ./frontend
       args:
-        - REACT_APP_API_URL=http://localhost:8000
+        - REACT_APP_API_URL=/api
     ports:
-      - "3001:3001"
+      - "3001:80"
     depends_on:
       - backend
     restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:80/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 20s

btc-portfolio/frontend/.dockerignore

@@ -0,0 +1,6 @@
+.git
+node_modules
+build
+.env
+.env.local
+npm-debug.log

btc-portfolio/frontend/Dockerfile

@@ -4,13 +4,12 @@ WORKDIR /app
 COPY package.json ./
 RUN npm install
 COPY . .
-ARG REACT_APP_API_URL=http://localhost:8000
+ARG REACT_APP_API_URL=/api
 ENV REACT_APP_API_URL=$REACT_APP_API_URL
 RUN npm run build
 
-FROM node:18-alpine
-RUN npm install -g serve
-WORKDIR /app
-COPY --from=build /app/build ./build
-EXPOSE 3001
-CMD ["serve", "-s", "build", "-l", "3001"]
+FROM nginx:alpine
+COPY --from=build /app/build /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

btc-portfolio/frontend/nginx.conf

@@ -0,0 +1,20 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass         http://backend:8000/;
+        proxy_http_version 1.1;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

btc-portfolio/frontend/src/components/AddPurchase.js

@@ -12,6 +12,7 @@ const styles = {
 };
 
 export default function AddPurchase({ onAdded }) {
+  const [purchaseDate, setPurchaseDate] = useState(new Date().toISOString().split('T')[0]);
   const [amountEur, setAmountEur] = useState('');
   const [priceEur, setPriceEur] = useState('');
   const [error, setError] = useState('');
@@ -30,16 +31,19 @@ export default function AddPurchase({ onAdded }) {
         body: JSON.stringify({
           amount_eur: parseFloat(amountEur),
           price_eur: parseFloat(priceEur),
+          created_at: new Date(purchaseDate + 'T12:00:00').toISOString(),
         }),
       });
       if (!res.ok) {
         setError('Failed to add purchase');
         return;
       }
+      setPurchaseDate(new Date().toISOString().split('T')[0]);
       setAmountEur('');
       setPriceEur('');
       onAdded();
-    } catch {
+    } catch (err) {
+      console.error('AddPurchase network error:', err);
       setError('Network error');
     }
   };
@@ -49,6 +53,13 @@ export default function AddPurchase({ onAdded }) {
       <div style={styles.title}>Add Purchase</div>
       <form onSubmit={handleSubmit}>
         <div style={styles.row}>
+          <input
+            style={styles.input}
+            type="date"
+            value={purchaseDate}
+            onChange={e => setPurchaseDate(e.target.value)}
+            required
+          />
           <input
             style={styles.input}
             type="number"

btc-portfolio/frontend/src/components/AddSell.js

@@ -0,0 +1,87 @@
+import React, { useState } from 'react';
+
+const API = process.env.REACT_APP_API_URL || 'http://localhost:8000';
+
+const styles = {
+  card: { background: '#1a1a1a', padding: '1.5rem', borderRadius: '12px', border: '1px solid #333', marginBottom: '1.5rem' },
+  title: { fontSize: '1.1rem', fontWeight: 700, marginBottom: '1rem', color: '#f7931a' },
+  row: { display: 'flex', gap: '0.75rem', flexWrap: 'wrap' },
+  input: { flex: 1, minWidth: '140px', padding: '0.65rem', background: '#2a2a2a', border: '1px solid #444', borderRadius: '8px', color: '#e0e0e0', fontSize: '1rem' },
+  button: { padding: '0.65rem 1.5rem', background: '#f7931a', color: '#000', border: 'none', borderRadius: '8px', fontWeight: 700, cursor: 'pointer' },
+  error: { color: '#ff6b6b', marginTop: '0.5rem', fontSize: '0.9rem' },
+};
+
+export default function AddSell({ onAdded }) {
+  const [sellDate, setSellDate] = useState(new Date().toISOString().split('T')[0]);
+  const [btcAmount, setBtcAmount] = useState('');
+  const [priceEur, setPriceEur] = useState('');
+  const [error, setError] = useState('');
+
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+    setError('');
+    const token = localStorage.getItem('token');
+    try {
+      const res = await fetch(`${API}/sells`, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: `Bearer ${token}`,
+        },
+        body: JSON.stringify({
+          btc_amount: parseFloat(btcAmount),
+          price_eur: parseFloat(priceEur),
+          created_at: new Date(sellDate + 'T12:00:00').toISOString(),
+        }),
+      });
+      if (!res.ok) {
+        setError('Failed to add sell');
+        return;
+      }
+      setSellDate(new Date().toISOString().split('T')[0]);
+      setBtcAmount('');
+      setPriceEur('');
+      onAdded();
+    } catch (err) {
+      console.error('AddSell network error:', err);
+      setError('Network error');
+    }
+  };
+
+  return (
+    <div style={styles.card}>
+      <div style={styles.title}>Add Sell</div>
+      <form onSubmit={handleSubmit}>
+        <div style={styles.row}>
+          <input
+            style={styles.input}
+            type="date"
+            value={sellDate}
+            onChange={e => setSellDate(e.target.value)}
+            required
+          />
+          <input
+            style={styles.input}
+            type="number"
+            step="any"
+            placeholder="BTC Amount"
+            value={btcAmount}
+            onChange={e => setBtcAmount(e.target.value)}
+            required
+          />
+          <input
+            style={styles.input}
+            type="number"
+            step="any"
+            placeholder="BTC Price (EUR)"
+            value={priceEur}
+            onChange={e => setPriceEur(e.target.value)}
+            required
+          />
+          <button style={styles.button} type="submit">Add</button>
+        </div>
+        {error && <div style={styles.error}>{error}</div>}
+      </form>
+    </div>
+  );
+}

btc-portfolio/frontend/src/components/BTCCandlestickChart.js

@@ -39,7 +39,7 @@ const btnStyle = {
   marginLeft: '0.5rem',
 };
 
-export default function BTCCandlestickChart({ candles, purchases, stats, fullscreen, onToggleFullscreen }) {
+export default function BTCCandlestickChart({ candles, purchases, stats, fullscreen, onToggleFullscreen, livePrice }) {
   const containerRef = useRef(null);
   const chartRef = useRef(null);
   const candleSeriesRef = useRef(null);
@@ -167,7 +167,14 @@ export default function BTCCandlestickChart({ candles, purchases, stats, fullscr
   return (
     <div style={fullscreen ? fullscreenStyle : cardStyle}>
       <div style={headerStyle}>
-        <div style={titleStyle}>BTC Candles (EUR)</div>
+        <div style={titleStyle}>
+          BTC Candles (EUR)
+          {livePrice != null && (
+            <span style={{ fontSize: '0.9rem', fontWeight: 400, color: '#ccc', marginLeft: '0.75rem' }}>
+              €{livePrice.toLocaleString()}
+            </span>
+          )}
+        </div>
         <div>
           <button style={btnStyle} onClick={handleSave}>Save as PNG</button>
           <button style={btnStyle} onClick={onToggleFullscreen}>

btc-portfolio/frontend/src/components/PortfolioChart.js

@@ -19,40 +19,93 @@ const styles = {
   saveBtn: { marginTop: '0.75rem', background: 'none', border: '1px solid #555', color: '#aaa', borderRadius: '6px', padding: '0.4rem 1rem', cursor: 'pointer', fontSize: '0.85rem' },
 };
 
-export default function PortfolioChart({ purchases, stats }) {
+function toDateKey(date) {
+  return date.toISOString().split('T')[0];
+}
+
+function priceOn(date, priceMap, currentPrice, isToday, sortedPurchases) {
+  if (isToday) return currentPrice || 0;
+  // Try candle history (walk back up to 7 days)
+  for (let i = 0; i <= 7; i++) {
+    const d = new Date(date);
+    d.setDate(d.getDate() - i);
+    const p = priceMap[toDateKey(d)];
+    if (p) return p;
+  }
+  // Fall back to most recent purchase price up to this date
+  let fallback = null;
+  for (const p of sortedPurchases) {
+    const pd = new Date(p.created_at);
+    pd.setHours(0, 0, 0, 0);
+    if (pd <= date) fallback = p.price_eur;
+  }
+  return fallback;
+}
+
+export default function PortfolioChart({ purchases, sells, stats, btcHistory }) {
   const chartRef = useRef(null);
 
   if (!purchases || purchases.length === 0) return null;
 
-  // Build cumulative data points sorted by date
   const sorted = [...purchases].sort((a, b) => new Date(a.created_at) - new Date(b.created_at));
+  const sortedSells = [...(sells || [])].sort((a, b) => new Date(a.created_at) - new Date(b.created_at));
+  const today = new Date();
+  today.setHours(0, 0, 0, 0);
+
+  // Build price lookup from candle history
+  const priceMap = {};
+  (btcHistory || []).forEach(({ date, close }) => { priceMap[date] = close; });
+
+  const firstDate = new Date(sorted[0].created_at);
+  firstDate.setHours(0, 0, 0, 0);
+
+  // Generate biweekly dates from first purchase to today
+  const dates = [];
+  const cursor = new Date(firstDate);
+  while (cursor <= today) {
+    dates.push(new Date(cursor));
+    cursor.setDate(cursor.getDate() + 7);
+  }
+  if (toDateKey(dates[dates.length - 1]) !== toDateKey(today)) {
+    dates.push(new Date(today));
+  }
 
-  let cumInvested = 0;
-  let cumBtc = 0;
   const labels = [];
   const portfolioValues = [];
   const investedValues = [];
 
-  sorted.forEach((p, i) => {
-    cumInvested += p.amount_eur;
-    cumBtc += p.amount_eur / p.price_eur;
-    const currentVal = cumBtc * (stats?.current_price || p.price_eur);
-    labels.push(new Date(p.created_at).toLocaleDateString());
-    portfolioValues.push(parseFloat(currentVal.toFixed(2)));
+  dates.forEach(date => {
+    const isToday = toDateKey(date) === toDateKey(today);
+    const price = priceOn(date, priceMap, stats?.current_price, isToday, sorted);
+    if (price === null) return; // no price data available, skip
+
+    // Cumulative BTC and invested up to this date
+    let cumBtc = 0;
+    let cumInvested = 0;
+    sorted.forEach(p => {
+      const pDate = new Date(p.created_at);
+      pDate.setHours(0, 0, 0, 0);
+      if (pDate <= date) {
+        cumBtc += p.amount_eur / p.price_eur;
+        cumInvested += p.amount_eur;
+      }
+    });
+    sortedSells.forEach(s => {
+      const sDate = new Date(s.created_at);
+      sDate.setHours(0, 0, 0, 0);
+      if (sDate <= date) {
+        cumBtc -= s.btc_amount;
+        cumInvested -= s.btc_amount * s.price_eur;
+      }
+    });
+
+    if (cumBtc === 0) return; // no purchases yet at this date
+
+    labels.push(date.toLocaleDateString('en-GB'));
+    portfolioValues.push(parseFloat((cumBtc * price).toFixed(2)));
     investedValues.push(parseFloat(cumInvested.toFixed(2)));
   });
 
-  const todayLabel = new Date().toLocaleDateString();
-  if (labels.length === 0 || labels[labels.length - 1] !== todayLabel) {
-    const currentVal = cumBtc * (stats?.current_price || 0);
-    labels.push(todayLabel);
-    portfolioValues.push(parseFloat(currentVal.toFixed(2)));
-    investedValues.push(parseFloat(cumInvested.toFixed(2)));
-  }
-
-  const currentPrice = stats?.current_price || 0;
-  const breakEvenLine = labels.map(() => stats?.average_price || 0);
-
   const data = {
     labels,
     datasets: [

btc-portfolio/frontend/src/components/SellList.js

@@ -0,0 +1,119 @@
+import React, { useState } from 'react';
+
+const API = process.env.REACT_APP_API_URL || 'http://localhost:8000';
+
+const styles = {
+  card: { background: '#1a1a1a', padding: '1.5rem', borderRadius: '12px', border: '1px solid #333', marginBottom: '1.5rem' },
+  title: { fontSize: '1.1rem', fontWeight: 700, marginBottom: '1rem', color: '#f7931a' },
+  table: { width: '100%', borderCollapse: 'collapse' },
+  th: { textAlign: 'left', padding: '0.5rem 0.75rem', borderBottom: '1px solid #333', color: '#888', fontSize: '0.85rem' },
+  td: { padding: '0.6rem 0.75rem', borderBottom: '1px solid #222', fontSize: '0.95rem' },
+  input: { background: '#2a2a2a', border: '1px solid #555', borderRadius: '6px', color: '#e0e0e0', padding: '0.3rem 0.5rem', fontSize: '0.9rem', width: '100%' },
+  editBtn: { background: 'none', border: '1px solid #555', color: '#4fc3f7', borderRadius: '6px', padding: '0.25rem 0.6rem', cursor: 'pointer', fontSize: '0.85rem', marginRight: '0.4rem' },
+  saveBtn: { background: 'none', border: '1px solid #6bff8e', color: '#6bff8e', borderRadius: '6px', padding: '0.25rem 0.6rem', cursor: 'pointer', fontSize: '0.85rem', marginRight: '0.4rem' },
+  cancelBtn: { background: 'none', border: '1px solid #555', color: '#aaa', borderRadius: '6px', padding: '0.25rem 0.6rem', cursor: 'pointer', fontSize: '0.85rem', marginRight: '0.4rem' },
+  deleteBtn: { background: 'none', border: '1px solid #555', color: '#ff6b6b', borderRadius: '6px', padding: '0.25rem 0.6rem', cursor: 'pointer', fontSize: '0.85rem' },
+  empty: { color: '#555', textAlign: 'center', padding: '1rem' },
+};
+
+function toDateInputValue(isoString) {
+  return isoString ? isoString.slice(0, 10) : '';
+}
+
+export default function SellList({ sells, onChanged }) {
+  const [editingId, setEditingId] = useState(null);
+  const [editForm, setEditForm] = useState({});
+
+  const token = () => localStorage.getItem('token');
+
+  const startEdit = (s) => {
+    setEditingId(s.id);
+    setEditForm({
+      btc_amount: s.btc_amount,
+      price_eur: s.price_eur,
+      created_at: toDateInputValue(s.created_at),
+    });
+  };
+
+  const cancelEdit = () => setEditingId(null);
+
+  const handleSave = async (id) => {
+    const res = await fetch(`${API}/sells/${id}`, {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token()}` },
+      body: JSON.stringify({
+        btc_amount: parseFloat(editForm.btc_amount),
+        price_eur: parseFloat(editForm.price_eur),
+        created_at: new Date(editForm.created_at + 'T12:00:00').toISOString(),
+      }),
+    });
+    if (res.ok) {
+      setEditingId(null);
+      onChanged();
+    }
+  };
+
+  const handleDelete = async (id) => {
+    await fetch(`${API}/sells/${id}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${token()}` },
+    });
+    onChanged();
+  };
+
+  const set = (field) => (e) => setEditForm(f => ({ ...f, [field]: e.target.value }));
+
+  return (
+    <div style={styles.card}>
+      <div style={styles.title}>Sells</div>
+      {sells.length === 0 ? (
+        <div style={styles.empty}>No sells yet.</div>
+      ) : (
+        <table style={styles.table}>
+          <thead>
+            <tr>
+              <th style={styles.th}>Date</th>
+              <th style={styles.th}>BTC Amount</th>
+              <th style={styles.th}>Price (€/BTC)</th>
+              <th style={styles.th}>Value (€)</th>
+              <th style={styles.th}></th>
+            </tr>
+          </thead>
+          <tbody>
+            {sells.map(s => editingId === s.id ? (
+              <tr key={s.id}>
+                <td style={styles.td}>
+                  <input style={styles.input} type="date" value={editForm.created_at} onChange={set('created_at')} />
+                </td>
+                <td style={styles.td}>
+                  <input style={styles.input} type="number" step="any" value={editForm.btc_amount} onChange={set('btc_amount')} />
+                </td>
+                <td style={styles.td}>
+                  <input style={styles.input} type="number" step="any" value={editForm.price_eur} onChange={set('price_eur')} />
+                </td>
+                <td style={styles.td}>
+                  €{(parseFloat(editForm.btc_amount) * parseFloat(editForm.price_eur) || 0).toLocaleString()}
+                </td>
+                <td style={styles.td}>
+                  <button style={styles.saveBtn} onClick={() => handleSave(s.id)}>Save</button>
+                  <button style={styles.cancelBtn} onClick={cancelEdit}>Cancel</button>
+                </td>
+              </tr>
+            ) : (
+              <tr key={s.id}>
+                <td style={styles.td}>{new Date(s.created_at).toLocaleDateString('en-GB')}</td>
+                <td style={styles.td}>₿{s.btc_amount.toFixed(8)}</td>
+                <td style={styles.td}>€{s.price_eur.toLocaleString()}</td>
+                <td style={styles.td}>€{(s.btc_amount * s.price_eur).toLocaleString()}</td>
+                <td style={styles.td}>
+                  <button style={styles.editBtn} onClick={() => startEdit(s)}>Edit</button>
+                  <button style={styles.deleteBtn} onClick={() => handleDelete(s.id)}>Delete</button>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      )}
+    </div>
+  );
+}

btc-portfolio/frontend/src/pages/AdminPage.js

@@ -66,7 +66,12 @@ export default function AdminPage() {
 
   const handleDelete = async (id, name) => {
     if (!window.confirm(`Delete user "${name}"? This also deletes all their purchases.`)) return;
-    await fetch(`${API}/admin/users/${id}`, { method: 'DELETE', headers: authHeaders() });
+    const res = await fetch(`${API}/admin/users/${id}`, { method: 'DELETE', headers: authHeaders() });
+    if (!res.ok) {
+      const data = await res.json().catch(() => ({}));
+      setError(data.detail || 'Failed to delete user');
+      return;
+    }
     fetchUsers();
   };
 

btc-portfolio/frontend/src/pages/Dashboard.js

@@ -2,6 +2,8 @@ import React, { useState, useEffect, useCallback } from 'react';
 import { useNavigate, Link } from 'react-router-dom';
 import AddPurchase from '../components/AddPurchase';
 import PurchaseList from '../components/PurchaseList';
+import AddSell from '../components/AddSell';
+import SellList from '../components/SellList';
 import PortfolioChart from '../components/PortfolioChart';
 import BTCCandlestickChart from '../components/BTCCandlestickChart';
 
@@ -15,6 +17,13 @@ const styles = {
   adminBtn: { background: 'none', border: '1px solid #f7931a', color: '#f7931a', borderRadius: '8px', padding: '0.4rem 1rem', cursor: 'pointer', textDecoration: 'none', fontSize: '1rem' },
   headerBtns: { display: 'flex', gap: '0.5rem', alignItems: 'center' },
   statsGrid: { display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '1rem', marginBottom: '1.5rem' },
+  predictionSection: { background: '#1a1a1a', border: '1px solid #333', borderRadius: '12px', padding: '1rem', marginBottom: '1.5rem' },
+  predictionHeader: { color: '#888', fontSize: '0.8rem', marginBottom: '0.75rem' },
+  predictionRow: { display: 'flex', gap: '1rem', alignItems: 'flex-start', flexWrap: 'wrap' },
+  predictionInputWrap: { display: 'flex', flexDirection: 'column', gap: '0.3rem' },
+  predictionLabel: { color: '#888', fontSize: '0.8rem' },
+  predictionInput: { background: '#111', border: '1px solid #444', borderRadius: '8px', color: '#fff', padding: '0.55rem 0.75rem', fontSize: '1rem', width: '160px', outline: 'none' },
+  predictionCards: { display: 'flex', gap: '1rem', flex: 1, flexWrap: 'wrap' },
   statCard: { background: '#1a1a1a', padding: '1rem', borderRadius: '12px', border: '1px solid #333' },
   statLabel: { color: '#888', fontSize: '0.8rem', marginBottom: '0.3rem' },
   statValue: { fontSize: '1.2rem', fontWeight: 700 },
@@ -26,11 +35,19 @@ const styles = {
   tabActive: { padding: '0.45rem 1.1rem', borderRadius: '8px', border: '1px solid #f7931a', background: 'rgba(247,147,26,0.1)', color: '#f7931a', cursor: 'pointer', fontSize: '0.9rem', fontWeight: 700 },
 };
 
-function StatCard({ label, value, highlight }) {
+function StatCard({ label, value, highlight, warning }) {
   return (
     <div style={styles.statCard}>
-      <div style={styles.statLabel}>{label}</div>
+      <div style={{ ...styles.statLabel, display: 'flex', alignItems: 'center', gap: '0.3rem' }}>
+        {label}
+        {warning && (
+          <span title={warning} style={{ color: '#f7931a', cursor: 'default', fontSize: '0.85rem' }}>⚠</span>
+        )}
+      </div>
       <div style={{ ...styles.statValue, ...(highlight ? styles[highlight] : {}) }}>{value}</div>
+      {warning && (
+        <div style={{ color: '#888', fontSize: '0.7rem', marginTop: '0.25rem' }}>{warning}</div>
+      )}
     </div>
   );
 }
@@ -38,10 +55,12 @@ function StatCard({ label, value, highlight }) {
 export default function Dashboard() {
   const [stats, setStats] = useState(null);
   const [purchases, setPurchases] = useState([]);
+  const [sells, setSells] = useState([]);
   const [candles, setCandles] = useState(null);
   const [candlesAll, setCandlesAll] = useState(null);
   const [fullscreenChart, setFullscreenChart] = useState(false);
   const [chartView, setChartView] = useState('both'); // 'both' | 'portfolio' | 'history'
+  const [predictionPrice, setPredictionPrice] = useState('');
   const navigate = useNavigate();
 
   const authHeaders = () => ({
@@ -50,9 +69,10 @@ export default function Dashboard() {
 
   const fetchData = useCallback(async () => {
     try {
-      const [statsRes, purchasesRes, candlesRes] = await Promise.all([
+      const [statsRes, purchasesRes, sellsRes, candlesRes] = await Promise.all([
         fetch(`${API}/stats`,            { headers: authHeaders() }),
         fetch(`${API}/purchases`,        { headers: authHeaders() }),
+        fetch(`${API}/sells`,            { headers: authHeaders() }),
         fetch(`${API}/candles?days=365`, { headers: authHeaders() }),
       ]);
       if (statsRes.status === 401) {
@@ -62,6 +82,7 @@ export default function Dashboard() {
       }
       setStats(await statsRes.json());
       setPurchases(await purchasesRes.json());
+      setSells(await sellsRes.json());
       setCandles(await candlesRes.json());
     } catch {
       // silently fail — network may be unavailable
@@ -94,6 +115,12 @@ export default function Dashboard() {
     setFullscreenChart(f => !f);
   }, [fullscreenChart, candlesAll, fetchAllCandles]);
 
+  const predPrice = parseFloat(predictionPrice);
+  const predValid = stats && predictionPrice !== '' && predPrice > 0;
+  const predValue = predValid ? +(stats.total_btc * predPrice).toFixed(2) : null;
+  const predPL = predValid ? +(predValue - stats.total_invested).toFixed(2) : null;
+  const predVsCurrent = predValid ? +(predValue - stats.portfolio_value).toFixed(2) : null;
+
   const plHighlight = stats
     ? stats.profit_loss >= 0 ? 'positive' : 'negative'
     : 'neutral';
@@ -116,7 +143,11 @@ export default function Dashboard() {
           <StatCard label="Total Invested" value={`€${stats.total_invested.toLocaleString()}`} />
           <StatCard label="Avg Buy Price" value={`€${stats.average_price.toLocaleString()}`} />
           <StatCard label="Total BTC" value={`₿${stats.total_btc}`} highlight="neutral" />
-          <StatCard label="Current BTC Price" value={`€${stats.current_price.toLocaleString()}`} />
+          <StatCard
+            label="Current BTC Price"
+            value={`€${stats.current_price.toLocaleString()}`}
+            warning={stats.price_is_cached ? 'Price may be outdated — live fetch failed' : undefined}
+          />
           <StatCard label="Portfolio Value" value={`€${stats.portfolio_value.toLocaleString()}`} />
           <StatCard
             label="Profit / Loss"
@@ -126,6 +157,42 @@ export default function Dashboard() {
         </div>
       )}
 
+      <div style={styles.predictionSection}>
+        <div style={styles.predictionHeader}>Price Prediction</div>
+        <div style={styles.predictionRow}>
+          <div style={styles.predictionInputWrap}>
+            <label style={styles.predictionLabel}>BTC Price (€)</label>
+            <input
+              type="number"
+              min="0"
+              placeholder="e.g. 100000"
+              value={predictionPrice}
+              onChange={e => setPredictionPrice(e.target.value)}
+              style={styles.predictionInput}
+            />
+          </div>
+          {predValid && (
+            <div style={styles.predictionCards}>
+              <StatCard
+                label="Predicted Value"
+                value={`€${predValue.toLocaleString()}`}
+                highlight="neutral"
+              />
+              <StatCard
+                label="Predicted P&L"
+                value={`${predPL >= 0 ? '+' : ''}€${predPL.toLocaleString()}`}
+                highlight={predPL >= 0 ? 'positive' : 'negative'}
+              />
+              <StatCard
+                label="vs. Current"
+                value={`${predVsCurrent >= 0 ? '+' : ''}€${predVsCurrent.toLocaleString()}`}
+                highlight={predVsCurrent >= 0 ? 'positive' : 'negative'}
+              />
+            </div>
+          )}
+        </div>
+      </div>
+
       <div style={styles.tabs}>
         {[['both', 'Both'], ['portfolio', 'Portfolio'], ['history', 'BTC Candles']].map(([key, label]) => (
           <button
@@ -135,18 +202,21 @@ export default function Dashboard() {
           >{label}</button>
         ))}
       </div>
-      {(chartView === 'both' || chartView === 'portfolio') && <PortfolioChart purchases={purchases} stats={stats} />}
+      {(chartView === 'both' || chartView === 'portfolio') && <PortfolioChart purchases={purchases} sells={sells} stats={stats} btcHistory={candles?.candles ?? []} />}
       {(chartView === 'both' || chartView === 'history') && (
         <BTCCandlestickChart
           candles={activeCandles?.candles ?? null}
           purchases={activeCandles?.purchases ?? purchases}
           stats={stats}
+          livePrice={stats?.current_price ?? null}
           fullscreen={fullscreenChart}
           onToggleFullscreen={handleToggleFullscreen}
         />
       )}
       <AddPurchase onAdded={fetchData} />
       <PurchaseList purchases={purchases} onChanged={fetchData} />
+      <AddSell onAdded={fetchData} />
+      <SellList sells={sells} onChanged={fetchData} />
     </div>
   );
 }

btc-portfolio/frontend/src/pages/Login.js

@@ -37,7 +37,8 @@ export default function Login() {
       localStorage.setItem('token', data.access_token);
       localStorage.setItem('is_admin', data.is_admin ? 'true' : 'false');
       navigate('/');
-    } catch {
+    } catch (err) {
+      console.error('Login network error:', err);
       setError('Network error');
     }
   };

btc-portfolio/frontend/src/pages/Register.js

@@ -38,7 +38,8 @@ export default function Register() {
       }
       setSuccess('Account created! Redirecting...');
       setTimeout(() => navigate('/login'), 1500);
-    } catch {
+    } catch (err) {
+      console.error('Register network error:', err);
       setError('Network error');
     }
   };