Fix candle chart staleness and show live price on today's candle

- 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>

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/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/pages/Dashboard.js

@@ -208,6 +208,7 @@ export default function Dashboard() {
           candles={activeCandles?.candles ?? null}
           purchases={activeCandles?.purchases ?? purchases}
           stats={stats}
+          livePrice={stats?.current_price ?? null}
           fullscreen={fullscreenChart}
           onToggleFullscreen={handleToggleFullscreen}
         />