Fix price fetch failing after market hours by adding 5-day daily fallback

period=1d interval=1m returns empty after NSE closes at 3:30 PM IST.
Fall back to period=5d interval=1d to get last available close price.

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

indian_paper_trading_strategy/engine/data.py

@@ -78,6 +78,7 @@ def fetch_live_price(
 ):
     if allow_cache is None:
         allow_cache = ALLOW_PRICE_CACHE
+    # Try intraday (works during market hours)
     try:
         df = yf.download(
             ticker,
@@ -97,6 +98,26 @@ def fetch_live_price(
     except Exception:
         pass
 
+    # Fallback: last close from past 5 days (works after market hours)
+    try:
+        df = yf.download(
+            ticker,
+            period="5d",
+            interval="1d",
+            auto_adjust=True,
+            progress=False,
+            timeout=5,
+        )
+        if df is not None and not df.empty:
+            close_value = df["Close"].iloc[-1]
+            if hasattr(close_value, "iloc"):
+                close_value = close_value.iloc[-1]
+            price = float(close_value)
+            _set_last_price(ticker, price, "live", provider="yfinance")
+            return price
+    except Exception:
+        pass
+
     if allow_cache:
         last_live = _get_last_live_price(ticker, provider="yfinance")
         if last_live is not None: