Fix Polygon API date range to avoid missing data

- End date now uses yesterday to ensure data availability
- Polygon may not have current day data immediately
- Successfully tested with AAPL and TSLA charts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

polygon_api.py

@@ -33,8 +33,8 @@ class PolygonAPI:
             Dictionary with OHLCV data or None if unavailable
         """
         try:
-            # Calculate date range
-            end_date = datetime.now()
+            # Calculate date range (end yesterday to avoid missing today's data)
+            end_date = datetime.now() - timedelta(days=1)
             start_date = end_date - timedelta(days=days)
 
             # Format dates as YYYY-MM-DD
@@ -57,9 +57,12 @@ class PolygonAPI:
 
             data = response.json()
 
+            # Log response for debugging
+            logger.info(f"Polygon API response status: {data.get('status')}, results count: {len(data.get('results', []))}")
+
             # Check if we got results
             if data.get('status') != 'OK' or not data.get('results'):
-                logger.warning(f"No candle data available for ticker: {ticker}")
+                logger.warning(f"No candle data available for ticker: {ticker}. Response: {data}")
                 return None
 
             results = data['results']