infinite scroll fix

ANNOTATE/web/app.py

@@ -423,13 +423,15 @@ class AnnotationDashboard:
         
         @self.server.route('/api/chart-data', methods=['POST'])
         def get_chart_data():
-            """Get chart data for specified symbol and timeframes"""
+            """Get chart data for specified symbol and timeframes with infinite scroll support"""
             try:
                 data = request.get_json()
                 symbol = data.get('symbol', 'ETH/USDT')
                 timeframes = data.get('timeframes', ['1s', '1m', '1h', '1d'])
                 start_time_str = data.get('start_time')
                 end_time_str = data.get('end_time')
+                limit = data.get('limit', 500)  # Allow client to request more data
+                direction = data.get('direction', 'latest')  # 'latest', 'before', or 'after'
                 
                 if not self.data_loader:
                     return jsonify({
@@ -445,6 +447,10 @@ class AnnotationDashboard:
                 end_time = datetime.fromisoformat(end_time_str.replace('Z', '+00:00')) if end_time_str else None
                 
                 # Fetch data for each timeframe using data loader
+                # This will automatically:
+                # 1. Check DuckDB first
+                # 2. Fetch from API if not in cache
+                # 3. Store in DuckDB for future use
                 chart_data = {}
                 for timeframe in timeframes:
                     df = self.data_loader.get_data(
@@ -452,7 +458,8 @@ class AnnotationDashboard:
                         timeframe=timeframe,
                         start_time=start_time,
                         end_time=end_time,
-                        limit=500
+                        limit=limit,
+                        direction=direction
                     )
                     
                     if df is not None and not df.empty: