deploy version

assets/python/data.py

@@ -195,7 +195,8 @@ def data_endpoint():
             # Convert timestamps to string for JSON serialization
             if 'start_time' in df.columns:
                 logger.info("Converting timestamps...")
-                df['start_time'] = pd.to_datetime(df['start_time']).astype(str)
+                # Most flexible approach:
+                df['start_time'] = pd.to_datetime(df['start_time'], format='mixed', errors='coerce').astype(str)
             
             # Convert to records and handle NaN values
             logger.info("Converting to records...")