Upload updater.py

updater.py

@@ -174,6 +174,12 @@ def process_one_file(local_file: Path, staging_root: Path):
             "close": "Close", "volume": "Volume"
         }, inplace=True)
 
+    # Coerce data types so they match before concatenating
+    if pd.api.types.is_datetime64_any_dtype(df[date_col]):
+        new_df[date_col] = pd.to_datetime(new_df[date_col])
+        if getattr(df[date_col].dt, "tz", None) is not None:
+            new_df[date_col] = new_df[date_col].dt.tz_localize(df[date_col].dt.tz)
+
     combined_df = pd.concat([df, new_df], ignore_index=True)
     combined_df = (
         combined_df.drop_duplicates(subset=[date_col])