d

domain-api/app/services/export_service.py

@@ -145,7 +145,8 @@ def _write_txt(path, rows: list[dict]) -> None:
 
 
 def _write_csv(path, rows: list[dict]) -> None:
-    with path.open("w", encoding="utf-8", newline="") as handle:
+    # Add BOM so Excel on Chinese Windows opens CSV without mojibake.
+    with path.open("w", encoding="utf-8-sig", newline="") as handle:
         writer = csv.writer(handle)
         writer.writerow([label for _, label in EXPORT_HEADERS])
         for row in rows: