Make repo sync blocking to prevent data loss

annotate_tips.py

@@ -104,7 +104,7 @@ def save_annotation_file(annotator, data):
     path = os.path.join(ANNOTATION_DIR, f'{annotator}.json')
     with open(path, 'w') as f:
         json.dump(data, f, indent=2)
-    threading.Thread(target=_sync_to_repo, args=(annotator,), daemon=True).start()
+    _sync_to_repo(annotator)  # blocking sync to HF repo so no data is lost
 
 
 # ─── Routes ───