diff --git a/backend/auth/jwt_handler.py b/backend/auth/jwt_handler.py
index e1894ff..0714d9b 100644
--- a/backend/auth/jwt_handler.py
+++ b/backend/auth/jwt_handler.py
@@ -4,6 +4,7 @@
 # Revoked token JTIs persisted to data/revoked_tokens.json.
 
 import json
+import os
 import secrets
 import uuid
 import time
diff --git a/backend/indexer.py b/backend/indexer.py
index 5dbbfa7..d783d43 100644
--- a/backend/indexer.py
+++ b/backend/indexer.py
@@ -332,6 +332,7 @@ async def build_index(progress_callback=None) -> None:
         index.clear()
         _file_lookup.clear()
         path_index.clear()
+        _backlink_index.clear()
         _index_generation += 1
 
     if not vault_config: