diff --git a/python/cocoindex/storages.py b/python/cocoindex/storages.py
index 8a038cd59..f8f5ace61 100644
--- a/python/cocoindex/storages.py
+++ b/python/cocoindex/storages.py
@@ -9,7 +9,7 @@
 class Postgres(op.StorageSpec):
     """Storage powered by Postgres and pgvector."""
 
-    database_url: str | None = None
+    database: AuthEntryReference | None = None
     table_name: str | None = None
 
 @dataclass