diff --git a/backend/src/backend/services/storage.py b/backend/src/backend/services/storage.py
index 0789b43..6f72678 100644
--- a/backend/src/backend/services/storage.py
+++ b/backend/src/backend/services/storage.py
@@ -406,6 +406,16 @@ async def create_server_object_payload(
     )
     session.add(item)
     await session.flush()
+    # Force SQLAlchemy to round-trip server-default columns
+    # (created_at / updated_at / is_deleted) in the *current* async
+    # context. ``eager_defaults="auto"`` on the mapper does not
+    # guarantee a refresh for non-PK server defaults; without this,
+    # ``storage_payload`` (a sync helper) would later trigger a lazy
+    # refresh through the async driver and raise MissingGreenlet.
+    await session.refresh(
+        item,
+        attribute_names=["created_at", "updated_at", "is_deleted"],
+    )
     item.relative_path = payload.relative_path
     upload.storage_object_id = item.storage_object_id
     upload.upload_status = "completed"