diff --git a/cloud_backend/models/manager_account.py b/cloud_backend/models/manager_account.py
index 547d473..3fff7f4 100644
--- a/cloud_backend/models/manager_account.py
+++ b/cloud_backend/models/manager_account.py
@@ -2,6 +2,7 @@ from sqlalchemy import Column, Integer, String, DateTime, Table, ForeignKey
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from database import Base
+from models.site import Site  # noqa: F401 — needed so SQLAlchemy resolves "Site" in relationship
 
 
 # Many-to-many: one manager can access multiple sites, one site can have multiple managers