check if notification already exists to prevent duplicate insert atte…

…mpts

app/dao/notifications_dao.py

@@ -72,7 +72,7 @@ def dao_create_notification(notification):
     notification.to = "1"
     notification.normalised_to = "1"
 
-    stmt = select(Notification).where(id=notification.id)
+    stmt = select(Notification).where(Notification.id == notification.id)
     result = db.session.execute(stmt).scalar()
     if result is None:
         db.session.add(notification)