add a lot of changes

backend/middleware/guest.middleware.js

@@ -58,7 +58,8 @@ exports.verifyGuestToken = async (req, res, next) => {
 
     // Attach guest session to request
     req.guestSession = guestSession;
-    req.guestId = decoded.guestId;
+    req.guestId = decoded.guestId; // The guest_id string for display/logging
+    req.guestSessionId = guestSession.id; // The UUID for database foreign keys
     
     next();
   } catch (error) {