Update main.py

main.py

@@ -859,7 +859,7 @@ def submit_quiz_attempt(quiz_id):
 
         # --- Save Quiz Attempt ---
         attempt_res = supabase.table('quiz_attempts').insert({
-            'quiz_id': quiz_id,
+            'quiz_id': str(quiz_id),
             'user_id': user.id,
             'score': score,
             'answers': json.dumps(user_answers) # Save user's submitted answers