Saving created_at in DB

utils/db.py

@@ -33,6 +33,7 @@ def save_results(student_name, class_name, model, book, questions, feedback, rat
         "book": book,
         "questions": questions,
         "feedback": feedback,
-        "rating": rating
+        "rating": rating,
+        "created_at": db.command("serverStatus")["localTime"]
     })
     print("Saved results")