Update app.py

app.py

@@ -313,7 +313,17 @@ def get_all_students_from_db():
     try:
         conn = db.get_db_connection()
         with conn.cursor() as cursor:
-            cursor.execute("SELECT usn, data, MAX(timestamp) as max_time FROM results_cache_v2 GROUP BY usn, data ORDER BY usn")
+            cursor.execute("""
+                SELECT t1.usn, t1.data 
+                FROM results_cache_v2 t1
+                JOIN (
+                    SELECT usn, MAX(timestamp) as max_time 
+                    FROM results_cache_v2 
+                    GROUP BY usn
+                ) t2 ON t1.usn = t2.usn AND t1.timestamp = t2.max_time
+                GROUP BY t1.usn
+                ORDER BY t1.usn
+            """)
             rows = cursor.fetchall()
         conn.close()