Update app.py

app.py

@@ -331,9 +331,8 @@ def generate_certificate(certificate_model, first_name, last_name):
 def add_certified_user(hf_username, first_name, last_name, pass_percentage):
   repo.git_pull()
   history = pd.read_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME))
-  new_row = pd.DataFrame({'hf_username': hf_username, 'first_name': first_name, 'last_name': last_name, 'pass_percentage': pass_percentage, 'datetime': time.time()})
-  new_history = pd.DataFrame(new_row)
-  history = pd.concat([history, new_history], ignore_index=True)
+  new_history = pd.DataFrame({'hf_username': hf_username, 'first_name': first_name, 'last_name': last_name, 'pass_percentage': pass_percentage, 'datetime': time.time()}, index=[0])
+  history = pd.concat([new_row, history[:]]).reset_index(drop=True)
   print("HISTORY", history)
   history.to_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME), index=False)
   df.to_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME), index=False)