Assign number by appearance and then cumsum by iD

Question

This is an example of my data:

df = pd.DataFrame.from_dict({\'id\': [\'A\', \'B\', \'A\', \'C\', \'D\', \'B\', \'C\'], \'val\': [1,2,-3,1,5,6,-2], \'date\':[\