question

29062022-data-using-sc_1.fsm

Here are the changed I made:

1. Both events use data.token as the Row Value. If you want to update a row with a later event, the later event needs to have the same row value as the first event.
2. All columns store doubles. You don't need to store strings in this case, since all your columns report numbers.
3. All columns update when the row is added or updated by events. There's no reason to have any "when accessed" columns in this case.
4. The first two columns have a Row Add value. The second two columns have an Event Value.
5. The second two columns are updated by the second event.

Consider looking at this very similar tutorial:
https://docs.flexsim.com/en/22.1/Tutorials/AdditionalTools/Tutorial2StatsCollector/2-6PickTimeByType/2-6PickTimeByType.html

The only difference is that the tutorial records a Type column, but you would change that to a Patient ID column.

You may also be interested in this article on how the statistics collector works, visualized as an AGV:
https://answers.flexsim.com/articles/105427/visualizing-the-logic-of-the-statistics-collector.html