I just stumbled upon a behavior I didn’t have on my radar and that surprised me.
I created an add row action and within the action, Column A is written to. So column A is being used (according to me).
Now back in the data editor, I happened to run “Find Uses” on column A and it appears to have no uses. It is true that Column A isn’t directly used by a component on the layout editor (nor indirectly), nor is it used directly or indirectly by another column in the data editor. However I would consider that it is being used by an action, and yet according to “Find Uses”, it isn’t.
Is this expected behavior?