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How to Increment a Card Stack

I have an app where I have a card stack and I want to make it so when Current User passes on a card in the deck, it sends that card to the bottom of the pile so it is less likely that they will encounter that person again the next time they load the app. Any idea how I should be organizing the database and workflows for this?

How about this -
You can keep a list associated with the user for what cards they already saw.
In the repeating group of the stack have a rule to exclude cards that the user already saw
Have another rule to empty the list if the stack is empty or close to it