[otrs] GenericAgent time since ticket moved or last action

Hi I am trying to write (command line) a GenericAgent to automatically close tickets that are in a 'complete' folder once they have been in that folder for 1 week. but I cannot find the keyword for TimeSinceLastAction or TimeSinceMoved or something like that the tickets can be over 18 days old and still active in other queues. I can only calculate time from when they were moved into the 'complete' queue. and at this point after 7 days tickets would be locked and unlocked states. does anyone know the keyword I need or even a list of the keywords available, i havnt been able to find a definitive list thanks steven