[Koha] Data migration: importing of anonymous checkout history

Hello! I have a checkout history over the past years. But some of the patrons have already been deleted. What do I need to do to import anonymizing the checkout history? In other words, if there is a user, then the story is personalized, if there is no user, then the story is impersonal. Good Luck! Igor A. Sychev Tomsk Polytechnic University https://lib.tpu.ru