Let's say a patron has duplicate accounts, account #1 and account #2, with the following data: lastseen Account #1 2024-05-01 Account #2 2024-11-15 Let's say a staff member merges the duplicate accounts and chooses to keep account #1 based on whatever criteria they use to decide. Currently, account #1 would keep its lastseen date of 2024-05-01. Since the lastseen date may be used to determine account retention and automatic renewal, it would make more sense to keep the more recent lastseen date in this case, especially for patrons who use the library relatively infrequently. (As an extreme example, I recently found a patron account in our system that has a lastseen date from 5 years ago yet also still has current checkouts from earlier this year!)