This might be a little specific, but I am proposing that the item due date should be stored as part of the check-in transaction in the Transactions Database in SQL.

Idea Value
This seems like a relatively small change to the SQL tables, but it would allow some information to be more easily gathered. For instance, I recently received a question where I was trying to determine if there's any trend in what triggers the return of overdue material (e.g. first/second notice, the bill, or collections). If the due date was included in the check-in transaction, I think I would be able to run a report to see how many days overdue items were returned and draw some conclusions from that. I think this would also be useful for libraries who have recently gone fine free or are considering going fine free.