It would be useful to have an automated process for adjusting items.replacement price based on age -- some libraries do not wish to charge the full purchase price for an item that's older.

At its simplest, this could be just

UPDATE items SET replacementprice=(replacementprice * X) WHERE replacementpricedate < date_sub(curdate(),interval Y day);

With X and Y set in flags on a cronjob.

We could go one better and add a syspref to allow those values to be set within the staff interface.

Or we could do better still and add a more complicated syspref to take some YAML defining different X and Y values per itemtype.