Bug 18626 introduced the logging of changes to patron cardnumbers which is great, but this still does not link together previous cardnumbers. Imagine this scenario: A library patron loses their library card. They are issued with a replacement. Old and new cardnumbers are recorded in the Modification log. The old card is found (doesn't matter who finds it) and brought to the library. A member of library staff scan the barcode - get no results. This means they are none the wiser as to who this card belonged to. Would it not be a good idea to allow previous cardnumbers to be searchable? Some libraries may record this information somewhere in the patron record, but a search by cardnumber would be extremely helpful. It would be useful if the cardnumber moved into a linked field automatically when a new cardnumber was entered.