Data API supports a new filter option: UpdateFilter. This filter can be used to filter items by changes to a specified metadata field value made after a specified date. It allows users to identify items which may have been republished with quality improvements or fixes, enabling them to keep internal catalogs up-to-date and make more informed redownload decisions. You can read more on this filter type here: https://developers.planet.com/docs/data/searches-filtering/#updatefilter