An initial population of untity_usage could be done based on the item_per_site. However, we have to decide whether we should mark the linked items as being used wrt the "sitelinks" aspect only (they all are), or wrt the "all" aspect (which only a few actually are). determining the *correct* aspect requires re-parsing the pages.
Version: unspecified
Severity: normal
Whiteboard: u=dev c=backend p=5