Turn this on for daily or recurring monitoring. The first run returns all matching businesses as NEW. Later runs normally return only NEW, UPDATED, and REAPPEARED businesses. A business is UPDATED when any returned field changes (name, phone, address, categories, rating, reviews, images, claimed status and so on); changedFields names them. Never compared: scrapedFromPage (which page it was found on) and the rotating image-server number in photo links and the placeholder-icon number, plus any field you list in Ignore fields. If a detail fetch fails on a re-run, the last known detail data is kept so it does not read as a change. Turn on "Emit unchanged" or "Emit expired" only when you also want those businesses returned (and billed). State is kept separately for each mode/businessType/location/URL and detail-mode setup; use State key when you want to name or deliberately share a monitoring campaign. To continue one specific interrupted run instead, use Resume from a previous run above.