A one-time data export is useful. A dataset that updates itself every day, without you touching anything, is something else entirely. Most people who start collecting web data think about it as a single task: go to a page, grab the data, export it. That works fine when you need a snapshot. But a lot of the most valuable information on the web is not static. Prices change. Job postings appear and disappear. Property listings update. Rankings shift. If you only pull the data on