CDX status timeline dates a page takedown precisely

To find when a page disappeared, query the CDX API for the exact URL with fl=timestamp,statuscode&limit=200, then reduce it to month and status: awk '{print substr($1,1,6), $2}' | sort -u. The switch from 200 to 404/301 gives the takedown month. Take the first timestamp per month with a 200 and scrape each to sweep all page versions, grepping for target names. Wide queries with filter=original:.*(?i)... regexes through a scraper returned an empty document or scrape failures, while plain url=host/path* wildcards with collapse=urlkey returned results.