What is pulled: daily performance rows by date, query, page, country and device, plus search appearance and sitemap data.
Freshness: final data is about 3 days behind. Newer days are provisional.
Row cap: about 50,000 rows per day per search type per property for one dimension request, ordered by clicks. The long tail beyond it is not returned.
History on connect: Free 3 months, Starter 16, Pro and Agency 16 and 25.
Coverage: the ledger compares stored rows with the reported totals and shows the gap.