The spool only fetches what workers lease soon, in priority order, and the tail never ends: after a reset the 1,400 capture ranges waited behind it while 34 of 40 connections idled. Up to CORPUS_AHEAD (8) planned capture ranges whose chunks aren't all stored are now targets after everything else, fetched into the corpus only (no spool); a later lease reads them from disk. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>