A seeding node fetches a range over one NNTP connection, parses headers with the live rules, groups them into files in memory (lib/aggregate) and stores per complete file its release, the file and a completed binary (SeedService), instead of one parts row per article. What doesn't complete within the window goes through the regular ingest path as fragments. `--dry-run` only fetches and aggregates, to measure a node. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>