Rebuild spec: homelab measurements

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

REBUILD.md

@@ -29,6 +29,15 @@ search. Measured on the workstation (4 cores, 100 Mbit, Eweka):
   each; server side ~17% (coordinator) + ~8% (web) + ~3% (Postgres) of a
   core. (Before this round's fixes Postgres was at 32%: the merger's
   neighbour query read every range per file.)
+- On homelab (12 cores, 1 Gbit; 2026-10-09, separate containers and
+  database, `/mnt/bulk/usenet-rebuild`): 20 connections fetched ~630 k
+  articles/s (~31 k per connection, ~3 s per 100 k chunk, ~250 Mbit/s at
+  ~50 B per article on older boneless) and 8 worker processes indexed all of
+  it, waiting for the spool (~366 M headers in ~12 minutes). Server side at
+  that rate: coordinator 0.4–0.5 cores (1.3–1.7 before it stopped
+  inflating replies to check them), web 0.3–0.45, Postgres (on the HDD)
+  under 0.15. Worker per core there: ~195 k headers/s (boneless 2026),
+  ~275 k (ath 2013).
 - Storage: chunks 17.9–20.3 B per segment (format v2); a release ~1.1 KB.
 - For the whole target (528 B overview lines): ~36 TB of compressed XOVER
   to download. At 50 connections (~1–1.25 M lines/s, ~0.6–0.7 Gbit/s)