- Core.AlarmHistorian-008: cache queue depth in an Interlocked counter so EnqueueAsync no longer runs COUNT(*) on every alarm; consolidate DrainOnceAsync onto a single SqliteConnection per tick (purge, batch read, dead-letter, and outcome transaction all share it). - Core.AlarmHistorian-011: confirm the stale Galaxy.Host XML doc references were already fixed under earlier commits; flip to Resolved. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>