Add configurable retention for successful routine operations

src/lib/server/pipeline/sweep.ts

@@ -2,6 +2,7 @@ import { fleetSettings } from '../settings.js';
 import { db } from '../db/index.js';
 import { emit } from './bus.js';
 import { requestRestart } from '../provisioning/index.js';
+import { pruneHostObservations } from '../hosts/index.js';
 
 interface PendingRow {
     deployment_id: string; server: string; restart_state: string;
@@ -18,6 +19,7 @@ export function sweep(): Promise<SweepResult> {
     return sweepInFlight;
 }
 async function runSweep(): Promise<SweepResult> {
+    pruneHostObservations();
     const pending = db().prepare(`SELECT ds.* FROM deployment_servers ds JOIN deployments d ON d.id = ds.deployment_id
         WHERE ds.server_deleted_at IS NULL AND ds.restart_state IN ('pending','failed') ORDER BY d.started_at, d.id, ds.server`).all() as PendingRow[];
     const result: SweepResult = { checked: 0, restarted: 0, healthy: 0, held: 0, failed: 0 };