Add configurable history and storage retention policies

src/lib/server/hosts/calibration.ts

@@ -1,3 +1,4 @@
+import { fleetSettings } from '../settings.js';
 import { db } from '../db/index.js';
 import { ensureHostSchema } from './schema.js';
 import type { CapacityCalibration, CapacitySample, CapacitySamplePage, HostInventory, ResourceAllowance } from '../../hosts.js';
@@ -89,8 +90,8 @@ export function recordInstanceResources(hostId: string, inventory: HostInventory
                 cpu_cores=excluded.cpu_cores,memory_bytes=excluded.memory_bytes,samples=excluded.samples,
                 window_start=excluded.window_start,observed_at=excluded.observed_at,computed_at=excluded.computed_at`)
                 .run(scope, phase, cpu, memory, rows.length, rows.at(-1)!.bucket, timestamp, timestamp);
-            if (scope === '*') handle.prepare('DELETE FROM ec_instance_resource_samples WHERE bucket<?')
-                .run(new Date(Date.parse(timestamp) - WINDOW_MS).toISOString());
+            if (scope === '*' && fleetSettings().instanceResourceKeepDays) handle.prepare('DELETE FROM ec_instance_resource_samples WHERE bucket<?')
+                .run(new Date(Date.parse(timestamp) - Math.max(WINDOW_MS, fleetSettings().instanceResourceKeepDays * 86400_000)).toISOString());
         } else {
             // Raise the allowance immediately on a new peak; a lower sample
             // cannot reduce it until the next scheduled percentile calculation.