Add configurable history and storage retention policies

tests/helpers/settings.ts

@@ -0,0 +1,8 @@
+import type Database from 'better-sqlite3';
+import { defaultFleetSettings } from '../../src/lib/fleet-settings.js';
+export function initializeStandaloneSettings(handle: Database.Database) {
+    handle.exec(`CREATE TABLE IF NOT EXISTS settings (key TEXT PRIMARY KEY,value TEXT NOT NULL);
+        CREATE TABLE IF NOT EXISTS retention_controls (category TEXT NOT NULL,record_id TEXT NOT NULL,protected INTEGER NOT NULL DEFAULT 0,resolved_at TEXT,PRIMARY KEY(category,record_id));
+        CREATE TABLE IF NOT EXISTS retention_expirations (category TEXT NOT NULL,record_id TEXT NOT NULL,expired_at TEXT NOT NULL,PRIMARY KEY(category,record_id));`);
+    handle.prepare("INSERT OR IGNORE INTO settings(key,value) VALUES('fleet_settings',?)").run(JSON.stringify(defaultFleetSettings));
+}