feat(devices): hourly scan-cycle orchestration + cron

tests/infra/scan_cycle.test.js

@@ -0,0 +1,32 @@
+// tests/infra/scan_cycle.test.js
+import { describe, it, expect, vi } from 'vitest';
+import { runDeviceScanCycle } from '../../lib/infra/scan_cycle.js';
+
+function fakeRepo() {
+  return {
+    calls: [],
+    upsertScan: vi.fn(async r => r.length),
+    markAbsent: vi.fn(async () => 1),
+    prune: vi.fn(async () => 2)
+  };
+}
+
+describe('runDeviceScanCycle', () => {
+  it('scan→upsert→markAbsent→prune on a non-empty scan', async () => {
+    const repo = fakeRepo();
+    const scan = vi.fn(async () => [{ mac: 'aa:bb:cc:dd:ee:ff', ip: '1.2.3.4', vendor: 'x', randomized: false }]);
+    const res = await runDeviceScanCycle({ scan, repo });
+    expect(repo.upsertScan).toHaveBeenCalledOnce();
+    expect(repo.markAbsent).toHaveBeenCalledWith(['aa:bb:cc:dd:ee:ff']);
+    expect(repo.prune).toHaveBeenCalledOnce();
+    expect(res).toEqual({ seen: 1, pruned: 2 });
+  });
+
+  it('skips upsert/prune when the scan returns nothing', async () => {
+    const repo = fakeRepo();
+    const res = await runDeviceScanCycle({ scan: async () => [], repo });
+    expect(repo.upsertScan).not.toHaveBeenCalled();
+    expect(repo.prune).not.toHaveBeenCalled();
+    expect(res).toEqual({ seen: 0 });
+  });
+});