Handle large WeebCentral catalogs and correct MangaPill checkpoint monitoring

sentinel/test/monitor.test.js

@@ -24,3 +24,15 @@ test('Sentinel reports service failures without restart loops and resolves recov
   await monitor.observe({ ok: true }, { active: [], queue: [], paused: false });
   assert.equal(monitor.state.status, 'healthy'); assert.ok(monitor.incidents.every(i => i.state === 'resolved'));
 });
+
+test('missing checkpoint does not trigger a false stall recovery', async () => {
+  let now = 0, recoveries = 0;
+  const monitor = new Monitor({ now: () => now, stallMs: 100 });
+  const state = { paused: false, active: [{ source: 'mangapill', current: { id: 'job', title: 'Manga' }, job: null }], queue: [] };
+  for (const advance of [0, 1000000, 2000000]) {
+    now = advance;
+    await monitor.observe({ ok: true }, state, async () => { recoveries++; return { changed: true }; });
+  }
+  assert.equal(recoveries, 0);
+  assert.equal(monitor.incidents.some(item => item.key === 'stall:job'), false);
+});