Handle large WeebCentral catalogs and correct MangaPill checkpoint monitoring

sentinel/monitor.js

@@ -36,6 +36,9 @@ class Monitor {
     const ids = new Set();
     for (const entry of scraper.active || []) {
       const id = entry.current.id; ids.add(id);
+      // Without a checkpoint, a null progress key stays constant forever and
+      // cannot prove a stall. Do not quarantine a live worker on that basis.
+      if (!entry.job) { this.observations.delete(id); this.resolve(`stall:${id}`); continue; }
       const key = progressKey(entry.job), prior = this.observations.get(id);
       if (!prior || prior.key !== key) { this.observations.set(id, { key, at: now }); this.resolve(`stall:${id}`); continue; }
       if (scraper.paused || scraper.sourcePaused?.[entry.source]) continue;

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);
+});