fix: purge deleted-stack notifications from panel and ticker (#1674)

* fix: purge deleted-stack notifications from panel and ticker

Stack delete already cascaded scans and drift but left notification_history rows, so the bell and Activity ticker kept showing the deleted stack. Purge those rows in the shared deletion lifecycle, invalidate connected clients, and drop node-scoped in-memory rows immediately.

* fix: target remote notification purge by hub node id

Remote stack-deleted invalidations always reconcile with hub rn.id, and
notification refetch preserves failed node slices instead of wiping them.

backend/src/__tests__/stack-delete-purges-notifications.test.ts

@@ -0,0 +1,132 @@
+/**
+ * DELETE /api/stacks/:stackName must purge notification_history for that
+ * (node_id, stack_name) so the bell panel, Activity ticker, Stack Activity,
+ * and Networking recent activity no longer show the deleted stack.
+ */
+import { describe, it, expect, beforeAll, afterAll, beforeEach, vi } from 'vitest';
+import request from 'supertest';
+import { setupTestDb, cleanupTestDb, loginAsTestAdmin } from './helpers/setupTestDb';
+
+let tmpDir: string;
+let app: import('express').Express;
+let DatabaseService: typeof import('../services/DatabaseService').DatabaseService;
+let ComposeService: typeof import('../services/ComposeService').ComposeService;
+let FileSystemService: typeof import('../services/FileSystemService').FileSystemService;
+let MeshService: typeof import('../services/MeshService').MeshService;
+let NotificationService: typeof import('../services/NotificationService').NotificationService;
+let adminCookie: string;
+
+beforeAll(async () => {
+  tmpDir = await setupTestDb();
+  ({ DatabaseService } = await import('../services/DatabaseService'));
+  ({ ComposeService } = await import('../services/ComposeService'));
+  ({ FileSystemService } = await import('../services/FileSystemService'));
+  ({ MeshService } = await import('../services/MeshService'));
+  ({ NotificationService } = await import('../services/NotificationService'));
+  ({ app } = await import('../index'));
+  adminCookie = await loginAsTestAdmin(app);
+});
+
+afterAll(() => cleanupTestDb(tmpDir));
+
+beforeEach(() => {
+  vi.restoreAllMocks();
+  vi.spyOn(ComposeService.prototype, 'downStack').mockResolvedValue(undefined);
+  vi.spyOn(FileSystemService.prototype, 'deleteStack').mockResolvedValue(undefined);
+  vi.spyOn(MeshService.getInstance(), 'optOutStack').mockResolvedValue(undefined);
+  const raw = DatabaseService.getInstance().getDb();
+  raw.prepare('DELETE FROM notification_history').run();
+});
+
+function seedNotif(
+  nodeId: number,
+  opts: { stack_name?: string; message?: string; timestamp?: number },
+): void {
+  DatabaseService.getInstance().addNotificationHistory(nodeId, {
+    level: 'error',
+    message: opts.message ?? 'test',
+    timestamp: opts.timestamp ?? Date.now(),
+    stack_name: opts.stack_name ?? 'web',
+    category: 'deploy_failure',
+  });
+}
+
+function stackNamesForNode(nodeId: number): Array<string | null> {
+  const rows = DatabaseService.getInstance()
+    .getDb()
+    .prepare('SELECT stack_name FROM notification_history WHERE node_id = ? ORDER BY id')
+    .all(nodeId) as Array<{ stack_name: string | null }>;
+  return rows.map((r) => r.stack_name);
+}
+
+describe('DELETE /api/stacks/:stackName purges notifications', () => {
+  it('removes only the target node/stack rows and emits one invalidation', async () => {
+    const db = DatabaseService.getInstance();
+    const nodeA = db.getNodes()[0].id;
+    const nodeB = db.addNode({
+      name: 'other-node',
+      type: 'remote',
+      api_url: 'http://other:1852',
+      api_token: 't',
+      compose_dir: '/tmp',
+      is_default: false,
+    });
+
+    seedNotif(nodeA, { stack_name: 'web', message: 'a-web' });
+    seedNotif(nodeA, { stack_name: 'db', message: 'a-db' });
+    // Unattached (null stack_name) via SQL; addNotificationHistory omits null.
+    db.getDb()
+      .prepare(
+        `INSERT INTO notification_history (node_id, level, message, timestamp, is_read, stack_name, category)
+         VALUES (?, 'info', 'a-unattached', ?, 0, NULL, 'system')`,
+      )
+      .run(nodeA, Date.now());
+    seedNotif(nodeB, { stack_name: 'web', message: 'b-web' });
+
+    const broadcastSpy = vi.spyOn(NotificationService.getInstance(), 'broadcastEvent');
+
+    const res = await request(app).delete('/api/stacks/web').set('Cookie', adminCookie);
+
+    expect(res.status).toBe(200);
+    expect(stackNamesForNode(nodeA).sort((a, b) => String(a).localeCompare(String(b)))).toEqual([
+      'db',
+      null,
+    ]);
+    expect(stackNamesForNode(nodeB)).toEqual(['web']);
+
+    const notifInvalidations = broadcastSpy.mock.calls
+      .map((c) => c[0])
+      .filter(
+        (e) =>
+          e.type === 'state-invalidate' &&
+          e.scope === 'notifications' &&
+          e.action === 'stack-deleted',
+      );
+    expect(notifInvalidations).toHaveLength(1);
+    expect(notifInvalidations[0]).toMatchObject({
+      type: 'state-invalidate',
+      scope: 'notifications',
+      action: 'stack-deleted',
+      nodeId: nodeA,
+      stackName: 'web',
+    });
+    expect(typeof notifInvalidations[0].ts).toBe('number');
+  });
+
+  it('emits no notification invalidation when delete fails before success', async () => {
+    vi.spyOn(FileSystemService.prototype, 'deleteStack').mockRejectedValue(new Error('fs boom'));
+    const broadcastSpy = vi.spyOn(NotificationService.getInstance(), 'broadcastEvent');
+    const db = DatabaseService.getInstance();
+    const nodeId = db.getNodes()[0].id;
+    seedNotif(nodeId, { stack_name: 'web' });
+
+    const res = await request(app).delete('/api/stacks/web').set('Cookie', adminCookie);
+
+    expect(res.status).toBe(500);
+    expect(stackNamesForNode(nodeId)).toEqual(['web']);
+    const notifInvalidations = broadcastSpy.mock.calls
+      .map((c) => c[0])
+      .filter((e) => e.scope === 'notifications' && e.action === 'stack-deleted');
+    expect(notifInvalidations).toHaveLength(0);
+  });
+});