Collapse filing sync notifications into one batch surface

lib/server/api/task-workflow-hybrid.e2e.test.ts

@@ -467,6 +467,60 @@ if (process.env.RUN_TASK_WORKFLOW_E2E === '1') {
     expect(task.payload.tags).toEqual(['semis', 'ai']);
   });
 
+  it('reuses the same in-flight filing sync task for repeated same-ticker requests', async () => {
+    const first = await jsonRequest('POST', '/api/filings/sync', {
+      ticker: 'NVDA',
+      limit: 20
+    });
+    const second = await jsonRequest('POST', '/api/filings/sync', {
+      ticker: 'nvda',
+      limit: 20
+    });
+
+    expect(first.response.status).toBe(200);
+    expect(second.response.status).toBe(200);
+
+    const firstTask = (first.json as { task: { id: string } }).task;
+    const secondTask = (second.json as { task: { id: string } }).task;
+
+    expect(secondTask.id).toBe(firstTask.id);
+
+    const tasksResponse = await jsonRequest('GET', '/api/tasks?limit=10&status=queued&status=running');
+    expect(tasksResponse.response.status).toBe(200);
+
+    const tasks = (tasksResponse.json as {
+      tasks: Array<{ id: string; task_type: string; payload: { ticker?: string } }>;
+    }).tasks.filter((task) => task.task_type === 'sync_filings' && task.payload.ticker === 'NVDA');
+
+    expect(tasks).toHaveLength(1);
+  });
+
+  it('lets different tickers queue independent filing sync tasks', async () => {
+    const nvda = await jsonRequest('POST', '/api/filings/sync', { ticker: 'NVDA', limit: 20 });
+    const msft = await jsonRequest('POST', '/api/filings/sync', { ticker: 'MSFT', limit: 20 });
+    const aapl = await jsonRequest('POST', '/api/filings/sync', { ticker: 'AAPL', limit: 20 });
+
+    const ids = [
+      (nvda.json as { task: { id: string } }).task.id,
+      (msft.json as { task: { id: string } }).task.id,
+      (aapl.json as { task: { id: string } }).task.id
+    ];
+
+    expect(new Set(ids).size).toBe(3);
+
+    const tasksResponse = await jsonRequest('GET', '/api/tasks?limit=10&status=queued&status=running');
+    expect(tasksResponse.response.status).toBe(200);
+
+    const syncTickers = (tasksResponse.json as {
+      tasks: Array<{ task_type: string; payload: { ticker?: string } }>;
+    }).tasks
+      .filter((task) => task.task_type === 'sync_filings')
+      .map((task) => task.payload.ticker)
+      .filter((ticker): ticker is string => typeof ticker === 'string');
+
+    expect(syncTickers.sort()).toEqual(['AAPL', 'MSFT', 'NVDA']);
+  });
+
   it('scopes the filings endpoint by ticker while leaving the global endpoint mixed', async () => {
     if (!sqliteClient) {
       throw new Error('sqlite client not initialized');