fix(airtrail): add back missing tests

server/tests/unit/services/airtrailWriteback.test.ts

@@ -0,0 +1,38 @@
+import { describe, it, expect, vi } from 'vitest';
+
+// Avoid any real DNS/network from the SSRF guard during saveSettings.
+vi.mock('../../../src/utils/ssrfGuard', () => ({
+  checkSsrf: vi.fn(async () => ({ allowed: true, isPrivate: false })),
+  safeFetch: vi.fn(),
+}));
+
+import { db } from '../../../src/db/database';
+import { createUser } from '../../helpers/factories';
+import {
+  getConnectionSettings,
+  isAirtrailWriteEnabled,
+  saveSettings,
+} from '../../../src/services/airtrail/airtrailService';
+
+describe('airtrail writeback opt-in persistence (#1240)', () => {
+  it('defaults the writeback opt-in to off for a new user', () => {
+    const { user } = createUser(db);
+    expect(isAirtrailWriteEnabled(user.id)).toBe(false);
+    expect(getConnectionSettings(user.id).writeEnabled).toBe(false);
+  });
+
+  it('persists the opt-in and lets it be toggled back off without dropping the key', async () => {
+    const { user } = createUser(db);
+
+    await saveSettings(user.id, 'https://at.example.com', 'secret-key', false, true, null);
+    expect(isAirtrailWriteEnabled(user.id)).toBe(true);
+    const on = getConnectionSettings(user.id);
+    expect(on.writeEnabled).toBe(true);
+    expect(on.connected).toBe(true); // key stored
+
+    // No key supplied keeps the stored key; only the opt-in flips back off.
+    await saveSettings(user.id, 'https://at.example.com', undefined, false, false, null);
+    expect(isAirtrailWriteEnabled(user.id)).toBe(false);
+    expect(getConnectionSettings(user.id).connected).toBe(true);
+  });
+});