Onboarding

__tests__/server/authAccountDeletion.test.js

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+jest.mock('../../server/lib/postgres', () => ({
+  get: jest.fn(),
+  run: jest.fn(),
+}));
+
+const { get, run } = require('../../server/lib/postgres');
+const { deleteAccount, signUp } = require('../../server/lib/auth');
+
+describe('server auth account deletion', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    get.mockResolvedValue(null);
+    run.mockResolvedValue({ lastId: null, changes: 1, rows: [] });
+  });
+
+  it('removes auth and billing rows so the same email can sign up again', async () => {
+    const email = 'same@example.com';
+
+    await signUp({}, email, 'First User', 'password-1');
+    await deleteAccount({}, 'usr_deleted');
+    await signUp({}, email, 'Second User', 'password-2');
+
+    const authDeletes = run.mock.calls.filter(([, sql]) => (
+      typeof sql === 'string' && sql.includes('DELETE FROM auth_users')
+    ));
+    expect(authDeletes).toHaveLength(1);
+
+    const billingAccountDeletes = run.mock.calls.filter(([, sql]) => (
+      typeof sql === 'string' && sql.includes('DELETE FROM billing_accounts')
+    ));
+    expect(billingAccountDeletes).toHaveLength(1);
+
+    const signupChecks = get.mock.calls.filter(([, sql], params) => (
+      typeof sql === 'string'
+      && sql.includes('SELECT id FROM auth_users WHERE LOWER(email)')
+      && params?.[0] === email
+    ));
+    expect(signupChecks).toHaveLength(2);
+  });
+});