test: wait on the API view before asserting checkout expiry

The waiter polled Postgres, which the handler updates before the refresh
middleware drops the cached subject, so customers.get could still serve
the plan for a few ms after the predicate resolved. Poll the cache-backed
API view instead and assert the DB row afterwards.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EUxZ3wtxSsZ1nC9YrPwjG1

Author: claude

server/tests/integration/billing/attach/checkout/stripe-checkout/stripe-checkout-enable-plan-immediately.test.ts

@@ -211,28 +211,32 @@ test.concurrent(`${chalk.yellowBright("stripe-checkout enable_plan_immediately:
 	expect(before.some((cp) => cp.product.id === pro.id)).toBe(true);
 
 	// 2. Abandon the checkout: expire the session on Stripe, which emits
-	// `checkout.session.expired`, then wait for Autumn to expire the row.
+	// `checkout.session.expired`. Wait on the cache-backed API view, not the
+	// DB row: the handler expires the row first and the refresh middleware
+	// drops the cached subject after it returns, so a DB-only predicate can
+	// resolve before `customers.get` stops reporting the plan.
 	await ctx.stripeCli.checkout.sessions.expire(checkoutSessionId!);
 
-	const isProActiveInDb = async () => {
-		const active = await CusProductService.list({
-			db: ctx.db,
-			internalCustomerId,
-			inStatuses: [CusProductStatus.Active],
-		});
-		return active.some((cp) => cp.product.id === pro.id);
+	const isProActiveInApi = async () => {
+		const customer = await autumnV1.customers.get<ApiCustomerV3>(customerId);
+		return (customer.products ?? []).some((product) => product.id === pro.id);
 	};
 
 	await waitForStripeWebhook({
 		stripeCli: ctx.stripeCli,
 		env: ctx.env,
 		types: ["checkout.session.expired"],
 		objectId: checkoutSessionId!,
-		until: async () => !(await isProActiveInDb()),
+		until: async () => !(await isProActiveInApi()),
 	});
 
 	// 3. After expiry: cusProduct should no longer be Active.
-	expect(await isProActiveInDb()).toBe(false);
+	const after = await CusProductService.list({
+		db: ctx.db,
+		internalCustomerId,
+		inStatuses: [CusProductStatus.Active],
+	});
+	expect(after.some((cp) => cp.product.id === pro.id)).toBe(false);
 
 	// API view: pro is not active.
 	const customerAfter = await autumnV1.customers.get<ApiCustomerV3>(customerId);