fix: add datetime validation to ISO date fields, remove hasActiveSubscription

- Add z.string().datetime() validation to currentPeriodStart, currentPeriodEnd
  in SubscriptionSchema and CustomerSubscriptionSchema
- Remove hasActiveSubscription from CustomerSchema as it can be derived
  from subscriptions array client-side

Author: NatElkins

src/schemas/customer.ts

@@ -13,8 +13,8 @@ export const CustomerSubscriptionSchema = z.object({
 	id: z.string(),
 	productId: z.string(),
 	status: SubscriptionStatusSchema,
-	currentPeriodStart: z.string(), // ISO date
-	currentPeriodEnd: z.string(), // ISO date
+	currentPeriodStart: z.string().datetime(),
+	currentPeriodEnd: z.string().datetime(),
 	cancelAtPeriodEnd: z.boolean().optional(),
 	amount: z.number(),
 	currency: CurrencySchema,
@@ -31,7 +31,6 @@ export const CustomerSchema = z.object({
 	name: z.string().nullable().optional(),
 	externalId: z.string().nullable().optional(),
 	subscriptions: z.array(CustomerSubscriptionSchema),
-	hasActiveSubscription: z.boolean(),
 });
 
 /**

src/schemas/subscription.ts

@@ -18,13 +18,13 @@ export const SubscriptionSchema = z.object({
 	currency: CurrencySchema,
 	recurringInterval: RecurringIntervalSchema,
 	status: SubscriptionStatusSchema,
-	currentPeriodStart: z.string(), // ISO date
-	currentPeriodEnd: z.string(), // ISO date
+	currentPeriodStart: z.string().datetime(),
+	currentPeriodEnd: z.string().datetime(),
 	cancelAtPeriodEnd: z.boolean().optional(),
-	endsAt: z.string().optional(), // ISO date (if scheduled to end)
-	endedAt: z.string().optional(), // ISO date (if ended)
-	canceledAt: z.string().optional(), // ISO date (if canceled)
-	startedAt: z.string(), // ISO date
+	endsAt: z.string().datetime().optional(),
+	endedAt: z.string().datetime().optional(),
+	canceledAt: z.string().datetime().optional(),
+	startedAt: z.string().datetime(),
 });
 
 export const SubscriptionWebhookEventSchema = z.enum([