Can AI replace FareHarbor?

Build a self-hosted booking system for a single tour operator. Stack: Next.js 15 with the App Router, TypeScript, Tailwind, Postgres via Prisma, Stripe Checkout. No auth provider, no analytics, no telemetry.

Data model: Product (name, slug, description, duration minutes, base price cents, currency, min and max party size, active flag), Departure (product, start datetime, capacity, status: scheduled | cancelled), Booking (departure, lead name, email, phone, party size, amount cents, stripe payment intent id, status: pending | confirmed | cancelled | refunded, notes, waiver accepted at), Passenger (booking, name, age band).

Public side:
- /tours lists active products, /tours/[slug] shows the next 60 days of departures with seats remaining computed as capacity minus confirmed and pending party sizes.
- Booking flow: pick a departure, enter party size and lead contact, tick a waiver checkbox, then redirect to Stripe Checkout. Create the Booking as pending before redirect. Confirm it only in the Stripe webhook handler, never on the return URL.
- Overselling is the thing you must get right: take the seat hold inside a serialisable transaction that re-checks remaining capacity, and expire pending bookings older than 20 minutes with a cron route.

Operator side at /admin, protected by a single shared password from .env stored in an httpOnly cookie:
- Day view manifest: every departure today with lead names, party sizes, phone numbers, waiver status and a check-in toggle.
- Create and bulk-generate departures from a weekday recurrence rule with a date range.
- Cancel a departure: refunds all confirmed bookings through the Stripe API and emails everyone.
- Manual booking entry for phone and walk-up guests, marked as unpaid or cash.
- CSV export of bookings for a date range.

Email confirmations and cancellations via Resend, plain text, with an .ics attachment. Money in integer cents, one currency, store all times in UTC and render in a single operator timezone from .env.

Explicitly out of scope: OTA or reseller channel sync, promo codes, gift cards, multi-day itineraries, guide and equipment assignment, multi-currency, per-user accounts and roles.

Secrets in .env: DATABASE_URL, STRIPE_SECRET_KEY, STRIPE_WEBHOOK_SECRET, RESEND_API_KEY, ADMIN_PASSWORD, OPERATOR_TIMEZONE. Ship a seed script with two products and 30 days of departures, a README with the Stripe CLI webhook command, and a test that proves a departure cannot be oversold under concurrent requests.