Introduce a defined lifespan for trial sites - 6 months from creation, or 30 days for live sites downgraded after subscription cancellation - after which a backup is created (retained 180 days), and the site is removed. Live, Template, and upgraded (to v7) sites are exempt. Adds an Expires in column with a tooltip, expiration-based email notifications 30 days before deletion, updated cancellation messaging, and lifespan-aware site copying.