Design a movie ticketing system like BookMyShow

Problem

Design a movie ticketing system like BookMyShow. A full low-level design exercise: class diagram, entities, and relationships.

Requirements

• Cities, theatres, screens, shows, and seats
• Search shows by movie, city, and time
• Seat selection, booking, and payment

Discussion points

• Core classes and their relationships
• Preventing double-booking of the same seat (concurrency/locking)
• Data model for shows, seat inventory, and bookings