{"blocks": [{"key": "b39d96f6", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "a3dde90e", "text": "Design a ticket-booking system where a reserved ticket automatically returns to the inventory if payment is not completed within 30 minutes. Discuss data model, reservation flow, concurrency handling, timeout processing, and consistency guarantees.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}