Multi-threaded Recursive Data Deletion with Dependencies

Problem Overview

Given a data entity that has recursive dependencies (e.g., a user deletes a post, which must also delete all comments on that post, all attachments on those comments, and any further nested dependencies), design and implement a solution that cascades the deletion…

• 4 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
• The rest of the problem statement — full requirements, constraints, and edge cases
• Approach and trade-offs — what passing candidates did, and the mistakes that sink people