In-Memory Database

Problem Overview

Implement a toy in-memory database (using only the standard library, no frameworks) with progressively harder levels, each building on the previous: Level 1 – Basic key-field-value operations: - set(key: str, field: str, value: str) -> None — store a value under a two-level map (record key → field → value)…

• 3 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