Incremental Memory Cache Database (Multi-Part OA)

Problem

A multi-part OA that builds incrementally: start with set/get, then add TTL expiry, then transactions/rollback, then a scan/filter query — each part building on the last.

Example

Part 1: set/get; Part 2: set with TTL; Part 3: begin/commit/rollback

Constraints

• Each part adds requirements; keep earlier parts working

What to look for

Catch all edge cases and run tests. Communicate and ask clarifying questions.