In-Memory Record Store with Timestamp and TTL

Problem: In-Memory Record Store with Timestamp and TTL (Level 3) Extend the previous in-memory record store to support timestamps and time-to-live (TTL). Extended Semantics You must incorporate write time and expiration into the existing add/remove/scan operations: Each write/update includes a timestamp. A record may have a ttl (time to live). During reads/scans, determine whether a record is expired based on the prompt’s rule (commonly something like: expired if now >= write_ts + ttl). Expired records should be treated as not visible. Requirements Implement the additional functions required by the prompt/template (exact function list was not included in the post). All operations must produce correct outputs under TTL expiration rules. Constraints and I/O Follow the OA harness for function signatures, input/output format, and constraints (not provided in the shared text).