KIP-165 — Extend Interactive Queries for return latest update timestamp per key

Discarded Streams

KIP-165 (discarded, covered by later KIPs) proposed adding `ReadOnlyKeyValueStoreWithKeyContext` and a `KeyContext` wrapper exposing the `lastUpdated` timestamp alongside the value from Kafka Streams state store queries. Without it, callers cannot distinguish stale from fresh values when querying a store because the retrieval API returns only the raw value with no metadata about when it was last written.

Details