KIP-326 — Schedulable KTable as Graph source

Discarded Streams

Proposes a `SchedulableKTable` that allows periodic aggregation of partial KTable state into a global summary at a configurable interval rather than on every record. When aggregating across all partitions (e.g., total spend by age group) at high throughput across many Streams instances, triggering a global rollup on every message creates an unbounded bottleneck at the aggregation point.

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