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Session grouping loses the final open session for each key · case 03

Session grouping loses the final open session for each key.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Group [key,time,id] events into sessions independently by key. Sort each key by (time,id); consecutive gaps <=gap belong to one transitive session. Emit [key,first-time,last-time,ordered-ids] ordered by key and session time. An intervening bridge may join otherwise distant endpoints.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
bridge chain	`[]`	`[["a", 3, 7, [10, 11, 12]]]`	Failed

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