FA-44699 / Data systems / Member archive

A filtered update publishes insertion before retraction · case 04

A filtered update publishes insertion before retraction.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Convert a sequence of [id,before,after] updates into signed filtered rows, with None denoting absent row. The predicate is value>=cutoff. Emit qualifying before-images negatively before qualifying after-images positively; suppress unchanged qualifying values.

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
changes within filter	`[[7, 6, 1], [7, 5, -1]]`	`[[7, 5, -1], [7, 6, 1]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.