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Configuration schema upgrade: Deprecated configuration fields survive migration · case 02

Deprecated configuration fields survive migration.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Rename timeout_ms to timeout only when new key is absent, remove deprecated timeout_ms, add schema version, preserve unknown settings, and scale legacy milliseconds to seconds.

Why this case matters

An offline model of configuration schema upgrade, suitable for testing build and release tooling without external services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 2	`{"schema": 2, "timeout": 1.5, "timeout_ms": 1500}`	`{"schema": 2, "timeout": 1.5}`	Failed

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