Aglet

Verify Synchronization Freshness and Recovery

Freshness verification needs a known source change, an observable destination update, and a defined clock for each boundary. Exercise normal, delayed, and out-of-order changes, then inspect values and timestamps. Confirm that recovery does not hide a source that was never updated.

Check whether the outcome improved

  1. Test freshness cases

    Use bounded fixtures for a normal change, a delayed delivery, an out-of-order version, and a source with no new update. Assert expected destination state and freshness classification for each. Include equal timestamps with different versions when version ordering matters.

  2. Measure end-to-end lag

    Compare source change time, delivery time, processing completion, persistence time, and read time against the documented interval. Review the oldest and newest affected entities, not only an average. Explain any lag that falls outside the intended cohort or recovery window.

  3. Check recovery boundaries

    Run the bounded replay or correction path and verify changed values, versions, counts, and downstream views. Confirm repeated execution does not create extra rows or regress newer state. Retain evidence for entities that remain stale so unresolved work stays visible.

What to carry forward

Accept recovery when known source changes reach the intended destination within the stated window, out-of-order inputs follow the version rule, quiet sources are classified correctly, and remaining lag is explained. Keep verification open for unobserved stages or broader source cohorts.

Keep the decision with the work.

Use a Work Item in Aglet to record the problem, the evidence you have, and the next decision. Add an owner and priority, then keep updates in the discussion so the next person can follow the reasoning.

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