Deliver update-before-create with a reproducible schedule
A subscription update arrived before its create event during an outage. Add a schedule format that can hold, reorder, and release specific events without relying on elapsed sleeps.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Event ordering · Deterministic tests · Version checks
Estimated field mix
- Quality engineering50%
- Real-time systems30%
- Integrations20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
An integration team closes incidents with screenshots of provider dashboards, then struggles to reproduce the same delivery sequence. Build a synthetic event corpus and replay runner against an allowlisted local receiver.
Setup prerequisites
- Create a local receiver fixture with an inspectable event store.
- Use generated test signing keys and synthetic payloads only.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- The scenario declares event order and release barriers separately from payload data.
- The receiver converges to the latest declared resource revision when all events arrive.
- Stale events cannot overwrite a newer stored revision.
Implementation constraints
- Define revision ordering in the lab contract instead of inferring it from arrival time.
Verification to include
- Run create-update and update-create schedules and compare final state.
- Append a stale update after convergence and verify the state remains at the newest revision.
Deliverables
- Barrier-based schedule runner and out-of-order scenarios
Rollout and recovery
Keep scheduling deterministic by default; random ordering is optional and must record a replayable seed.
Value of the work
For the engineer: Practice protocol verification, controlled fault injection, and reproducible incident investigation.
For the team: Review concrete evidence that webhook consumers tolerate real delivery failure patterns.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.