Specify the entitlement response at an exact effective instant
Support compares screenshots from two time zones and cannot tell which storage limit applied when an upload failed.
- Focused work estimate
- 1h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- API contracts · Temporal modeling
Estimated field mix
- API design60%
- Backend40%
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
A fictional document service grants storage and collaboration rights from subscriptions. Support cannot explain why delayed events restore old limits.
Setup prerequisites
- Create a local subscription API with synthetic accounts.
- Understand transactions and UTC intervals.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Return limit, effective UTC instant and plan revision.
- Document inclusive start and exclusive end boundaries.
- Reject an invalid timestamp without resolving rights.
Implementation constraints
- Use synthetic plan names and integer byte limits.
Verification to include
- Resolve immediately before and at a plan boundary.
- Reject a timestamp without an offset and verify no write.
Deliverables
- Versioned response contract and boundary fixtures
Rollout and recovery
Introduce the versioned read route; remove routing if consumers reject it.
Value of the work
For the engineer: Practice temporal rules, concurrency and explainable API decisions.
For the team: Review whether entitlement changes preserve customer access and produce supportable decisions.
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.