Apply a scheduled downgrade only after its stored effective time
A worker runs the next day's downgrade early when a retry executes against the server's local calendar date.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- State transitions · Idempotency
Estimated field mix
- Backend80%
- Distributed systems20%
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
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Compare a persisted UTC instant with an injected clock.
- Early delivery leaves the schedule pending.
- Repeated eligible delivery creates one entitlement revision.
Implementation constraints
- Persist the revision and dispatch record in one transaction.
Verification to include
- Advance a fake clock through the exact effective instant.
- Deliver early and twice after the boundary; count one revision.
Deliverables
- Scheduled transition and deterministic-clock tests
Rollout and recovery
Canary scheduled changes; pause the consumer and retain pending schedules on failure.
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.