Confirm workshop holds only before the expiry boundary
Confirm and expiry cleanup race, creating reservations from expired holds. Add an atomic transition with one time rule.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- State machines · Concurrency
Estimated field mix
- Database engineering60%
- 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
Fictional craft studio Maple offers workshop seats. Implement synthetic reservations without payments or real booking services.
Setup prerequisites
- Create synthetic workshops with small capacities.
- Implement local transactional hold storage and injected clocks.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Eligible hold confirms once
- Expired hold cannot confirm
- Cleanup cannot remove confirmed reservation
Implementation constraints
- Compare time inside the authoritative transition.
Verification to include
- Confirm before boundary
- Race confirm with expiry cleanup
Deliverables
- Confirmation transition and boundary cases
Rollout and recovery
Pause confirmation if atomicity fails.
Value of the work
For the engineer: Practice contention, expiry and truthful realtime projections.
For the team: Inspect whether concurrent clients avoid overselling and recover uncertain results.
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.