Display workshop hold countdown as advisory
A client clock skew shows time remaining after the server expired the hold. Label countdown and reconcile server refusal.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Time · UX
Estimated field mix
- Frontend70%
- Real-time systems30%
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.
- CAUCT-101 · Specify workshop seat counts without negative availability
- CAUCT-102 · Validate workshop hold quantities before storage
- CAUCT-103 · Create workshop holds atomically under contention
- CAUCT-104 · Scope workshop hold lookup and cancellation to its owner
- CAUCT-105 · Confirm workshop holds only before the expiry boundary
- CAUCT-106 · Replay workshop hold requests with the same idempotency key
- CAUCT-107 · Publish workshop availability changes only after commit
- CAUCT-108 · Rebuild workshop availability after a missed realtime update
Acceptance criteria
- Countdown uses server offset estimate
- Zero disables local confirmation
- Server expiry still wins
Implementation constraints
- A visual timer cannot authorize a reservation.
Verification to include
- Use skewed client clock
- Confirm after authoritative expiry
Deliverables
- Countdown presenter and skew cases
Rollout and recovery
Replace countdown with expiry timestamp if offset is unreliable.
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.