Validate workshop hold quantities before storage
A zero-seat request creates a hold and a fractional request breaks counts. Enforce bounded integer quantities.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Validation · Contracts
Estimated field mix
- Backend80%
- API design20%
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
- Positive integers within limit pass
- Zero and fractions fail
- Invalid input creates no record
Implementation constraints
- Keep limits explicit in the local contract.
Verification to include
- Hold two seats
- Reject zero and oversized quantities
Deliverables
- Quantity validator and failure cases
Rollout and recovery
Reject new holds if validation is unavailable.
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.