Validate promotion date ranges before publishing drafts
A promotion with its end before its start passes draft review and can never apply.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Validation · Temporal rules
Estimated field mix
- Backend100%
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 parts supplier combines contract prices with promotions. Sales needs repeatable quotes when rules change during checkout.
Setup prerequisites
- Create synthetic products and integer minor-unit prices.
- Implement a small local quote API.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Require offset-bearing UTC-normalizable dates.
- Reject empty and reversed ranges at publication.
- Display validation paths without raw rule documents in logs.
Implementation constraints
- Use half-open intervals consistently.
Verification to include
- Publish an adjacent pair of valid promotions.
- Reject reversed, missing-offset and empty intervals.
Deliverables
- Publication date guard
Rollout and recovery
Deploy guard for unpublished drafts; preserve existing published versions.
Value of the work
For the engineer: Practice deterministic rule evaluation, revision control and bounded execution.
For the team: Review explainable commercial rules without trusting opaque price changes.
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.