Classify shipment reads by tolerated staleness
The regional-read proposal treats a public tracking estimate and an address-change confirmation as equally cacheable.
- Focused work estimate
- 1h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Consistency requirements · Product reasoning
Estimated field mix
- System design60%
- Distributed systems40%
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 logistics dashboard serves distant customers from one primary region. Stakeholders want faster reads and outage recovery but have not agreed which data may be stale.
Setup prerequisites
- Create a local primary/replica simulator and synthetic shipment records.
- Use local models; no multi-region infrastructure is provisioned.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- List read classes with explicit hypothetical freshness limits.
- Require fresh authority for security and mutation confirmation.
- Document unknown product requirements separately.
Implementation constraints
- Use a synthetic status timeline with version numbers.
Verification to include
- Assign a declared budget to public tracking.
- Show why address-change confirmation needs its accepted version.
Deliverables
- Read-consistency matrix
Rollout and recovery
Review the matrix before routing changes; leave unresolved classes on primary reads.
Value of the work
For the engineer: Practice consistency tradeoffs, failover authority and recovery assumptions.
For the team: Review regional availability proposals with explicit data-loss and staleness limits.
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.