Reduce repeated downloads with integrity-aware caching
Unchanged exports are repeatedly transferred because clients cannot validate their cache.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- HTTP caching · Authorization
Estimated field mix
- Performance engineering40%
- API design30%
- Security30%
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 analytics service stores exports and intermediate artifacts indefinitely. Finance sees a rising bill but engineers cannot explain which lifecycle policy is responsible.
Setup prerequisites
- Create synthetic object inventories and a local object-store double; author fictional unit prices as explicit assumptions.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Expose stable content validators for immutable exports.
- Honor conditional reads correctly.
- Invalidate cached authority when access is revoked.
Implementation constraints
- A content digest is not an access credential.
Verification to include
- Return unchanged status for an authorized matching validator.
- Deny a revoked client despite its cached validator.
Deliverables
- Conditional-download contract.
Rollout and recovery
Enable for immutable exports first; retain full-download fallback.
Value of the work
For the engineer: Practice cost attribution, lifecycle modeling, and safe retention controls.
For the team: Produce reviewable storage-cost options with recovery and data-retention consequences.
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.