Rehearse archive restoration from manifests after index loss
The search projection is lost, but the recovery plan assumes an index backup rather than using the authoritative archive.
- Focused work estimate
- 4h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Recovery design · Integrity verification
Estimated field mix
- Storage systems40%
- System design30%
- Site reliability30%
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 procurement platform keeps append-only action records. Operators want fast recent search and affordable old records without losing provenance or leaking tenant data.
Setup prerequisites
- Create synthetic audit events and local storage/search adapters.
- Use an explicit fictional retention policy, not legal advice.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- AARCHIVE-101 · Define which audit questions require indexed search versus archive retrieval
- AARCHIVE-102 · Calculate archive storage growth from event size and retention assumptions
- AARCHIVE-103 · Choose hot and cold archive boundaries with a reviewable decision record
- AARCHIVE-104 · Define an immutable archive segment manifest
- AARCHIVE-105 · Specify search indexing as a rebuildable projection of archived events
- AARCHIVE-106 · Authorize archive retrieval before issuing object capabilities
- AARCHIVE-107 · Define archive query pagination across hot and cold boundaries
- AARCHIVE-108 · Model retention as a policy decision separate from audit immutability
Acceptance criteria
- Restore a new index generation from verified segments.
- Report corrupt or missing segments separately from indexed count.
- Keep queries from mixing partial and complete generations.
Implementation constraints
- Use a small synthetic archive with one intentionally damaged segment.
Verification to include
- Rebuild from complete manifests and compare query identities.
- Include the damaged segment and block a complete-generation claim.
Deliverables
- Restoration drill and completeness report
Rollout and recovery
Run the drill before archive activation; retain the old searchable generation until reconciliation succeeds.
Value of the work
For the engineer: Practice storage tradeoffs, provenance and data-lifecycle decisions.
For the team: Review archive cost and retrieval guarantees before committing to infrastructure.
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.