Rebuild an account entitlement projection from its ordered history
A projection bug affected a synthetic account; operators need to repair derived rights without rewriting the source change history.
- Focused work estimate
- 6h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Recovery · Projection design
Estimated field mix
- Data engineering50%
- Backend30%
- Database engineering20%
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 document service grants storage and collaboration rights from subscriptions. Support cannot explain why delayed events restore old limits.
Setup prerequisites
- Create a local subscription API with synthetic accounts.
- Understand transactions and UTC intervals.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- ADRIFT-101 · Specify the entitlement response at an exact effective instant
- ADRIFT-103 · Reject negative and fractional seat allowances consistently
- ADRIFT-104 · Apply a scheduled downgrade only after its stored effective time
- ADRIFT-105 · Prevent a late upgrade event from undoing a newer cancellation
- ADRIFT-102 · Keep manual account restrictions separate from plan allowances
- ADRIFT-106 · Make plan switching and seat allocation share one consistency boundary
- ADRIFT-108 · Explain a denied upload using the exact entitlement revision
Acceptance criteria
- Rebuild into a separate generation using deterministic ordering.
- Compare differences before atomically selecting the generation.
- Interrupted rebuild leaves the active projection usable.
Implementation constraints
- Require an account scope and dry-run mode.
Verification to include
- Compare a rebuilt generation with a clean reference history.
- Interrupt before activation and prove the old generation still resolves.
Deliverables
- Scoped rebuild command and difference report
Rollout and recovery
Dry-run one synthetic account; restore the previous generation pointer on mismatch.
Value of the work
For the engineer: Practice temporal rules, concurrency and explainable API decisions.
For the team: Review whether entitlement changes preserve customer access and produce supportable decisions.
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.