Represent cancelled subscriptions as movements instead of deleting them
Deleting a cancelled subscription from the source erases the churn event from the report.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Change data · Lineage
Estimated field mix
- Data engineering100%
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 SaaS analyst reports expansion revenue differently from finance because snapshots, refunds and contract changes are joined at incompatible grains.
Setup prerequisites
- Create a synthetic source schema and local transformation project.
- Use integer minor units and distinct reporting currencies.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- ADBT-101 · Declare the subscription-movement grain before joining invoice lines
- ADBT-102 · Separate recurring contract value from collected cash
- ADBT-103 · Reject source schema drift before materializing the mart
- ADBT-104 · Join customer segments as of the revenue event date
- ADBT-105 · Make incremental movement loads include revised source rows
Acceptance criteria
- Retain cancellation effective date and source tombstone lineage.
- Emit one cancellation movement per effective revision.
- Expose unavailable source history as incomplete reporting.
Implementation constraints
- Use synthetic deletion events rather than recovering private backups.
Verification to include
- Apply a cancellation tombstone and retain its churn movement.
- Replay the tombstone and verify no double cancellation.
Deliverables
- Tombstone handling and movement fixtures
Rollout and recovery
Enable tombstone capture before source deletion; halt destructive cleanup if lineage is missing.
Value of the work
For the engineer: Practice analytical modeling and explainable transformation contracts.
For the team: Review trustworthy reporting definitions and the cost of correcting historical reports.
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.