Apply contact updates with explicit conflict detection
A delayed CRM event overwrites a newer local edit.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Concurrency · Data synchronization
Estimated field mix
- Distributed systems40%
- Integrations40%
- 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 account team sees overwritten edits, duplicate contacts, and stale opt-out preferences after synchronization retries.
Setup prerequisites
- Create a local CRM double and synthetic contact records for two organizations; no real personal data or CRM credentials.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Compare the declared version or revision.
- Apply field ownership rules on conflicts.
- Preserve unresolved values and provenance.
Implementation constraints
- Do not use arrival time as proof of freshness.
Verification to include
- Merge independent field edits.
- Detect conflicting edits to the same owned field.
Deliverables
- Conflict-aware update handler.
Rollout and recovery
Enable writes only after the conflict report is reviewable.
Value of the work
For the engineer: Practice sync cursors, conflict policies, privacy boundaries, and replay.
For the team: Provide predictable customer-data synchronization with inspectable conflicts.
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.