Separate external contact identity from email addresses
An email change creates a second contact instead of updating the original.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Identity modeling
Estimated field mix
- Integrations60%
- Database engineering40%
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
- Use provider and organization-scoped external identities.
- Allow email changes without identity replacement.
- Detect conflicting identity mappings.
Implementation constraints
- Email is mutable data, not a stable key.
Verification to include
- Update an existing contact's email.
- Reject an external identity mapped across organizations.
Deliverables
- Identity mapping model.
Rollout and recovery
Backfill synthetic mappings before synchronization.
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.