Reconcile contact drift using bounded hashes and counts
Support needs to find mismatches without exporting every contact's personal data.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Reconciliation · Privacy
Estimated field mix
- Integrations50%
- Privacy engineering50%
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.
- BCRM-101 · Define contact field ownership between the app and CRM
- BCRM-102 · Separate external contact identity from email addresses
- BCRM-103 · Checkpoint CRM pagination only after local batch commit
- BCRM-106 · Handle provider rate limits without skipping contacts
- BCRM-104 · Apply contact updates with explicit conflict detection
- BCRM-105 · Propagate communication opt-outs ahead of ordinary profile updates
- BCRM-107 · Represent deleted CRM records with tombstone semantics
Acceptance criteria
- Compare scoped canonical synchronized-field digests.
- Report missing and changed identities separately.
- Limit detailed inspection to authorized records.
Implementation constraints
- Do not publish raw contact values in aggregate reports.
Verification to include
- Identify one missing and one changed contact.
- Deny reconciliation across organization boundaries.
Deliverables
- Drift report.
Rollout and recovery
Run read-only reconciliation before repair.
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.