Apply the Recorded Atomic Membership Merge

Context

The earlier merge implementation moved child units without transferring member affiliations. Product subsequently directed that member movement be built into the merge.

Decision

This record cites that decision rather than making it again. The service plans under locks, rejects new affiliation or identity conflicts and applies the plan in the structural transaction.

Alternatives Considered

Leave members on the absorbed source for manual transfers. The cited product decision replaces that former behavior because the merge must carry memberships now. Commit movable memberships and report the others. Partial completion would divide a single merge across incompatible results and require an additional recovery contract.

Consequences

The merge's local structural and membership writes commit together or roll back together. A membership that cannot follow prevents the complete merge until its conflict is resolved. Dues, settings, organization links and committee work remain on the source and are reported as leftovers.