Keep legacy and new projections over one domain authority
Separate version handlers duplicate inventory rules and begin disagreeing.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Architecture · Authorization
Estimated field mix
- API design50%
- System design30%
- Backend20%
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 inventory platform must replace a legacy availability response. Existing partners upgrade on different schedules, and the team needs a versioned transition.
Setup prerequisites
- Create two local API versions and synthetic partner clients with different upgrade schedules; no real partner traffic.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Share domain availability calculation.
- Map into distinct immutable transport schemas.
- Preserve version-specific unknown-state semantics.
Implementation constraints
- Controllers cannot bypass tenant-scoped service reads.
Verification to include
- Project one domain result into both versions.
- Deny cross-tenant reads through either route.
Deliverables
- Versioned projection boundary.
Rollout and recovery
Ship the new projection alongside the old; retain identical domain invariants.
Value of the work
For the engineer: Practice public-contract design, compatible evolution, and client lifecycle management.
For the team: Provide a predictable migration that keeps supported integrations inspectable and recoverable.
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.