Rehearse rollback when delivery quotes become inconsistent
The rollback plan restores code but says nothing about orders already using the new delivery model.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Release recovery · Data compatibility
Estimated field mix
- Quality engineering40%
- Platform engineering30%
- Database engineering30%
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 retailer is changing delivery options. Its regression suite is large, but no one can explain whether inventory, totals, or recovery behavior is covered.
Setup prerequisites
- Build a minimal local checkout fixture with synthetic prices, inventory, and a mock delivery provider.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BRELEASE-101 · Map delivery-option changes to checkout invariants
- BRELEASE-102 · Create boundary partitions for delivery eligibility
- BRELEASE-103 · Verify totals remain stable across delivery-option switching
- BRELEASE-104 · Test inventory reservation when checkout is abandoned
- BRELEASE-106 · Exercise partial provider failure without duplicating orders
- BRELEASE-105 · Check assistive-technology behavior for delivery errors
- BRELEASE-107 · Run a structured exploratory session on edited addresses
- BRELEASE-108 · Assess a reduced regression suite against explicit omission risk
- BRELEASE-109 · Create a release evidence index with reproducible commands
Acceptance criteria
- Define a measurable stop condition for quote inconsistency.
- Preserve completed orders and reconcile pending bookings.
- Verify the old application can read retained order records.
Implementation constraints
- Do not delete accepted transactions to simplify recovery.
Verification to include
- Roll back after a synthetic completed and pending order.
- Verify unsupported records trigger a reviewed repair path.
Deliverables
- Rollback rehearsal and data compatibility report.
Rollout and recovery
Gate release on the rehearsal; prefer disabling new bookings while reconciling pending work.
Value of the work
For the engineer: Practice risk analysis, exploratory testing, and evidence-based release decisions.
For the team: Provide a reviewable release assessment tied to customer-impacting invariants.
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.