Flag table rewrites and long-held locks for review
A small-looking column change can block writes on a large table.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- PostgreSQL · Static analysis
Estimated field mix
- Database engineering50%
- Developer tooling50%
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 subscription service has accumulated migration scripts with unclear lock risks and no consistent rehearsal output.
Setup prerequisites
- Create a disposable local database with synthetic subscriptions and a separate scratch database; author all fixtures locally.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Identify a documented bounded set of risky SQL forms.
- Explain potential lock or rewrite behavior.
- Mark unrecognized forms as requiring manual review.
Implementation constraints
- This heuristic must not label arbitrary SQL safe.
Verification to include
- Flag a configured rewrite example.
- Leave an unsupported statement explicitly unclassified.
Deliverables
- Risk annotations and limitations.
Rollout and recovery
Run advisory checks; preserve manual review for unsupported SQL.
Value of the work
For the engineer: Practice migration tooling, lock reasoning, and clear developer feedback.
For the team: Provide reviewers with repeatable migration checks and explicit recovery limits.
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.