hatch3r-migration

Safe database schema migrations require breaking-change analysis that compares current versus target surfaces and documents required code changes by affected locations. The process supports brownfield scenarios by segmenting deployment into independent phases with validation criteria between each stage.

Phased rollouts for dependency upgrades break migration work into independently deployable phases, ensuring rollback safety through checkpointed execution. Each phase runs tests and integrity checks before proceeding, treating dependency conflicts as explicit deployment risks.

Rollback procedures activate automatically when a migration phase fails, reverting the system to the last successful checkpoint. The process treats rollback correctness gaps as deployment risks and requires tested validation paths before advancing to higher-risk phases.

Brownfield-only migrations are fully supported when consumer-compatibility handling is required. The approach analyzes breaking changes across affected locations, stages execution from low to high risk, and validates consumer impact between each deployment phase.

Post-migration cleanup removes compatibility shims and obsolete scripts after all phases complete successfully. The process benchmarks performance where relevant, runs final integrity checks, and generates documentation recording the completed migration state.

Phased migration strategies should be avoided when rollback correctness cannot be validated or dependency conflicts remain unresolved, as these are treated as deployment risks. Any phase failure triggers automatic rollback to the previous checkpoint rather than proceeding forward.