What problem does it solve? Database migrations in production risk corrupting authoritative records, breaking tenant isolation, or losing data during rollback. This Skill reviews EightForge schema and data migrations against a strict checklist covering ordered rollout, measured backfills, RLS alignment, compatibility windows, and zero-downtime safety. ## Core Features & Use Cases - Rollout Phase Review: Verifies the explicit expand -> backfill -> validate -> cutover -> contract state machine with entry/exit gates, owners, and compatibility windows. - Backfill and Rollback Validation: Checks that backfills are deterministic, idempotent, and measured with source/target counts, and that rollback accounts for writes accepted after deployment. - Authority and Tenant Safety: Classifies every affected table as production authority, compatibility, shadow, design target, or superseded, and confirms organization/project scoping and RLS behavior are preserved. - Use Case: Before merging a Supabase migration that adds an index and backfills a new column, run this review to confirm the index strategy, backfill idempotency, mixed-version safety, and contraction plan are sound. ## Quick Start Review the pending Supabase migration in supabase/migrations for rollout ordering, backfill safety, RLS impact, and rollback risk.
