🛡️ Safe Migration Checker

What we check

• DROP TABLE / DROP COLUMN data-loss risk
• DROP without IF EXISTS guard
• ADD NOT NULL without DEFAULT value
• ALTER COLUMN type changes (truncation risk)
• CREATE INDEX without CONCURRENTLY / ONLINE
• Adding FOREIGN KEY without NOT VALID (PostgreSQL)
• Removing PRIMARY KEY or UNIQUE constraints
• Missing transaction / rollback script
• DELETE / TRUNCATE in migrations
• Renaming columns or tables (breaking change)
• Unsafe type narrowing (e.g. VARCHAR(255) → VARCHAR(50))
• Direct data modifications (INSERT/UPDATE/DELETE)