data-validation-patterns

Migration data validation patterns: row count comparison, checksums, sampling validation, FK integrity, and business rule validation query design guide. Use this skill for requests involving 'data validation', 'migration validation', 'checksum', 'row count comparison', 'integrity validation', 'regression testing', 'Go/No-Go checklist', etc. Enhances validation-engineer's validation design capabilities. Note: schema mapping and rollback planning are outside the scope of this skill.