data-dictionary-definition

Structured catalog of data entities and attributes. Per entity: source of truth, owner, sensitivity, retention, volume. Per attribute: type (string / integer / decimal / boolean / date / timestamp / enum / reference / json / array), format, nullable, constraints, source, mandatory PII classification (none / identifier / quasi-identifier / sensitive / health / financial / biometric / children's / Art-9), masking rule, validation rules. Typed relationships with cardinality + FK + cascade. Governance + versioning. Mermaid ERD with optional PNG export. Markdown + CSV export.