Data Model Review

Review this data model for {{domain}}: {{model}}. Assess whether the entities and relationships correctly capture the domain, normalization and where denormalization is justified, the keys and constraints, how it handles the queries it must serve, flexibility for likely future requirements without over-engineering, and potential performance or integrity issues. Flag the design decisions that will be expensive to change later, and recommend improvements. Data model mistakes are costly to fix once data exists, so be thorough about getting the foundations right.