Constraints & Referential Integrity Review Review database constraints, foreign keys, and data integrity rules. Database-Level Enforcement Race Condition Prevention Missing Constraints Checklist | Validation | Required DB Constraint | |------------|----------------------| | | | | | Unique index | | | Foreign key | | | Check constraint | | | Check constraint | Foreign Key Cascades Polymorphic Associations Orphan Detection Queries Review Checklist - [ ] All validations have unique indexes? - [ ] All validations have NOT NULL constraints? - [ ] All columns have foreign keys? - [ ] Cascade rules…