Harness-engineering db-polymorphic-associations

name: db-polymorphic-associations version: "1.0.0" description: Single-table inheritance, class-table inheritance, and shared foreign key patterns for polymorphic data stability: static cognitive_mode: advisory-guide type: knowledge tier: 3 triggers:

• manual platforms:
• claude-code
• gemini-cli
• cursor
• codex tools: [] paths: [] related_skills:
• db-first-normal-form
• db-third-normal-form
• db-denormalization
• db-entity-attribute-value
• db-document-in-relational
• prisma-schema-design
• drizzle-schema-definition stack_signals:
• postgresql
• mysql
• database keywords:
• polymorphic-association
• single-table-inheritance
• class-table-inheritance
• concrete-table-inheritance
• discriminator-column
• shared-foreign-key metadata: author: community upstream: "martinfowler.com/eaaCatalog/singleTableInheritance.html" state: persistent: false files: [] depends_on: []