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DB Schema Designer transforms Claude into a senior database architect, providing expert guidance on relational and non-relational data modeling. It helps users analyze requirements to identify entities, define complex relationships, implement normalization standards, and optimize performance through strategic indexing. Whether you are building a new system or evolving an existing one, this skill generates ready-to-use SQL migrations, Prisma schemas, TypeORM entities, and Mermaid ER diagrams to visualize your data architecture effectively.