database-designer

# Database Designer - POWERFUL Tier Skill ## Overview A comprehensive database design skill that provides expert-level analysis, optimization, and migration capabilities for modern database systems. This skill combines theoretical principles with practical tools to help architects and developers create scalable, performant, and maintainable database schemas. ## Core Competencies ### Schema Design & Analysis - **Normalization Analysis**: Automated detection of normalization levels (1NF through BCNF) - **Denormalization Strategy**: Smart recommendations for performance optimization - **Data Type Optimization**: Identification of inappropriate types and size issues - **Constraint Analysis**: Missing foreign keys, unique constraints, and null checks - **Naming Convention Validation**: Consistent table and column naming patterns - **ERD Generation**: Automatic Mermaid diagram creation from DDL ### Index Optimization - **Index Gap Analysis**: Identification of missing indexes on foreign keys and query patterns - **Composite Index Strategy**: Optimal column ordering for multi-column indexes - **Index Redundancy Detection**: Elimination of overlapping and unused indexes - **Performance Impact Modeling**: Selectivity estimation and query cost analysis - **Index Type Selection**: B-tree, hash, partial, covering, and specialized indexes ### Migration Management - **Zero-Downtime Migrations**: Expand-contract pattern implementation - **Schema Evolution**: Safe column additions, del...