Database Design

Use when designing, reviewing, or optimizing MySQL database schemas — covering table structure design, fixed audit fields, status field conventions, time field type selection, unique constraints for idempotency, and index design principles with EXPLAIN guidance. Triggers: 在项目中设计、评审或优化 MySQL 表结构,需要统一固定字段、状态字段、时间字段、唯一约束与索引设计规范时。Also relevant for database schema review, SQL table creation, index optimization, database migration design, and multi-table relationship modeling.

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