SQLAlchemy数据库操作最佳实践指南：避免循环，使用批量操作与仓库模式

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When performing database operations using SQLAlchemy, follow these guidelines to ensure efficient and maintainable code:

• Avoid for-loops. Instead always prefer bulk operations using SQLAlchemy's built-in methods or use SQL joins to get related data in a single query.
• Database operations should be contained in repository classes

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