小课堂，使用RLS来授权用户访问
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RLS使用教程：https://document.memfiredb.com/docs/guides/auth/row-level-security2
管理用户数据：https://document.memfiredb.com/docs/guides/auth/managing-user-data
行级安全性：https://document.memfiredb.com/docs/guides/auth/row-level-security
https://document.memfiredb.com/docs/learn/auth-deep-dive/auth-row-level-security