完善业务闭环，实现对轮播图的管理，优化数据库表文件

temp_migration_backup/V4__Grant_permissions.sql

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+-- Novalon管理系统权限授予脚本
+-- 版本: V4
+-- 描述: 为novalon用户授予所有表的访问权限
+
+-- 授予所有表的SELECT, INSERT, UPDATE, DELETE权限
+GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA public TO novalon;
+
+-- 授予所有序列的使用权限
+GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO novalon;
+
+-- 设置默认权限，使未来创建的表自动授予novalon用户权限
+ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT, INSERT, UPDATE, DELETE ON TABLES TO novalon;
+ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT USAGE, SELECT ON SEQUENCES TO novalon;