Investigate runtime grey box testing (db queries/file system/security etc.)

Now that we have good black box coverage, I think it would be useful to introduce some grey box tests.
These would be against the full running system, but have access to some internal state.
Some things I am thinking of but we can expand:
- Query DB state, is everything as expected
- Query M/S/B filesystem
- Network traffic between services
etc.

查看仓库中现有的黑盒测试以理解系统架构。识别用于监控数据库状态、文件系统（M/S/B）和服务间网络流量的入口点。确定如何对运行中的系统进行插装以暴露内部状态供验证。通过创建几个验证内部一致性的灰盒测试示例来定义“完成”的标准。

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