Restarting MySQL corrupts the installation

[jtagcat]

Steps to reproduce the behaviour

Using jtagcat:docker from #671

1. docker compose up -d
2. Wait 3 minutes for initialization
3. docker compose down
4. docker compose up -d
5. Open the webpage

UI POST 400 /make_session

Even if all data (including /tmp) is persisted in the MySQL container, and you only restart it, this is the result.

Workaround

I switched it from MySQL to MariaDB. Magically works. Didn't find the cause in an hour.