to To connect to a Database in custo diagnostic 5.XX x you need to have a to download SQuirreL SQL Client, you can do so from the following LINK
Now switch off here: https://sourceforge.net/projects/squirrel-sql
Now shutdown the Apache Tomcat diagserver from the Services menu in Windows.
Start the SQuirrel SQL Client and enter the settings to connect to the database.
The DbUrl can be found in the following file on the following location : this file: "C:\Program Files\custo diagnostic server\conf\diag.properties"
now Now you can open the database and look into it.
For a more detailed instruction look into this VIDEO