I have not found a diagram depicting the conceptual data model for Jira in the documentation. If you start to create lots of projects, lots of custom fields, lots of issue types, etc., the resulting configuration screens can be quite confusing.

I have attempted to create a UML diagram represting this model (attached), but it's incomplete (& probably wrong in some places).

Perhaps something like this could be maintained as part of the released documentation for Jira?