You should avoid reading the database directly, as it's generally a very bad thing to do. What are you actually trying to acheive? There is almost certainly a better way to do it than reading the database.
But to answer it: changegroup is a change, with the individual changes of fields, as well as non-fields such as status, logged in changeitem. You may want to read jiraaction too for comments, or if you have a very very old dataset. There are then some other things logged in other places, but that should cover 95% of what you want to look at
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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