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
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