'How to delete history items from Redmine issue

At the bottom of each issue page there is a History of changes. Some of those are autogenerated by external tools, or by a user that made a mistake, so it would be useful to be able to delete them. Is this possible?

I tried in the standard form and also in the editable form after clicking "Update". I also tried with History updates made with my own user

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Solution 1:[1]

I am used to do this from the database backend, there's a table which can be edited/emptied. If that helps in your use case.

PA

Solution 2:[2]

Yeah, you need to truncate the following tables: journals, journal_details. This way you will not destroy any other content. Just do not delete the tables. PA

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Solution Source
Solution 1 PietroA
Solution 2 PietroA