I’ll say don’t since this corrupts the whole data.
Your changelog states all changes made and should allow anyone auditing data to be able to tell what changed and when.
You can always update the issue or appropriate change to the value you want.
Once again I cannot recommend this in anyway.
If however you still want to, you can find all changes in JIRA in the changegroup and changeitem tables of your database.
Before proceeding I recommend backing up your instance because you can potentially corrupt your database.
However, and as I mentioned earlier, I do not recommend this in anyway.
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