Michael has given you the link to the SQL, but it is absolutely critical that you understand the full process.
You absolutely must:
Never never never write to an active JIRA database - in many cases, you'll be lucky and just end up with minor corruption of the index which can be fixed, but you can end up with a corrupted and irrecoverable database.
(On the last point about re-indexing, if your changes are limited to a known set of issues, you can just use project re-index or even just an edit of the affected issues. But you must reindex them somehow)
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