How to change service request key number?

Question

While importing a CSV containing a few tickets to my project, I accidentally changed the key number. Rather than incrementing in the low thousands, Jira has jumped to more than 5 million. Every time a new ticket is created, it now starts at around 5 million. The difference is visibly shown in the screenshot below. I'm not even sure how I changed this during the CSV import.

John Funk · Answer

If you have created new work items after you did the import, and can't delete those, then you are pretty much stuck with the level you are at now.

Aditya Padebettu · Answer

We've already deleted all the ones that were created by the CSV import, but all new tickets (from actual users) are still incrementing in the millions.

John Funk · Answer

No, I just meant to delete the ones that were created by the CSV import.