Hi @Henk Smets ,
it is possible to reset the issue count !
First, delete all issues in the project.
Then what you would need to do is a CSV import, where you would have a column "issue key" and give it a value like "issue-1" (you also need to have a Summary in order to create the issue).
After the ticket is imported as "issue-1", the next created issue will be issue-2.
EDITED : actually the next created issue will pick up the old numbering, so this won't help :(
Let me know if this helps,
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