You can't put a ? inside a quoted string in your SQL statement as DBI won't see it as a placeholder, but as a simple string. I just pulled the following out of some existing code I wrote a while ago, so I know it works:
INSERT INTO eventdates (eventdate, event, date)
VALUES (?, ?, ?::timestamp + ?::interval)
So what you need to do is add the ' minutes' part to a perl variable and pass that entire string to the placeholder.
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