What's been your biggest stomach drop mistake in your tech career?

Inspired by the Azure MFA post.

When I was an implementation consultant and still new to SQL, I was writing a statement to delete records per client request, our ISE allowed you to test code by highlighting and it would only run what was highlighted, of course I ran the select and the not the where, and deleted millions of records in production, during busy season. Luckily we were running Oracle 11g at the time and had just gotten flashback …

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