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You know you should test that data insertion script before deploying to production. You really know it. But there's a demon on your shoulder whispering sweet nothings like "it's just a simple INSERT, what could go wrong?" and "testing is for people who don't trust their own code."
Spoiler alert: Everything can go wrong. Duplicate keys, type mismatches, SQL injection vulnerabilities you didn't sanitize, foreign key constraints you forgot existed, and that one column that's NOT NULL but you're passing undefined. But sure, let it rip against prod. What's the worst that could happen? Just your entire user table getting nuked at 3 PM on a Friday.
The devil wins this round about 60% of the time, and that's how we all learn the hard way that backups are a suggestion from a higher power.
