O(n) Authentication: When Your Login System Is Also A Performance Test

The function loops through ALL USERS to find one with matching credentials instead of using a proper query. The comment is the chef's kiss: "This only works because there are not many users." It's like saying "my car doesn't need brakes because I don't drive fast." Bonus security nightmare: they're storing password hashes but comparing them directly instead of hashing the input password first. This authentication is basically a time bomb wrapped in spaghetti code!