Ah, the "optimization" that makes security professionals wake up screaming! This tweet is showcasing the database equivalent of putting all your eggs in one extremely flammable basket.
Sure, they reduced storage from 100GB to 3GB by centralizing all passwords with foreign key references. But they've also created the ultimate security nightmare - one breach and all passwords are compromised. Not to mention they're enabling password reuse, which is like using "password123" as your bank PIN, email password, and nuclear launch code.
That 97GB reduction is going to cost them approximately $10 million in breach notification costs. Such efficiency!