CREATE TABLE IF NOT EXISTS users (
    uuid UUID PRIMARY KEY,
    username VARCHAR(10) NOT NULL
        CHECK (username ~ '^[a-z0-9]{1,10}$') UNIQUE,
    email VARCHAR(255) NOT NULL
        CHECK (email ~* '^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$'),
    password_hash TEXT NOT NULL,
    email_verified BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);