CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(100) NOT NULL,
    first_name VARCHAR(100) NOT NULL,
    last_name VARCHAR(100) NOT NULL,
    email VARCHAR(255) NOT NULL UNIQUE,
    unique_key CHAR(25) NOT NULL UNIQUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Trigger zur automatischen Generierung eines 25‑stelligen Keys
DELIMITER $

CREATE TRIGGER before_user_insert
BEFORE INSERT ON users
FOR EACH ROW
BEGIN
    SET NEW.unique_key = SUBSTRING(
        REPLACE(UUID(), '-', '')
        -- UUID = 32 Zeichen, wir nehmen 25 davon
    , 1, 25);
END$

DELIMITER ;