CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    `email` varchar(255) COLLATE utf8mb4_general_ci DEFAULT NULL,
    `group` ENUM('admin', 'user') DEFAULT 'user',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    contact VARCHAR(255) NULL
    `phone_number` varchar(255) COLLATE utf8mb4_general_ci DEFAULT NULL
);

CREATE TABLE love_wall (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT,
    content TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE articles (
    id INT AUTO_INCREMENT PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
    content TEXT NOT NULL,
    `type` ENUM('activity', 'news') NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE comments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT,
    content TEXT NOT NULL,
    love_wall_id INT DEFAULT NULL,
    article_id INT DEFAULT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id),
    FOREIGN KEY (love_wall_id) REFERENCES love_wall(id),
    FOREIGN KEY (article_id) REFERENCES articles(id)
);