CREATE TABLE IF NOT EXISTS post_votes (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    post_id INT NOT NULL,
    vote_type ENUM('like', 'dislike') NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY user_post_vote (user_id, post_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
);