CREATE TABLE users (
	user_id INT(8) NOT NULL AUTO_INCREMENT,
	user_name VARCHAR(30) NOT NULL,
	user_pass VARCHAR(255) NOT NULL,
	user_date DATETIME NOT NULL,
	UNIQUE INDEX user_name_unique (user_name),
	PRIMARY KEY (user_id)
) ENGINE = InnoDB;

CREATE TABLE categories (
	cat_id INT(8) NOT NULL AUTO_INCREMENT,
	cat_name VARCHAR(255) NOT NULL,
	cat_description VARCHAR(255) NOT NULL,
	UNIQUE INDEX cat_name_unique (cat_name),
	PRIMARY KEY (cat_id)
) ENGINE = InnoDB;

CREATE TABLE threads (
	thread_id INT(8) NOT NULL AUTO_INCREMENT,
	thread_subject VARCHAR(255) NOT NULL,
	thread_date DATETIME NOT NULL,
	thread_cat INT(8) NOT NULL,
	thread_author INT(8) NOT NULL,
	PRIMARY KEY (thread_id)
) ENGINE = InnoDB;

CREATE TABLE posts (
	post_id INT(8) NOT NULL AUTO_INCREMENT,
	post_content TEXT NOT NULL,
	post_date DATETIME NOT NULL,
	post_thread INT(8) NOT NULL,
	post_author INT(8) NOT NULL,
	PRIMARY KEY (post_id)
) ENGINE = InnoDB;

ALTER TABLE threads ADD FOREIGN KEY(thread_cat) REFERENCES categories(cat_id) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE threads ADD FOREIGN KEY(thread_author) REFERENCES users(user_id) ON DELETE RESTRICT ON UPDATE CASCADE;
ALTER TABLE posts ADD FOREIGN KEY(post_thread) REFERENCES threads(thread_id) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE posts ADD FOREIGN KEY(post_author) REFERENCES users(user_id) ON DELETE RESTRICT ON UPDATE CASCADE;