FOREIGN KEY(id_user) REFERENCES users (id) ON DELETE CASCADE,
FOREIGN KEY(id_vote) REFERENCES votes (id) ON DELETE CASCADE,
PRIMARY KEY(id_user, id_vote)
FOREIGN KEY(id_user) REFERENCES users (id) ON DELETE CASCADE,
FOREIGN KEY(id_vote) REFERENCES votes (id) ON DELETE CASCADE,
PRIMARY KEY(id_user, id_vote)