CREATE TABLE hub_related_updates(
    hub_id INTEGER NOT NULL,
    update_id INTEGER NOT NULL,
    merkled INTEGER NOT NULL DEFAULT 0,
    UNIQUE(hub_id,update_id) ON CONFLICT IGNORE,
    CHECK (merkled = 0 OR merkled = 1),
    FOREIGN KEY(hub_id) REFERENCES hubs(id) ON DELETE CASCADE,
    FOREIGN KEY(update_id) REFERENCES updates(id) ON DELETE CASCADE
);