CREATE TABLE project_issues (
    id INTEGER NOT NULL PRIMARY KEY,
    issue_id INTEGER NOT NULL,
    project_id INTEGER NOT NULL,
    status_id INTEGER NOT NULL,
    update_id INTEGER NOT NULL,
    UNIQUE (issue_id,project_id),
    FOREIGN KEY(issue_id) REFERENCES issues(id) ON DELETE CASCADE,
    FOREIGN KEY(project_id,status_id) REFERENCES issue_status(project_id,id)
        ON DELETE CASCADE,
    FOREIGN KEY(update_id) REFERENCES updates(id) ON DELETE CASCADE
);