CREATE TRIGGER bu_projects_tomerge_5
BEFORE UPDATE OF
    resolve
ON
    projects_tomerge
FOR EACH ROW WHEN
    NEW.resolve = 1
BEGIN

    SELECT debug(
        'TRIGGER bu_projects_tomerge_5',
        OLD.project_id
    );

    UPDATE
        topics
    SET
        mtime = (
            SELECT
                updates.mtime
            FROM
                project_updates
            INNER JOIN
                updates
            ON
                updates.id = project_updates.update_id
            WHERE
                project_updates.project_id = OLD.project_id
            ORDER BY
                updates.mtime DESC,
                updates.uuid
            LIMIT
                1
        )
    WHERE
        id = OLD.project_id
    ;

    DELETE FROM
        projects_tomerge
    WHERE
        project_id = OLD.project_id
    ;

    SELECT RAISE(IGNORE);

END;