CREATE TRIGGER ad_issue_status_updates_1
AFTER DELETE ON
    issue_status_updates
FOR EACH ROW
BEGIN

    SELECT debug(
        OLD.update_id,
        OLD.issue_status_id,
        OLD.status,
        OLD.rank,
        OLD.def
    );

    INSERT OR IGNORE INTO
        issue_status_tomerge(issue_status_id)
    VALUES
        (OLD.issue_status_id)
    ;

    UPDATE
        issue_status_tomerge
    SET
        status = status + (OLD.status IS NOT NULL),
        rank   = rank + (OLD.rank IS NOT NULL),
        def    = def + (OLD.def IS NOT NULL)
    WHERE
        issue_status_id = OLD.issue_status_id
    ;

END;