CREATE TRIGGER ad_issue_updates_1
AFTER DELETE ON
    issue_updates
FOR EACH ROW
BEGIN

    SELECT debug(
        OLD.update_id,
        OLD.issue_id,
        OLD.status_id,
        OLD.title
    );

    INSERT OR IGNORE INTO
        issues_tomerge(issue_id)
    VALUES
        (OLD.issue_id)
    ;

    UPDATE
        issues_tomerge
    SET
        title    = title + (OLD.title IS NOT NULL)
    WHERE
        issue_id = OLD.issue_id
    ;

END;