-- Tables affected: qt_projects
-- recovery.not-started: check first; ADD COLUMN fails if tracker_url already exists
-- recovery.partial: ALTER TABLE qt_projects DROP COLUMN tracker_url;
-- recovery.completed: no action needed
-- verify: tracker_url column missing | SELECT 1 FROM information_schema.COLUMNS WHERE table_schema=DATABASE() AND table_name='qt_projects' AND column_name='tracker_url' HAVING COUNT(*)=0

ALTER TABLE qt_projects
    ADD COLUMN tracker_url VARCHAR(500) NULL AFTER name;

UPDATE qt_projects
SET tracker_url = CONCAT('https://tracker.yandex.ru/', TRIM(name))
WHERE (tracker_url IS NULL OR tracker_url = '')
  AND TRIM(COALESCE(name, '')) <> '';