UPDATE desktop_tasks
SET status = 'failed',
    updated_at = NOW()
WHERE kind = 'monitor'
  AND status = 'unknown';

DROP INDEX IF EXISTS uq_desktop_tasks_monitor_active;

CREATE UNIQUE INDEX IF NOT EXISTS uq_desktop_tasks_monitor_active
    ON desktop_tasks (monitor_task_id)
    WHERE kind = 'monitor'
      AND monitor_task_id IS NOT NULL
      AND status IN ('queued', 'in_progress');