ALTER TABLE mergefix_runs ADD COLUMN queue_method TEXT CHECK (queue_method IN ('merge', 'squash'));
ALTER TABLE mergefix_runs ADD COLUMN requeue_status TEXT CHECK (requeue_status IN ('waiting', 'enqueued', 'gave_up'));
ALTER TABLE mergefix_runs ADD COLUMN requeue_attempts INTEGER NOT NULL DEFAULT 0;
ALTER TABLE mergefix_runs ADD COLUMN requeue_error TEXT;