ALTER TABLE tasks ADD COLUMN state TEXT NOT NULL DEFAULT '';
ALTER TABLE tasks ADD COLUMN review_requests INTEGER NOT NULL DEFAULT 0;
UPDATE tasks SET state = CASE
	WHEN tasks.status != 'active' THEN tasks.status
	WHEN tasks.discard_state != '' THEN 'discarding'
	WHEN tasks.merging_by != '' OR tasks.finalizing != '' THEN 'merging'
	ELSE coalesce((
		SELECT CASE
			WHEN s.state != 'idle' THEN s.state
			WHEN s.subagents > 0 THEN 'running'
			WHEN EXISTS (SELECT 1 FROM reviews r WHERE r.task_id = tasks.id AND r.state = 'running') THEN 'reviewing'
			WHEN tasks.review_requests > 0 THEN 'review_pending'
			ELSE 'idle'
		END
		FROM agent_sessions s
		WHERE s.task_id = tasks.id AND s.role != 'reviewer' AND s.state != 'completed'
		ORDER BY s.state = 'running' DESC, s.subagents > 0 DESC, s.created_at DESC LIMIT 1
	), 'no_agent')
END;