CREATE INDEX "schedule_published_song_idx" ON "Schedule" USING btree ("isDraft","songId","playDate");--> statement-breakpoint
CREATE INDEX "schedule_published_date_idx" ON "Schedule" USING btree ("isDraft","playDate");--> statement-breakpoint
CREATE INDEX "song_collaborators_song_status_idx" ON "song_collaborators" USING btree ("song_id","status");--> statement-breakpoint
CREATE INDEX "song_collaborators_user_status_idx" ON "song_collaborators" USING btree ("user_id","status");--> statement-breakpoint
CREATE INDEX "song_replay_requests_user_status_song_idx" ON "song_replay_requests" USING btree ("user_id","status","song_id");--> statement-breakpoint
CREATE INDEX "song_semester_created_at_idx" ON "Song" USING btree ("semester","createdAt");--> statement-breakpoint
CREATE INDEX "song_requester_id_idx" ON "Song" USING btree ("requesterId");--> statement-breakpoint
CREATE INDEX "vote_user_song_idx" ON "Vote" USING btree ("userId","songId");--> statement-breakpoint
-- 保留每个用户对每首歌曲最早的一条投票，清理旧版本并发产生的重复记录。
WITH ranked_votes AS (
	SELECT
		"id",
		ROW_NUMBER() OVER (PARTITION BY "songId", "userId" ORDER BY "id") AS duplicate_rank
	FROM "Vote"
)
DELETE FROM "Vote"
WHERE "id" IN (
	SELECT "id"
	FROM ranked_votes
	WHERE duplicate_rank > 1
);--> statement-breakpoint
ALTER TABLE "Vote" ADD CONSTRAINT "vote_song_user_unique" UNIQUE("songId","userId");