CREATE TABLE IF NOT EXISTS "SystemSettingHistory" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
  "key" varchar(128) NOT NULL,
  "previousValue" jsonb,
  "nextValue" jsonb,
  "reason" varchar(128),
  "changedAt" timestamp DEFAULT now() NOT NULL,
  "changedBy" uuid
);

DO $$ BEGIN
  ALTER TABLE "SystemSettingHistory"
    ADD CONSTRAINT "SystemSettingHistory_changedBy_User_id_fk"
    FOREIGN KEY ("changedBy") REFERENCES "public"."User"("id")
    ON DELETE no action ON UPDATE no action;
EXCEPTION
  WHEN duplicate_object THEN null;
END $$;

CREATE INDEX IF NOT EXISTS "SystemSettingHistory_key_changedAt_idx"
  ON "SystemSettingHistory" ("key", "changedAt" DESC);