CREATE TABLE IF NOT EXISTS "SystemSettingSnapshot" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
  "scope" varchar(64) NOT NULL,
  "label" varchar(128),
  "summary" jsonb,
  "data" jsonb NOT NULL,
  "createdAt" timestamp DEFAULT now() NOT NULL,
  "createdBy" uuid
);

DO $$
BEGIN
  ALTER TABLE "SystemSettingSnapshot"
    ADD CONSTRAINT "SystemSettingSnapshot_createdBy_User_id_fk"
    FOREIGN KEY ("createdBy") REFERENCES "public"."User"("id")
    ON DELETE NO ACTION
    ON UPDATE NO ACTION;
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

CREATE INDEX IF NOT EXISTS "SystemSettingSnapshot_scope_createdAt_idx"
  ON "SystemSettingSnapshot" ("scope", "createdAt" DESC);