-- اقلام سفارش شرکت خود را نگه می‌دارند تا یک فاکتور چندشرکتی ممکن شود.
ALTER TABLE "OrderItem" ADD COLUMN "companyId" TEXT;
ALTER TABLE "OrderItem" ADD COLUMN "companyName" TEXT;

UPDATE "OrderItem" AS oi
SET
  "companyId" = o."companyId",
  "companyName" = o."companyName"
FROM "Order" AS o
WHERE oi."orderId" = o."id";

ALTER TABLE "OrderItem" ALTER COLUMN "companyId" SET NOT NULL;
ALTER TABLE "OrderItem" ALTER COLUMN "companyName" SET NOT NULL;

CREATE INDEX "OrderItem_companyId_idx" ON "OrderItem"("companyId");