-- CreateTable
CREATE TABLE "purchase_order_archives" (
    "id" UUID NOT NULL,
    "purchase_request_id" UUID NOT NULL,
    "po_no" TEXT NOT NULL,
    "contract_no" TEXT,
    "archived_files" JSONB,
    "archived_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "archived_by" UUID NOT NULL,

    CONSTRAINT "purchase_order_archives_pkey" PRIMARY KEY ("id")
);

-- CreateIndex
CREATE UNIQUE INDEX "purchase_order_archives_purchase_request_id_key" ON "purchase_order_archives"("purchase_request_id");

-- CreateIndex
CREATE INDEX "idx_purchase_order_archives_archived_by" ON "purchase_order_archives"("archived_by");

-- CreateIndex
CREATE INDEX "idx_purchase_order_archives_archived_at" ON "purchase_order_archives"("archived_at");

-- AddForeignKey
ALTER TABLE "purchase_order_archives" ADD CONSTRAINT "purchase_order_archives_purchase_request_id_fkey" FOREIGN KEY ("purchase_request_id") REFERENCES "purchase_requests"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "purchase_order_archives" ADD CONSTRAINT "purchase_order_archives_archived_by_fkey" FOREIGN KEY ("archived_by") REFERENCES "employees"("id") ON DELETE RESTRICT ON UPDATE CASCADE;