-- CreateEnum
CREATE TYPE "ContractRegistryType" AS ENUM ('purchase', 'sales', 'service', 'framework', 'other');

-- AlterTable
ALTER TABLE "contract_registry"
  ADD COLUMN "contract_type" "ContractRegistryType" NOT NULL DEFAULT 'other',
  ADD COLUMN "amount" DECIMAL(14, 2),
  ADD COLUMN "currency" VARCHAR(8) NOT NULL DEFAULT 'CNY',
  ADD COLUMN "signed_date" DATE,
  ADD COLUMN "effective_date" DATE,
  ADD COLUMN "expiry_date" DATE;

-- CreateIndex
CREATE INDEX "idx_contract_registry_status_expiry" ON "contract_registry"("status", "expiry_date");

-- CreateIndex
CREATE INDEX "idx_contract_registry_type_status" ON "contract_registry"("contract_type", "status");