R49 合同台账增强：金额分类、筛选、到期预警、续约与导出

server/prisma/migrations/20260404090000_r49_contract_registry_enhancements/migration.sql

@@ -0,0 +1,17 @@
+-- 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");