opencrm/backend/prisma/migrations/20260204074019_add_billing_address/migration.sql

-- AlterTable
ALTER TABLE `Contract` ADD COLUMN `billingAddressId` INTEGER NULL;

-- AddForeignKey
ALTER TABLE `Contract` ADD CONSTRAINT `Contract_billingAddressId_fkey` FOREIGN KEY (`billingAddressId`) REFERENCES `Address`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;