complete new audit system

backend/src/services/contractTask.service.ts

@@ -1,6 +1,5 @@
-import { PrismaClient, ContractTaskStatus } from '@prisma/client';
-
-const prisma = new PrismaClient();
+import { ContractTaskStatus } from '@prisma/client';
+import prisma from '../lib/prisma.js';
 
 export interface ContractTaskFilters {
   contractId: number;