Refactor Prisma client usage and enhance service integration for improved connection management

src/common/database/prisma.lambda.service.ts

@@ -1,22 +1,5 @@
-import { PrismaClient } from '@prisma/client';
-import { PrismaPg } from '@prisma/adapter-pg';
-
-const adapter = new PrismaPg({
-  connectionString: process.env.DATABASE_URL!,
-});
-
-let prisma: PrismaClient;
-
-if (!(global as any).prisma) {
-  (global as any).prisma = new PrismaClient({
-    adapter,
-    log:
-      process.env.NODE_ENV === 'dev'
-        ? ['query', 'info', 'warn', 'error']
-        : ['error'],
-  });
-}
-
-prisma = (global as any).prisma;
+// Re-export the singleton prisma client for Lambda handlers
+// This ensures all Lambda functions use the same cached connection
+import { prisma } from './prisma.client';
 
 export const prismaClient = prisma;