unit tests fixin

src/tests/setup/integration-global-setup.ts

@@ -2,6 +2,7 @@ import { exec } from 'child_process';
 import { setup as globalSetup } from './global-setup';
 import { pingBackend } from '../../services/apiClient'; 
 import { logger } from '../../services/logger';
+import { pool } from '../../services/db/connection';
 
 export async function setup() {
   console.log('\n--- Running Integration Test Setup ---');
@@ -59,4 +60,7 @@ export async function setup() {
 
 export async function teardown() {
   console.log('--- Integration Test Teardown ---');
+  // Close the database connection pool after all integration tests have run.
+  // This prevents the "hanging-process" error.
+  await pool.end();
 }