returning a valid response after creating a beneficiary

also throw 409 status code if account already exists in beneficiaries table against that customer

src/controllers/beneficiary.controller.js

@@ -54,8 +54,15 @@ async function addBeneficiary(req, res) {
     const query =
       'INSERT INTO beneficiaries (customer_no, account_no, account_type, ifsc_code, name) VALUES ($1, $2, $3, $4, $5)';
     await db.query(query, [customerNo, accountNo, accountType, ifscCode, name]);
+    res.json({ message: 'SUCCESS' });
   } catch (error) {
     logger.error(error, 'Error adding beneficiary');
+    if (
+      error.message ==
+      'duplicate key value violates unique constraint "beneficiaries_pkey"'
+    ) {
+      res.status(409).json({ error: 'BENEFICIARY_ALREADY_EXITS' });
+    }
     res.status(500).json({ error: 'INTERNAL_SERVER_ERROR' });
   }
 }