added beneficiary deletion feature

src/services/beneficiary.service.js

@@ -44,6 +44,16 @@ async function getSingleBeneficiary(customerNo, accountNo) {
   return result.rows[0];
 }
 
+async function deleteBeneficiary(customerNo, beneficiaryAccountNo) {
+  const queryStr =
+    'DELETE FROM beneficiaries WHERE customer_no = $1 AND account_no = $2';
+  const result = await db.query(queryStr, [customerNo, beneficiaryAccountNo]);
+  if (result.rowCount == 0) {
+    throw new Error('ACCOUNT_NOT_FOUND');
+  }
+  return;
+}
+
 async function getAllBeneficiaries(customerNo) {
   const queryStr =
     'SELECT b.account_no, b.name, b.account_type, b.ifsc_code, i.bank_name, i.branch_name FROM beneficiaries b JOIN ifsc_details i ON b.ifsc_code = i.ifsc_code WHERE customer_no = $1';
@@ -66,4 +76,5 @@ module.exports = {
   validateOutsideBank,
   getAllBeneficiaries,
   getSingleBeneficiary,
+  deleteBeneficiary,
 };