improved the error handling and updated link paymentstartrecord and transactionmaster

src/main/java/com/billpaymentservice/bbps/entites/TransactionMaster.java

@@ -2,6 +2,7 @@ package com.billpaymentservice.bbps.entites;
 
 import java.util.List;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
 import jakarta.persistence.CascadeType;
@@ -9,6 +10,8 @@ import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToOne;
 import jakarta.persistence.OneToMany;
 import jakarta.persistence.Table;
 import lombok.AllArgsConstructor;
@@ -149,6 +152,12 @@ public class TransactionMaster extends Auditable {
     @OneToMany(mappedBy = "transactionMaster", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
     private List<CustomerParamTransaction> customerParams;
 
+    // ✅ Relation with PaymentStartRecord (one-to-one)
+    @OneToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "payment_ref_id", referencedColumnName = "txn_id", insertable = false, updatable = false)
+    @JsonIgnore
+    private PaymentStartRecord paymentStartRecord;
+
     @Column(name = "plan_id")
     private String planId;