cretaed entities for BillerDetail

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

@@ -0,0 +1,46 @@
+package com.billpaymentservice.bbps.entites;
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.List;
+
+@Getter
+@Setter
+@Entity
+@Table(name = "biller_groups")
+public class Group {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "group_id")
+    private Long id;
+
+    @Column(name = "group_name")
+    private String name;
+
+    @Column(name = "input")
+    private String input;
+
+    // Example: "Admission No/Application No/GR No" → stored as multiple params
+    @ElementCollection
+    @CollectionTable(name = "group_params", joinColumns = @JoinColumn(name = "group_id"))
+    @Column(name = "param_name")
+    private List<String> params;
+
+    // 🔗 Parent group relationship (for nested groups)
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "parent_group_id")
+    private Group parentGroup;
+
+    // 🔁 Child groups (self-reference)
+    @OneToMany(mappedBy = "parentGroup", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Group> groups;
+
+    // 🔗 Back reference to CustomerParamGroups
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "group_container_id")
+    private CustomerParamGroups customerParamGroups;
+}