Implemented service, repository and controller for each entity

src/main/java/com/faf223/expensetrackerfaf/model/Credential.java

@@ -0,0 +1,20 @@
+package com.faf223.expensetrackerfaf.model;
+
+import jakarta.persistence.*;
+import lombok.Data;
+
+@Data
+@Entity(name = "credentials")
+public class Credential {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long credentialId;
+
+    @ManyToOne
+    @JoinColumn(name = "user_uuid")
+    private User user;
+
+    private String email;
+    private String password;
+}
+