diff --git a/src/main/java/com/faf223/expensetrackerfaf/config/SecurityConfiguration.java b/src/main/java/com/faf223/expensetrackerfaf/config/SecurityConfiguration.java
index c95f0f8..7343ab9 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/config/SecurityConfiguration.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/config/SecurityConfiguration.java
@@ -43,34 +43,7 @@ public class SecurityConfiguration {
                 .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                 .authenticationProvider(authenticationProvider)
                 .addFilterBefore(jwtAuthFilter, UsernamePasswordAuthenticationFilter.class); // will be executed before UsernamePasswordAuthenticationFilter
-//                .oauth2Login(Customizer.withDefaults());
-
         return http.build();
     }
 
-    @Bean
-    public ClientRegistrationRepository clientRegistrationRepository(
-            @Value("${spring.security.oauth2.client.registration.google.client-id}") String clientId,
-            @Value("${spring.security.oauth2.client.registration.google.client-secret}") String clientSecret) {
-
-        ClientRegistration registration = ClientRegistration.withRegistrationId("google")
-                .clientId(clientId)
-                .clientSecret(clientSecret)
-                .clientName("Google")
-                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
-                .redirectUri("http://localhost:8081/login/oauth2/code/{registrationId}")
-                .scope("openid", "profile", "email")
-                .authorizationUri("https://accounts.google.com/o/oauth2/auth")
-                .tokenUri("https://accounts.google.com/o/oauth2/token")
-                .userInfoUri("https://www.googleapis.com/oauth2/v3/userinfo")
-                .userNameAttributeName(IdTokenClaimNames.SUB)
-                .build();
-
-        return new InMemoryClientRegistrationRepository(registration);
-    }
-
-    @Bean
-    public OAuth2UserService<OAuth2UserRequest, OAuth2User> oAuth2UserService() {
-        return new DefaultOAuth2UserService();
-    }
 }
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java b/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
index 6bdccb1..5b09733 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
@@ -1,10 +1,8 @@
 package com.faf223.expensetrackerfaf.model;
+import com.faf223.expensetrackerfaf.util.IMoneyTransaction;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import jakarta.persistence.*;
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.ToString;
-import lombok.NoArgsConstructor;
+import lombok.*;
 
 import java.math.BigDecimal;
 import java.time.LocalDate;
@@ -13,10 +11,11 @@ import java.time.LocalDate;
 @AllArgsConstructor
 @NoArgsConstructor
 @Entity(name = "expenses")
-public class Expense {
+public class Expense implements IMoneyTransaction {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long expenseId;
+    @Column(name = "expense_id")
+    private Long id;
 
     @ManyToOne()
     @JoinColumn(name = "user_uuid")
@@ -30,5 +29,13 @@ public class Expense {
 
     private LocalDate date;
     private BigDecimal amount;
-}
 
+    public Expense(LocalDate date, BigDecimal amount) {
+    }
+
+    public Expense(ExpenseCategory expenseCategory, LocalDate date, BigDecimal amount) {
+        this.category = expenseCategory;
+        this.date = date;
+        this.amount = amount;
+    }
+}
\ No newline at end of file