diff --git a/pom.xml b/pom.xml
index ffad089..f38313e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -36,7 +36,11 @@
             <scope>test</scope>
             <version>3.1.2</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
         <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/Categories.java b/src/main/java/com/faf223/expensetrackerfaf/model/Categories.java
index d30264f..a309f85 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/Categories.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/Categories.java
@@ -1,3 +1,4 @@
+
 package com.faf223.expensetrackerfaf.model;
 
 public class Categories {
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java b/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
index 1ffbec4..48f80c4 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/Expense.java
@@ -1,26 +1,43 @@
+
 package com.faf223.expensetrackerfaf.model;
-
 import com.faf223.expensetrackerfaf.util.IMoneyTransaction;
+import jakarta.persistence.*;
 
+@Entity
+@Table(name = "expense")
 public class Expense implements IMoneyTransaction {
 
-    private int userId;
+    @Id
+    @Column(name = "id")
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id", referencedColumnName = "id")
+    private User user;
     private int amount;
     private Categories.ExpenseCategory category;
 
-    public Expense(int userId, int amount, Categories.ExpenseCategory category) {
-        this.userId = userId;
+    public Expense(User user, int amount, Categories.ExpenseCategory category) {
+        this.user = user;
         this.amount = amount;
         this.category = category;
     }
 
+    public Expense() {}
+
     @Override
-    public long getUserId() {
-        return userId;
+    public User getUser() {
+        return user;
     }
 
     public void setUserId(int userId) {
-        this.userId = userId;
+        this.user = user;
+    }
+
+    @Override
+    public long getUserId() {
+        return 0;
     }
 
     @Override
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/Income.java b/src/main/java/com/faf223/expensetrackerfaf/model/Income.java
index a3449e5..098c4de 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/Income.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/Income.java
@@ -1,22 +1,39 @@
 package com.faf223.expensetrackerfaf.model;
 
 import com.faf223.expensetrackerfaf.util.IMoneyTransaction;
+import jakarta.persistence.*;
 
+@Entity
+@Table(name = "income")
 public class Income implements IMoneyTransaction {
 
-    private long userId;
+    @Id
+    @Column(name = "id")
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id", referencedColumnName = "id")
+    private User user;
     private int amount;
     private Categories.IncomeCategory category;
 
-    public Income(long userId, int amount, Categories.IncomeCategory category) {
-        this.userId = userId;
+    public Income(User user, int amount, Categories.IncomeCategory category) {
+        this.user = user;
         this.amount = amount;
         this.category = category;
     }
 
+    public Income() {}
+
+    @Override
+    public User getUser() {
+        return user;
+    }
+
     @Override
     public long getUserId() {
-        return userId;
+        return 0;
     }
 
     @Override
@@ -29,8 +46,8 @@ public class Income implements IMoneyTransaction {
         return category.getEffectiveName();
     }
 
-    public void setUserId(long userId) {
-        this.userId = userId;
+    public void setUserId(User user) {
+        this.user = user;
     }
 
     public void setAmount(int amount) {
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/Role.java b/src/main/java/com/faf223/expensetrackerfaf/model/Role.java
index d241cf8..d9393e8 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/Role.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/Role.java
@@ -1,7 +1,6 @@
+
 package com.faf223.expensetrackerfaf.model;
 
 public enum Role {
-
     UNREGISTERED, REGISTERED, ADMIN;
-
 }
diff --git a/src/main/java/com/faf223/expensetrackerfaf/model/User.java b/src/main/java/com/faf223/expensetrackerfaf/model/User.java
index 35fe0fc..65ed712 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/model/User.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/model/User.java
@@ -1,12 +1,25 @@
+
 package com.faf223.expensetrackerfaf.model;
+import jakarta.persistence.*;
 
 import java.util.List;
 
+@Entity
+@Table(name = "User")
 public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private long id;
-    private String name, email, login, password;
+    private String name;
+    private String email;
+    private String login;
+    private String password;
     private Role role;
+
+    @OneToMany(mappedBy = "user")
     private List<Expense> expenses;
+
+    @OneToMany(mappedBy = "user")
     private List<Income> incomes;
 
     public User(long id, String name, String email, String login, String password, Role role, List<Expense> expenses, List<Income> incomes) {
diff --git a/src/main/java/com/faf223/expensetrackerfaf/security/PersonDetails.java b/src/main/java/com/faf223/expensetrackerfaf/security/PersonDetails.java
new file mode 100644
index 0000000..36842c8
--- /dev/null
+++ b/src/main/java/com/faf223/expensetrackerfaf/security/PersonDetails.java
@@ -0,0 +1,59 @@
+package com.faf223.expensetrackerfaf.security;
+
+import com.faf223.expensetrackerfaf.entities.Role;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import java.util.Collection;
+import java.util.List;
+
+public class PersonDetails implements UserDetails {
+
+    private final User user;
+
+    @Enumerated(EnumType.STRING)
+    private Role role;
+
+    public PersonDetails(User user) {
+        this.user = user;
+    }
+
+    @Override
+    public Collection<? extends GrantedAuthority> getAuthorities() {
+        return List.of(new SimpleGrantedAuthority(role.name()));
+    }
+
+    @Override
+    public String getPassword() {
+        return user.getPassword();
+    }
+
+    @Override
+    public String getUsername() {
+        return user.getUsername();
+    }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return true;
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return true;
+    }
+}
diff --git a/src/main/java/com/faf223/expensetrackerfaf/util/IMoneyTransaction.java b/src/main/java/com/faf223/expensetrackerfaf/util/IMoneyTransaction.java
index 2eb4488..7dfe2fd 100644
--- a/src/main/java/com/faf223/expensetrackerfaf/util/IMoneyTransaction.java
+++ b/src/main/java/com/faf223/expensetrackerfaf/util/IMoneyTransaction.java
@@ -1,7 +1,11 @@
 package com.faf223.expensetrackerfaf.util;
 
+import com.faf223.expensetrackerfaf.model.User;
+
 public interface IMoneyTransaction {
 
+    User getUser();
+
     long getUserId();
     int getAmount();
     String getCategory();