diff --git a/demo/build.gradle b/demo/build.gradle
index edd4116..3be5b78 100644
--- a/demo/build.gradle
+++ b/demo/build.gradle
@@ -22,8 +22,14 @@ ext {
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.springframework.modulith:spring-modulith-starter-core'
+
     implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.4.0'
+
     implementation 'org.modelmapper:modelmapper:3.1.1'
+
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'com.h2database:h2:2.2.224'
+
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.modulith:spring-modulith-starter-test'
 }
diff --git a/demo/src/main/java/com/example/demo/core/config/Constants.java b/demo/src/main/java/com/example/demo/core/config/Constants.java
index 6efe2d1..c62b4c9 100644
--- a/demo/src/main/java/com/example/demo/core/config/Constants.java
+++ b/demo/src/main/java/com/example/demo/core/config/Constants.java
@@ -1,5 +1,5 @@
 package com.example.demo.core.config;
 
 public class Constants {
-    public static final String API_URL = "/api_2";
+    public static final String API_URL = "/api_3";
 }
diff --git a/demo/src/main/java/com/example/demo/games/repository/GameRepository.java b/demo/src/main/java/com/example/demo/games/repository/GameRepository.java
index 3755849..c09c98b 100644
--- a/demo/src/main/java/com/example/demo/games/repository/GameRepository.java
+++ b/demo/src/main/java/com/example/demo/games/repository/GameRepository.java
@@ -1,10 +1,7 @@
 package com.example.demo.games.repository;
-
-import com.example.demo.core.repository.MapRepository;
 import com.example.demo.games.model.GameEntity;
-import org.springframework.stereotype.Repository;
+import org.springframework.data.repository.CrudRepository;
 
-@Repository
-public class GameRepository extends MapRepository<GameEntity> {
+public interface GameRepository extends CrudRepository<GameEntity, Long> {
 
 }
diff --git a/demo/src/main/java/com/example/demo/tables/repository/TableRepository.java b/demo/src/main/java/com/example/demo/tables/repository/TableRepository.java
index c03acab..6d7bfa9 100644
--- a/demo/src/main/java/com/example/demo/tables/repository/TableRepository.java
+++ b/demo/src/main/java/com/example/demo/tables/repository/TableRepository.java
@@ -1,10 +1,8 @@
 package com.example.demo.tables.repository;
 
-import com.example.demo.core.repository.MapRepository;
 import com.example.demo.tables.model.TableEntity;
-import org.springframework.stereotype.Repository;
+import org.springframework.data.repository.CrudRepository;
 
-@Repository
-public class TableRepository extends MapRepository<TableEntity> {
+public interface TableRepository extends CrudRepository<TableEntity, Long> {
 
 }
diff --git a/demo/src/main/java/com/example/demo/users/repository/UserRepository.java b/demo/src/main/java/com/example/demo/users/repository/UserRepository.java
index ac2ef22..49d2fd9 100644
--- a/demo/src/main/java/com/example/demo/users/repository/UserRepository.java
+++ b/demo/src/main/java/com/example/demo/users/repository/UserRepository.java
@@ -1,10 +1,7 @@
 package com.example.demo.users.repository;
 
-import com.example.demo.core.repository.MapRepository;
 import com.example.demo.users.model.UserEntity;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public class UserRepository extends MapRepository<UserEntity> {
+import org.springframework.data.repository.CrudRepository;
+public interface UserRepository extends CrudRepository<UserEntity, Long> {
 
 }