diff --git a/backend/build.gradle b/backend/build.gradle
index 7811350..4ea0a22 100644
--- a/backend/build.gradle
+++ b/backend/build.gradle
@@ -14,7 +14,6 @@ repositories {
 }
 
 dependencies {
-	implementation 'org.springframework.boot:spring-boot-starter-data-rest'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'org.springframework.boot:spring-boot-starter-actuator'
diff --git a/backend/src/main/java/de/hft/geotime/record/RecordRepository.java b/backend/src/main/java/de/hft/geotime/record/RecordRepository.java
new file mode 100644
index 0000000..22b7906
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/record/RecordRepository.java
@@ -0,0 +1,7 @@
+package de.hft.geotime.record;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface RecordRepository extends CrudRepository<TimeRecord, Long> {
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/record/RecordType.java b/backend/src/main/java/de/hft/geotime/record/RecordType.java
new file mode 100644
index 0000000..0adab48
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/record/RecordType.java
@@ -0,0 +1,8 @@
+package de.hft.geotime.record;
+
+public enum RecordType {
+
+    BREAK,
+    PAID
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/record/TimeRecord.java b/backend/src/main/java/de/hft/geotime/record/TimeRecord.java
new file mode 100644
index 0000000..3280d37
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/record/TimeRecord.java
@@ -0,0 +1,29 @@
+package de.hft.geotime.record;
+
+import de.hft.geotime.timetrackaccount.TimetrackAccount;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import java.time.Duration;
+import java.util.Date;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class TimeRecord {
+
+    @Id
+    private long id;
+    @OneToOne
+    private TimetrackAccount account;
+    private Date startdate;
+    private Date enddate;
+    private Duration time;
+    private RecordType type;
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/role/Role.java b/backend/src/main/java/de/hft/geotime/role/Role.java
new file mode 100644
index 0000000..7b319b7
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/role/Role.java
@@ -0,0 +1,24 @@
+package de.hft.geotime.role;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class Role {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+    private String name;
+    // TODO: Permission List
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/role/RoleRepository.java b/backend/src/main/java/de/hft/geotime/role/RoleRepository.java
new file mode 100644
index 0000000..7e26fa7
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/role/RoleRepository.java
@@ -0,0 +1,7 @@
+package de.hft.geotime.role;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface RoleRepository extends CrudRepository<Role, Long> {
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccount.java b/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccount.java
new file mode 100644
index 0000000..f44e6c8
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccount.java
@@ -0,0 +1,25 @@
+package de.hft.geotime.timetrackaccount;
+
+import de.hft.geotime.user.User;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+public class TimetrackAccount {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+    @OneToOne
+    private User user;
+    private double revenue;
+    private String name;
+    private String description;
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccountRepository.java b/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccountRepository.java
new file mode 100644
index 0000000..38bbc91
--- /dev/null
+++ b/backend/src/main/java/de/hft/geotime/timetrackaccount/TimetrackAccountRepository.java
@@ -0,0 +1,7 @@
+package de.hft.geotime.timetrackaccount;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface TimetrackAccountRepository extends CrudRepository<TimetrackAccount, Long> {
+
+}
diff --git a/backend/src/main/java/de/hft/geotime/user/User.java b/backend/src/main/java/de/hft/geotime/user/User.java
index f697365..70c1b6e 100644
--- a/backend/src/main/java/de/hft/geotime/user/User.java
+++ b/backend/src/main/java/de/hft/geotime/user/User.java
@@ -1,13 +1,17 @@
 package de.hft.geotime.user;
 
+import de.hft.geotime.role.Role;
+import de.hft.geotime.timetrackaccount.TimetrackAccount;
+import lombok.AllArgsConstructor;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
-import javax.persistence.Id;
+import javax.persistence.*;
+import java.util.List;
 
 @Data
+@NoArgsConstructor
+@AllArgsConstructor
 @Entity
 public class User {
 
@@ -17,14 +21,9 @@ public class User {
     private String username;
     private String firstname;
     private String lastname;
-    //TODO: roleid(FK)
-    //TODO: timetrackaccounts[List]
+    @OneToMany
+    private List<Role> roles;
+    @OneToMany
+    private List<TimetrackAccount> timetrackAccounts;
 
-    protected User() {
-    }
-
-    public User(String firstname, String lastname) {
-        this.firstname = firstname;
-        this.lastname = lastname;
-    }
 }
diff --git a/backend/src/main/java/de/hft/geotime/user/UserRepository.java b/backend/src/main/java/de/hft/geotime/user/UserRepository.java
index 9b303ba..2755da1 100644
--- a/backend/src/main/java/de/hft/geotime/user/UserRepository.java
+++ b/backend/src/main/java/de/hft/geotime/user/UserRepository.java
@@ -1,13 +1,11 @@
 package de.hft.geotime.user;
 
-import org.springframework.data.repository.PagingAndSortingRepository;
-import org.springframework.data.rest.core.annotation.RepositoryRestResource;
+import org.springframework.data.repository.CrudRepository;
 
 import javax.websocket.server.PathParam;
 import java.util.List;
 
-@RepositoryRestResource
-public interface UserRepository extends PagingAndSortingRepository<User, Long> {
+public interface UserRepository extends CrudRepository<User, Long> {
 
     List<User> findByUsername(@PathParam("username") String username);
 
diff --git a/backend/src/main/resources/application-dev.properties b/backend/src/main/resources/application-dev.properties
index e69de29..4497ed1 100644
--- a/backend/src/main/resources/application-dev.properties
+++ b/backend/src/main/resources/application-dev.properties
@@ -0,0 +1,7 @@
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.h2.console.enabled=true
+spring.h2.console.path=/h2-console
\ No newline at end of file
diff --git a/backend/src/main/resources/application.properties b/backend/src/main/resources/application.properties
index 1cf2a4f..cae4ac3 100644
--- a/backend/src/main/resources/application.properties
+++ b/backend/src/main/resources/application.properties
@@ -1,5 +1,4 @@
 server.port=80
-spring.data.rest.basePath=/api
 spring.datasource.hikari.initialization-fail-timeout=0
 spring.datasource.hikari.max-lifetime=300000
 spring.profiles.active=prod
\ No newline at end of file