diff --git a/src/main/java/de/pnreichmuth/timekeep_backend/entities/Racer.java b/src/main/java/de/pnreichmuth/timekeep_backend/entities/Racer.java
index 8e27c12..b82ecec 100644
--- a/src/main/java/de/pnreichmuth/timekeep_backend/entities/Racer.java
+++ b/src/main/java/de/pnreichmuth/timekeep_backend/entities/Racer.java
@@ -3,11 +3,11 @@ package de.pnreichmuth.timekeep_backend.entities;
 import jakarta.persistence.*;
 import lombok.*;
 
+import java.util.Objects;
 import java.util.UUID;
 
 @Entity
 @Data
-@AllArgsConstructor
 @NoArgsConstructor
 public class Racer{
     @Id
@@ -19,7 +19,13 @@ public class Racer{
     private Boolean isFirstSemester;
     private String phoneNumber;
 
+    @ManyToOne
+    @JoinColumn(name = "member_team_id")
+    private Team memberTeam;
+
     public Racer(String firstName, String lastName, Boolean isFirstSemester, String phoneNumber){
+        Objects.requireNonNull(firstName, "firstName must be set");
+        Objects.requireNonNull(lastName, "lastName must be set");
         this.firstName = firstName;
         this.lastName = lastName;
         this.isFirstSemester = isFirstSemester;