There cant be two bearbeitet entities in the db featuring the same cache and user

src/main/java/hhn/labsw/bugageocaching/controller/Controller.java

@@ -126,7 +126,6 @@ public class Controller {
             .setSigningKey(key)
             .parseClaimsJws(token).getBody();
 
-
         User user = userRepository.findByUsername(claims.getSubject());
         if (user == null) {
           return ResponseEntity.status(404).body("User was not found");
@@ -136,6 +135,12 @@ public class Controller {
         Optional<Cache> cacheOptional = cacheRepository.findById(Integer.valueOf(cacheID));
         if (cacheOptional.isPresent()) {
           Cache cache = cacheOptional.get();
+
+          if(bearbeitetRepository.findByUserAndCache(user, cache) != null){
+            Bearbeitet bearbeitet1 = bearbeitetRepository.findByUserAndCache(user, cache);
+            return ResponseEntity.status(400).body(bearbeitet1.getAktuelleStation());
+          }
+
           bearbeitet.setCache(cache);
 
         Station startStation = cache.getStationen().get(0);

src/main/java/hhn/labsw/bugageocaching/repositories/BearbeitetRepository.java

@@ -1,8 +1,11 @@
 package hhn.labsw.bugageocaching.repositories;
 
 import hhn.labsw.bugageocaching.entities.Bearbeitet;
+import hhn.labsw.bugageocaching.entities.Cache;
+import hhn.labsw.bugageocaching.entities.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.repository.CrudRepository;
 
 public interface BearbeitetRepository extends JpaRepository<Bearbeitet, Integer> {
+  Bearbeitet findByUserAndCache(User user, Cache cache);
 }