Remove accounts references from User

backend/src/main/java/de/hft/geotime/entities/TimetrackAccount.java

@@ -20,7 +20,6 @@ public class TimetrackAccount {
     private String name;
     private String description;
 
-    @JsonBackReference
     @ManyToOne
     private TimetrackUser user;
 

backend/src/main/java/de/hft/geotime/entities/TimetrackUser.java

@@ -32,10 +32,6 @@ public class TimetrackUser {
     @ManyToOne(fetch = FetchType.EAGER)
     private Role role;
 
-    @JsonManagedReference
-    @OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
-    private List<TimetrackAccount> accounts;
-
     @ManyToOne
     private Location location;