Annotate recursive methods as JsonIgnore

src/main/java/nl/tudelft/ewi/auta/common/model/entity/Entity.java

@@ -25,6 +25,7 @@ public class Entity {
      * The parent of this entity.
      */
     @Nullable
+    @JsonIgnore
     private transient Entity parent;
 
     /**
@@ -194,6 +195,7 @@ public class Entity {
      * @return the parent of this entity
      */
     @Nullable
+    @JsonIgnore
     public Entity getParent() {
         return this.parent;
     }