OZG-6867 OZG-6906 adopt data types and default values

src/main/java/de/ozgcloud/admin/organisationseinheit/OrganisationsEinheit.java

@@ -30,7 +30,7 @@ public class OrganisationsEinheit {
 	@JsonIgnore
 	private String zufiId;
 	@JsonIgnore
-	private long lastSyncTimestamp;
+	private Long lastSyncTimestamp;
 	@JsonIgnore
 	private String parentId;
 	@JsonIgnore
@@ -40,5 +40,6 @@ public class OrganisationsEinheit {
 	private String name;
 	private String organisationsEinheitId;
 	private SyncResult syncResult;
-	private OrganisationsEinheitSettings settings;
+	@Builder.Default
+	private OrganisationsEinheitSettings settings = new OrganisationsEinheitSettings(null);
 }
\ No newline at end of file