fixed transaction order in CSV export

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/api/AccountingService.java

@@ -31,7 +31,7 @@ public interface AccountingService {
 			var keys = List.of(Field.DATE, Field.SOURCE, Field.AMOUNT, Field.DESTINATION, Field.PURPOSE,Field.TAGS);
 			var sb = new StringBuilder();
 			keys.stream().map(Translatable::t).forEach(field -> sb.append(field).append(";"));
-			transactions.stream().sorted(Comparator.comparing(Transaction::id))
+			transactions.stream().sorted()
 					.map(transaction -> transaction.csvLine(users, keys,";"))
 					.forEach(line -> sb.append("\n").append(line));
 			return sb.toString().getBytes(UTF_8);

core/src/main/java/de/srsoftware/umbrella/core/model/Transaction.java

@@ -12,7 +12,7 @@ import java.time.ZoneOffset;
 import java.util.*;
 import java.util.stream.Collectors;
 
-public class Transaction extends UmbrellaObject {
+public class Transaction extends UmbrellaObject implements Comparable<Transaction>{
 	private final long accountId;
 	private LocalDateTime date;
 	private IdOrString source, destination;
@@ -51,6 +51,12 @@ public class Transaction extends UmbrellaObject {
 		return this;
 	}
 
+	@Override
+	public int compareTo(Transaction other) {
+		var order = date.compareTo(other.date);
+		return order == 0 ? Long.compare(id(), other.id()) : order;
+	}
+
 	public String csvLine(Map<Long, UmbrellaUser> users, List<String> keys, String delimiter) {
 		return keys.stream().map(this::get).map(o -> resolveUsers(users,o)).map(o -> quote(o, delimiter)).collect(Collectors.joining(delimiter));
 	}