update isar address class

lib/models/isar/models/address/address.dart

@@ -8,12 +8,16 @@ class AddressException extends SWException {
   AddressException(super.message);
 }
 
-@Collection(inheritance: true)
+@collection
 class Address extends CryptoCurrencyAddress {
   Id id = Isar.autoIncrement;
 
+  @Index(unique: true, replace: true)
+  late String value;
+
   late List<byte> publicKey;
 
+  @Index()
   late int derivationIndex;
 
   @enumerated

lib/models/isar/models/address/crypto_currency_address.dart

@@ -1,6 +1,3 @@
 abstract class CryptoCurrencyAddress {
-  late String value;
-
-  @override
-  String toString() => value;
+// future use?
 }