🗃️ Local keypair db

lib/types/keypair.dart

@@ -0,0 +1,16 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'keypair.freezed.dart';
+part 'keypair.g.dart';
+
+@freezed
+abstract class SnKeyPair with _$SnKeyPair {
+  const factory SnKeyPair({
+    required String id,
+    required int accountId,
+    required String publicKey,
+    String? privateKey,
+  }) = _SnKeyPair;
+
+  factory SnKeyPair.fromJson(Map<String, Object?> json) => _$SnKeyPairFromJson(json);
+}