fix(history): avoid duplicate history IDs in persistence

lib/providers/history_providers.dart

@@ -85,9 +85,7 @@ class HistoryMetaStateNotifier
   void addHistoryRequest(HistoryRequestModel model) async {
     final id = model.historyId;
     state = {...state ?? {}, id: model.metaData};
-    final List<String> updatedHistoryKeys = state == null
-        ? [id]
-        : [...state!.keys, id];
+    final List<String> updatedHistoryKeys = state?.keys.toList() ?? <String>[];
     hiveHandler.setHistoryIds(updatedHistoryKeys);
     hiveHandler.setHistoryMeta(id, model.metaData.toJson());
     await hiveHandler.setHistoryRequest(id, model.toJson());

test/providers/history_providers_test.dart

@@ -0,0 +1,41 @@
+import 'package:apidash/models/models.dart';
+import 'package:apidash/providers/providers.dart';
+import 'package:apidash/services/services.dart';
+import 'package:apidash_core/apidash_core.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'helpers.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() async {
+    await testSetUpTempDirForHive();
+  });
+
+  test('addHistoryRequest persists unique history ids only', () async {
+    final container = createContainer();
+    final notifier = container.read(historyMetaStateNotifier.notifier);
+
+    final historyId = getNewUuid();
+    final model = HistoryRequestModel(
+      historyId: historyId,
+      metaData: HistoryMetaModel(
+        historyId: historyId,
+        requestId: getNewUuid(),
+        apiType: APIType.rest,
+        url: 'https://api.apidash.dev',
+        method: HTTPVerb.get,
+        responseStatus: 200,
+        timeStamp: DateTime.now(),
+      ),
+      httpResponseModel: const HttpResponseModel(),
+    );
+
+    notifier.addHistoryRequest(model);
+    await Future<void>.delayed(const Duration(milliseconds: 50));
+
+    final historyIds = hiveHandler.getHistoryIds() as List<String>?;
+    expect(historyIds, isNotNull);
+    expect(historyIds, [historyId]);
+  });
+}