diff --git a/lib/data/repository/config_options_store.dart b/lib/data/repository/config_options_store.dart
index 53a27e79..5cc6e763 100644
--- a/lib/data/repository/config_options_store.dart
+++ b/lib/data/repository/config_options_store.dart
@@ -51,8 +51,12 @@ final tunImplementationStore = PrefNotifier.provider(
 final mtuStore = PrefNotifier.provider("mtu", _default.mtu);
 final connectionTestUrlStore =
     PrefNotifier.provider("connection-test-url", _default.connectionTestUrl);
-final urlTestIntervalStore =
-    PrefNotifier.provider("url-test-interval", _default.urlTestInterval);
+final urlTestIntervalStore = PrefNotifier.provider<Duration, int>(
+  "url-test-interval",
+  _default.urlTestInterval,
+  mapFrom: (value) => Duration(seconds: value),
+  mapTo: (value) => value.inSeconds,
+);
 final enableClashApiStore =
     PrefNotifier.provider("enable-clash-api", _default.enableClashApi);
 final clashApiPortStore =
diff --git a/lib/features/proxies/notifier/proxies_notifier.dart b/lib/features/proxies/notifier/proxies_notifier.dart
index f7a49c66..53d3a5c0 100644
--- a/lib/features/proxies/notifier/proxies_notifier.dart
+++ b/lib/features/proxies/notifier/proxies_notifier.dart
@@ -26,12 +26,24 @@ enum ProxiesSort {
       };
 }
 
-final proxiesSortProvider = AlwaysAlivePrefNotifier.provider(
-  "proxies_sort_mode",
-  ProxiesSort.unsorted,
-  mapFrom: ProxiesSort.values.byName,
-  mapTo: (value) => value.name,
-);
+@Riverpod(keepAlive: true)
+class ProxiesSortNotifier extends _$ProxiesSortNotifier {
+  late final _pref = Pref(
+    ref.watch(sharedPreferencesProvider),
+    "proxies_sort_mode",
+    ProxiesSort.unsorted,
+    mapFrom: ProxiesSort.values.byName,
+    mapTo: (value) => value.name,
+  );
+
+  @override
+  ProxiesSort build() => _pref.getValue();
+
+  Future<void> update(ProxiesSort value) {
+    state = value;
+    return _pref.update(value);
+  }
+}
 
 @riverpod
 class ProxiesNotifier extends _$ProxiesNotifier with AppLogger {
@@ -42,7 +54,7 @@ class ProxiesNotifier extends _$ProxiesNotifier with AppLogger {
     if (!serviceRunning) {
       throw const CoreServiceNotRunning();
     }
-    final sortBy = ref.watch(proxiesSortProvider);
+    final sortBy = ref.watch(proxiesSortNotifierProvider);
     yield* ref
         .watch(coreFacadeProvider)
         .watchOutbounds()
diff --git a/lib/features/proxies/view/proxies_page.dart b/lib/features/proxies/view/proxies_page.dart
index 1651652e..92144cb1 100644
--- a/lib/features/proxies/view/proxies_page.dart
+++ b/lib/features/proxies/view/proxies_page.dart
@@ -16,7 +16,7 @@ class ProxiesPage extends HookConsumerWidget with PresLogger {
 
     final asyncProxies = ref.watch(proxiesNotifierProvider);
     final notifier = ref.watch(proxiesNotifierProvider.notifier);
-    final sortBy = ref.watch(proxiesSortProvider);
+    final sortBy = ref.watch(proxiesSortNotifierProvider);
 
     final selectActiveProxyMutation = useMutation(
       initialOnFailure: (error) =>
@@ -55,7 +55,8 @@ class ProxiesPage extends HookConsumerWidget with PresLogger {
                 actions: [
                   PopupMenuButton<ProxiesSort>(
                     initialValue: sortBy,
-                    onSelected: ref.read(proxiesSortProvider.notifier).update,
+                    onSelected:
+                        ref.read(proxiesSortNotifierProvider.notifier).update,
                     icon: const Icon(Icons.sort),
                     tooltip: t.proxies.sortTooltip,
                     itemBuilder: (context) {
diff --git a/lib/utils/pref_notifier.dart b/lib/utils/pref_notifier.dart
index d3cc6be4..90e6dfd3 100644
--- a/lib/utils/pref_notifier.dart
+++ b/lib/utils/pref_notifier.dart
@@ -3,7 +3,7 @@ import 'package:hiddify/utils/custom_loggers.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
-class Pref<T> with InfraLogger {
+class Pref<T, P> with InfraLogger {
   const Pref(
     this.prefs,
     this.key,
@@ -15,28 +15,28 @@ class Pref<T> with InfraLogger {
   final SharedPreferences prefs;
   final String key;
   final T defaultValue;
-  final T Function(String value)? mapFrom;
-  final String Function(T value)? mapTo;
+  final T Function(P value)? mapFrom;
+  final P Function(T value)? mapTo;
 
   /// Updates the value asynchronously.
   Future<void> update(T value) async {
     loggy.debug("updating preference [$key]($T) to [$value]");
+    Object? mapped = value;
+    if (mapTo != null) {
+      mapped = mapTo!(value);
+    }
     try {
-      if (mapTo != null && mapFrom != null) {
-        await prefs.setString(key, mapTo!(value));
-      } else {
-        switch (value) {
-          case String _:
-            await prefs.setString(key, value);
-          case bool _:
-            await prefs.setBool(key, value);
-          case int _:
-            await prefs.setInt(key, value);
-          case double _:
-            await prefs.setDouble(key, value);
-          case List<String> _:
-            await prefs.setStringList(key, value);
-        }
+      switch (mapped) {
+        case String _:
+          await prefs.setString(key, mapped);
+        case bool _:
+          await prefs.setBool(key, mapped);
+        case int _:
+          await prefs.setInt(key, mapped);
+        case double _:
+          await prefs.setDouble(key, mapped);
+        case List<String> _:
+          await prefs.setStringList(key, mapped);
       }
     } catch (e) {
       loggy.warning("error updating preference[$key]: $e");
@@ -46,11 +46,12 @@ class Pref<T> with InfraLogger {
   T getValue() {
     try {
       loggy.debug("getting persisted preference [$key]($T)");
-      if (mapTo != null && mapFrom != null) {
-        final persisted = prefs.getString(key);
-        return persisted != null ? mapFrom!(persisted) : defaultValue;
+      if (mapFrom != null) {
+        final persisted = prefs.get(key) as P?;
+        if (persisted == null) return defaultValue;
+        return mapFrom!(persisted);
       } else if (T == List<String>) {
-        return prefs.getStringList(key) as T ?? defaultValue;
+        return prefs.getStringList(key) as T? ?? defaultValue;
       }
       return prefs.get(key) as T? ?? defaultValue;
     } catch (e) {
@@ -60,132 +61,42 @@ class Pref<T> with InfraLogger {
   }
 }
 
-class PrefNotifier<T> extends AutoDisposeNotifier<T>
-    with _Prefs<T>, InfraLogger {
+class PrefNotifier<T, P> extends AutoDisposeNotifier<T> with InfraLogger {
   PrefNotifier(
-    this.key,
-    this.defaultValue,
-    this.mapFrom,
-    this.mapTo,
+    this._key,
+    this._defaultValue,
+    this._mapFrom,
+    this._mapTo,
   );
 
-  @override
-  final String key;
-  @override
-  final T defaultValue;
-  @override
-  final T Function(String)? mapFrom;
-  @override
-  final String Function(T)? mapTo;
+  final String _key;
+  final T _defaultValue;
+  final T Function(P value)? _mapFrom;
+  final P Function(T)? _mapTo;
 
-  static AutoDisposeNotifierProvider<PrefNotifier<T>, T> provider<T>(
+  late final Pref<T, P> _pref = Pref(
+    ref.watch(sharedPreferencesProvider),
+    _key,
+    _defaultValue,
+    mapFrom: _mapFrom,
+    mapTo: _mapTo,
+  );
+
+  static AutoDisposeNotifierProvider<PrefNotifier<T, P>, T> provider<T, P>(
     String key,
     T defaultValue, {
-    T Function(String value)? mapFrom,
-    String Function(T value)? mapTo,
+    T Function(P value)? mapFrom,
+    P Function(T value)? mapTo,
   }) =>
       AutoDisposeNotifierProvider(
         () => PrefNotifier(key, defaultValue, mapFrom, mapTo),
       );
 
-  @override
-  SharedPreferences get prefs => ref.read(sharedPreferencesProvider);
-
-  @override
   Future<void> update(T value) async {
-    super.update(value);
+    _pref.update(value);
     super.state = value;
   }
 
   @override
-  T build() => getValue();
-}
-
-class AlwaysAlivePrefNotifier<T> extends Notifier<T>
-    with _Prefs<T>, InfraLogger {
-  AlwaysAlivePrefNotifier(
-    this.key,
-    this.defaultValue,
-    this.mapFrom,
-    this.mapTo,
-  );
-
-  @override
-  final String key;
-  @override
-  final T defaultValue;
-  @override
-  final T Function(String)? mapFrom;
-  @override
-  final String Function(T)? mapTo;
-
-  static NotifierProvider<AlwaysAlivePrefNotifier<T>, T> provider<T>(
-    String key,
-    T defaultValue, {
-    T Function(String value)? mapFrom,
-    String Function(T value)? mapTo,
-  }) =>
-      NotifierProvider(
-        () => AlwaysAlivePrefNotifier(key, defaultValue, mapFrom, mapTo),
-      );
-
-  @override
-  SharedPreferences get prefs => ref.read(sharedPreferencesProvider);
-
-  @override
-  Future<void> update(T value) async {
-    super.update(value);
-    super.state = value;
-  }
-
-  @override
-  T build() => getValue();
-}
-
-mixin _Prefs<T> implements LoggerMixin {
-  String get key;
-  T get defaultValue;
-  T Function(String)? get mapFrom;
-  String Function(T)? get mapTo;
-
-  SharedPreferences get prefs;
-
-  /// Updates the value asynchronously.
-  Future<void> update(T value) async {
-    loggy.debug("updating preference [$key] to [$value]");
-    try {
-      if (mapTo != null && mapFrom != null) {
-        await prefs.setString(key, mapTo!(value));
-      } else {
-        switch (value) {
-          case String _:
-            await prefs.setString(key, value);
-          case bool _:
-            await prefs.setBool(key, value);
-          case int _:
-            await prefs.setInt(key, value);
-          case double _:
-            await prefs.setDouble(key, value);
-          case List<String> _:
-            await prefs.setStringList(key, value);
-        }
-      }
-    } catch (e) {
-      loggy.warning("error updating preference[$key]: $e");
-    }
-  }
-
-  T getValue() {
-    try {
-      loggy.debug("getting persisted preference [$key]");
-      if (mapTo != null && mapFrom != null) {
-        final persisted = prefs.getString(key);
-        return persisted != null ? mapFrom!(persisted) : defaultValue;
-      }
-      return prefs.get(key) as T? ?? defaultValue;
-    } catch (e) {
-      loggy.warning("error getting preference[$key]: $e");
-      return defaultValue;
-    }
-  }
+  T build() => _pref.getValue();
 }