diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63d85a3d..355751c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changelog
 
 ## 2.7.0
+- Added update channel options: `release` or `preview`.
 - Introduced immersive timetable wallpaper.
 - Introduced timetable palette generator from images.
 - Cropping the timetable wallpaper.
diff --git a/lib/backend/stats/entity/feature.dart b/lib/backend/stats/entity/feature.dart
index e5aefa12..51a92010 100644
--- a/lib/backend/stats/entity/feature.dart
+++ b/lib/backend/stats/entity/feature.dart
@@ -5,12 +5,14 @@ class StatsFeatureUsage {
   @Id()
   int id;
   final String feature;
+  final String result;
   @Property(type: PropertyType.date)
   final DateTime time;
 
   StatsFeatureUsage({
     this.id = 0,
     required this.feature,
+    this.result = "",
     required this.time,
   });
 }
diff --git a/lib/login/page/index.dart b/lib/login/page/index.dart
index 45f9e1a6..2b836b98 100644
--- a/lib/login/page/index.dart
+++ b/lib/login/page/index.dart
@@ -358,7 +358,7 @@ class _LoginPageState extends ConsumerState<LoginPage> {
                 icon: const Icon(Icons.login),
                 label: _i18n.login.text(),
               ),
-      if (!widget.isGuarded && ref.watch(CredentialsInit.storage.oa.$lastAuthTime) == null )
+      if (!widget.isGuarded && ref.watch(CredentialsInit.storage.oa.$lastAuthTime) == null)
         $account >>
             (ctx, account) =>
                 $password >>
diff --git a/lib/objectbox-model.json b/lib/objectbox-model.json
index dc65a0de..59ebbf71 100644
--- a/lib/objectbox-model.json
+++ b/lib/objectbox-model.json
@@ -4,47 +4,52 @@
   "_note3": "If you have VCS merge conflicts, you must resolve them according to ObjectBox docs.",
   "entities": [
     {
-      "id": "1:3049504742638355443",
-      "lastPropertyId": "3:6829777567001922062",
+      "id": "1:6058686906110423483",
+      "lastPropertyId": "4:1456794932391410454",
       "name": "StatsFeatureUsage",
       "properties": [
         {
-          "id": "1:7339886906527342418",
+          "id": "1:8567821803968552595",
           "name": "id",
           "type": 6,
           "flags": 1
         },
         {
-          "id": "2:3550306696746963752",
-          "name": "time",
-          "type": 10
+          "id": "2:6258818122600997136",
+          "name": "feature",
+          "type": 9
         },
         {
-          "id": "3:6829777567001922062",
-          "name": "feature",
+          "id": "3:3615904521094794642",
+          "name": "result",
           "type": 9
+        },
+        {
+          "id": "4:1456794932391410454",
+          "name": "time",
+          "type": 10
         }
       ],
       "relations": []
     },
     {
-      "id": "2:2808936172102568470",
-      "lastPropertyId": "3:4450762094026544792",
+      "id": "2:6860077869163213812",
+      "lastPropertyId": "3:6558364299568351246",
       "name": "StatsRoute",
       "properties": [
         {
-          "id": "1:2242334635534013885",
+          "id": "1:1088320578842355463",
           "name": "id",
           "type": 6,
           "flags": 1
         },
         {
-          "id": "2:5995258184475796813",
+          "id": "2:6229011439275914211",
           "name": "route",
           "type": 9
         },
         {
-          "id": "3:4450762094026544792",
+          "id": "3:6558364299568351246",
           "name": "time",
           "type": 10
         }
@@ -52,7 +57,7 @@
       "relations": []
     }
   ],
-  "lastEntityId": "2:2808936172102568470",
+  "lastEntityId": "2:6860077869163213812",
   "lastIndexId": "0:0",
   "lastRelationId": "0:0",
   "lastSequenceId": "0:0",
diff --git a/lib/objectbox.g.dart b/lib/objectbox.g.dart
index 4a1e1b0b..939efb9e 100644
--- a/lib/objectbox.g.dart
+++ b/lib/objectbox.g.dart
@@ -20,26 +20,27 @@ export 'package:objectbox/objectbox.dart'; // so that callers only have to impor
 
 final _entities = <obx_int.ModelEntity>[
   obx_int.ModelEntity(
-      id: const obx_int.IdUid(1, 3049504742638355443),
+      id: const obx_int.IdUid(1, 6058686906110423483),
       name: 'StatsFeatureUsage',
-      lastPropertyId: const obx_int.IdUid(3, 6829777567001922062),
+      lastPropertyId: const obx_int.IdUid(4, 1456794932391410454),
       flags: 0,
       properties: <obx_int.ModelProperty>[
-        obx_int.ModelProperty(id: const obx_int.IdUid(1, 7339886906527342418), name: 'id', type: 6, flags: 1),
-        obx_int.ModelProperty(id: const obx_int.IdUid(2, 3550306696746963752), name: 'time', type: 10, flags: 0),
-        obx_int.ModelProperty(id: const obx_int.IdUid(3, 6829777567001922062), name: 'feature', type: 9, flags: 0)
+        obx_int.ModelProperty(id: const obx_int.IdUid(1, 8567821803968552595), name: 'id', type: 6, flags: 1),
+        obx_int.ModelProperty(id: const obx_int.IdUid(2, 6258818122600997136), name: 'feature', type: 9, flags: 0),
+        obx_int.ModelProperty(id: const obx_int.IdUid(3, 3615904521094794642), name: 'result', type: 9, flags: 0),
+        obx_int.ModelProperty(id: const obx_int.IdUid(4, 1456794932391410454), name: 'time', type: 10, flags: 0)
       ],
       relations: <obx_int.ModelRelation>[],
       backlinks: <obx_int.ModelBacklink>[]),
   obx_int.ModelEntity(
-      id: const obx_int.IdUid(2, 2808936172102568470),
+      id: const obx_int.IdUid(2, 6860077869163213812),
       name: 'StatsRoute',
-      lastPropertyId: const obx_int.IdUid(3, 4450762094026544792),
+      lastPropertyId: const obx_int.IdUid(3, 6558364299568351246),
       flags: 0,
       properties: <obx_int.ModelProperty>[
-        obx_int.ModelProperty(id: const obx_int.IdUid(1, 2242334635534013885), name: 'id', type: 6, flags: 1),
-        obx_int.ModelProperty(id: const obx_int.IdUid(2, 5995258184475796813), name: 'route', type: 9, flags: 0),
-        obx_int.ModelProperty(id: const obx_int.IdUid(3, 4450762094026544792), name: 'time', type: 10, flags: 0)
+        obx_int.ModelProperty(id: const obx_int.IdUid(1, 1088320578842355463), name: 'id', type: 6, flags: 1),
+        obx_int.ModelProperty(id: const obx_int.IdUid(2, 6229011439275914211), name: 'route', type: 9, flags: 0),
+        obx_int.ModelProperty(id: const obx_int.IdUid(3, 6558364299568351246), name: 'time', type: 10, flags: 0)
       ],
       relations: <obx_int.ModelRelation>[],
       backlinks: <obx_int.ModelBacklink>[])
@@ -80,7 +81,7 @@ Future<obx.Store> openStore(
 obx_int.ModelDefinition getObjectBoxModel() {
   final model = obx_int.ModelInfo(
       entities: _entities,
-      lastEntityId: const obx_int.IdUid(2, 2808936172102568470),
+      lastEntityId: const obx_int.IdUid(2, 6860077869163213812),
       lastIndexId: const obx_int.IdUid(0, 0),
       lastRelationId: const obx_int.IdUid(0, 0),
       lastSequenceId: const obx_int.IdUid(0, 0),
@@ -103,10 +104,12 @@ obx_int.ModelDefinition getObjectBoxModel() {
         },
         objectToFB: (StatsFeatureUsage object, fb.Builder fbb) {
           final featureOffset = fbb.writeString(object.feature);
-          fbb.startTable(4);
+          final resultOffset = fbb.writeString(object.result);
+          fbb.startTable(5);
           fbb.addInt64(0, object.id);
-          fbb.addInt64(1, object.time.millisecondsSinceEpoch);
-          fbb.addOffset(2, featureOffset);
+          fbb.addOffset(1, featureOffset);
+          fbb.addOffset(2, resultOffset);
+          fbb.addInt64(3, object.time.millisecondsSinceEpoch);
           fbb.finish(fbb.endTable());
           return object.id;
         },
@@ -114,10 +117,11 @@ obx_int.ModelDefinition getObjectBoxModel() {
           final buffer = fb.BufferContext(fbData);
           final rootOffset = buffer.derefObject(0);
           final idParam = const fb.Int64Reader().vTableGet(buffer, rootOffset, 4, 0);
-          final featureParam = const fb.StringReader(asciiOptimization: true).vTableGet(buffer, rootOffset, 8, '');
+          final featureParam = const fb.StringReader(asciiOptimization: true).vTableGet(buffer, rootOffset, 6, '');
+          final resultParam = const fb.StringReader(asciiOptimization: true).vTableGet(buffer, rootOffset, 8, '');
           final timeParam =
-              DateTime.fromMillisecondsSinceEpoch(const fb.Int64Reader().vTableGet(buffer, rootOffset, 6, 0));
-          final object = StatsFeatureUsage(id: idParam, feature: featureParam, time: timeParam);
+              DateTime.fromMillisecondsSinceEpoch(const fb.Int64Reader().vTableGet(buffer, rootOffset, 10, 0));
+          final object = StatsFeatureUsage(id: idParam, feature: featureParam, result: resultParam, time: timeParam);
 
           return object;
         }),
@@ -159,11 +163,14 @@ class StatsFeatureUsage_ {
   /// See [StatsFeatureUsage.id].
   static final id = obx.QueryIntegerProperty<StatsFeatureUsage>(_entities[0].properties[0]);
 
-  /// See [StatsFeatureUsage.time].
-  static final time = obx.QueryDateProperty<StatsFeatureUsage>(_entities[0].properties[1]);
-
   /// See [StatsFeatureUsage.feature].
-  static final feature = obx.QueryStringProperty<StatsFeatureUsage>(_entities[0].properties[2]);
+  static final feature = obx.QueryStringProperty<StatsFeatureUsage>(_entities[0].properties[1]);
+
+  /// See [StatsFeatureUsage.result].
+  static final result = obx.QueryStringProperty<StatsFeatureUsage>(_entities[0].properties[2]);
+
+  /// See [StatsFeatureUsage.time].
+  static final time = obx.QueryDateProperty<StatsFeatureUsage>(_entities[0].properties[3]);
 }
 
 /// [StatsRoute] entity fields to define ObjectBox queries.
diff --git a/lib/school/oa_announce/page/list.dart b/lib/school/oa_announce/page/list.dart
index 9bb7497d..75515591 100644
--- a/lib/school/oa_announce/page/list.dart
+++ b/lib/school/oa_announce/page/list.dart
@@ -130,14 +130,14 @@ class _OaAnnounceLoadingListState extends State<OaAnnounceLoadingList> with Auto
             desc: i18n.noOaAnnouncementsTip,
           )
         : ListView.builder(
-          itemCount: announcements.length,
-          itemBuilder: (ctx, index) {
-            return Card.filled(
-              clipBehavior: Clip.hardEdge,
-              child: OaAnnounceTile(announcements[index]),
-            );
-          },
-        );
+            itemCount: announcements.length,
+            itemBuilder: (ctx, index) {
+              return Card.filled(
+                clipBehavior: Clip.hardEdge,
+                child: OaAnnounceTile(announcements[index]),
+              );
+            },
+          );
   }
 
   Future<void> loadMore() async {
diff --git a/lib/settings/page/proxy.dart b/lib/settings/page/proxy.dart
index 50b5beb9..1c9e725d 100644
--- a/lib/settings/page/proxy.dart
+++ b/lib/settings/page/proxy.dart
@@ -548,7 +548,7 @@ class _EnableProxyToggleTile extends ConsumerWidget {
       title: i18n.proxy.enableProxy.text(),
       subtitle: i18n.proxy.enableProxyDesc.text(),
       value: enabled,
-      onChanged: tileEnabled? onChanged : null,
+      onChanged: tileEnabled ? onChanged : null,
     );
   }
 }
diff --git a/lib/timetable/widget/timetable/weekly.dart b/lib/timetable/widget/timetable/weekly.dart
index dc88c6b5..13912e0d 100644
--- a/lib/timetable/widget/timetable/weekly.dart
+++ b/lib/timetable/widget/timetable/weekly.dart
@@ -193,9 +193,9 @@ class TimetableOneWeek extends StatelessWidget {
   final Size fullSize;
   final bool showFreeTip;
   final Widget Function({
-  required BuildContext context,
-  required TimetableLessonPart lesson,
-  required TimetableEntity timetable,
+    required BuildContext context,
+    required TimetableLessonPart lesson,
+    required TimetableEntity timetable,
   }) cellBuilder;
 
   const TimetableOneWeek({
@@ -236,7 +236,11 @@ class TimetableOneWeek extends StatelessWidget {
   }
 
   /// timeslots
-  Widget buildLeftColumn(BuildContext context, Size cellSize, {required int month,}) {
+  Widget buildLeftColumn(
+    BuildContext context,
+    Size cellSize, {
+    required int month,
+  }) {
     final textStyle = context.textTheme.bodyMedium;
     final cells = <Widget>[];
     cells.add(Container(
@@ -264,7 +268,8 @@ class TimetableOneWeek extends StatelessWidget {
     return cells.column();
   }
 
-  Widget buildSingleWeekView(TimetableWeek timetableWeek, {
+  Widget buildSingleWeekView(
+    TimetableWeek timetableWeek, {
     required BuildContext context,
     required TimetableEntity timetable,
     required Size cellSize,
@@ -273,11 +278,12 @@ class TimetableOneWeek extends StatelessWidget {
   }) {
     return List.generate(8, (index) {
       if (index == 0) {
-        return buildLeftColumn(context, cellSize, month:reflectWeekDayIndexToDate(
-          weekIndex: weekIndex,
-          weekday: Weekday.monday,
-          startDate: timetable.startDate,
-        ).month);
+        return buildLeftColumn(context, cellSize,
+            month: reflectWeekDayIndexToDate(
+              weekIndex: weekIndex,
+              weekday: Weekday.monday,
+              startDate: timetable.startDate,
+            ).month);
       } else {
         return _buildCellsByDay(
           context,
@@ -290,11 +296,12 @@ class TimetableOneWeek extends StatelessWidget {
   }
 
   /// lessons on a day
-  Widget _buildCellsByDay(BuildContext context,
-      TimetableDay day,
-      Size cellSize, {
-        required TimetablePos todayPos,
-      }) {
+  Widget _buildCellsByDay(
+    BuildContext context,
+    TimetableDay day,
+    Size cellSize, {
+    required TimetablePos todayPos,
+  }) {
     final cells = <Widget>[];
     cells.add(DashLined(
       color: getTimetableHeaderDashLinedColor(context),
@@ -380,21 +387,19 @@ class InteractiveCourseCell extends ConsumerWidget {
       course: course,
       isLessonTaken: isLessonTaken,
       style: style,
-      innerBuilder: (ctx, child) =>
-          InkWell(
-            onTap: () async {
-              if (!context.mounted) return;
-              await context.showSheet(
-                    (ctx) =>
-                    TimetableCourseSheetPage(
-                      courseCode: course.courseCode,
-                      timetable: timetable,
-                      highlightedCourseKey: course.courseKey,
-                    ),
-              );
-            },
-            child: child,
-          ),
+      innerBuilder: (ctx, child) => InkWell(
+        onTap: () async {
+          if (!context.mounted) return;
+          await context.showSheet(
+            (ctx) => TimetableCourseSheetPage(
+              courseCode: course.courseCode,
+              timetable: timetable,
+              highlightedCourseKey: course.courseKey,
+            ),
+          );
+        },
+        child: child,
+      ),
     );
   }
 }
@@ -427,37 +432,35 @@ class _InteractiveCourseCellWithTooltipState extends State<InteractiveCourseCell
       course: widget.lesson.course,
       isLessonTaken: widget.isLessonTaken,
       style: widget.style,
-      innerBuilder: (ctx, child) =>
-          Tooltip(
-            key: $tooltip,
-            preferBelow: false,
-            triggerMode: UniversalPlatform.isDesktop ? TooltipTriggerMode.tap : TooltipTriggerMode.manual,
-            message: buildTooltipMessage(),
-            textAlign: TextAlign.center,
-            child: InkWell(
-              onTap: UniversalPlatform.isDesktop
-                  ? null
-                  : () async {
-                $tooltip.currentState?.ensureTooltipVisible();
-                await HapticFeedback.selectionClick();
-              },
-              // onDoubleTap: showDetailsSheet,
-              onLongPress: showDetailsSheet,
-              child: child,
-            ),
-          ),
+      innerBuilder: (ctx, child) => Tooltip(
+        key: $tooltip,
+        preferBelow: false,
+        triggerMode: UniversalPlatform.isDesktop ? TooltipTriggerMode.tap : TooltipTriggerMode.manual,
+        message: buildTooltipMessage(),
+        textAlign: TextAlign.center,
+        child: InkWell(
+          onTap: UniversalPlatform.isDesktop
+              ? null
+              : () async {
+                  $tooltip.currentState?.ensureTooltipVisible();
+                  await HapticFeedback.selectionClick();
+                },
+          // onDoubleTap: showDetailsSheet,
+          onLongPress: showDetailsSheet,
+          child: child,
+        ),
+      ),
     );
   }
 
   Future<void> showDetailsSheet() async {
     final course = widget.lesson.course;
     await context.showSheet(
-          (ctx) =>
-          TimetableCourseSheetPage(
-            courseCode: course.courseCode,
-            timetable: widget.timetable,
-            highlightedCourseKey: course.courseKey,
-          ),
+      (ctx) => TimetableCourseSheetPage(
+        courseCode: course.courseCode,
+        timetable: widget.timetable,
+        highlightedCourseKey: course.courseKey,
+      ),
     );
   }
 
diff --git a/lib/utils/images.dart b/lib/utils/images.dart
index 83653f94..9751cbe1 100644
--- a/lib/utils/images.dart
+++ b/lib/utils/images.dart
@@ -6,8 +6,8 @@ import 'package:image_cropper/image_cropper.dart';
 import 'package:universal_platform/universal_platform.dart';
 import 'package:path/path.dart' as path;
 
-bool isGif(File imageFile){
-  return  path.extension(imageFile.path).toLowerCase() == ".gif";
+bool isGif(File imageFile) {
+  return path.extension(imageFile.path).toLowerCase() == ".gif";
 }
 
 Future<void> copyCompressedImageToTarget({