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diff --git a/buteo-plugins/buteo-sync-plugin-fediverse-notifications/fediversenotificationssyncadaptor.h b/buteo-plugins/buteo-sync-plugin-fediverse-notifications/fediversenotificationssyncadaptor.h
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+++ b/buteo-plugins/buteo-sync-plugin-fediverse-notifications/fediversenotificationssyncadaptor.h
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+/****************************************************************************
+ **
+ ** Copyright (C) 2013-2026 Jolla Ltd.
+ **
+ ** This program/library is free software; you can redistribute it and/or
+ ** modify it under the terms of the GNU Lesser General Public License
+ ** version 2.1 as published by the Free Software Foundation.
+ **
+ ** This program/library is distributed in the hope that it will be useful,
+ ** but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ ** Lesser General Public License for more details.
+ **
+ ** You should have received a copy of the GNU Lesser General Public
+ ** License along with this program/library; if not, write to the Free
+ ** Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ ** 02110-1301 USA
+ **
+ ****************************************************************************/
+
+#ifndef FEDIVERSENOTIFICATIONSSYNCADAPTOR_H
+#define FEDIVERSENOTIFICATIONSSYNCADAPTOR_H
+
+#include "fediversedatatypesyncadaptor.h"
+
+#include <QtCore/QDateTime>
+#include <QtCore/QHash>
+#include <QtCore/QSet>
+#include <QtNetwork/QNetworkReply>
+
+class Notification;
+
+class FediverseNotificationsSyncAdaptor : public FediverseNotificationsDataTypeSyncAdaptor
+{
+    Q_OBJECT
+
+public:
+    FediverseNotificationsSyncAdaptor(QObject *parent);
+    ~FediverseNotificationsSyncAdaptor();
+
+    QString syncServiceName() const override;
+
+protected:
+    QString authServiceName() const override;
+    void purgeDataForOldAccount(int oldId, SocialNetworkSyncAdaptor::PurgeMode mode) override;
+    void beginSync(int accountId, const QString &accessToken) override;
+    void finalize(int accountId) override;
+
+private:
+    struct PendingNotification {
+        QString notificationId;
+        QString summary;
+        QString body;
+        QString link;
+        QDateTime timestamp;
+    };
+
+    struct PendingSyncState {
+        QString accessToken;
+        bool markerKnown = false;
+        QString unreadFloorId;
+        QString lastFetchedId;
+        QString maxFetchedId;
+        QSet<QString> unreadNotificationIds;
+        QHash<QString, PendingNotification> pendingNotifications;
+    };
+
+    static QString sanitizeContent(const QString &content);
+    static QDateTime parseTimestamp(const QString &timestampString);
+    static int compareNotificationIds(const QString &left, const QString &right);
+    QString loadLastFetchedId(int accountId) const;
+    void saveLastFetchedId(int accountId, const QString &lastFetchedId);
+
+    void requestUnreadMarker(int accountId, const QString &accessToken);
+    void requestNotifications(int accountId,
+                              const QString &accessToken,
+                              const QString &minId,
+                              const QString &maxId = QString());
+    void requestMarkRead(int accountId, const QString &accessToken, const QString &lastReadId);
+    void publishSystemNotification(int accountId, const PendingNotification &notificationData);
+    Notification *createNotification(int accountId, const QString &notificationId);
+    Notification *findNotification(int accountId, const QString &notificationId);
+    void closeAccountNotifications(int accountId, const QSet<QString> &keepNotificationIds = QSet<QString>());
+    static QString notificationObjectKey(int accountId, const QString &notificationId);
+    void maybeMarkAccountNotificationsRead(int accountId,
+                                           const QString &accessToken,
+                                           Notification *ignoredNotification = 0);
+    void markReadFromNotification(Notification *notification);
+    void removeCachedNotification(Notification *notification);
+
+private Q_SLOTS:
+    void finishedUnreadMarkerHandler();
+    void finishedNotificationsHandler();
+    void finishedMarkReadHandler();
+    void notificationClosedWithReason(uint reason);
+
+private:
+    QHash<int, QString> m_accessTokens;
+    QHash<int, PendingSyncState> m_pendingSyncStates;
+    QHash<int, QString> m_lastMarkedReadIds;
+    QHash<QString, Notification *> m_notificationObjects;
+};
+
+#endif // FEDIVERSENOTIFICATIONSSYNCADAPTOR_H