diff --git a/CMakeLists.txt b/CMakeLists.txt
index 824071a34..30c75a2a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,7 @@ cmake_minimum_required(VERSION 3.9.0)
 
 # Global variables describing the project.
 string(TIMESTAMP YEAR "%Y")
+string(TIMESTAMP DATE "%Y-%m-%d")
 
 set(APP_NAME "RSS Guard")
 set(APP_EMAIL "rotter.martinos@gmail.com")
@@ -65,7 +66,7 @@ set(APP_AUTHOR "Martin Rotter")
 set(APP_COPYRIGHT "\\251 2011-${YEAR} ${APP_AUTHOR}")
 set(APP_REVERSE_NAME "io.github.martinrotter.rssguard")
 set(APP_DONATE_URL "https://github.com/sponsors/martinrotter")
-set(APP_VERSION "4.2.7")
+set(APP_VERSION "4.3.0")
 
 set(APP_URL "https://github.com/martinrotter/rssguard")
 set(APP_URL_DOCUMENTATION "https://github.com/martinrotter/rssguard/blob/${APP_VERSION}/resources/docs/Documentation.md")
diff --git a/resources/desktop/rssguard.metainfo.xml.in b/resources/desktop/rssguard.metainfo.xml.in
index d135fa012..c4a115754 100644
--- a/resources/desktop/rssguard.metainfo.xml.in
+++ b/resources/desktop/rssguard.metainfo.xml.in
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Copyright 2017-2022 Martin Rotter <rotter.martinos@gmail.com> -->
+<!-- Copyright 2017-@YEAR@ Martin Rotter <rotter.martinos@gmail.com> -->
 <component type="desktop-application">
   <id>@APP_REVERSE_NAME@</id>
   <metadata_license>CC0-1.0</metadata_license>
@@ -60,7 +60,7 @@
   <content_rating type="oars-1.0" />
   <content_rating type="oars-1.1" />
   <releases>
-    <release version="4.2.7" date="2023-01-03" />
+    <release version="@APP_VERSION@" date="@DATE@" />
   </releases>
   <provides>
     <binary>@APP_LOW_NAME@</binary>
diff --git a/resources/scripts/github-actions/build-linux-mac.sh b/resources/scripts/github-actions/build-linux-mac.sh
index 341d44613..97e9dd7eb 100755
--- a/resources/scripts/github-actions/build-linux-mac.sh
+++ b/resources/scripts/github-actions/build-linux-mac.sh
@@ -51,7 +51,7 @@ else
   USE_QT6="ON"
 
   QTPATH="$(pwd)/Qt"
-  QTVERSION="6.4.1"
+  QTVERSION="6.4.2"
   QTBIN="$QTPATH/$QTVERSION/$QTOS/bin"
 
   pip3 install aqtinstall
diff --git a/resources/scripts/github-actions/build-windows.ps1 b/resources/scripts/github-actions/build-windows.ps1
index f202c5b8b..2c2a79446 100755
--- a/resources/scripts/github-actions/build-windows.ps1
+++ b/resources/scripts/github-actions/build-windows.ps1
@@ -20,12 +20,11 @@ $AllProtocols = [System.Net.SecurityProtocolType]'Tls11,Tls12'
 $ProgressPreference = 'SilentlyContinue'
 
 # Get and prepare needed dependencies.
-
 if ($use_qt5 -eq "ON") {
   $qt_version = "5.15.2"
 }
 else {
-  $qt_version = "6.3.2"
+  $qt_version = "6.4.2"
 }
 
 $maria_version = "10.6.11"
diff --git a/resources/scripts/hooks/pre-commit b/resources/scripts/hooks/pre-commit
deleted file mode 100755
index 255964435..000000000
--- a/resources/scripts/hooks/pre-commit
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/sh
-
-changelog_file="resources/text/CHANGELOG"
-datestring="$(date +%F)"
-versionstring="$(head -n 1 "$changelog_file")"
-
-for appdata_file in resources/desktop/*.metainfo.xml.in; do
-  appdata_file_n="${appdata_file}.n"
-
-  # Set version and date.
-  cat "$appdata_file" | sed -e "s@release version\=\"[A-Za-z0-9.]*\"@release version\=\"$versionstring\"@g" | sed -e "s@ date\=\"[0-9\-]*\"@ date\=\"$datestring\"@g" > "$appdata_file_n"
-  mv "$appdata_file_n" "$appdata_file"
-
-  git add "$appdata_file"
-done
-
-exit 0
\ No newline at end of file
diff --git a/src/librssguard/core/feeddownloader.cpp b/src/librssguard/core/feeddownloader.cpp
index 0e1913fa4..e35bc52c0 100644
--- a/src/librssguard/core/feeddownloader.cpp
+++ b/src/librssguard/core/feeddownloader.cpp
@@ -16,20 +16,32 @@
 
 #include <QDebug>
 #include <QJSEngine>
-#include <QMutexLocker>
 #include <QString>
 #include <QThread>
+#include <QtConcurrentMap>
 
 FeedDownloader::FeedDownloader()
-  : QObject(), m_isCacheSynchronizationRunning(false), m_stopCacheSynchronization(false), m_mutex(new QMutex()),
-    m_feedsUpdated(0), m_feedsOriginalCount(0) {
+  : QObject(), m_isCacheSynchronizationRunning(false), m_stopCacheSynchronization(false) {
   qRegisterMetaType<FeedDownloadResults>("FeedDownloadResults");
+
+  connect(&m_watcherLookup, &QFutureWatcher<FeedUpdateResult>::resultReadyAt, this, [=](int idx) {
+    FeedUpdateResult res = m_watcherLookup.resultAt(idx);
+
+    emit updateProgress(res.feed, m_watcherLookup.progressValue(), m_watcherLookup.progressMaximum());
+  });
+
+  /*
+connect(&m_watcherLookup, &QFutureWatcher<FeedUpdateResult>::progressValueChanged, this, [=](int prog) {
+//
+});
+*/
+
+  connect(&m_watcherLookup, &QFutureWatcher<FeedUpdateResult>::finished, this, [=]() {
+    finalizeUpdate();
+  });
 }
 
 FeedDownloader::~FeedDownloader() {
-  m_mutex->tryLock();
-  m_mutex->unlock();
-  delete m_mutex;
   qDebugNN << LOGSEC_FEEDDOWNLOADER << "Destroying FeedDownloader instance.";
 }
 
@@ -62,36 +74,22 @@ void FeedDownloader::synchronizeAccountCaches(const QList<CacheForServiceRoot*>&
 }
 
 void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
-  QMutexLocker locker(m_mutex);
-
+  m_erroredAccounts.clear();
   m_results.clear();
-  m_feeds = feeds;
-  m_feedsOriginalCount = m_feeds.size();
-  m_feedsUpdated = 0;
-
-  const QDateTime update_time = QDateTime::currentDateTimeUtc();
+  m_feeds.clear();
 
   if (feeds.isEmpty()) {
     qDebugNN << LOGSEC_FEEDDOWNLOADER << "No feeds to update in worker thread, aborting update.";
   }
   else {
-    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Starting feed updates from worker in thread: '" << QThread::currentThreadId()
-             << "'.";
+    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Starting feed updates from worker in thread"
+             << QUOTE_W_SPACE_DOT(QThread::currentThreadId());
 
     // Job starts now.
     emit updateStarted();
     QSet<CacheForServiceRoot*> caches;
     QMultiHash<ServiceRoot*, Feed*> feeds_per_root;
 
-    // 1. key - account.
-    // 2. key - feed custom ID.
-    // 3. key - msg state.
-    QHash<ServiceRoot*, QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>>> stated_messages;
-
-    // 1. key - account.
-    // 2. key - label custom ID.
-    QHash<ServiceRoot*, QHash<QString, QStringList>> tagged_messages;
-
     for (auto* fd : feeds) {
       CacheForServiceRoot* fd_cache = fd->getParentServiceRoot()->toCache();
 
@@ -104,24 +102,21 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
 
     synchronizeAccountCaches(caches.values(), false);
 
-    QHash<ServiceRoot*, ApplicationException> errored_roots;
     auto roots = feeds_per_root.uniqueKeys();
-    bool is_main_thread = QThread::currentThread() == qApp->thread();
-    QSqlDatabase database = is_main_thread ? qApp->database()->driver()->connection(metaObject()->className())
-                                           : qApp->database()->driver()->connection(QSL("feed_upd"));
+    QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
     for (auto* rt : roots) {
+      auto fds = feeds_per_root.values(rt);
+      QHash<QString, QStringList> per_acc_tags;
+      QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>> per_acc_states;
+
       // Obtain lists of local IDs.
       if (rt->wantsBaggedIdsOfExistingMessages()) {
-        // Tagged messages for the account.
-        tagged_messages.insert(rt, DatabaseQueries::bagsOfMessages(database, rt->labelsNode()->labels()));
-
-        QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>> per_acc_states;
+        // Tags per account.
+        per_acc_tags = DatabaseQueries::bagsOfMessages(database, rt->labelsNode()->labels());
 
         // This account has activated intelligent downloading of messages.
         // Prepare bags.
-        auto fds = feeds_per_root.values(rt);
-
         for (Feed* fd : fds) {
           QHash<ServiceRoot::BagOfMessages, QStringList> per_feed_states;
 
@@ -131,40 +126,66 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
                                  DatabaseQueries::bagOfMessages(database, ServiceRoot::BagOfMessages::Unread, fd));
           per_feed_states.insert(ServiceRoot::BagOfMessages::Starred,
                                  DatabaseQueries::bagOfMessages(database, ServiceRoot::BagOfMessages::Starred, fd));
-          per_acc_states.insert(fd->customId(), per_feed_states);
-        }
 
-        stated_messages.insert(rt, per_acc_states);
+          per_acc_states.insert(fd->customId(), per_feed_states);
+
+          FeedUpdateRequest fu;
+
+          fu.account = rt;
+          fu.feed = fd;
+          fu.stated_messages = per_feed_states;
+          fu.tagged_messages = per_acc_tags;
+
+          m_feeds.append(fu);
+        }
+      }
+      else {
+        for (Feed* fd : fds) {
+          FeedUpdateRequest fu;
+
+          fu.account = rt;
+          fu.feed = fd;
+
+          m_feeds.append(fu);
+        }
       }
 
       try {
-        rt->aboutToBeginFeedFetching(feeds_per_root.values(rt), stated_messages.value(rt), tagged_messages.value(rt));
+        rt->aboutToBeginFeedFetching(fds, per_acc_states, per_acc_tags);
       }
       catch (const ApplicationException& ex) {
         // Common error showed, all feeds from the root are errored now!
-        errored_roots.insert(rt, ex);
+        m_erroredAccounts.insert(rt, ex);
       }
     }
 
-    while (!m_feeds.isEmpty()) {
-      auto n_f = m_feeds.takeFirst();
-      auto n_r = n_f->getParentServiceRoot();
+    std::function<FeedUpdateResult(const FeedUpdateRequest&)> func =
+      [=](const FeedUpdateRequest& fd) -> FeedUpdateResult {
+      return updateThreadedFeed(fd);
+    };
 
-      if (errored_roots.contains(n_r)) {
-        // This feed is errored because its account errored when preparing feed update.
-        ApplicationException root_ex = errored_roots.value(n_r);
+    m_watcherLookup.setFuture(QtConcurrent::mapped(m_feeds, func));
+  }
+}
 
-        skipFeedUpdateWithError(n_r, n_f, root_ex);
-      }
-      else {
-        updateOneFeed(n_r, n_f, stated_messages.value(n_r).value(n_f->customId()), tagged_messages.value(n_r));
-      }
+FeedUpdateResult FeedDownloader::updateThreadedFeed(const FeedUpdateRequest& fd) {
+  if (m_erroredAccounts.contains(fd.account)) {
+    // This feed is errored because its account errored when preparing feed update.
+    ApplicationException root_ex = m_erroredAccounts.value(fd.account);
 
-      n_f->setLastUpdated(QDateTime::currentDateTimeUtc());
-    }
+    skipFeedUpdateWithError(fd.account, fd.feed, root_ex);
+  }
+  else {
+    updateOneFeed(fd.account, fd.feed, fd.stated_messages, fd.tagged_messages);
   }
 
-  finalizeUpdate();
+  fd.feed->setLastUpdated(QDateTime::currentDateTimeUtc());
+
+  FeedUpdateResult res;
+
+  res.feed = fd.feed;
+
+  return res;
 }
 
 void FeedDownloader::skipFeedUpdateWithError(ServiceRoot* acc, Feed* feed, const ApplicationException& ex) {
@@ -176,38 +197,38 @@ void FeedDownloader::skipFeedUpdateWithError(ServiceRoot* acc, Feed* feed, const
   else {
     feed->setStatus(Feed::Status::OtherError, ex.message());
   }
-
-  acc->itemChanged({feed});
-
-  emit updateProgress(feed, ++m_feedsUpdated, m_feedsOriginalCount);
 }
 
 void FeedDownloader::stopRunningUpdate() {
   m_stopCacheSynchronization = true;
+
+  m_watcherLookup.cancel();
+  m_watcherLookup.waitForFinished();
+
   m_feeds.clear();
-  m_feedsOriginalCount = m_feedsUpdated = 0;
 }
 
 void FeedDownloader::updateOneFeed(ServiceRoot* acc,
                                    Feed* feed,
                                    const QHash<ServiceRoot::BagOfMessages, QStringList>& stated_messages,
                                    const QHash<QString, QStringList>& tagged_messages) {
-  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Downloading new messages for feed ID '" << feed->customId() << "' URL: '"
-           << feed->source() << "' title: '" << feed->title() << "' in thread: '" << QThread::currentThreadId() << "'.";
+  qlonglong thread_id = qlonglong(QThread::currentThreadId());
 
-  int acc_id = feed->getParentServiceRoot()->accountId();
+  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Downloading new messages for feed ID" << QUOTE_W_SPACE(feed->customId())
+           << "URL:" << QUOTE_W_SPACE(feed->source()) << "title:" << QUOTE_W_SPACE(feed->title()) << "in thread "
+           << QUOTE_W_SPACE_DOT(thread_id);
+
+  int acc_id = acc->accountId();
   QElapsedTimer tmr;
   tmr.start();
 
   try {
-    bool is_main_thread = QThread::currentThread() == qApp->thread();
-    QSqlDatabase database = is_main_thread ? qApp->database()->driver()->connection(metaObject()->className())
-                                           : qApp->database()->driver()->connection(QSL("feed_upd"));
+    QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
     QList<Message> msgs = feed->getParentServiceRoot()->obtainNewMessages(feed, stated_messages, tagged_messages);
 
-    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Downloaded " << msgs.size() << " messages for feed ID '" << feed->customId()
-             << "' URL: '" << feed->source() << "' title: '" << feed->title() << "' in thread: '"
-             << QThread::currentThreadId() << "'. Operation took " << tmr.nsecsElapsed() / 1000 << " microseconds.";
+    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Downloaded" << NONQUOTE_W_SPACE(msgs.size()) << "messages for feed ID"
+             << QUOTE_W_SPACE_COMMA(feed->customId()) << "operation took" << NONQUOTE_W_SPACE(tmr.nsecsElapsed() / 1000)
+             << "microseconds.";
 
     bool fix_future_datetimes =
       qApp->settings()->value(GROUP(Messages), SETTING(Messages::FixupFutureArticleDateTimes)).toBool();
@@ -296,15 +317,15 @@ void FeedDownloader::updateOneFeed(ServiceRoot* acc,
         }
 
         if (!msg_original.m_isRead && msg_tweaked_by_filter->m_isRead) {
-          qDebugNN << LOGSEC_FEEDDOWNLOADER << "Message with custom ID: '" << msg_original.m_customId
-                   << "' was marked as read by message scripts.";
+          qDebugNN << LOGSEC_FEEDDOWNLOADER << "Message with custom ID:" << QUOTE_W_SPACE(msg_original.m_customId)
+                   << "was marked as read by message scripts.";
 
           read_msgs << *msg_tweaked_by_filter;
         }
 
         if (!msg_original.m_isImportant && msg_tweaked_by_filter->m_isImportant) {
-          qDebugNN << LOGSEC_FEEDDOWNLOADER << "Message with custom ID: '" << msg_original.m_customId
-                   << "' was marked as important by message scripts.";
+          qDebugNN << LOGSEC_FEEDDOWNLOADER << "Message with custom ID:" << QUOTE_W_SPACE(msg_original.m_customId)
+                   << "was marked as important by message scripts.";
 
           important_msgs << *msg_tweaked_by_filter;
         }
@@ -312,6 +333,8 @@ void FeedDownloader::updateOneFeed(ServiceRoot* acc,
         // Process changed labels.
         for (Label* lbl : qAsConst(msg_original.m_assignedLabels)) {
           if (!msg_tweaked_by_filter->m_assignedLabels.contains(lbl)) {
+            QMutexLocker lck(&m_mutexDb);
+
             // Label is not there anymore, it was deassigned.
             lbl->deassignFromMessage(*msg_tweaked_by_filter);
 
@@ -323,6 +346,8 @@ void FeedDownloader::updateOneFeed(ServiceRoot* acc,
 
         for (Label* lbl : qAsConst(msg_tweaked_by_filter->m_assignedLabels)) {
           if (!msg_original.m_assignedLabels.contains(lbl)) {
+            QMutexLocker lck(&m_mutexDb);
+
             // Label is in new message, but is not in old message, it
             // was newly assigned.
             lbl->assignToMessage(*msg_tweaked_by_filter);
@@ -371,16 +396,11 @@ void FeedDownloader::updateOneFeed(ServiceRoot* acc,
 
     removeDuplicateMessages(msgs);
 
-    // Now make sure, that messages are actually stored to SQL in a locked state.
-    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Saving messages of feed ID '" << feed->customId() << "' URL: '"
-             << feed->source() << "' title: '" << feed->title() << "' in thread: '" << QThread::currentThreadId()
-             << "'.";
-
     tmr.restart();
-    auto updated_messages = acc->updateMessages(msgs, feed, false);
+    auto updated_messages = acc->updateMessages(msgs, feed, false, &m_mutexDb);
 
-    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Updating messages in DB took " << tmr.nsecsElapsed() / 1000
-             << " microseconds.";
+    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Updating messages in DB took" << NONQUOTE_W_SPACE(tmr.nsecsElapsed() / 1000)
+             << "microseconds.";
 
     if (feed->status() != Feed::Status::NewMessages) {
       feed->setStatus(updated_messages.first > 0 || updated_messages.second > 0 ? Feed::Status::NewMessages
@@ -407,18 +427,16 @@ void FeedDownloader::updateOneFeed(ServiceRoot* acc,
     feed->setStatus(Feed::Status::OtherError, app_ex.message());
   }
 
-  feed->getParentServiceRoot()->itemChanged({feed});
-
-  m_feedsUpdated++;
-
-  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Made progress in feed updates, total feeds count " << m_feedsUpdated << "/"
-           << m_feedsOriginalCount << " (id of feed is " << feed->id() << ").";
-  emit updateProgress(feed, m_feedsUpdated, m_feedsOriginalCount);
+  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Made progress in feed updates, total feeds count "
+           << m_watcherLookup.progressValue() + 1 << "/" << m_feeds.size() << " (id of feed is " << feed->id() << ").";
 }
 
 void FeedDownloader::finalizeUpdate() {
-  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Finished feed updates in thread: '" << QThread::currentThreadId() << "'.";
+  qDebugNN << LOGSEC_FEEDDOWNLOADER << "Finished feed updates in thread"
+           << QUOTE_W_SPACE_DOT(QThread::currentThreadId());
+
   m_results.sort();
+  m_feeds.clear();
 
   // Update of feeds has finished.
   // NOTE: This means that now "update lock" can be unlocked
diff --git a/src/librssguard/core/feeddownloader.h b/src/librssguard/core/feeddownloader.h
index 600e8291e..09e29fd5e 100644
--- a/src/librssguard/core/feeddownloader.h
+++ b/src/librssguard/core/feeddownloader.h
@@ -5,6 +5,7 @@
 
 #include <QObject>
 
+#include <QFutureWatcher>
 #include <QPair>
 
 #include "core/message.h"
@@ -13,7 +14,6 @@
 #include "services/abstract/feed.h"
 
 class MessageFilter;
-class QMutex;
 
 // Represents results of batch feed updates.
 class FeedDownloadResults {
@@ -30,6 +30,17 @@ class FeedDownloadResults {
     QList<QPair<Feed*, int>> m_updatedFeeds;
 };
 
+struct FeedUpdateRequest {
+    Feed* feed = nullptr;
+    ServiceRoot* account = nullptr;
+    QHash<ServiceRoot::BagOfMessages, QStringList> stated_messages;
+    QHash<QString, QStringList> tagged_messages;
+};
+
+struct FeedUpdateResult {
+    Feed* feed = nullptr;
+};
+
 // This class offers means to "update" feeds and "special" categories.
 // NOTE: This class is used within separate thread.
 class FeedDownloader : public QObject {
@@ -62,14 +73,16 @@ class FeedDownloader : public QObject {
     void finalizeUpdate();
     void removeDuplicateMessages(QList<Message>& messages);
 
+    FeedUpdateResult updateThreadedFeed(const FeedUpdateRequest& fd);
+
   private:
     bool m_isCacheSynchronizationRunning;
     bool m_stopCacheSynchronization;
-    QList<Feed*> m_feeds = {};
-    QMutex* m_mutex;
+    QMutex m_mutexDb;
+    QHash<ServiceRoot*, ApplicationException> m_erroredAccounts;
+    QList<FeedUpdateRequest> m_feeds = {};
+    QFutureWatcher<FeedUpdateResult> m_watcherLookup;
     FeedDownloadResults m_results;
-    int m_feedsUpdated;
-    int m_feedsOriginalCount;
 };
 
 #endif // FEEDDOWNLOADER_H
diff --git a/src/librssguard/database/databasecleaner.cpp b/src/librssguard/database/databasecleaner.cpp
index 6265a6d25..db32291ae 100644
--- a/src/librssguard/database/databasecleaner.cpp
+++ b/src/librssguard/database/databasecleaner.cpp
@@ -11,7 +11,7 @@
 DatabaseCleaner::DatabaseCleaner(QObject* parent) : QObject(parent) {}
 
 void DatabaseCleaner::purgeDatabaseData(CleanerOrders which_data) {
-  qDebugNN << LOGSEC_DB << "Performing database cleanup in thread: '" << QThread::currentThreadId() << "'.";
+  qDebugNN << LOGSEC_DB << "Performing database cleanup in thread:" << QUOTE_W_SPACE_DOT(QThread::currentThreadId());
 
   // Inform everyone about the start of the process.
   emit purgeStarted();
diff --git a/src/librssguard/database/databasedriver.cpp b/src/librssguard/database/databasedriver.cpp
index 7c893e22f..6003efabf 100644
--- a/src/librssguard/database/databasedriver.cpp
+++ b/src/librssguard/database/databasedriver.cpp
@@ -10,9 +10,20 @@
 #include <QRegularExpression>
 #include <QSqlError>
 #include <QSqlQuery>
+#include <QThread>
 
 DatabaseDriver::DatabaseDriver(QObject* parent) : QObject(parent) {}
 
+QSqlDatabase DatabaseDriver::threadSafeConnection(const QString& connection_name, DesiredStorageType desired_type) {
+  qlonglong thread_id = qlonglong(QThread::currentThreadId());
+  bool is_main_thread = QThread::currentThread() == qApp->thread();
+
+  QSqlDatabase database =
+    connection(is_main_thread ? connection_name : QSL("db_connection_%1").arg(thread_id), desired_type);
+
+  return database;
+}
+
 void DatabaseDriver::updateDatabaseSchema(QSqlQuery& query,
                                           int source_db_schema_version,
                                           const QString& database_name) {
diff --git a/src/librssguard/database/databasedriver.h b/src/librssguard/database/databasedriver.h
index 257acbbd8..2c6ad8ba1 100644
--- a/src/librssguard/database/databasedriver.h
+++ b/src/librssguard/database/databasedriver.h
@@ -9,25 +9,21 @@
 #include <QSqlQuery>
 
 class DatabaseDriver : public QObject {
-  Q_OBJECT
+    Q_OBJECT
 
   public:
-
     // Describes available types of database backend.
-    enum class DriverType {
-      SQLite,
-      MySQL
-    };
+    enum class DriverType { SQLite, MySQL };
 
     // Describes what type of database user wants.
-    enum class DesiredStorageType {
-      StrictlyFileBased,
-      StrictlyInMemory,
-      FromSettings
-    };
+    enum class DesiredStorageType { StrictlyFileBased, StrictlyInMemory, FromSettings };
 
     explicit DatabaseDriver(QObject* parent = nullptr);
 
+    QSqlDatabase threadSafeConnection(const QString& connection_name,
+                                      DatabaseDriver::DesiredStorageType desired_type =
+                                        DatabaseDriver::DesiredStorageType::FromSettings);
+
     // API.
     virtual QString location() const = 0;
     virtual QString humanDriverType() const = 0;
@@ -43,19 +39,17 @@ class DatabaseDriver : public QObject {
     virtual bool finishRestoration() = 0;
     virtual qint64 databaseDataSize() = 0;
     virtual QSqlDatabase connection(const QString& connection_name,
-                                    DatabaseDriver::DesiredStorageType desired_type = DatabaseDriver::DesiredStorageType::FromSettings) = 0;
+                                    DatabaseDriver::DesiredStorageType desired_type =
+                                      DatabaseDriver::DesiredStorageType::FromSettings) = 0;
 
   protected:
-    void updateDatabaseSchema(QSqlQuery& query,
-                              int source_db_schema_version,
-                              const QString& database_name = {});
+    void updateDatabaseSchema(QSqlQuery& query, int source_db_schema_version, const QString& database_name = {});
 
     void setSchemaVersion(QSqlQuery& query, int new_schema_version, bool empty_table);
 
     QStringList prepareScript(const QString& base_sql_folder,
                               const QString& sql_file,
                               const QString& database_name = {});
-
 };
 
 #endif // DATABASEDRIVER_H
diff --git a/src/librssguard/database/databasequeries.cpp b/src/librssguard/database/databasequeries.cpp
index 5de60aa49..727348604 100644
--- a/src/librssguard/database/databasequeries.cpp
+++ b/src/librssguard/database/databasequeries.cpp
@@ -1080,13 +1080,13 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
                                                 QList<Message>& messages,
                                                 Feed* feed,
                                                 bool force_update,
+                                                QMutex* db_mutex,
                                                 bool* ok) {
   if (messages.isEmpty()) {
     *ok = true;
     return {0, 0};
   }
 
-  bool use_transactions = qApp->settings()->value(GROUP(Database), SETTING(Database::UseTransactions)).toBool();
   QPair<int, int> updated_messages = {0, 0};
   int account_id = feed->getParentServiceRoot()->accountId();
   auto feed_custom_id = feed->customId();
@@ -1097,8 +1097,6 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
   QSqlQuery query_select_with_custom_id_for_feed(db);
   QSqlQuery query_select_with_id(db);
   QSqlQuery query_update(db);
-  QSqlQuery query_insert(db);
-  QSqlQuery query_begin_transaction(db);
 
   // Here we have query which will check for existence of the "same" message in given feed.
   // The two message are the "same" if:
@@ -1132,14 +1130,6 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
     .prepare(QSL("SELECT date_created, is_read, is_important, contents, feed, title, author FROM Messages "
                  "WHERE id = :id AND account_id = :account_id;"));
 
-  // Used to insert new messages.
-  query_insert.setForwardOnly(true);
-  query_insert.prepare(QSL("INSERT INTO Messages "
-                           "(feed, title, is_read, is_important, is_deleted, url, author, score, date_created, "
-                           "contents, enclosures, custom_id, custom_hash, account_id) "
-                           "VALUES (:feed, :title, :is_read, :is_important, :is_deleted, :url, :author, :score, "
-                           ":date_created, :contents, :enclosures, :custom_id, :custom_hash, :account_id);"));
-
   // Used to update existing messages.
   query_update.setForwardOnly(true);
   query_update.prepare(QSL("UPDATE Messages "
@@ -1148,12 +1138,6 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
                            "contents = :contents, enclosures = :enclosures, feed = :feed "
                            "WHERE id = :id;"));
 
-  if (use_transactions && !db.transaction()) {
-    qCriticalNN << LOGSEC_DB << "Transaction start for message downloader failed:"
-                << QUOTE_W_SPACE_DOT(query_begin_transaction.lastError().text());
-    return updated_messages;
-  }
-
   QVector<Message*> msgs_to_insert;
 
   for (Message& message : messages) {
@@ -1166,6 +1150,8 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
     QString title_existing_message;
     QString author_existing_message;
 
+    QMutexLocker lck(db_mutex);
+
     if (message.m_id > 0) {
       // We recognize directly existing message.
       // NOTE: Particularly for manual message filter execution.
@@ -1357,8 +1343,8 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
           updated_messages.second++;
         }
         else if (query_update.lastError().isValid()) {
-          qWarningNN << LOGSEC_DB
-                     << "Failed to update message in DB:" << QUOTE_W_SPACE_DOT(query_update.lastError().text());
+          qCriticalNN << LOGSEC_DB
+                      << "Failed to update message in DB:" << QUOTE_W_SPACE_DOT(query_update.lastError().text());
         }
 
         query_update.finish();
@@ -1415,7 +1401,7 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
                       .replace(QSL(":date_created"), QString::number(msg->m_created.toMSecsSinceEpoch()))
                       .replace(QSL(":contents"), DatabaseFactory::escapeQuery(unnulifyString(msg->m_contents)))
                       .replace(QSL(":enclosures"), Enclosures::encodeEnclosuresToString(msg->m_enclosures))
-                      .replace(QSL(":custom_id"), unnulifyString(msg->m_customId))
+                      .replace(QSL(":custom_id"), DatabaseFactory::escapeQuery(unnulifyString(msg->m_customId)))
                       .replace(QSL(":custom_hash"), unnulifyString(msg->m_customHash))
                       .replace(QSL(":score"), QString::number(msg->m_score))
                       .replace(QSL(":account_id"), QString::number(account_id)));
@@ -1423,6 +1409,9 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
 
       if (!vals.isEmpty()) {
         QString final_bulk = bulk_insert.arg(vals.join(QSL(", ")));
+
+        QMutexLocker lck(db_mutex);
+
         auto bulk_query = db.exec(final_bulk);
         auto bulk_error = bulk_query.lastError();
 
@@ -1454,39 +1443,30 @@ QPair<int, int> DatabaseQueries::updateMessages(QSqlDatabase db,
   for (Message& message : messages) {
     if (!message.m_assignedLabels.isEmpty()) {
       if (!message.m_customId.isEmpty() || message.m_id > 0) {
+        QMutexLocker lck(db_mutex);
         setLabelsForMessage(db, message.m_assignedLabels, message);
       }
       else {
-        qWarningNN << LOGSEC_DB << "Cannot set labels for message" << QUOTE_W_SPACE(message.m_title)
-                   << "because we don't have ID or custom ID.";
+        qCriticalNN << LOGSEC_DB << "Cannot set labels for message" << QUOTE_W_SPACE(message.m_title)
+                    << "because we don't have ID or custom ID.";
       }
     }
   }
 
   // Now, fixup custom IDS for messages which initially did not have them,
   // just to keep the data consistent.
+  QMutexLocker lck(db_mutex);
+
   if (db.exec("UPDATE Messages "
               "SET custom_id = id "
               "WHERE custom_id IS NULL OR custom_id = '';")
         .lastError()
         .isValid()) {
-    qWarningNN << LOGSEC_DB << "Failed to set custom ID for all messages:" << QUOTE_W_SPACE_DOT(db.lastError().text());
+    qCriticalNN << LOGSEC_DB << "Failed to set custom ID for all messages:" << QUOTE_W_SPACE_DOT(db.lastError().text());
   }
 
-  if (use_transactions && !db.commit()) {
-    qCriticalNN << LOGSEC_DB
-                << "Transaction commit for message downloader failed:" << QUOTE_W_SPACE_DOT(db.lastError().text());
-    db.rollback();
-
-    if (ok != nullptr) {
-      *ok = false;
-      updated_messages = {0, 0};
-    }
-  }
-  else {
-    if (ok != nullptr) {
-      *ok = true;
-    }
+  if (ok != nullptr) {
+    *ok = true;
   }
 
   return updated_messages;
diff --git a/src/librssguard/database/databasequeries.h b/src/librssguard/database/databasequeries.h
index 37913768d..28d7d4197 100644
--- a/src/librssguard/database/databasequeries.h
+++ b/src/librssguard/database/databasequeries.h
@@ -140,6 +140,7 @@ class DatabaseQueries {
                                           QList<Message>& messages,
                                           Feed* feed,
                                           bool force_update,
+                                          QMutex* db_mutex,
                                           bool* ok = nullptr);
     static bool deleteAccount(const QSqlDatabase& db, ServiceRoot* account);
     static bool deleteAccountData(const QSqlDatabase& db,
diff --git a/src/librssguard/definitions/definitions.h b/src/librssguard/definitions/definitions.h
index dec825cfd..59660aedf 100644
--- a/src/librssguard/definitions/definitions.h
+++ b/src/librssguard/definitions/definitions.h
@@ -317,7 +317,7 @@
 #define OS_ID "OpenBSD"
 #elif defined(Q_OS_OS2)
 #define OS_ID "OS2"
-#elif defined(Q_OS_OSX)
+#elif defined(Q_OS_MACOS)
 #define OS_ID "macOS"
 #elif defined(Q_OS_WIN)
 #define OS_ID "Windows"
diff --git a/src/librssguard/gui/dialogs/formmain.cpp b/src/librssguard/gui/dialogs/formmain.cpp
index c0c0f669d..d563af6a0 100644
--- a/src/librssguard/gui/dialogs/formmain.cpp
+++ b/src/librssguard/gui/dialogs/formmain.cpp
@@ -267,6 +267,13 @@ void FormMain::prepareMenus() {
   if (QSysInfo::currentCpuArchitecture().contains(QSL("arm"), Qt::CaseSensitivity::CaseInsensitive)) {
     qWarningNN << LOGSEC_GUI << "Disabling native menu bar.";
     m_ui->m_menuBar->setNativeMenuBar(false);
+
+#if defined(Q_OS_MACOS)
+    // This works around a macOS-only Qt crash.
+    // QTBUG: https://bugreports.qt.io/browse/QTBUG-102107
+    // TODO: Remove this workaround once the upstream bug gets addressed.
+    m_ui->m_menuBar->setCornerWidget(nullptr);
+#endif
   }
 }
 
diff --git a/src/librssguard/gui/dialogs/formmessagefiltersmanager.cpp b/src/librssguard/gui/dialogs/formmessagefiltersmanager.cpp
index 14f34a198..2f2ab3ddb 100644
--- a/src/librssguard/gui/dialogs/formmessagefiltersmanager.cpp
+++ b/src/librssguard/gui/dialogs/formmessagefiltersmanager.cpp
@@ -448,7 +448,7 @@ void FormMessageFiltersManager::processCheckedFeeds() {
       }
 
       // Update messages in DB and reload selection.
-      it->getParentServiceRoot()->updateMessages(msgs, it->toFeed(), true);
+      it->getParentServiceRoot()->updateMessages(msgs, it->toFeed(), true, nullptr);
       displayMessagesOfFeed();
     }
   }
diff --git a/src/librssguard/gui/settings/settingsdatabase.cpp b/src/librssguard/gui/settings/settingsdatabase.cpp
index 1b2cacc92..6eb310251 100644
--- a/src/librssguard/gui/settings/settingsdatabase.cpp
+++ b/src/librssguard/gui/settings/settingsdatabase.cpp
@@ -12,54 +12,70 @@ SettingsDatabase::SettingsDatabase(Settings* settings, QWidget* parent)
   : SettingsPanel(settings, parent), m_ui(new Ui::SettingsDatabase) {
   m_ui->setupUi(this);
 
-  m_ui->m_lblDataStorageWarning->setHelpText(tr("Note that switching to another data storage type will "
-                                                "NOT copy existing your data from currently active data "
-                                                "storage to newly selected one."),
-                                             true);
-
   m_ui->m_lblMysqlInfo->setHelpText(tr("Note that speed of used MySQL server and latency of used connection "
                                        "medium HEAVILY influences the final performance of this application. "
                                        "Using slow database connections leads to bad performance when browsing "
                                        "feeds or messages."),
                                     false);
 
-  m_ui->m_lblSqliteInMemoryWarnings->setHelpText(tr("Usage of in-memory working database has several advantages "
-                                                    "and pitfalls. Make sure that you are familiar with these "
-                                                    "before you turn this feature on.\n"
-                                                    "\n"
-                                                    "Advantages:\n"
-                                                    " • higher speed for feed/message manipulations "
-                                                    "(especially with thousands of messages displayed),\n"
-                                                    " • whole database stored in RAM, thus your hard drive can "
-                                                    "rest more.\n"
-                                                    "\n"
-                                                    "Disadvantages:\n"
-                                                    " • if application crashes, your changes from last session are lost,\n"
-                                                    " • application startup and shutdown can take little longer "
-                                                    "(max. 2 seconds).\n"
-                                                    "\n"
-                                                    "Authors of this application are NOT responsible for lost data."),
-                                                 true);
+  m_ui->m_lblSqliteInMemoryWarnings
+    ->setHelpText(tr("Usage of in-memory working database has several advantages "
+                     "and pitfalls. Make sure that you are familiar with these "
+                     "before you turn this feature on.\n"
+                     "\n"
+                     "Advantages:\n"
+                     " • higher speed for feed/message manipulations "
+                     "(especially with thousands of messages displayed),\n"
+                     " • whole database stored in RAM, thus your hard drive can "
+                     "rest more.\n"
+                     "\n"
+                     "Disadvantages:\n"
+                     " • if application crashes, your changes from last session are lost,\n"
+                     " • application startup and shutdown can take little longer "
+                     "(max. 2 seconds).\n"
+                     "\n"
+                     "Authors of this application are NOT responsible for lost data."),
+                  true);
 
   m_ui->m_txtMysqlPassword->lineEdit()->setPasswordMode(true);
 
-  connect(m_ui->m_cmbDatabaseDriver, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this,
+  connect(m_ui->m_cmbDatabaseDriver,
+          static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+          this,
           &SettingsDatabase::dirtifySettings);
   connect(m_ui->m_checkSqliteUseInMemoryDatabase, &QCheckBox::toggled, this, &SettingsDatabase::dirtifySettings);
   connect(m_ui->m_txtMysqlDatabase->lineEdit(), &QLineEdit::textChanged, this, &SettingsDatabase::dirtifySettings);
   connect(m_ui->m_txtMysqlHostname->lineEdit(), &QLineEdit::textChanged, this, &SettingsDatabase::dirtifySettings);
   connect(m_ui->m_txtMysqlPassword->lineEdit(), &QLineEdit::textChanged, this, &SettingsDatabase::dirtifySettings);
-  connect(m_ui->m_checkUseTransactions, &QCheckBox::toggled, this, &SettingsDatabase::dirtifySettings);
   connect(m_ui->m_txtMysqlUsername->lineEdit(), &QLineEdit::textChanged, this, &SettingsDatabase::dirtifySettings);
-  connect(m_ui->m_spinMysqlPort, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &SettingsDatabase::dirtifySettings);
-  connect(m_ui->m_cmbDatabaseDriver, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this,
+  connect(m_ui->m_spinMysqlPort,
+          static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
+          this,
+          &SettingsDatabase::dirtifySettings);
+  connect(m_ui->m_cmbDatabaseDriver,
+          static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+          this,
           &SettingsDatabase::selectSqlBackend);
-  connect(m_ui->m_txtMysqlUsername->lineEdit(), &BaseLineEdit::textChanged, this, &SettingsDatabase::onMysqlUsernameChanged);
-  connect(m_ui->m_txtMysqlHostname->lineEdit(), &BaseLineEdit::textChanged, this, &SettingsDatabase::onMysqlHostnameChanged);
-  connect(m_ui->m_txtMysqlPassword->lineEdit(), &BaseLineEdit::textChanged, this, &SettingsDatabase::onMysqlPasswordChanged);
-  connect(m_ui->m_txtMysqlDatabase->lineEdit(), &BaseLineEdit::textChanged, this, &SettingsDatabase::onMysqlDatabaseChanged);
+  connect(m_ui->m_txtMysqlUsername->lineEdit(),
+          &BaseLineEdit::textChanged,
+          this,
+          &SettingsDatabase::onMysqlUsernameChanged);
+  connect(m_ui->m_txtMysqlHostname->lineEdit(),
+          &BaseLineEdit::textChanged,
+          this,
+          &SettingsDatabase::onMysqlHostnameChanged);
+  connect(m_ui->m_txtMysqlPassword->lineEdit(),
+          &BaseLineEdit::textChanged,
+          this,
+          &SettingsDatabase::onMysqlPasswordChanged);
+  connect(m_ui->m_txtMysqlDatabase->lineEdit(),
+          &BaseLineEdit::textChanged,
+          this,
+          &SettingsDatabase::onMysqlDatabaseChanged);
   connect(m_ui->m_btnMysqlTestSetup, &QPushButton::clicked, this, &SettingsDatabase::mysqlTestConnection);
-  connect(m_ui->m_cmbDatabaseDriver, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this,
+  connect(m_ui->m_cmbDatabaseDriver,
+          static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+          this,
           &SettingsDatabase::requireRestart);
   connect(m_ui->m_checkSqliteUseInMemoryDatabase, &QCheckBox::toggled, this, &SettingsDatabase::requireRestart);
   connect(m_ui->m_spinMysqlPort, &QSpinBox::editingFinished, this, &SettingsDatabase::requireRestart);
@@ -139,17 +155,14 @@ void SettingsDatabase::selectSqlBackend(int index) {
     m_ui->m_stackedDatabaseDriver->setCurrentIndex(1);
   }
   else {
-    qWarningNN << LOGSEC_GUI
-               << "GUI for given database driver '"
-               << selected_db_driver
-               << "' is not available.";
+    qWarningNN << LOGSEC_GUI << "GUI for given database driver '" << selected_db_driver << "' is not available.";
   }
 }
 
 void SettingsDatabase::loadSettings() {
   onBeginLoadSettings();
-  m_ui->m_checkUseTransactions->setChecked(qApp->settings()->value(GROUP(Database), SETTING(Database::UseTransactions)).toBool());
-  m_ui->m_lblMysqlTestResult->setStatus(WidgetWithStatus::StatusType::Information, tr("No connection test triggered so far."),
+  m_ui->m_lblMysqlTestResult->setStatus(WidgetWithStatus::StatusType::Information,
+                                        tr("No connection test triggered so far."),
                                         tr("You did not executed any connection test yet."));
 
   // Load SQLite.
@@ -158,7 +171,8 @@ void SettingsDatabase::loadSettings() {
   m_ui->m_cmbDatabaseDriver->addItem(lite_driver->humanDriverType(), lite_driver->qtDriverCode());
 
   // Load in-memory database status.
-  m_ui->m_checkSqliteUseInMemoryDatabase->setChecked(settings()->value(GROUP(Database), SETTING(Database::UseInMemory)).toBool());
+  m_ui->m_checkSqliteUseInMemoryDatabase
+    ->setChecked(settings()->value(GROUP(Database), SETTING(Database::UseInMemory)).toBool());
 
   auto* mysq_driver = qApp->database()->driverForType(DatabaseDriver::DriverType::MySQL);
 
@@ -176,16 +190,19 @@ void SettingsDatabase::loadSettings() {
     m_ui->m_txtMysqlUsername->lineEdit()->setPlaceholderText(tr("Username to login with"));
     m_ui->m_txtMysqlPassword->lineEdit()->setPlaceholderText(tr("Password for your username"));
     m_ui->m_txtMysqlDatabase->lineEdit()->setPlaceholderText(tr("Working database which you have full access to."));
-    m_ui->m_txtMysqlHostname->lineEdit()->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLHostname)).toString());
-    m_ui->m_txtMysqlUsername->lineEdit()->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLUsername)).toString());
-    m_ui->m_txtMysqlPassword->lineEdit()->setText(settings()->password(GROUP(Database),
-                                                                       SETTING(Database::MySQLPassword)).toString());
-    m_ui->m_txtMysqlDatabase->lineEdit()->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLDatabase)).toString());
+    m_ui->m_txtMysqlHostname->lineEdit()
+      ->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLHostname)).toString());
+    m_ui->m_txtMysqlUsername->lineEdit()
+      ->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLUsername)).toString());
+    m_ui->m_txtMysqlPassword->lineEdit()
+      ->setText(settings()->password(GROUP(Database), SETTING(Database::MySQLPassword)).toString());
+    m_ui->m_txtMysqlDatabase->lineEdit()
+      ->setText(settings()->value(GROUP(Database), SETTING(Database::MySQLDatabase)).toString());
     m_ui->m_spinMysqlPort->setValue(settings()->value(GROUP(Database), SETTING(Database::MySQLPort)).toInt());
   }
 
-  int index_current_backend = m_ui->m_cmbDatabaseDriver->findData(settings()->value(GROUP(Database),
-                                                                                    SETTING(Database::ActiveDriver)).toString());
+  int index_current_backend =
+    m_ui->m_cmbDatabaseDriver->findData(settings()->value(GROUP(Database), SETTING(Database::ActiveDriver)).toString());
 
   if (index_current_backend >= 0) {
     m_ui->m_cmbDatabaseDriver->setCurrentIndex(index_current_backend);
@@ -201,11 +218,10 @@ void SettingsDatabase::saveSettings() {
   const bool original_inmemory = settings()->value(GROUP(Database), SETTING(Database::UseInMemory)).toBool();
   const bool new_inmemory = m_ui->m_checkSqliteUseInMemoryDatabase->isChecked();
 
-  qApp->settings()->setValue(GROUP(Database), Database::UseTransactions, m_ui->m_checkUseTransactions->isChecked());
-
   // Save data storage settings.
   QString original_db_driver = settings()->value(GROUP(Database), SETTING(Database::ActiveDriver)).toString();
-  QString selected_db_driver = m_ui->m_cmbDatabaseDriver->itemData(m_ui->m_cmbDatabaseDriver->currentIndex()).toString();
+  QString selected_db_driver =
+    m_ui->m_cmbDatabaseDriver->itemData(m_ui->m_cmbDatabaseDriver->currentIndex()).toString();
 
   // Save SQLite.
   settings()->setValue(GROUP(Database), Database::UseInMemory, new_inmemory);
diff --git a/src/librssguard/gui/settings/settingsdatabase.ui b/src/librssguard/gui/settings/settingsdatabase.ui
index 88bb21cad..f63f5e3a5 100644
--- a/src/librssguard/gui/settings/settingsdatabase.ui
+++ b/src/librssguard/gui/settings/settingsdatabase.ui
@@ -11,20 +11,7 @@
    </rect>
   </property>
   <layout class="QFormLayout" name="formLayout">
-   <item row="0" column="0" colspan="2">
-    <widget class="QCheckBox" name="m_checkUseTransactions">
-     <property name="toolTip">
-      <string>Note that turning this option ON will make saving of new messages FASTER, but it might rarely cause some issues with messages saving.</string>
-     </property>
-     <property name="text">
-      <string>Use DB transactions when storing downloaded messages</string>
-     </property>
-    </widget>
-   </item>
-   <item row="1" column="0" colspan="2">
-    <widget class="HelpSpoiler" name="m_lblDataStorageWarning" native="true"/>
-   </item>
-   <item row="2" column="0">
+   <item row="0" column="0">
     <widget class="QLabel" name="m_lblDatabaseDriver">
      <property name="text">
       <string>Database driver</string>
@@ -34,10 +21,10 @@
      </property>
     </widget>
    </item>
-   <item row="2" column="1">
+   <item row="0" column="1">
     <widget class="QComboBox" name="m_cmbDatabaseDriver"/>
    </item>
-   <item row="3" column="0" colspan="2">
+   <item row="1" column="0" colspan="2">
     <widget class="QStackedWidget" name="m_stackedDatabaseDriver">
      <property name="currentIndex">
       <number>0</number>
@@ -204,7 +191,7 @@
      </widget>
     </widget>
    </item>
-   <item row="4" column="0" colspan="2">
+   <item row="2" column="0" colspan="2">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
@@ -218,11 +205,6 @@
     </spacer>
    </item>
   </layout>
-  <zorder>m_lblDatabaseDriver</zorder>
-  <zorder>m_cmbDatabaseDriver</zorder>
-  <zorder>m_stackedDatabaseDriver</zorder>
-  <zorder>m_checkUseTransactions</zorder>
-  <zorder>m_lblDataStorageWarning</zorder>
  </widget>
  <customwidgets>
   <customwidget>
diff --git a/src/librssguard/miscellaneous/application.cpp b/src/librssguard/miscellaneous/application.cpp
index 951165d17..a7c0015e0 100644
--- a/src/librssguard/miscellaneous/application.cpp
+++ b/src/librssguard/miscellaneous/application.cpp
@@ -215,6 +215,12 @@ Application::Application(const QString& id, int& argc, char** argv, const QStrin
 
   QTimer::singleShot(1000, system(), &SystemFactory::checkForUpdatesOnStartup);
 
+  auto ideal_th_count = QThread::idealThreadCount();
+
+  if (ideal_th_count > 1) {
+    QThreadPool::globalInstance()->setMaxThreadCount((std::min)(128, 2 * ideal_th_count));
+  }
+
   qDebugNN << LOGSEC_CORE << "OpenSSL version:" << QUOTE_W_SPACE_DOT(QSslSocket::sslLibraryVersionString());
   qDebugNN << LOGSEC_CORE << "OpenSSL supported:" << QUOTE_W_SPACE_DOT(QSslSocket::supportsSsl());
   qDebugNN << LOGSEC_CORE << "Global thread pool has"
diff --git a/src/librssguard/miscellaneous/feedreader.cpp b/src/librssguard/miscellaneous/feedreader.cpp
index 0e7727ab4..1b63ed045 100644
--- a/src/librssguard/miscellaneous/feedreader.cpp
+++ b/src/librssguard/miscellaneous/feedreader.cpp
@@ -122,7 +122,7 @@ void FeedReader::initializeFeedDownloader() {
 
     connect(m_feedDownloaderThread, &QThread::finished, m_feedDownloaderThread, &QThread::deleteLater);
     connect(m_feedDownloaderThread, &QThread::finished, m_feedDownloader, &FeedDownloader::deleteLater);
-    connect(m_feedDownloader, &FeedDownloader::updateFinished, this, &FeedReader::feedUpdatesFinished);
+    connect(m_feedDownloader, &FeedDownloader::updateFinished, this, &FeedReader::onFeedUpdatesFinished);
     connect(m_feedDownloader, &FeedDownloader::updateProgress, this, &FeedReader::feedUpdatesProgress);
     connect(m_feedDownloader, &FeedDownloader::updateStarted, this, &FeedReader::feedUpdatesStarted);
     connect(m_feedDownloader, &FeedDownloader::updateFinished, qApp->feedUpdateLock(), &Mutex::unlock);
@@ -348,6 +348,13 @@ void FeedReader::executeNextAutoUpdate() {
   }
 }
 
+void FeedReader::onFeedUpdatesFinished(FeedDownloadResults updated_feeds) {
+  m_feedsModel->reloadWholeLayout();
+  m_feedsModel->notifyWithCounts();
+
+  emit feedUpdatesFinished(updated_feeds);
+}
+
 QList<MessageFilter*> FeedReader::messageFilters() const {
   return m_messageFilters;
 }
diff --git a/src/librssguard/miscellaneous/feedreader.h b/src/librssguard/miscellaneous/feedreader.h
index be32e0303..62c055429 100644
--- a/src/librssguard/miscellaneous/feedreader.h
+++ b/src/librssguard/miscellaneous/feedreader.h
@@ -72,6 +72,7 @@ class RSSGUARD_DLLSPEC FeedReader : public QObject {
 
   private slots:
     void executeNextAutoUpdate();
+    void onFeedUpdatesFinished(FeedDownloadResults updated_feeds);
 
   signals:
     void feedUpdatesStarted();
diff --git a/src/librssguard/miscellaneous/settings.cpp b/src/librssguard/miscellaneous/settings.cpp
index 9edb1e1e8..68431ac98 100644
--- a/src/librssguard/miscellaneous/settings.cpp
+++ b/src/librssguard/miscellaneous/settings.cpp
@@ -374,9 +374,6 @@ DVALUE(int) Proxy::PortDef = 80;
 // Database.
 DKEY Database::ID = "database";
 
-DKEY Database::UseTransactions = "use_transactions";
-DVALUE(bool) Database::UseTransactionsDef = false;
-
 DKEY Database::UseInMemory = "use_in_memory_db";
 DVALUE(bool) Database::UseInMemoryDef = false;
 
@@ -438,7 +435,8 @@ DVALUE(QStringList) Browser::ExternalToolsDef = QStringList();
 DKEY CategoriesExpandStates::ID = "categories_expand_states";
 
 Settings::Settings(const QString& file_name, Format format, SettingsProperties::SettingsType type, QObject* parent)
-  : QSettings(file_name, format, parent), m_initializationStatus(type) {
+  : QSettings(file_name, format, parent), m_lock(QReadWriteLock(QReadWriteLock::RecursionMode::Recursive)),
+    m_initializationStatus(type) {
   Messages::PreviewerFontStandardDef = QFont(QApplication::font().family(), 12).toString();
 }
 
diff --git a/src/librssguard/miscellaneous/settings.h b/src/librssguard/miscellaneous/settings.h
index cfbd56591..beacc018d 100644
--- a/src/librssguard/miscellaneous/settings.h
+++ b/src/librssguard/miscellaneous/settings.h
@@ -14,7 +14,9 @@
 #include <QColor>
 #include <QDateTime>
 #include <QNetworkProxy>
+#include <QReadWriteLock>
 #include <QStringList>
+#include <QWriteLocker>
 
 #define KEY extern const QString
 #define DKEY const QString
@@ -399,9 +401,6 @@ namespace Proxy {
 // Database.
 namespace Database {
   KEY ID;
-  KEY UseTransactions;
-
-  VALUE(bool) UseTransactionsDef;
 
   KEY UseInMemory;
 
@@ -518,12 +517,13 @@ class Settings : public QSettings {
     static SettingsProperties determineProperties();
 
   private:
-    // Constructor.
     explicit Settings(const QString& file_name,
                       Format format,
                       SettingsProperties::SettingsType type,
                       QObject* parent = nullptr);
 
+  private:
+    mutable QReadWriteLock m_lock;
     SettingsProperties::SettingsType m_initializationStatus;
 };
 
@@ -545,10 +545,12 @@ inline QVariant Settings::value(const QString& section, const QString& key, cons
 }
 
 inline void Settings::setValue(const QString& section, const QString& key, const QVariant& value) {
+  QWriteLocker lck(&m_lock);
   QSettings::setValue(QString(QSL("%1/%2")).arg(section, key), value);
 }
 
 inline void Settings::setValue(const QString& key, const QVariant& value) {
+  QWriteLocker lck(&m_lock);
   QSettings::setValue(key, value);
 }
 
@@ -557,6 +559,8 @@ inline bool Settings::contains(const QString& section, const QString& key) const
 }
 
 inline void Settings::remove(const QString& section, const QString& key) {
+  QWriteLocker lck(&m_lock);
+
   if (key.isEmpty()) {
     beginGroup(section);
     QSettings::remove({});
diff --git a/src/librssguard/network-web/cookiejar.cpp b/src/librssguard/network-web/cookiejar.cpp
index fcb412d48..ff8299d10 100644
--- a/src/librssguard/network-web/cookiejar.cpp
+++ b/src/librssguard/network-web/cookiejar.cpp
@@ -113,7 +113,6 @@ void CookieJar::saveCookies() {
     if (cookie.isSessionCookie()) {
       continue;
     }
-
     sett->setPassword(GROUP(Cookies),
                       QSL("%1-%2").arg(QString::number(i++), QString::fromUtf8(cookie.name())),
                       cookie.toRawForm(QNetworkCookie::RawForm::Full));
@@ -121,10 +120,12 @@ void CookieJar::saveCookies() {
 }
 
 QList<QNetworkCookie> CookieJar::cookiesForUrl(const QUrl& url) const {
+  QReadLocker l(&m_lock);
   return QNetworkCookieJar::cookiesForUrl(url);
 }
 
 bool CookieJar::setCookiesFromUrl(const QList<QNetworkCookie>& cookie_list, const QUrl& url) {
+  QWriteLocker l(&m_lock);
   return QNetworkCookieJar::setCookiesFromUrl(cookie_list, url);
 }
 
@@ -192,11 +193,13 @@ bool CookieJar::insertCookie(const QNetworkCookie& cookie) {
     return {};
   }
   else {
+    QWriteLocker l(&m_lock);
     return insertCookieInternal(cookie, false, true);
   }
 }
 
 bool CookieJar::deleteCookie(const QNetworkCookie& cookie) {
+  QWriteLocker l(&m_lock);
   return deleteCookieInternal(cookie, false);
 }
 
@@ -210,5 +213,12 @@ void CookieJar::updateSettings() {
 }
 
 bool CookieJar::updateCookie(const QNetworkCookie& cookie) {
+  QWriteLocker l(&m_lock);
   return updateCookieInternal(cookie, false);
 }
+
+/*
+bool CookieJar::validateCookie(const QNetworkCookie &cookie, const QUrl &url) const {
+  return QNetworkCookieJar::validateCookie(cookie, url);
+}
+*/
diff --git a/src/librssguard/network-web/cookiejar.h b/src/librssguard/network-web/cookiejar.h
index 6531c2ddc..69975262b 100644
--- a/src/librssguard/network-web/cookiejar.h
+++ b/src/librssguard/network-web/cookiejar.h
@@ -7,6 +7,8 @@
 
 #include "miscellaneous/autosaver.h"
 
+#include <QReadWriteLock>
+
 #if defined(USE_WEBENGINE)
 class QWebEngineCookieStore;
 #endif
@@ -20,6 +22,7 @@ class CookieJar : public QNetworkCookieJar {
     virtual bool insertCookie(const QNetworkCookie& cookie);
     virtual bool updateCookie(const QNetworkCookie& cookie);
     virtual bool deleteCookie(const QNetworkCookie& cookie);
+    // virtual bool validateCookie(const QNetworkCookie& cookie, const QUrl& url) const;
 
     void updateSettings();
 
@@ -40,6 +43,7 @@ class CookieJar : public QNetworkCookieJar {
     QWebEngineCookieStore* m_webEngineCookies;
 #endif
 
+    mutable QReadWriteLock m_lock{QReadWriteLock::RecursionMode::Recursive};
     bool m_ignoreAllCookies;
     AutoSaver m_saver;
 };
diff --git a/src/librssguard/services/abstract/feed.cpp b/src/librssguard/services/abstract/feed.cpp
index 882d74df7..56b062cc2 100644
--- a/src/librssguard/services/abstract/feed.cpp
+++ b/src/librssguard/services/abstract/feed.cpp
@@ -17,8 +17,6 @@
 #include "services/abstract/serviceroot.h"
 #include "services/abstract/unreadnode.h"
 
-#include <QThread>
-
 Feed::Feed(RootItem* parent)
   : RootItem(parent), m_source(QString()), m_status(Status::Normal), m_statusString(QString()),
     m_autoUpdateType(AutoUpdateType::DefaultAutoUpdate), m_autoUpdateInterval(DEFAULT_AUTO_UPDATE_INTERVAL),
@@ -196,9 +194,7 @@ void Feed::appendMessageFilter(MessageFilter* filter) {
 }
 
 void Feed::updateCounts(bool including_total_count) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ? qApp->database()->driver()->connection(metaObject()->className())
-                                         : qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
   int account_id = getParentServiceRoot()->accountId();
 
   if (including_total_count) {
diff --git a/src/librssguard/services/abstract/importantnode.cpp b/src/librssguard/services/abstract/importantnode.cpp
index bddb5d3a3..0c1a3d078 100644
--- a/src/librssguard/services/abstract/importantnode.cpp
+++ b/src/librssguard/services/abstract/importantnode.cpp
@@ -8,8 +8,6 @@
 #include "services/abstract/cacheforserviceroot.h"
 #include "services/abstract/serviceroot.h"
 
-#include <QThread>
-
 ImportantNode::ImportantNode(RootItem* parent_item) : RootItem(parent_item) {
   setKind(RootItem::Kind::Important);
   setId(ID_IMPORTANT);
@@ -25,10 +23,7 @@ QList<Message> ImportantNode::undeletedMessages() const {
 }
 
 void ImportantNode::updateCounts(bool including_total_count) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
   int account_id = getParentServiceRoot()->accountId();
 
   if (including_total_count) {
diff --git a/src/librssguard/services/abstract/label.cpp b/src/librssguard/services/abstract/label.cpp
index 38d249409..cd83d52f1 100644
--- a/src/librssguard/services/abstract/label.cpp
+++ b/src/librssguard/services/abstract/label.cpp
@@ -2,17 +2,16 @@
 
 #include "services/abstract/label.h"
 
-#include "gui/dialogs/formaddeditlabel.h"
-#include "miscellaneous/application.h"
 #include "database/databasefactory.h"
 #include "database/databasequeries.h"
+#include "gui/dialogs/formaddeditlabel.h"
+#include "miscellaneous/application.h"
 #include "services/abstract/cacheforserviceroot.h"
 #include "services/abstract/labelsnode.h"
 #include "services/abstract/serviceroot.h"
 
 #include <QPainter>
 #include <QPainterPath>
-#include <QThread>
 
 Label::Label(const QString& name, const QColor& color, RootItem* parent_item) : Label(parent_item) {
   setColor(color);
@@ -76,10 +75,7 @@ bool Label::deleteViaGui() {
 }
 
 void Label::updateCounts(bool including_total_count) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
   int account_id = getParentServiceRoot()->accountId();
 
   if (including_total_count) {
@@ -110,28 +106,22 @@ QIcon Label::generateIcon(const QColor& color) {
 }
 
 void Label::assignToMessage(const Message& msg) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
-  if (getParentServiceRoot()->onBeforeLabelMessageAssignmentChanged({ this }, { msg }, true)) {
+  if (getParentServiceRoot()->onBeforeLabelMessageAssignmentChanged({this}, {msg}, true)) {
     DatabaseQueries::assignLabelToMessage(database, this, msg);
 
-    getParentServiceRoot()->onAfterLabelMessageAssignmentChanged({ this }, { msg }, true);
+    getParentServiceRoot()->onAfterLabelMessageAssignmentChanged({this}, {msg}, true);
   }
 }
 
 void Label::deassignFromMessage(const Message& msg) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
-  if (getParentServiceRoot()->onBeforeLabelMessageAssignmentChanged({ this }, { msg }, false)) {
+  if (getParentServiceRoot()->onBeforeLabelMessageAssignmentChanged({this}, {msg}, false)) {
     DatabaseQueries::deassignLabelFromMessage(database, this, msg);
 
-    getParentServiceRoot()->onAfterLabelMessageAssignmentChanged({ this }, { msg }, false);
+    getParentServiceRoot()->onAfterLabelMessageAssignmentChanged({this}, {msg}, false);
   }
 }
 
diff --git a/src/librssguard/services/abstract/recyclebin.cpp b/src/librssguard/services/abstract/recyclebin.cpp
index 90703f708..fdb822c41 100644
--- a/src/librssguard/services/abstract/recyclebin.cpp
+++ b/src/librssguard/services/abstract/recyclebin.cpp
@@ -9,10 +9,7 @@
 #include "services/abstract/cacheforserviceroot.h"
 #include "services/abstract/serviceroot.h"
 
-#include <QThread>
-
-RecycleBin::RecycleBin(RootItem* parent_item) : RootItem(parent_item), m_totalCount(0),
-  m_unreadCount(0) {
+RecycleBin::RecycleBin(RootItem* parent_item) : RootItem(parent_item), m_totalCount(0), m_unreadCount(0) {
   setKind(RootItem::Kind::Bin);
   setId(ID_RECYCLE_BIN);
   setIcon(qApp->icons()->fromTheme(QSL("user-trash")));
@@ -33,10 +30,7 @@ int RecycleBin::countOfAllMessages() const {
 }
 
 void RecycleBin::updateCounts(bool update_total_count) {
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
   m_unreadCount = DatabaseQueries::getMessageCountsForBin(database, getParentServiceRoot()->accountId(), false);
 
@@ -47,12 +41,9 @@ void RecycleBin::updateCounts(bool update_total_count) {
 
 QList<QAction*> RecycleBin::contextMenuFeedsList() {
   if (m_contextMenu.isEmpty()) {
-    QAction* restore_action = new QAction(qApp->icons()->fromTheme(QSL("view-refresh")),
-                                          tr("Restore recycle bin"),
-                                          this);
-    QAction* empty_action = new QAction(qApp->icons()->fromTheme(QSL("edit-clear")),
-                                        tr("Empty recycle bin"),
-                                        this);
+    QAction* restore_action =
+      new QAction(qApp->icons()->fromTheme(QSL("view-refresh")), tr("Restore recycle bin"), this);
+    QAction* empty_action = new QAction(qApp->icons()->fromTheme(QSL("edit-clear")), tr("Empty recycle bin"), this);
 
     connect(restore_action, &QAction::triggered, this, &RecycleBin::restore);
     connect(empty_action, &QAction::triggered, this, &RecycleBin::empty);
@@ -99,7 +90,8 @@ bool RecycleBin::cleanMessages(bool clear_only_read) {
     updateCounts(true);
     parent_root->itemChanged(QList<RootItem*>() << this);
     parent_root->requestReloadMessageList(true);
-    return true;;
+    return true;
+    ;
   }
   else {
     return false;
diff --git a/src/librssguard/services/abstract/serviceroot.cpp b/src/librssguard/services/abstract/serviceroot.cpp
index e9ab1d0bf..14929d1bd 100644
--- a/src/librssguard/services/abstract/serviceroot.cpp
+++ b/src/librssguard/services/abstract/serviceroot.cpp
@@ -19,8 +19,6 @@
 #include "services/abstract/recyclebin.h"
 #include "services/abstract/unreadnode.h"
 
-#include <QThread>
-
 ServiceRoot::ServiceRoot(RootItem* parent)
   : RootItem(parent), m_recycleBin(new RecycleBin(this)), m_importantNode(new ImportantNode(this)),
     m_labelsNode(new LabelsNode(this)), m_unreadNode(new UnreadNode(this)), m_accountId(NO_PARENT_CATEGORY),
@@ -945,7 +943,7 @@ ServiceRoot::LabelOperation operator&(ServiceRoot::LabelOperation lhs, ServiceRo
   return static_cast<ServiceRoot::LabelOperation>(static_cast<char>(lhs) & static_cast<char>(rhs));
 }
 
-QPair<int, int> ServiceRoot::updateMessages(QList<Message>& messages, Feed* feed, bool force_update) {
+QPair<int, int> ServiceRoot::updateMessages(QList<Message>& messages, Feed* feed, bool force_update, QMutex* db_mutex) {
   QPair<int, int> updated_messages = {0, 0};
 
   if (messages.isEmpty()) {
@@ -953,45 +951,37 @@ QPair<int, int> ServiceRoot::updateMessages(QList<Message>& messages, Feed* feed
     return updated_messages;
   }
 
-  QList<RootItem*> items_to_update;
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-
-  qDebugNN << LOGSEC_CORE << "Updating messages in DB. Main thread:" << QUOTE_W_SPACE_DOT(is_main_thread);
-
   bool ok = false;
-  QSqlDatabase database = is_main_thread ? qApp->database()->driver()->connection(metaObject()->className())
-                                         : qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
-  updated_messages = DatabaseQueries::updateMessages(database, messages, feed, force_update, &ok);
+  qDebugNN << LOGSEC_CORE << "Updating messages in DB.";
+
+  updated_messages = DatabaseQueries::updateMessages(database, messages, feed, force_update, db_mutex, &ok);
 
   if (updated_messages.first > 0 || updated_messages.second > 0) {
+    QMutexLocker lck(db_mutex);
+
     // Something was added or updated in the DB, update numbers.
     feed->updateCounts(true);
 
     if (recycleBin() != nullptr) {
       recycleBin()->updateCounts(true);
-      items_to_update.append(recycleBin());
     }
 
     if (importantNode() != nullptr) {
       importantNode()->updateCounts(true);
-      items_to_update.append(importantNode());
     }
 
     if (unreadNode() != nullptr) {
       unreadNode()->updateCounts(true);
-      items_to_update.append(unreadNode());
     }
 
     if (labelsNode() != nullptr) {
       labelsNode()->updateCounts(true);
-      items_to_update.append(labelsNode());
     }
   }
 
-  // Some messages were really added to DB, reload feed in model.
-  items_to_update.append(feed);
-  getParentServiceRoot()->itemChanged(items_to_update);
+  // NOTE: Do not update model items here. We update only once when all feeds are fetched.
 
   return updated_messages;
 }
diff --git a/src/librssguard/services/abstract/serviceroot.h b/src/librssguard/services/abstract/serviceroot.h
index 5ff7da93f..6845b606e 100644
--- a/src/librssguard/services/abstract/serviceroot.h
+++ b/src/librssguard/services/abstract/serviceroot.h
@@ -14,6 +14,7 @@
 #include <QPair>
 
 class QAction;
+class QMutex;
 class FeedsModel;
 class RecycleBin;
 class ImportantNode;
@@ -197,7 +198,7 @@ class ServiceRoot : public RootItem {
     void completelyRemoveAllData();
 
     // Returns counts of updated messages <unread, all>.
-    QPair<int, int> updateMessages(QList<Message>& messages, Feed* feed, bool force_update);
+    QPair<int, int> updateMessages(QList<Message>& messages, Feed* feed, bool force_update, QMutex* db_mutex);
 
     QIcon feedIconForMessage(const QString& feed_custom_id) const;
 
diff --git a/src/librssguard/services/abstract/unreadnode.cpp b/src/librssguard/services/abstract/unreadnode.cpp
index 92ec3616f..55d55785e 100644
--- a/src/librssguard/services/abstract/unreadnode.cpp
+++ b/src/librssguard/services/abstract/unreadnode.cpp
@@ -6,8 +6,6 @@
 #include "miscellaneous/application.h"
 #include "miscellaneous/iconfactory.h"
 
-#include <QThread>
-
 UnreadNode::UnreadNode(RootItem* parent_item) : RootItem(parent_item) {
   setKind(RootItem::Kind::Unread);
   setId(ID_UNREAD);
@@ -25,10 +23,7 @@ QList<Message> UnreadNode::undeletedMessages() const {
 void UnreadNode::updateCounts(bool including_total_count) {
   Q_UNUSED(including_total_count)
 
-  bool is_main_thread = QThread::currentThread() == qApp->thread();
-  QSqlDatabase database = is_main_thread ?
-                          qApp->database()->driver()->connection(metaObject()->className()) :
-                          qApp->database()->driver()->connection(QSL("feed_upd"));
+  QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
   int account_id = getParentServiceRoot()->accountId();
 
   m_totalCount = m_unreadCount = DatabaseQueries::getUnreadMessageCounts(database, account_id);
diff --git a/src/librssguard/services/gmail/gmailnetworkfactory.cpp b/src/librssguard/services/gmail/gmailnetworkfactory.cpp
index cc0229760..6e1a1ce61 100644
--- a/src/librssguard/services/gmail/gmailnetworkfactory.cpp
+++ b/src/librssguard/services/gmail/gmailnetworkfactory.cpp
@@ -23,7 +23,6 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QRegularExpression>
-#include <QThread>
 #include <QUrl>
 
 GmailNetworkFactory::GmailNetworkFactory(QObject* parent)
diff --git a/src/librssguard/services/reddit/redditnetworkfactory.cpp b/src/librssguard/services/reddit/redditnetworkfactory.cpp
index 1b3712e4d..4e37b4040 100644
--- a/src/librssguard/services/reddit/redditnetworkfactory.cpp
+++ b/src/librssguard/services/reddit/redditnetworkfactory.cpp
@@ -24,7 +24,6 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QRegularExpression>
-#include <QThread>
 #include <QUrl>
 
 RedditNetworkFactory::RedditNetworkFactory(QObject* parent)
diff --git a/src/librssguard/services/standard/gui/formstandardimportexport.cpp b/src/librssguard/services/standard/gui/formstandardimportexport.cpp
index cbc2018c4..4140afab4 100644
--- a/src/librssguard/services/standard/gui/formstandardimportexport.cpp
+++ b/src/librssguard/services/standard/gui/formstandardimportexport.cpp
@@ -248,7 +248,8 @@ void FormStandardImportExport::parseImportFile(const QString& file_name, bool fe
   QFile input_file(file_name);
   QByteArray input_data;
 
-  if (input_file.open(QIODevice::Text | QIODevice::Unbuffered | QIODevice::ReadOnly)) {
+  if (input_file.open(QIODevice::OpenModeFlag::Text | QIODevice::OpenModeFlag::Unbuffered |
+                      QIODevice::OpenModeFlag::ReadOnly)) {
     input_data = input_file.readAll();
     input_file.close();
   }
diff --git a/src/librssguard/services/standard/standardfeedsimportexportmodel.cpp b/src/librssguard/services/standard/standardfeedsimportexportmodel.cpp
index 69cfe0e86..5d9a9232d 100644
--- a/src/librssguard/services/standard/standardfeedsimportexportmodel.cpp
+++ b/src/librssguard/services/standard/standardfeedsimportexportmodel.cpp
@@ -36,7 +36,7 @@ FeedsImportExportModel::FeedsImportExportModel(QObject* parent)
 
     m_newRoot = nullptr;
 
-    emit parsingFinished(number_error, m_lookup.size() - number_error);
+    emit parsingFinished(number_error, res.size() - number_error);
 
     // Done, remove lookups.
     m_lookup.clear();
@@ -189,7 +189,7 @@ bool FeedsImportExportModel::produceFeed(const FeedLookup& feed_lookup) {
       new_feed->setPostProcessScript(feed_lookup.post_process_script);
     }
     else {
-      new_feed = new StandardFeed(feed_lookup.parent);
+      new_feed = new StandardFeed();
 
       if (feed_lookup.opml_element.isNull()) {
         new_feed->setSource(feed_lookup.url);