diff --git a/src/librssguard/core/message.cpp b/src/librssguard/core/message.cpp
index 109a4aad4..f58887ceb 100644
--- a/src/librssguard/core/message.cpp
+++ b/src/librssguard/core/message.cpp
@@ -192,6 +192,11 @@ bool MessageObject::isDuplicateWithAttribute(int attribute_check) const {
 
   QString full_query = QSL("SELECT COUNT(*) FROM Messages WHERE ") + where_clauses.join(QSL(" AND ")) + QSL(";");
 
+  qDebugNN << LOGSEC_MESSAGEMODEL
+           << "Query for MSG duplicate identification is: '"
+           << full_query
+           << "'.";
+
   q.setForwardOnly(true);
   q.prepare(full_query);
 
diff --git a/src/librssguard/definitions/definitions.h b/src/librssguard/definitions/definitions.h
index 216c8728e..01228854a 100755
--- a/src/librssguard/definitions/definitions.h
+++ b/src/librssguard/definitions/definitions.h
@@ -88,6 +88,7 @@
 #define LOGSEC_MESSAGEMODEL         "message-model: "
 #define LOGSEC_GUI                  "gui: "
 #define LOGSEC_CORE                 "core: "
+#define LOGSEC_DB                   "database: "
 
 #define MAX_ZOOM_FACTOR     5.0f
 #define MIN_ZOOM_FACTOR     0.25f
@@ -160,10 +161,6 @@
 #define qCriticalNN qCritical().noquote().nospace()
 #endif
 
-#ifndef qFatalNN
-#define qFatalNN qFatal().noquote().nospace()
-#endif
-
 #ifndef qInfoNN
 #define qInfoNN qInfo().noquote().nospace()
 #endif
diff --git a/src/librssguard/gui/basetoolbar.cpp b/src/librssguard/gui/basetoolbar.cpp
index 707ec71bd..8714b1f50 100644
--- a/src/librssguard/gui/basetoolbar.cpp
+++ b/src/librssguard/gui/basetoolbar.cpp
@@ -17,7 +17,7 @@ BaseToolBar::BaseToolBar(const QString& title, QWidget* parent) : QToolBar(title
 }
 
 BaseToolBar::~BaseToolBar() {
-  qDebug("Destroying BaseToolBar instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying BaseToolBar instance.";
 }
 
 void BaseBar::loadSavedActions() {
diff --git a/src/librssguard/gui/colorlabel.cpp b/src/librssguard/gui/colorlabel.cpp
deleted file mode 100644
index dc9c3ae77..000000000
--- a/src/librssguard/gui/colorlabel.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-// For license of this file, see <project-root-folder>/LICENSE.md.
-
-#include "gui/colorlabel.h"
-
-#include <QPainter>
-#include <QPaintEvent>
-
-ColorLabel::ColorLabel(QWidget* parent) : QLabel(parent) {
-  setFixedWidth(20);
-}
-
-QColor ColorLabel::color() const {
-  return m_color;
-}
-
-void ColorLabel::setColor(const QColor& color) {
-  m_color = color;
-  repaint();
-}
-
-void ColorLabel::paintEvent(QPaintEvent* event) {
-  QPainter(this).fillRect(event->rect(), m_color);
-}
diff --git a/src/librssguard/gui/colorlabel.h b/src/librssguard/gui/colorlabel.h
deleted file mode 100644
index 423d2c36d..000000000
--- a/src/librssguard/gui/colorlabel.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// For license of this file, see <project-root-folder>/LICENSE.md.
-
-#ifndef COLORLABEL_H
-#define COLORLABEL_H
-
-#include <QLabel>
-
-class ColorLabel : public QLabel {
-  Q_OBJECT
-
-  public:
-    explicit ColorLabel(QWidget* parent = nullptr);
-    virtual ~ColorLabel() = default;
-
-    QColor color() const;
-    void setColor(const QColor& color);
-
-  protected:
-    void paintEvent(QPaintEvent* event);
-
-  private:
-    QColor m_color;
-};
-
-#endif // COLORLABEL_H
diff --git a/src/librssguard/gui/dialogs/formsettings.cpp b/src/librssguard/gui/dialogs/formsettings.cpp
index 49d261092..dc996ce1d 100644
--- a/src/librssguard/gui/dialogs/formsettings.cpp
+++ b/src/librssguard/gui/dialogs/formsettings.cpp
@@ -43,7 +43,7 @@ FormSettings::FormSettings(QWidget& parent)
 }
 
 FormSettings::~FormSettings() {
-  qDebug("Destroying FormSettings distance.");
+  qDebugNN << LOGSEC_GUI << "Destroying FormSettings distance.";
 }
 
 void FormSettings::saveSettings() {
diff --git a/src/librssguard/gui/dialogs/formupdate.cpp b/src/librssguard/gui/dialogs/formupdate.cpp
index 13b73165c..ff0ee3d43 100644
--- a/src/librssguard/gui/dialogs/formupdate.cpp
+++ b/src/librssguard/gui/dialogs/formupdate.cpp
@@ -94,6 +94,7 @@ void FormUpdate::checkForUpdates() {
       }
     }
   });
+
   qApp->system()->checkForUpdates();
 }
 
@@ -133,12 +134,14 @@ void FormUpdate::saveUpdateFile(const QByteArray& file_contents) {
       m_readyToInstall = true;
     }
     else {
-      qDebug("Cannot save downloaded update file because target temporary file '%s' cannot be "
-             "opened for writing.", qPrintable(output_file_name));
+      qDebugNN << LOGSEC_GUI
+               << "Cannot save downloaded update file because target temporary file '"
+               << output_file_name
+               << "' cannot be opened for writing.";
     }
   }
   else {
-    qDebug("Cannot save downloaded update file because no TEMP directory is available.");
+    qDebugNN << LOGSEC_GUI << "Cannot save downloaded update file because no TEMP directory is available.";
   }
 }
 
@@ -167,10 +170,11 @@ void FormUpdate::loadAvailableFiles() {
 }
 
 void FormUpdate::updateCompleted(QNetworkReply::NetworkError status, const QByteArray& contents) {
-  qDebug("Download of application update file was completed with code '%d'.", status);
+  qDebugNN << LOGSEC_GUI
+           << "Download of application update file was completed with code '" << status << "'.";
 
   switch (status) {
-    case QNetworkReply::NoError:
+    case QNetworkReply::NetworkError::NoError:
       saveUpdateFile(contents);
       m_ui.m_lblStatus->setStatus(WidgetWithStatus::StatusType::Ok, tr("Downloaded successfully"),
                                   tr("Package was downloaded successfully.\nYou can install it now."));
@@ -200,7 +204,11 @@ void FormUpdate::startUpdate() {
 
   if (m_readyToInstall) {
     close();
-    qDebug("Preparing to launch external installer '%s'.", qPrintable(QDir::toNativeSeparators(m_updateFilePath)));
+    qDebugNN << LOGSEC_GUI
+             << "Preparing to launch external installer '"
+             << QDir::toNativeSeparators(m_updateFilePath)
+             << "'.";
+
 #if defined(Q_OS_WIN)
     HINSTANCE exec_result = ShellExecute(nullptr,
                                          nullptr,
@@ -210,7 +218,7 @@ void FormUpdate::startUpdate() {
                                          SW_NORMAL);
 
     if (exec_result <= HINSTANCE(32)) {
-      qDebug("External updater was not launched due to error.");
+      qDebugNN << LOGSEC_GUI << "External updater was not launched due to error.";
       qApp->showGuiMessage(tr("Cannot update application"),
                            tr("Cannot launch external updater. Update application manually."),
                            QSystemTrayIcon::Warning, this);
@@ -219,6 +227,7 @@ void FormUpdate::startUpdate() {
       qApp->quit();
     }
 #endif
+
   }
   else if (update_for_this_system) {
     updateProgress(0, 100);
diff --git a/src/librssguard/gui/feedmessageviewer.cpp b/src/librssguard/gui/feedmessageviewer.cpp
index c0d653805..1f24665d3 100644
--- a/src/librssguard/gui/feedmessageviewer.cpp
+++ b/src/librssguard/gui/feedmessageviewer.cpp
@@ -64,7 +64,7 @@ FeedMessageViewer::FeedMessageViewer(QWidget* parent) : TabContent(parent), m_to
 }
 
 FeedMessageViewer::~FeedMessageViewer() {
-  qDebug("Destroying FeedMessageViewer instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying FeedMessageViewer instance.";
 }
 
 #if defined(USE_WEBENGINE)
diff --git a/src/librssguard/gui/feedsview.cpp b/src/librssguard/gui/feedsview.cpp
index dc66aa8f5..e01b2f014 100755
--- a/src/librssguard/gui/feedsview.cpp
+++ b/src/librssguard/gui/feedsview.cpp
@@ -48,7 +48,7 @@ FeedsView::FeedsView(QWidget* parent)
 }
 
 FeedsView::~FeedsView() {
-  qDebug("Destroying FeedsView instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying FeedsView instance.";
 }
 
 void FeedsView::reloadFontSettings() {
diff --git a/src/librssguard/gui/messagebox.cpp b/src/librssguard/gui/messagebox.cpp
index cf81845ee..474e8383f 100644
--- a/src/librssguard/gui/messagebox.cpp
+++ b/src/librssguard/gui/messagebox.cpp
@@ -36,16 +36,16 @@ void MessageBox::setCheckBox(QMessageBox* msg_box, const QString& text, bool* da
 
 QIcon MessageBox::iconForStatus(QMessageBox::Icon status) {
   switch (status) {
-    case QMessageBox::Information:
+    case QMessageBox::Icon::Information:
       return qApp->icons()->fromTheme(QSL("dialog-information"));
 
-    case QMessageBox::Warning:
+    case QMessageBox::Icon::Warning:
       return qApp->icons()->fromTheme(QSL("dialog-warning"));
 
-    case QMessageBox::Critical:
+    case QMessageBox::Icon::Critical:
       return qApp->icons()->fromTheme(QSL("dialog-error"));
 
-    case QMessageBox::Question:
+    case QMessageBox::Icon::Question:
       return qApp->icons()->fromTheme(QSL("dialog-question"));
 
     default:
diff --git a/src/librssguard/gui/messagesview.cpp b/src/librssguard/gui/messagesview.cpp
index 62a8d68bf..8288ebeda 100644
--- a/src/librssguard/gui/messagesview.cpp
+++ b/src/librssguard/gui/messagesview.cpp
@@ -42,7 +42,7 @@ MessagesView::MessagesView(QWidget* parent) : QTreeView(parent), m_contextMenu(n
 }
 
 MessagesView::~MessagesView() {
-  qDebug("Destroying MessagesView instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying MessagesView instance.";
 }
 
 void MessagesView::reloadFontSettings() {
@@ -128,7 +128,10 @@ void MessagesView::reloadSelections() {
 
   const QDateTime dt2 = QDateTime::currentDateTime();
 
-  qDebug("Reloading of msg selections took %lld miliseconds.", dt1.msecsTo(dt2));
+  qDebugNN << LOGSEC_GUI
+           << "Reloading of msg selections took "
+           << dt1.msecsTo(dt2)
+           << " miliseconds.";
 }
 
 void MessagesView::setupAppearance() {
@@ -163,7 +166,7 @@ void MessagesView::focusInEvent(QFocusEvent* event) {
 void MessagesView::keyPressEvent(QKeyEvent* event) {
   QTreeView::keyPressEvent(event);
 
-  if (event->key() == Qt::Key_Delete) {
+  if (event->key() == Qt::Key::Key_Delete) {
     deleteSelectedMessages();
   }
 }
@@ -248,7 +251,7 @@ void MessagesView::mousePressEvent(QMouseEvent* event) {
   QTreeView::mousePressEvent(event);
 
   switch (event->button()) {
-    case Qt::LeftButton: {
+    case Qt::MouseButton::LeftButton: {
       // Make sure that message importance is switched when user
       // clicks the "important" column.
       const QModelIndex clicked_index = indexAt(event->pos());
@@ -266,7 +269,7 @@ void MessagesView::mousePressEvent(QMouseEvent* event) {
       break;
     }
 
-    case Qt::MiddleButton: {
+    case Qt::MouseButton::MiddleButton: {
       // Make sure that message importance is switched when user
       // clicks the "important" column.
       const QModelIndex clicked_index = indexAt(event->pos());
@@ -297,11 +300,10 @@ void MessagesView::selectionChanged(const QItemSelection& selected, const QItemS
   const QModelIndex current_index = currentIndex();
   const QModelIndex mapped_current_index = m_proxyModel->mapToSource(current_index);
 
-  qDebug("Current row changed - row [%d,%d] source [%d, %d].",
-         current_index.row(),
-         current_index.column(),
-         mapped_current_index.row(),
-         mapped_current_index.column());
+  qDebugNN << LOGSEC_GUI
+           << "Current row changed - proxy '"
+           << current_index << "', source '"
+           << mapped_current_index << "'.";
 
   if (mapped_current_index.isValid() && selected_rows.count() > 0) {
     Message message = m_sourceModel->messageAt(m_proxyModel->mapToSource(current_index).row());
diff --git a/src/librssguard/gui/messagetextbrowser.cpp b/src/librssguard/gui/messagetextbrowser.cpp
index d957cf8fd..238ceec13 100644
--- a/src/librssguard/gui/messagetextbrowser.cpp
+++ b/src/librssguard/gui/messagetextbrowser.cpp
@@ -12,7 +12,7 @@ QVariant MessageTextBrowser::loadResource(int type, const QUrl& name) {
   Q_UNUSED(name)
 
   switch (type) {
-    case QTextDocument::ImageResource: {
+    case QTextDocument::ResourceType::ImageResource: {
       if (qApp->settings()->value(GROUP(Messages), SETTING(Messages::DisplayImagePlaceholders)).toBool()) {
         if (m_imagePlaceholder.isNull()) {
           m_imagePlaceholder = qApp->icons()->miscPixmap(QSL("image-placeholder")).scaledToWidth(20, Qt::FastTransformation);
diff --git a/src/librssguard/gui/newspaperpreviewer.cpp b/src/librssguard/gui/newspaperpreviewer.cpp
index 82d875083..2fb275655 100644
--- a/src/librssguard/gui/newspaperpreviewer.cpp
+++ b/src/librssguard/gui/newspaperpreviewer.cpp
@@ -41,7 +41,7 @@ void NewspaperPreviewer::showMoreMessages() {
   else {
     qApp->showGuiMessage(tr("Cannot show more messages"),
                          tr("Cannot show more messages because parent feed was removed."),
-                         QSystemTrayIcon::Warning,
+                         QSystemTrayIcon::MessageIcon::Warning,
                          qApp->mainForm(), true);
   }
 }
diff --git a/src/librssguard/gui/settings/settingsdatabase.cpp b/src/librssguard/gui/settings/settingsdatabase.cpp
index c2f1e9003..0e770b326 100644
--- a/src/librssguard/gui/settings/settingsdatabase.cpp
+++ b/src/librssguard/gui/settings/settingsdatabase.cpp
@@ -52,8 +52,8 @@ void SettingsDatabase::mysqlTestConnection() {
   const QString interpretation = qApp->database()->mysqlInterpretErrorCode(error_code);
 
   switch (error_code) {
-    case DatabaseFactory::MySQLError::MySQLOk:
-    case DatabaseFactory::MySQLError::MySQLUnknownDatabase:
+    case DatabaseFactory::MySQLError::Ok:
+    case DatabaseFactory::MySQLError::UnknownDatabase:
       m_ui->m_lblMysqlTestResult->setStatus(WidgetWithStatus::StatusType::Ok, interpretation, interpretation);
       break;
 
@@ -109,7 +109,10 @@ void SettingsDatabase::selectSqlBackend(int index) {
     m_ui->m_stackedDatabaseDriver->setCurrentIndex(1);
   }
   else {
-    qWarning("GUI for given database driver '%s' is not available.", qPrintable(selected_db_driver));
+    qWarningNN << LOGSEC_GUI
+               << "GUI for given database driver '"
+               << selected_db_driver
+               << "' is not available.";
   }
 }
 
diff --git a/src/librssguard/gui/statusbar.cpp b/src/librssguard/gui/statusbar.cpp
index de791b8a0..7ef78c2e0 100644
--- a/src/librssguard/gui/statusbar.cpp
+++ b/src/librssguard/gui/statusbar.cpp
@@ -49,14 +49,15 @@ StatusBar::StatusBar(QWidget* parent) : QStatusBar(parent), m_mutex(new Mutex(QM
 
 StatusBar::~StatusBar() {
   clear();
-  qDebug("Destroying StatusBar instance.");
+  qDebugNN << LOGSEC_GUI "Destroying StatusBar instance.";
 }
 
 QList<QAction*> StatusBar::availableActions() const {
   QList<QAction*> actions = qApp->userActions();
 
   // Now, add placeholder actions for custom stuff.
-  actions << m_barProgressDownloadAction << m_barProgressFeedsAction << m_lblProgressDownloadAction << m_lblProgressFeedsAction;
+  actions << m_barProgressDownloadAction << m_barProgressFeedsAction
+          << m_lblProgressDownloadAction << m_lblProgressFeedsAction;
 
   return actions;
 }
diff --git a/src/librssguard/gui/systemtrayicon.cpp b/src/librssguard/gui/systemtrayicon.cpp
index 436ed89b4..91232acec 100644
--- a/src/librssguard/gui/systemtrayicon.cpp
+++ b/src/librssguard/gui/systemtrayicon.cpp
@@ -31,7 +31,7 @@ SystemTrayIcon::SystemTrayIcon(const QString& normal_icon, const QString& plain_
   : QSystemTrayIcon(parent),
   m_normalIcon(normal_icon),
   m_plainPixmap(plain_icon) {
-  qDebug("Creating SystemTrayIcon instance.");
+  qDebugNN << LOGSEC_GUI << "Creating SystemTrayIcon instance.";
   m_font.setBold(true);
 
   // Initialize icon.
@@ -43,7 +43,7 @@ SystemTrayIcon::SystemTrayIcon(const QString& normal_icon, const QString& plain_
 }
 
 SystemTrayIcon::~SystemTrayIcon() {
-  qDebug("Destroying SystemTrayIcon instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying SystemTrayIcon instance.";
   hide();
 }
 
@@ -82,19 +82,17 @@ void SystemTrayIcon::showPrivate() {
   QSystemTrayIcon::show();
   emit shown();
 
-  qDebug("Tray icon displayed.");
+  qDebugNN << LOGSEC_GUI << "Tray icon displayed.";
 }
 
 void SystemTrayIcon::show() {
 #if defined(Q_OS_WIN)
-
   // Show immediately.
-  qDebug("Showing tray icon immediately.");
+  qDebugNN << LOGSEC_GUI << "Showing tray icon immediately.";
   showPrivate();
 #else
-
   // Delay avoids race conditions and tray icon is properly displayed.
-  qDebug("Showing tray icon with 1000 ms delay.");
+  qDebugNN << LOGSEC_GUI << "Showing tray icon with 1000 ms delay.";
   QTimer::singleShot(1000, this, SLOT(showPrivate()));
 #endif
 }
diff --git a/src/librssguard/gui/tabbar.cpp b/src/librssguard/gui/tabbar.cpp
index fde45d09b..200041d54 100644
--- a/src/librssguard/gui/tabbar.cpp
+++ b/src/librssguard/gui/tabbar.cpp
@@ -17,7 +17,7 @@ TabBar::TabBar(QWidget* parent) : QTabBar(parent) {
 }
 
 TabBar::~TabBar() {
-  qDebug("Destroying TabBar instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying TabBar instance.";
 }
 
 void TabBar::setTabType(int index, const TabBar::TabType& type) {
diff --git a/src/librssguard/gui/tabwidget.cpp b/src/librssguard/gui/tabwidget.cpp
index 71eeab61b..1ba44858b 100644
--- a/src/librssguard/gui/tabwidget.cpp
+++ b/src/librssguard/gui/tabwidget.cpp
@@ -33,7 +33,7 @@ TabWidget::TabWidget(QWidget* parent) : QTabWidget(parent), m_menuMain(nullptr)
 }
 
 TabWidget::~TabWidget() {
-  qDebug("Destroying TabWidget instance.");
+  qDebugNN << LOGSEC_GUI << "Destroying TabWidget instance.";
 }
 
 void TabWidget::setupMainMenuButton() {
diff --git a/src/librssguard/gui/timespinbox.cpp b/src/librssguard/gui/timespinbox.cpp
index 77e502ebb..abc91d8e3 100644
--- a/src/librssguard/gui/timespinbox.cpp
+++ b/src/librssguard/gui/timespinbox.cpp
@@ -77,7 +77,7 @@ void TimeSpinBox::fixup(QString& input) const {
 
 QValidator::State TimeSpinBox::validate(QString& input, int& pos) const {
   Q_UNUSED(pos)
-  return (valueFromText(input) != -1.0) ? QValidator::Acceptable : QValidator::Intermediate;
+  return (valueFromText(input) != -1.0) ? QValidator::State::Acceptable : QValidator::State::Intermediate;
 }
 
 TimeSpinBox::Mode TimeSpinBox::mode() const {
diff --git a/src/librssguard/librssguard.pro b/src/librssguard/librssguard.pro
index 941e52649..be2bb6528 100644
--- a/src/librssguard/librssguard.pro
+++ b/src/librssguard/librssguard.pro
@@ -47,7 +47,6 @@ HEADERS += core/feeddownloader.h \
            exceptions/ioexception.h \
            gui/baselineedit.h \
            gui/basetoolbar.h \
-           gui/colorlabel.h \
            gui/comboboxwithstatus.h \
            gui/dialogs/formabout.h \
            gui/dialogs/formaddaccount.h \
@@ -192,7 +191,6 @@ SOURCES += core/feeddownloader.cpp \
            exceptions/ioexception.cpp \
            gui/baselineedit.cpp \
            gui/basetoolbar.cpp \
-           gui/colorlabel.cpp \
            gui/comboboxwithstatus.cpp \
            gui/dialogs/formabout.cpp \
            gui/dialogs/formaddaccount.cpp \
diff --git a/src/librssguard/miscellaneous/application.cpp b/src/librssguard/miscellaneous/application.cpp
index 82d341ca8..71a22506f 100755
--- a/src/librssguard/miscellaneous/application.cpp
+++ b/src/librssguard/miscellaneous/application.cpp
@@ -94,7 +94,7 @@ Application::Application(const QString& id, int& argc, char** argv)
 }
 
 Application::~Application() {
-  qDebug("Destroying Application instance.");
+  qDebugNN << LOGSEC_CORE << "Destroying Application instance.";
 }
 
 void Application::reactOnForeignNotifications() {
@@ -104,11 +104,11 @@ void Application::reactOnForeignNotifications() {
 void Application::hideOrShowMainForm() {
   // Display main window.
   if (qApp->settings()->value(GROUP(GUI), SETTING(GUI::MainWindowStartsHidden)).toBool() && SystemTrayIcon::isSystemTrayActivated()) {
-    qDebug("Hiding the main window when the application is starting.");
+    qDebugNN << LOGSEC_CORE << "Hiding the main window when the application is starting.";
     mainForm()->switchVisibility(true);
   }
   else {
-    qDebug("Showing the main window when the application is starting.");
+    qDebugNN << LOGSEC_CORE << "Showing the main window when the application is starting.";
     mainForm()->show();
   }
 }
@@ -322,7 +322,11 @@ void Application::restoreDatabaseSettings(bool restore_database, bool restore_se
 }
 
 void Application::processExecutionMessage(const QString& message) {
-  qDebug("Received '%s' execution message from another application instance.", qPrintable(message));
+  qDebugNN << LOGSEC_CORE
+           << "Received '"
+           << message
+           << "' execution message from another application instance.";
+
   const QStringList messages = message.split(ARGUMENTS_LIST_SEPARATOR);
 
   if (messages.contains(APP_QUIT_INSTANCE)) {
@@ -378,14 +382,14 @@ NetworkUrlInterceptor* Application::urlIinterceptor() {
 void Application::showTrayIcon() {
   // Display tray icon if it is enabled and available.
   if (SystemTrayIcon::isSystemTrayActivated()) {
-    qDebug("Showing tray icon.");
+    qDebugNN << LOGSEC_CORE << "Showing tray icon.";
     trayIcon()->show();
   }
 }
 
 void Application::deleteTrayIcon() {
   if (m_trayIcon != nullptr) {
-    qDebug("Disabling tray icon, deleting it and raising main application window.");
+    qDebugNN << LOGSEC_CORE << "Disabling tray icon, deleting it and raising main application window.";
     m_mainForm->display();
     delete m_trayIcon;
     m_trayIcon = nullptr;
@@ -406,28 +410,29 @@ void Application::showGuiMessage(const QString& title, const QString& message,
     MessageBox::show(parent, QMessageBox::Icon(message_type), title, message);
   }
   else {
-    qDebug("Silencing GUI message: '%s'.", qPrintable(message));
+    qDebugNN << LOGSEC_CORE << "Silencing GUI message: '" << message << "'.";
   }
 }
 
 void Application::onCommitData(QSessionManager& manager) {
-  qDebug("OS asked application to commit its data.");
+  qDebugNN << LOGSEC_CORE << "OS asked application to commit its data.";
 
   onAboutToQuit();
 
-  manager.setRestartHint(QSessionManager::RestartNever);
+  manager.setRestartHint(QSessionManager::RestartHint::RestartNever);
   manager.release();
 }
 
 void Application::onSaveState(QSessionManager& manager) {
-  qDebug("OS asked application to save its state.");
-  manager.setRestartHint(QSessionManager::RestartNever);
+  qDebugNN << LOGSEC_CORE << "OS asked application to save its state.";
+
+  manager.setRestartHint(QSessionManager::RestartHint::RestartNever);
   manager.release();
 }
 
 void Application::onAboutToQuit() {
   if (m_quitLogicDone) {
-    qWarning("On-close logic is already done.");
+    qWarningNN << LOGSEC_CORE << "On-close logic is already done.";
     return;
   }
 
@@ -441,7 +446,7 @@ void Application::onAboutToQuit() {
   const bool locked_safely = feedUpdateLock()->tryLock(4 * CLOSE_LOCK_TIMEOUT);
 
   processEvents();
-  qDebug("Cleaning up resources and saving application state.");
+  qDebugNN << LOGSEC_CORE << "Cleaning up resources and saving application state.";
 
 #if defined(Q_OS_WIN)
   system()->removeTrolltechJunkRegistryKeys();
@@ -449,7 +454,7 @@ void Application::onAboutToQuit() {
 
   if (locked_safely) {
     // Application obtained permission to close in a safe way.
-    qDebug("Close lock was obtained safely.");
+    qDebugNN << LOGSEC_CORE << "Close lock was obtained safely.";
 
     // We locked the lock to exit peacefully, unlock it to avoid warnings.
     feedUpdateLock()->unlock();
@@ -457,7 +462,7 @@ void Application::onAboutToQuit() {
   else {
     // Request for write lock timed-out. This means
     // that some critical action can be processed right now.
-    qDebug("Close lock timed-out.");
+    qWarningNN << LOGSEC_CORE << "Close lock timed-out.";
   }
 
   qApp->feedReader()->quit();
@@ -470,13 +475,13 @@ void Application::onAboutToQuit() {
   // Now, we can check if application should just quit or restart itself.
   if (m_shouldRestart) {
     finish();
-    qDebug("Killing local peer connection to allow another instance to start.");
+    qDebugNN << LOGSEC_CORE << "Killing local peer connection to allow another instance to start.";
 
     if (QProcess::startDetached(QDir::toNativeSeparators(applicationFilePath()), {})) {
-      qDebug("New application instance was started.");
+      qDebugNN << LOGSEC_CORE << "New application instance was started.";
     }
     else {
-      qWarning("New application instance was not started successfully.");
+      qCriticalNN << LOGSEC_CORE << "New application instance was not started successfully.";
     }
   }
 }
diff --git a/src/librssguard/miscellaneous/autosaver.cpp b/src/librssguard/miscellaneous/autosaver.cpp
index 5658a1d00..25d4b06fa 100644
--- a/src/librssguard/miscellaneous/autosaver.cpp
+++ b/src/librssguard/miscellaneous/autosaver.cpp
@@ -6,6 +6,8 @@
 #include <QDir>
 #include <QMetaObject>
 
+#include "definitions/definitions.h"
+
 #define AUTOSAVE_IN  (1000 * 3)  // seconds
 #define MAXWAIT      (1000 * 15) // seconds
 
@@ -15,10 +17,10 @@ AutoSaver::AutoSaver(QObject* parent) : QObject(parent) {
 
 AutoSaver::~AutoSaver() {
   if (m_timer.isActive()) {
-    qWarning("AutoSaver: still active when destroyed, changes not saved.");
+    qWarningNN << LOGSEC_CORE << "AutoSaver still active when destroyed, changes not saved.";
 
     if (parent() != nullptr && parent()->metaObject() != nullptr) {
-      qWarning("Should call saveIfNeccessary.");
+      qDebugNN << LOGSEC_CORE << "Should call saveIfNeccessary.";
     }
   }
 }
@@ -51,7 +53,7 @@ void AutoSaver::saveIfNeccessary() {
     m_firstChange.invalidate();
 
     if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) {
-      qWarning("AutoSaver: error invoking slot save() on parent.");
+      qCriticalNN << LOGSEC_CORE << ("AutoSaver error invoking slot save() on parent.");
     }
   }
 }
diff --git a/src/librssguard/miscellaneous/databasecleaner.cpp b/src/librssguard/miscellaneous/databasecleaner.cpp
index 1d3e38712..f2071c77d 100644
--- a/src/librssguard/miscellaneous/databasecleaner.cpp
+++ b/src/librssguard/miscellaneous/databasecleaner.cpp
@@ -11,7 +11,7 @@
 DatabaseCleaner::DatabaseCleaner(QObject* parent) : QObject(parent) {}
 
 void DatabaseCleaner::purgeDatabaseData(const CleanerOrders& which_data) {
-  qDebug().nospace() << "Performing database cleanup in thread: \'" << QThread::currentThreadId() << "\'.";
+  qDebugNN << LOGSEC_DB << "Performing database cleanup in thread: '" << QThread::currentThreadId() << "'.";
 
   // Inform everyone about the start of the process.
   emit purgeStarted();
diff --git a/src/librssguard/miscellaneous/databasefactory.cpp b/src/librssguard/miscellaneous/databasefactory.cpp
index 3b05df7b6..d344d0303 100644
--- a/src/librssguard/miscellaneous/databasefactory.cpp
+++ b/src/librssguard/miscellaneous/databasefactory.cpp
@@ -91,15 +91,18 @@ DatabaseFactory::MySQLError DatabaseFactory::mysqlTestConnection(const QString&
     QSqlQuery query(QSL("SELECT version();"), database);
 
     if (!query.lastError().isValid() && query.next()) {
-      qDebug("Checked MySQL database, version is '%s'.", qPrintable(query.value(0).toString()));
+      qDebugNN << LOGSEC_DB
+               << "Checked MySQL database, version is '"
+               << query.value(0).toString()
+               << "'.";
 
       // Connection succeeded, clean up the mess and return OK status.
       database.close();
-      return MySQLError::MySQLOk;
+      return MySQLError::Ok;
     }
     else {
       database.close();
-      return MySQLError::MySQLUnknownError;
+      return MySQLError::UnknownError;
     }
   }
   else if (database.lastError().isValid()) {
@@ -111,37 +114,36 @@ DatabaseFactory::MySQLError DatabaseFactory::mysqlTestConnection(const QString&
       return static_cast<MySQLError>(nat_int);
     }
     else {
-      qWarning("Failed to recognize MySQL error code: '%s'.", qPrintable(nat));
+      qWarningNN << LOGSEC_DB
+                 << "Failed to recognize MySQL error code: '"
+                 << nat
+                 << "'.";
 
-      return MySQLError::MySQLUnknownError;
+      return MySQLError::UnknownError;
     }
   }
   else {
-    return MySQLError::MySQLUnknownError;
+    return MySQLError::UnknownError;
   }
 }
 
 QString DatabaseFactory::mysqlInterpretErrorCode(MySQLError error_code) const {
   switch (error_code) {
-    case MySQLError::MySQLOk:
+    case MySQLError::Ok:
       return tr("MySQL server works as expected.");
 
-    case MySQLError::MySQLUnknownDatabase:
+    case MySQLError::UnknownDatabase:
       return tr("Selected database does not exist (yet). It will be created. It's okay.");
 
-    case MySQLError::MySQLCantConnect:
-    case MySQLError::MySQLConnectionError:
-    case MySQLError::MySQLUnknownHost:
+    case MySQLError::CantConnect:
+    case MySQLError::ConnectionError:
+    case MySQLError::UnknownHost:
       return tr("No MySQL server is running in the target destination.");
 
-    case MySQLError::MySQLAccessDenied:
-
-      //: Access to MySQL server was denied.
+    case MySQLError::AccessDenied:
       return tr("Access denied. Invalid username or password used.");
 
     default:
-
-      //: Unknown MySQL error arised.
       return tr("Unknown error: '%1'.").arg(int(error_code));
   }
 }
@@ -167,14 +169,18 @@ void DatabaseFactory::finishRestoration() {
   const QString backup_database_file = m_sqliteDatabaseFilePath + QDir::separator() + BACKUP_NAME_DATABASE + BACKUP_SUFFIX_DATABASE;
 
   if (QFile::exists(backup_database_file)) {
-    qWarning("Backup database file '%s' was detected. Restoring it.", qPrintable(QDir::toNativeSeparators(backup_database_file)));
+    qDebugNN << LOGSEC_DB
+             << "Backup database file '"
+             << QDir::toNativeSeparators(backup_database_file)
+             << "' was detected. Restoring it.";
 
     if (IOFactory::copyFile(backup_database_file, m_sqliteDatabaseFilePath + QDir::separator() + APP_DB_SQLITE_FILE)) {
       QFile::remove(backup_database_file);
-      qDebug("Database file was restored successully.");
+      qDebugNN << LOGSEC_DB << "Database file was restored successully.";
     }
     else {
-      qCritical("Database file was NOT restored due to error when copying the file.");
+      qCriticalNN << LOGSEC_DB
+                  << "Database file was NOT restored due to error when copying the file.";
     }
   }
 }
@@ -190,7 +196,8 @@ QSqlDatabase DatabaseFactory::sqliteInitializeInMemoryDatabase() {
   database.setDatabaseName(QSL("file::memory:"));
 
   if (!database.open()) {
-    qFatal("In-memory SQLite database was NOT opened. Delivered error message: '%s'", qPrintable(database.lastError().text()));
+    qFatal("In-memory SQLite database was NOT opened. Delivered error message: '%s'",
+           qPrintable(database.lastError().text()));
   }
   else {
     QSqlQuery query_db(database);
@@ -208,7 +215,7 @@ QSqlDatabase DatabaseFactory::sqliteInitializeInMemoryDatabase() {
     query_db.exec(QSL("SELECT inf_value FROM Information WHERE inf_key = 'schema_version'"));
 
     if (query_db.lastError().isValid()) {
-      qWarning("Error occurred. In-memory SQLite database is not initialized. Initializing now.");
+      qWarningNN << LOGSEC_DB << "Error occurred. In-memory SQLite database is not initialized. Initializing now.";
       QFile file_init(APP_SQL_PATH + QDir::separator() + APP_DB_SQLITE_INIT);
 
       if (!file_init.open(QIODevice::ReadOnly | QIODevice::Text)) {
@@ -231,17 +238,20 @@ QSqlDatabase DatabaseFactory::sqliteInitializeInMemoryDatabase() {
         query_db.exec(statement);
 
         if (query_db.lastError().isValid()) {
-          qFatal("In-memory SQLite database initialization failed. Initialization script '%s' is not correct.", APP_DB_SQLITE_INIT);
+          qFatal("In-memory SQLite database initialization failed. Initialization script '%s' is not correct.",
+                 APP_DB_SQLITE_INIT);
         }
       }
 
       database.commit();
-      qDebug("In-memory SQLite database backend should be ready now.");
+      qDebugNN << LOGSEC_DB << "In-memory SQLite database backend should be ready now.";
     }
     else {
       query_db.next();
-      qDebug("In-memory SQLite database connection seems to be established.");
-      qDebug("In-memory SQLite database has version '%s'.", qPrintable(query_db.value(0).toString()));
+      qDebugNN << LOGSEC_DB << "In-memory SQLite database connection seems to be established.";
+      qDebugNN << LOGSEC_DB << "In-memory SQLite database has version '"
+               << query_db.value(0).toString()
+               << "'.";
     }
 
     // Loading messages from file-based database.
@@ -267,7 +277,7 @@ QSqlDatabase DatabaseFactory::sqliteInitializeInMemoryDatabase() {
       copy_contents.exec(QString("INSERT INTO main.%1 SELECT * FROM storage.%1;").arg(table));
     }
 
-    qDebug("Copying data from file-based database into working in-memory database.");
+    qDebugNN << LOGSEC_DB << "Copying data from file-based database into working in-memory database.";
 
     // Detach database and finish.
     copy_contents.exec(QSL("DETACH 'storage'"));
@@ -322,7 +332,7 @@ QSqlDatabase DatabaseFactory::sqliteInitializeFileBasedDatabase(const QString& c
 
     // Sample query which checks for existence of tables.
     if (!query_db.exec(QSL("SELECT inf_value FROM Information WHERE inf_key = 'schema_version'"))) {
-      qWarning("Error occurred. File-based SQLite database is not initialized. Initializing now.");
+      qWarningNN << LOGSEC_DB << "Error occurred. File-based SQLite database is not initialized. Initializing now.";
       QFile file_init(APP_SQL_PATH + QDir::separator() + APP_DB_SQLITE_INIT);
 
       if (!file_init.open(QIODevice::ReadOnly | QIODevice::Text)) {
@@ -352,7 +362,7 @@ QSqlDatabase DatabaseFactory::sqliteInitializeFileBasedDatabase(const QString& c
 
       database.commit();
       query_db.finish();
-      qDebug("File-based SQLite database backend should be ready now.");
+      qDebugNN << LOGSEC_DB << "File-based SQLite database backend should be ready now.";
     }
     else {
       query_db.next();
@@ -362,9 +372,12 @@ QSqlDatabase DatabaseFactory::sqliteInitializeFileBasedDatabase(const QString& c
 
       if (installed_db_schema.toInt() < QString(APP_DB_SCHEMA_VERSION).toInt()) {
         if (sqliteUpdateDatabaseSchema(database, installed_db_schema)) {
-          qDebug("Database schema was updated from '%s' to '%s' successully or it is already up to date.",
-                 qPrintable(installed_db_schema),
-                 APP_DB_SCHEMA_VERSION);
+          qDebugNN << LOGSEC_DB
+                   << "Database schema was updated from '"
+                   << installed_db_schema
+                   << "' to '"
+                   << APP_DB_SCHEMA_VERSION
+                   << "' successully or it is already up to date.";
         }
         else {
           qFatal("Database schema was not updated from '%s' to '%s' successully.",
@@ -373,10 +386,16 @@ QSqlDatabase DatabaseFactory::sqliteInitializeFileBasedDatabase(const QString& c
         }
       }
 
-      qDebug("File-based SQLite database connection '%s' to file '%s' seems to be established.",
-             qPrintable(connection_name),
-             qPrintable(QDir::toNativeSeparators(database.databaseName())));
-      qDebug("File-based SQLite database has version '%s'.", qPrintable(installed_db_schema));
+      qDebugNN << LOGSEC_DB
+               << "File-based SQLite database connection '"
+               << connection_name
+               << "' to file '"
+               << QDir::toNativeSeparators(database.databaseName())
+               << "' seems to be established.";
+      qDebugNN << LOGSEC_DB
+               << "File-based SQLite database has version '"
+               << installed_db_schema
+               << "'.";
     }
   }
 
@@ -395,7 +414,7 @@ bool DatabaseFactory::sqliteUpdateDatabaseSchema(const QSqlDatabase& database, c
 
   // Now, it would be good to create backup of SQLite DB file.
   if (IOFactory::copyFile(sqliteDatabaseFilePath(), sqliteDatabaseFilePath() + ".bak")) {
-    qDebug("Creating backup of SQLite DB file.");
+    qDebugNN << LOGSEC_DB << "Creating backup of SQLite DB file.";
   }
   else {
     qFatal("Creation of backup SQLite DB file failed.");
@@ -433,7 +452,13 @@ bool DatabaseFactory::sqliteUpdateDatabaseSchema(const QSqlDatabase& database, c
     }
 
     // Increment the version.
-    qDebug("Updating database schema: '%d' -> '%d'.", working_version, working_version + 1);
+    qDebugNN << LOGSEC_DB
+             << "Updating database schema: '"
+             << working_version
+             << "' -> '"
+             << working_version + 1
+             << "'.";
+
     working_version++;
   }
 
@@ -478,7 +503,13 @@ bool DatabaseFactory::mysqlUpdateDatabaseSchema(const QSqlDatabase& database,
     }
 
     // Increment the version.
-    qDebug("Updating database schema: '%d' -> '%d'.", working_version, working_version + 1);
+    qDebugNN << LOGSEC_DB
+             << "Updating database schema: '"
+             << working_version
+             << "' -> '"
+             << working_version + 1
+             << "'.";
+
     working_version++;
   }
 
@@ -522,7 +553,7 @@ QString DatabaseFactory::humanDriverName(const QString& driver_code) const {
 }
 
 void DatabaseFactory::removeConnection(const QString& connection_name) {
-  qDebug("Removing database connection '%s'.", qPrintable(connection_name));
+  qDebugNN << LOGSEC_DB << "Removing database connection '" << connection_name << "'.";
   QSqlDatabase::removeDatabase(connection_name);
 }
 
@@ -536,7 +567,7 @@ QString DatabaseFactory::obtainBeginTransactionSql() const {
 }
 
 void DatabaseFactory::sqliteSaveMemoryDatabase() {
-  qDebug("Saving in-memory working database back to persistent file-based storage.");
+  qDebugNN << LOGSEC_DB << "Saving in-memory working database back to persistent file-based storage.";
 
   QSqlDatabase database = sqliteConnection(QSL("SaveFromMemory"), DesiredType::StrictlyInMemory);
   QSqlDatabase file_database = sqliteConnection(QSL("SaveToFile"), DesiredType::StrictlyFileBased);
@@ -559,28 +590,37 @@ void DatabaseFactory::sqliteSaveMemoryDatabase() {
 
   for (const QString& table : tables) {
     if (copy_contents.exec(QString(QSL("DELETE FROM storage.%1;")).arg(table))) {
-      qDebug("Cleaning old data from 'storage.%s'.", qPrintable(table));
+      qDebugNN << LOGSEC_DB << "Cleaning old data from 'storage." << table << "'.";
     }
     else {
-      qCritical("Failed to clean old data from 'storage.%s', error: '%s'.",
-                qPrintable(table), qPrintable(copy_contents.lastError().text()));
+      qCriticalNN << LOGSEC_DB << "Failed to clean old data from 'storage."
+                  << table << "', error: '"
+                  << copy_contents.lastError().text() << "'.";
     }
 
     if (copy_contents.exec(QString(QSL("INSERT INTO storage.%1 SELECT * FROM main.%1;")).arg(table))) {
-      qDebug("Copying new data into 'main.%s'.", qPrintable(table));
+      qDebugNN << LOGSEC_DB << "Copying new data into 'main."
+               << table << "'.";
     }
     else {
-      qCritical("Failed to copy new data to 'main.%s', error: '%s'.",
-                qPrintable(table), qPrintable(copy_contents.lastError().text()));
+      qCriticalNN << LOGSEC_DB
+                  << "Failed to copy new data to 'main."
+                  << table
+                  << "', error: '"
+                  << copy_contents.lastError().text()
+                  << "'.";
     }
   }
 
   // Detach database and finish.
   if (copy_contents.exec(QSL("DETACH 'storage'"))) {
-    qDebug("Detaching persistent SQLite file.");
+    qDebugNN << LOGSEC_DB << "Detaching persistent SQLite file.";
   }
   else {
-    qCritical("Failed to detach SQLite file, error: '%s'.", qPrintable(copy_contents.lastError().text()));
+    qCriticalNN << LOGSEC_DB
+                << "Failed to detach SQLite file, error: '"
+                << copy_contents.lastError().text()
+                << "'.";
   }
 
   copy_contents.finish();
@@ -592,7 +632,7 @@ void DatabaseFactory::determineDriver() {
   if (db_driver == APP_DB_MYSQL_DRIVER && QSqlDatabase::isDriverAvailable(APP_DB_SQLITE_DRIVER)) {
     // User wants to use MySQL and MySQL is actually available. Use it.
     m_activeDatabaseDriver = UsedDriver::MYSQL;
-    qDebug("Working database source was as MySQL database.");
+    qDebugNN << LOGSEC_DB << "Working database source was as MySQL database.";
   }
   else {
     // User wants to use SQLite, which is always available. Check if file-based
@@ -600,12 +640,12 @@ void DatabaseFactory::determineDriver() {
     if (qApp->settings()->value(GROUP(Database), SETTING(Database::UseInMemory)).toBool()) {
       // Use in-memory SQLite database.
       m_activeDatabaseDriver = UsedDriver::SQLITE_MEMORY;
-      qDebug("Working database source was determined as SQLite in-memory database.");
+      qDebugNN << LOGSEC_DB << "Working database source was determined as SQLite in-memory database.";
     }
     else {
       // Use strictly file-base SQLite database.
       m_activeDatabaseDriver = UsedDriver::SQLITE;
-      qDebug("Working database source was determined as SQLite file-based database.");
+      qDebugNN << LOGSEC_DB << "Working database source was determined as SQLite file-based database.";
     }
 
     sqliteAssemblyDatabaseFilePath();
@@ -625,7 +665,10 @@ QSqlDatabase DatabaseFactory::mysqlConnection(const QString& connection_name) {
     QSqlDatabase database;
 
     if (QSqlDatabase::contains(connection_name)) {
-      qDebug("MySQL connection '%s' is already active.", qPrintable(connection_name));
+      qDebugNN << LOGSEC_DB
+               << "MySQL connection '"
+               << connection_name
+               << "' is already active.";
 
       // This database connection was added previously, no need to
       // setup its properties.
@@ -647,9 +690,12 @@ QSqlDatabase DatabaseFactory::mysqlConnection(const QString& connection_name) {
              qPrintable(database.lastError().text()));
     }
     else {
-      qDebug("MySQL database connection '%s' to file '%s' seems to be established.",
-             qPrintable(connection_name),
-             qPrintable(QDir::toNativeSeparators(database.databaseName())));
+      qDebugNN << LOGSEC_DB
+               << "MySQL database connection '"
+               << connection_name
+               << "' to file '"
+               << QDir::toNativeSeparators(database.databaseName())
+               << "' seems to be established.";
     }
 
     return database;
@@ -667,7 +713,10 @@ QSqlDatabase DatabaseFactory::mysqlInitializeDatabase(const QString& connection_
   database.setPassword(qApp->settings()->password(GROUP(Database), SETTING(Database::MySQLPassword)).toString());
 
   if (!database.open()) {
-    qCritical("MySQL database was NOT opened. Delivered error message: '%s'", qPrintable(database.lastError().text()));
+    qCriticalNN << LOGSEC_DB
+                << "MySQL database was NOT opened. Delivered error message: '"
+                << database.lastError().text()
+                << "'.";
 
     // Now, we will display error warning and return SQLite connection.
     // Also, we set the SQLite driver as active one.
@@ -686,7 +735,7 @@ QSqlDatabase DatabaseFactory::mysqlInitializeDatabase(const QString& connection_
     if (!query_db.exec(QString("USE %1").arg(database_name))
         || !query_db.exec(QSL("SELECT inf_value FROM Information WHERE inf_key = 'schema_version'"))) {
       // If no "rssguard" database exists or schema version is wrong, then initialize it.
-      qWarning("Error occurred. MySQL database is not initialized. Initializing now.");
+      qWarningNN << LOGSEC_DB << "Error occurred. MySQL database is not initialized. Initializing now.";
       QFile file_init(APP_SQL_PATH + QDir::separator() + APP_DB_MYSQL_INIT);
 
       if (!file_init.open(QIODevice::ReadOnly | QIODevice::Text)) {
@@ -716,7 +765,7 @@ QSqlDatabase DatabaseFactory::mysqlInitializeDatabase(const QString& connection_
       }
 
       database.commit();
-      qDebug("MySQL database backend should be ready now.");
+      qDebugNN << LOGSEC_DB << "MySQL database backend should be ready now.";
     }
     else {
       // Database was previously initialized. Now just check the schema version.
diff --git a/src/librssguard/miscellaneous/databasefactory.h b/src/librssguard/miscellaneous/databasefactory.h
index ef566bcec..dae258833 100644
--- a/src/librssguard/miscellaneous/databasefactory.h
+++ b/src/librssguard/miscellaneous/databasefactory.h
@@ -27,13 +27,13 @@ class DatabaseFactory : public QObject {
 
     // Describes possible MySQL-specific errors.
     enum class MySQLError {
-      MySQLOk = 0,
-      MySQLUnknownError = 1,
-      MySQLAccessDenied = 1045,
-      MySQLUnknownDatabase = 1049,
-      MySQLConnectionError = 2002,
-      MySQLCantConnect = 2003,
-      MySQLUnknownHost = 2005
+      Ok = 0,
+      UnknownError = 1,
+      AccessDenied = 1045,
+      UnknownDatabase = 1049,
+      ConnectionError = 2002,
+      CantConnect = 2003,
+      UnknownHost = 2005
     };
 
     //