diff --git a/src/LicenseModel/LicenseModel.cpp b/src/LicenseModel/LicenseModel.cpp
index 7f328df..8b98657 100644
--- a/src/LicenseModel/LicenseModel.cpp
+++ b/src/LicenseModel/LicenseModel.cpp
@@ -1,10 +1,14 @@
 #include "LicenseModel.h"
 
 // Qt
+#include <QtConcurrent/QtConcurrent>
+#include <QDebug>
+#include <QUuid>
+#include <algorithm>
 #include <QtSql/QSqlDatabase>
 #include <QtSql/QSqlQuery>
 #include <QtSql/QSqlError>
-#include <QDebug>
+#include <QtSql/QSqlRecord>
 
 // Self
 #include <qfile.h>
@@ -14,10 +18,19 @@
 const static int COLUMN_COUNT = 9;
 
 namespace {
-quintptr licenseItemToInternalId(const LicenseModel::LicenseItem &item)
+struct LoadResult
 {
-    return reinterpret_cast<quintptr>(&item);
-}
+    QList<LicenseModel::LicenseItem> data;
+    LicenseModel::Status status = LicenseModel::Status::Ok;
+    QString error;
+};
+
+struct DeleteResult
+{
+    QList<QString> ids;
+    LicenseModel::Status status = LicenseModel::Status::Ok;
+    QString error;
+};
 }
 
 LicenseModel::LicenseModel(QObject* parent)
@@ -43,11 +56,13 @@ LicenseModel::LicenseModel(QObject* parent)
             m_status = Status::Ok;
         }
     }
+
+    if (m_db.open())
+        m_db.close();
 }
 
 LicenseModel::~LicenseModel()
 {
-    m_db.close();
 }
 
 int LicenseModel::rowCount(const QModelIndex &parent) const
@@ -166,6 +181,8 @@ bool LicenseModel::checkTables()
     }
     if (!clientTableExist)
         return false;
+    else
+        return true;
 }
 
 bool LicenseModel::prepareDatabase()
@@ -181,11 +198,11 @@ bool LicenseModel::prepareDatabase()
     {
         if (item.trimmed().isEmpty())
             continue;
-        QSqlQuery query(item.trimmed() + ";", m_db);
-        if (!query.exec())
+        QSqlQuery query(m_db);
+        if (!query.exec(item.trimmed()))
         {
             m_status = Status::DbStructError;
-            qDebug() << item.trimmed() + ";" << query.lastError().text();
+            qDebug() << item.trimmed() << query.lastError().text();
             m_errors.append(query.lastError().text());
             return false;
         }
@@ -196,28 +213,272 @@ bool LicenseModel::prepareDatabase()
 
 void LicenseModel::addClient(const LicenseItem &item)
 {
-    beginInsertRows({}, m_data.size() - 1, m_data.size() - 1);
-    m_data.append(item);
-    endInsertRows();
+    m_status = Status::Working;
+    emit statusChanged();
+
+    // handler thread finish
+    auto* watcher = new QFutureWatcher<LicenseItem>(this);
+    connect(watcher, &QFutureWatcher<LicenseItem>::finished, this, [this, watcher]() {
+        const int row = m_data.size();
+        beginInsertRows({}, row, row);
+        m_data.append(watcher->result());
+        endInsertRows();
+
+        m_status = Status::Ok;
+        emit statusChanged();
+
+        watcher->deleteLater();
+    });
+
+    // another thread lambda
+    watcher->setFuture(QtConcurrent::run([item]() {
+        const QString connectionName = QString("license_add_%1").arg(QUuid::createUuid().toString(QUuid::Id128));
+        LicenseItem output;
+        bool ok = false;
+        {
+            auto db = QSqlDatabase::addDatabase("QSQLITE", connectionName);
+            db.setDatabaseName(DB_PATH);
+            if (!db.open())
+                qDebug() << "db not open";
+            else
+            {
+                QSqlQuery queryInsert(db);
+                queryInsert.prepare(QString(
+                    "INSERT INTO clients(lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, comment) "
+                    "VALUES (:lastName, :firstName, :patronymic, :phone, :email, :city, :yourCompany, :hardwareHash, :comment);"
+                ));
+                queryInsert.bindValue(":lastName", item.lastName);
+                queryInsert.bindValue(":firstName", item.firstName);
+                queryInsert.bindValue(":patronymic", item.patronymic);
+                queryInsert.bindValue(":phone", item.phone);
+                queryInsert.bindValue(":email", item.email);
+                queryInsert.bindValue(":city", item.city);
+                queryInsert.bindValue(":yourCompany", item.yourCompany);
+                queryInsert.bindValue(":hardwareHash", item.hardwareHash);
+                queryInsert.bindValue(":comment", item.comment);
+
+                if (!queryInsert.exec())
+                    qDebug() << "queryInsert error" << queryInsert.lastError();
+                else
+                {
+                    QString itemId = QString::number(queryInsert.lastInsertId().toLongLong());
+
+                    QSqlQuery querySelect(db);
+                    querySelect.prepare(QString("SELECT * FROM clients WHERE id=:id;"));
+                    querySelect.bindValue(":id", itemId);
+
+                    if (!querySelect.exec())
+                        qDebug() << "querySelect exec error" << querySelect.lastError();
+                    else if (!querySelect.next())
+                        qDebug() << "querySelect no rows for id" << itemId;
+                    else
+                    {
+                        output.id = itemId;
+                        output.lastName = querySelect.value("lastName").toString();
+                        output.firstName = querySelect.value("firstName").toString();
+                        output.patronymic = querySelect.value("patronymic").toString();
+                        output.phone = querySelect.value("phone").toString();
+                        output.email = querySelect.value("email").toString();
+                        output.city = querySelect.value("city").toString();
+                        output.yourCompany = querySelect.value("yourCompany").toString();
+                        output.hardwareHash = querySelect.value("hardwareHash").toString();
+                        output.comment = querySelect.value("comment").toString();
+                        ok = true;
+                    }
+                }
+            }
+        }
+        QSqlDatabase::removeDatabase(connectionName);
+        if (!ok)
+            return LicenseItem();
+        return output;
+    }));
 }
 
-void LicenseModel::deleteClient(int index)
+void LicenseModel::deleteClient(const QList<int> &rows)
 {
-    beginRemoveRows({}, index, index);
-    m_data.removeAt(index);
-    endRemoveRows();
+    m_status = Status::Working;
+    emit statusChanged();
+
+    QList<QString> ids;
+    ids.reserve(rows.size());
+    for (const auto row : rows)
+    {
+        if (row < 0 || row >= m_data.size())
+            continue;
+        const QString id = m_data[row].id;
+        if (!id.isEmpty())
+            ids.append(id);
+    }
+
+    auto* watcher = new QFutureWatcher<DeleteResult>(this);
+    connect(watcher, &QFutureWatcher<DeleteResult>::finished, this, [this, watcher]() {
+        const DeleteResult result = watcher->result();
+        if (result.status != Status::Ok)
+        {
+            m_status = result.status;
+            if (!result.error.isEmpty())
+                m_errors.append(result.error);
+            emit statusChanged();
+            watcher->deleteLater();
+            return;
+        }
+
+        QList<int> indices;
+        indices.reserve(result.ids.size());
+        for (const auto &id : result.ids)
+        {
+            for (int i = 0; i < m_data.size(); ++i)
+            {
+                if (m_data[i].id == id)
+                {
+                    indices.append(i);
+                    break;
+                }
+            }
+        }
+
+        std::sort(indices.begin(), indices.end(), std::greater<int>());
+        for (const auto row : indices)
+        {
+            if (row < 0 || row >= m_data.size())
+                continue;
+            beginRemoveRows({}, row, row);
+            m_data.removeAt(row);
+            endRemoveRows();
+        }
+
+        m_status = Status::Ok;
+        emit statusChanged();
+        watcher->deleteLater();
+    });
+
+    watcher->setFuture(QtConcurrent::run([ids]() {
+        DeleteResult result;
+        result.ids = ids;
+        if (ids.isEmpty())
+            return result;
+
+        const QString connectionName = QString("license_delete_%1")
+                                           .arg(QUuid::createUuid().toString(QUuid::Id128));
+        {
+            QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", connectionName);
+            db.setDatabaseName(DB_PATH);
+            if (!db.open())
+            {
+                result.status = LicenseModel::Status::DbExistError;
+                result.error = "Database connection failed: " + db.lastError().text();
+            }
+            else
+            {
+                QStringList placeholders;
+                placeholders.reserve(ids.size());
+                for (int i = 0; i < ids.size(); ++i)
+                    placeholders << "?";
+
+                QSqlQuery query(db);
+                query.prepare(QString("DELETE FROM clients WHERE id IN (%1);")
+                                  .arg(placeholders.join(',')));
+                for (const auto &id : ids)
+                    query.addBindValue(id);
+
+                if (!query.exec())
+                {
+                    result.status = LicenseModel::Status::DbStructError;
+                    result.error = query.lastError().text();
+                }
+            }
+        }
+        QSqlDatabase::removeDatabase(connectionName);
+        return result;
+    }));
 }
 
 void LicenseModel::editClient(const LicenseItem &item, int index)
 {
+    m_status = Status::Working;
+    emit statusChanged();
+
     m_data[index] = item;
-    dataChanged(this->index(index, 0), this->index(index, COLUMN_COUNT));
+    dataChanged(this->index(index, 0), this->index(index, COLUMN_COUNT - 1));
 }
 
 void LicenseModel::updateModel()
 {
-    beginResetModel();
-    endResetModel();
+    m_status = Status::Working;
+    emit statusChanged();
+
+    auto* watcher = new QFutureWatcher<LoadResult>(this);
+    connect(watcher, &QFutureWatcher<LoadResult>::finished, this, [this, watcher]() {
+        const LoadResult result = watcher->result();
+        if (result.status != Status::Ok)
+        {
+            m_status = result.status;
+            if (!result.error.isEmpty())
+                m_errors.append(result.error);
+            emit statusChanged();
+            watcher->deleteLater();
+            return;
+        }
+
+        beginResetModel();
+        m_data = result.data;
+        endResetModel();
+
+        m_status = Status::Ok;
+        emit statusChanged();
+        watcher->deleteLater();
+    });
+
+    watcher->setFuture(QtConcurrent::run([]() {
+        LoadResult result;
+        const QString connectionName = QString("license_load_%1")
+                                           .arg(QUuid::createUuid().toString(QUuid::Id128));
+        {
+            QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", connectionName);
+            db.setDatabaseName(DB_PATH);
+            if (!db.open())
+            {
+                result.status = LicenseModel::Status::DbExistError;
+                result.error = "Database connection failed: " + db.lastError().text();
+            }
+            else
+            {
+                QSqlQuery query(db);
+                if (!query.exec(
+                        "SELECT id, lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, comment "
+                        "FROM clients ORDER BY id DESC;"
+                    ))
+                {
+                    result.status = LicenseModel::Status::DbStructError;
+                    result.error = query.lastError().text();
+                }
+                else
+                {
+                    const int createdAtUtcIndex = query.record().indexOf("createdAtUtc");
+                    while (query.next())
+                    {
+                        LicenseItem item;
+                        item.id = query.value("id").toString();
+                        item.lastName = query.value("lastName").toString();
+                        item.firstName = query.value("firstName").toString();
+                        item.patronymic = query.value("patronymic").toString();
+                        item.phone = query.value("phone").toString();
+                        item.email = query.value("email").toString();
+                        item.city = query.value("city").toString();
+                        item.yourCompany = query.value("yourCompany").toString();
+                        item.hardwareHash = query.value("hardwareHash").toString();
+                        item.comment = query.value("comment").toString();
+                        if (createdAtUtcIndex >= 0)
+                            item.createdAtUtc = query.value(createdAtUtcIndex).toString();
+                        result.data.append(item);
+                    }
+                }
+            }
+        }
+        QSqlDatabase::removeDatabase(connectionName);
+        return result;
+    }));
 }
 
 LicenseModel::LicenseItem LicenseModel::getItem(int index) const
diff --git a/src/LicenseModel/LicenseModel.h b/src/LicenseModel/LicenseModel.h
index 4a157d6..73cda99 100644
--- a/src/LicenseModel/LicenseModel.h
+++ b/src/LicenseModel/LicenseModel.h
@@ -3,6 +3,7 @@
 
 // Qt
 #include <QAbstractItemModel>
+#include <QFutureWatcher>
 #include <QtSql/QSqlDatabase>
 
 class LicenseModel : public QAbstractItemModel
@@ -16,6 +17,7 @@ public:
         Ok,
         DbStructError,
         DbExistError,
+        Working,
     };
 
     struct LicenseItem
@@ -46,10 +48,13 @@ public:
     QString getStatusText();
     bool prepareDatabase();
     void addClient(const LicenseItem &item);
-    void deleteClient(int index);
+    void deleteClient(const QList<int> &rows);
     void editClient(const LicenseItem &item, int index);
+
     void updateModel();
     LicenseItem getItem(int index) const;
+signals:
+    void statusChanged();
 private:
     bool checkTables();
 private:
diff --git a/src/MainWidget/MainWidget.cpp b/src/MainWidget/MainWidget.cpp
index a5d5533..f9281d1 100644
--- a/src/MainWidget/MainWidget.cpp
+++ b/src/MainWidget/MainWidget.cpp
@@ -9,11 +9,11 @@
 #include <QMessageBox>
 #include <QPushButton>
 #include <QSettings>
+#include <QStatusBar>
 #include <QTableView>
 #include <QTimer>
 #include <QToolBar>
 #include <QVBoxLayout>
-#include <QContextMenuEvent>
 
 // Self
 #include "../def.h"
@@ -29,7 +29,16 @@ MainWidget::MainWidget(QWidget *parent)
     setWindowIcon(QIcon(QStringLiteral("qrc:/deps/icon.png")));
     setWindowTitle("LicenseManager");
     setMinimumSize({800, 600});
-    resize({800, 600});
+    resize(minimumSize());
+
+    // Status bar
+    {
+        m_statusBar = new QStatusBar(this);
+        setStatusBar(m_statusBar);
+        m_statusLabel = new QLabel("No status", this);
+        m_statusBar->addWidget(m_statusLabel);
+        connect(m_licenseModel, &LicenseModel::statusChanged, this, &MainWidget::modelStatusChanged);
+    }
 
     // Model init
     {
@@ -100,6 +109,7 @@ MainWidget::MainWidget(QWidget *parent)
 
     m_tableView->resizeColumnsToContents();
     selectionChanged({}, {});
+    modelStatusChanged();
     loadSettings();
 }
 
@@ -170,8 +180,11 @@ void MainWidget::onDeleteClientTriggered()
     if (selectedRows.isEmpty())
         return;
 
-    for (auto i = selectedRows.size() - 1; i >= 0; i--)
-        m_licenseModel->deleteClient(selectedRows[i].row());
+    QList<int> list;
+    for (auto i = selectedRows.size() - 1; i >= 0; --i)
+        list << selectedRows.at(i).row();
+
+    m_licenseModel->deleteClient(list);
 }
 
 void MainWidget::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
@@ -231,3 +244,31 @@ void MainWidget::onEditClientDialogClosed(int result)
         break;
     }
 }
+
+void MainWidget::modelStatusChanged()
+{
+    switch (m_licenseModel->getStatus())
+    {
+    case LicenseModel::Status::Ok:
+        m_statusLabel->setText(tr("Database ready"));
+        break;
+    case LicenseModel::Status::DbExistError:
+        m_statusLabel->setText(tr("Database exist error"));
+        break;
+    case LicenseModel::Status::DbStructError:
+        m_statusLabel->setText(tr("Database struct error"));
+        break;
+    case LicenseModel::Status::Working:
+        m_statusLabel->setText(tr("Working"));
+        break;
+    default:
+        m_statusLabel->setText(tr("Unknown status"));
+        break;
+    }
+
+    m_addClientToolBarAction->setEnabled(m_licenseModel->getStatus() == LicenseModel::Status::Ok);
+    m_addClientsMenuAction->setEnabled(m_licenseModel->getStatus() == LicenseModel::Status::Ok);
+    m_editClientsMenuAction->setEnabled(m_licenseModel->getStatus() == LicenseModel::Status::Ok);
+    m_deleteClientsMenuAction->setEnabled(m_licenseModel->getStatus() == LicenseModel::Status::Ok);
+}
+
diff --git a/src/MainWidget/MainWidget.h b/src/MainWidget/MainWidget.h
index de75cc0..f68298f 100644
--- a/src/MainWidget/MainWidget.h
+++ b/src/MainWidget/MainWidget.h
@@ -4,13 +4,15 @@
 // Qt
 #include <QMainWindow>
 #include <QItemSelection>
-class QTableView;
-class QMenu;
 class QAction;
+class QLabel;
+class QMenu;
+class QStatusBar;
+class QTableView;
 
 // Self
+#include "LicenseModel/LicenseModel.h"
 class EditClientDialog;
-class LicenseModel;
 
 class MainWidget : public QMainWindow
 {
@@ -31,7 +33,7 @@ private slots:
     void onDeleteClientTriggered();
     void onEditClientDialogClosed(int result);
     void selectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
-
+    void modelStatusChanged();
 private:
     void saveSettings();
     void loadSettings();
@@ -48,6 +50,8 @@ private:
     QAction* m_deleteClientsMenuAction{nullptr};
     QAction* m_editClientsMenuAction{nullptr};
     EditClientDialog* m_editClientDialog{nullptr};
+    QStatusBar* m_statusBar{nullptr};
+    QLabel* m_statusLabel{nullptr};
 };
 
 #endif // LICENSEMANAGER_MAINWIDGET_H