diff --git a/src/EditClientDialog/EditClientDialog.cpp b/src/EditClientDialog/EditClientDialog.cpp
index 4835a47..0085e00 100644
--- a/src/EditClientDialog/EditClientDialog.cpp
+++ b/src/EditClientDialog/EditClientDialog.cpp
@@ -229,4 +229,6 @@ void EditClientDialog::setClientInfo(int index)
     m_cityLineEdit->setText(item.city);
     m_yourCompanyNameTextEdit->setText(item.yourCompany);
     m_hardwareHashLineEdit->setText(item.hardwareHash);
+
+    m_configPathLabel->setText(tr("Drop file here"));
 }
diff --git a/src/LicenseModel/LicenseModel.cpp b/src/LicenseModel/LicenseModel.cpp
index 8b98657..fb87809 100644
--- a/src/LicenseModel/LicenseModel.cpp
+++ b/src/LicenseModel/LicenseModel.cpp
@@ -11,58 +11,14 @@
 #include <QtSql/QSqlRecord>
 
 // Self
-#include <qfile.h>
-
 #include "../def.h"
 
-const static int COLUMN_COUNT = 9;
-
-namespace {
-struct LoadResult
-{
-    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;
-};
-}
+const static int COLUMN_COUNT = 8;
 
 LicenseModel::LicenseModel(QObject* parent)
     : QAbstractItemModel(parent)
 {
-    m_db = QSqlDatabase::addDatabase("QSQLITE");
-    m_db.setDatabaseName(DB_PATH);
-
-    if (!m_db.open())
-    {
-        m_status = Status::DbExistError;
-        m_errors.append("Database connection failed: " + m_db.lastError().text());
-    }
-    else
-    {
-        if (!checkTables())
-        {
-            m_status = Status::DbStructError;
-            m_errors.append("Database tables are not valid");
-        }
-        else
-        {
-            m_status = Status::Ok;
-        }
-    }
-
-    if (m_db.open())
-        m_db.close();
-}
-
-LicenseModel::~LicenseModel()
-{
+    checkTables();
 }
 
 int LicenseModel::rowCount(const QModelIndex &parent) const
@@ -103,8 +59,6 @@ QVariant LicenseModel::data(const QModelIndex &index, int role) const
     case 6:
         return m_data[index.row()].city ;
     case 7:
-        return m_data[index.row()].createdAtUtc ;
-    case 8:
         return m_data[index.row()].comment ;
     default:
         return {};
@@ -136,8 +90,6 @@ QVariant LicenseModel::headerData(int section, Qt::Orientation orientation, int
     case 6:
         return tr("City");
     case 7:
-        return tr("Created date");
-    case 8:
         return tr("Comment");
     default:
         return {};
@@ -173,20 +125,52 @@ QString LicenseModel::getStatusText()
 
 bool LicenseModel::checkTables()
 {
+    auto db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName(DB_PATH);
+
+    if (!db.open())
+    {
+        m_status = Status::DbExistError;
+        m_errors.append("Database connection failed: " + db.lastError().text());
+        return false;
+    }
+
     bool clientTableExist = false;
-    for (const auto &table : m_db.tables())
+    for (const auto &table : db.tables())
     {
         if (table == "clients")
+        {
+            m_status = Status::Ok;
             return true;
+        }
     }
+
+    db.close();
+
     if (!clientTableExist)
+    {
+        m_status = Status::DbStructError;
         return false;
+    }
     else
+    {
+        m_status = Status::Ok;
         return true;
+    }
 }
 
 bool LicenseModel::prepareDatabase()
 {
+    auto db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName(DB_PATH);
+
+    if (!db.open())
+    {
+        m_status = Status::DbExistError;
+        m_errors << tr("Database not exist");
+        return false;
+    }
+
     QFile tablesFile(QStringLiteral(":/deps/tables.ddl"));
     if (!tablesFile.open(QIODevice::ReadOnly | QIODevice::Text))
         return false;
@@ -198,7 +182,7 @@ bool LicenseModel::prepareDatabase()
     {
         if (item.trimmed().isEmpty())
             continue;
-        QSqlQuery query(m_db);
+        QSqlQuery query(db);
         if (!query.exec(item.trimmed()))
         {
             m_status = Status::DbStructError;
@@ -208,6 +192,9 @@ bool LicenseModel::prepareDatabase()
         }
     }
 
+    db.close();
+
+    m_status = Status::Ok;
     return true;
 }
 
@@ -216,12 +203,31 @@ void LicenseModel::addClient(const LicenseItem &item)
     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();
+    auto* watcher = new QFutureWatcher<Result>(this);
+    connect(watcher, &QFutureWatcher<Result>::finished, this, [this, watcher]() {
+        const Result 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;
+        }
+
+        if (result.data.isEmpty())
+        {
+            m_status = Status::DbStructError;
+            m_errors.append("Inserted client not found");
+            emit statusChanged();
+            watcher->deleteLater();
+            return;
+        }
+
+        const int row = 0;
         beginInsertRows({}, row, row);
-        m_data.append(watcher->result());
+        m_data.insert(row, result.data.first());
         endInsertRows();
 
         m_status = Status::Ok;
@@ -230,16 +236,17 @@ void LicenseModel::addClient(const LicenseItem &item)
         watcher->deleteLater();
     });
 
-    // another thread lambda
     watcher->setFuture(QtConcurrent::run([item]() {
+        Result result;
         const QString connectionName = QString("license_add_%1").arg(QUuid::createUuid().toString(QUuid::Id128));
-        LicenseItem output;
-        bool ok = false;
         {
-            auto db = QSqlDatabase::addDatabase("QSQLITE", connectionName);
+            QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE", connectionName);
             db.setDatabaseName(DB_PATH);
             if (!db.open())
-                qDebug() << "db not open";
+            {
+                result.status = LicenseModel::Status::DbExistError;
+                result.error = "Database connection failed: " + db.lastError().text();
+            }
             else
             {
                 QSqlQuery queryInsert(db);
@@ -258,21 +265,31 @@ void LicenseModel::addClient(const LicenseItem &item)
                 queryInsert.bindValue(":comment", item.comment);
 
                 if (!queryInsert.exec())
-                    qDebug() << "queryInsert error" << queryInsert.lastError();
+                {
+                    result.status = LicenseModel::Status::DbStructError;
+                    result.error = queryInsert.lastError().text();
+                }
                 else
                 {
-                    QString itemId = QString::number(queryInsert.lastInsertId().toLongLong());
+                    const 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();
+                    {
+                        result.status = LicenseModel::Status::DbStructError;
+                        result.error = querySelect.lastError().text();
+                    }
                     else if (!querySelect.next())
-                        qDebug() << "querySelect no rows for id" << itemId;
+                    {
+                        result.status = LicenseModel::Status::DbStructError;
+                        result.error = "Inserted client not found: " + itemId;
+                    }
                     else
                     {
+                        LicenseItem output;
                         output.id = itemId;
                         output.lastName = querySelect.value("lastName").toString();
                         output.firstName = querySelect.value("firstName").toString();
@@ -283,15 +300,16 @@ void LicenseModel::addClient(const LicenseItem &item)
                         output.yourCompany = querySelect.value("yourCompany").toString();
                         output.hardwareHash = querySelect.value("hardwareHash").toString();
                         output.comment = querySelect.value("comment").toString();
-                        ok = true;
+                        const int createdAtUtcIndex = querySelect.record().indexOf("createdAtUtc");
+                        if (createdAtUtcIndex >= 0)
+                            output.createdAtUtc = querySelect.value(createdAtUtcIndex).toString();
+                        result.data.append(output);
                     }
                 }
             }
         }
         QSqlDatabase::removeDatabase(connectionName);
-        if (!ok)
-            return LicenseItem();
-        return output;
+        return result;
     }));
 }
 
@@ -311,9 +329,9 @@ void LicenseModel::deleteClient(const QList<int> &rows)
             ids.append(id);
     }
 
-    auto* watcher = new QFutureWatcher<DeleteResult>(this);
-    connect(watcher, &QFutureWatcher<DeleteResult>::finished, this, [this, watcher]() {
-        const DeleteResult result = watcher->result();
+    auto* watcher = new QFutureWatcher<Result>(this);
+    connect(watcher, &QFutureWatcher<Result>::finished, this, [this, watcher]() {
+        const Result result = watcher->result();
         if (result.status != Status::Ok)
         {
             m_status = result.status;
@@ -354,7 +372,7 @@ void LicenseModel::deleteClient(const QList<int> &rows)
     });
 
     watcher->setFuture(QtConcurrent::run([ids]() {
-        DeleteResult result;
+        Result result;
         result.ids = ids;
         if (ids.isEmpty())
             return result;
@@ -399,8 +417,141 @@ 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 - 1));
+    if (index < 0 || index >= m_data.size())
+    {
+        m_status = Status::Ok;
+        emit statusChanged();
+        return;
+    }
+
+    LicenseItem updateItem = item;
+    updateItem.id = m_data[index].id;
+    if (updateItem.createdAtUtc.isEmpty())
+        updateItem.createdAtUtc = m_data[index].createdAtUtc;
+
+    if (updateItem.id.isEmpty())
+    {
+        m_status = Status::DbStructError;
+        m_errors.append("Client id is empty");
+        emit statusChanged();
+        return;
+    }
+
+    auto* watcher = new QFutureWatcher<Result>(this);
+    connect(watcher, &QFutureWatcher<Result>::finished, this, [this, watcher, index]() {
+        const Result 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;
+        }
+
+        if (result.data.isEmpty())
+        {
+            m_status = Status::DbStructError;
+            m_errors.append("Updated client not found");
+            emit statusChanged();
+            watcher->deleteLater();
+            return;
+        }
+
+        if (index < 0 || index >= m_data.size())
+        {
+            m_status = Status::Ok;
+            emit statusChanged();
+            watcher->deleteLater();
+            return;
+        }
+
+        m_data[index] = result.data.first();
+        dataChanged(this->index(index, 0), this->index(index, COLUMN_COUNT - 1));
+
+        m_status = Status::Ok;
+        emit statusChanged();
+        watcher->deleteLater();
+    });
+
+    watcher->setFuture(QtConcurrent::run([updateItem]() {
+        Result result;
+        const QString connectionName = QString("license_edit_%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 queryUpdate(db);
+                queryUpdate.prepare(QString(
+                    "UPDATE clients SET lastName=:lastName, firstName=:firstName, patronymic=:patronymic, "
+                    "phone=:phone, email=:email, city=:city, yourCompany=:yourCompany, hardwareHash=:hardwareHash, "
+                    "comment=:comment WHERE id=:id;"
+                ));
+                queryUpdate.bindValue(":lastName", updateItem.lastName);
+                queryUpdate.bindValue(":firstName", updateItem.firstName);
+                queryUpdate.bindValue(":patronymic", updateItem.patronymic);
+                queryUpdate.bindValue(":phone", updateItem.phone);
+                queryUpdate.bindValue(":email", updateItem.email);
+                queryUpdate.bindValue(":city", updateItem.city);
+                queryUpdate.bindValue(":yourCompany", updateItem.yourCompany);
+                queryUpdate.bindValue(":hardwareHash", updateItem.hardwareHash);
+                queryUpdate.bindValue(":comment", updateItem.comment);
+                queryUpdate.bindValue(":id", updateItem.id);
+
+                if (!queryUpdate.exec())
+                {
+                    result.status = LicenseModel::Status::DbStructError;
+                    result.error = queryUpdate.lastError().text();
+                }
+                else
+                {
+                    QSqlQuery querySelect(db);
+                    querySelect.prepare(QString("SELECT * FROM clients WHERE id=:id;"));
+                    querySelect.bindValue(":id", updateItem.id);
+
+                    if (!querySelect.exec())
+                    {
+                        result.status = LicenseModel::Status::DbStructError;
+                        result.error = querySelect.lastError().text();
+                    }
+                    else if (!querySelect.next())
+                    {
+                        result.status = LicenseModel::Status::DbStructError;
+                        result.error = "Updated client not found: " + updateItem.id;
+                    }
+                    else
+                    {
+                        LicenseItem output;
+                        output.id = updateItem.id;
+                        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();
+                        const int createdAtUtcIndex = querySelect.record().indexOf("createdAtUtc");
+                        if (createdAtUtcIndex >= 0)
+                            output.createdAtUtc = querySelect.value(createdAtUtcIndex).toString();
+                        else
+                            output.createdAtUtc = updateItem.createdAtUtc;
+                        result.data.append(output);
+                    }
+                }
+            }
+        }
+        QSqlDatabase::removeDatabase(connectionName);
+        return result;
+    }));
 }
 
 void LicenseModel::updateModel()
@@ -408,9 +559,9 @@ void LicenseModel::updateModel()
     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();
+    auto* watcher = new QFutureWatcher<Result>(this);
+    connect(watcher, &QFutureWatcher<Result>::finished, this, [this, watcher]() {
+        const Result result = watcher->result();
         if (result.status != Status::Ok)
         {
             m_status = result.status;
@@ -431,7 +582,7 @@ void LicenseModel::updateModel()
     });
 
     watcher->setFuture(QtConcurrent::run([]() {
-        LoadResult result;
+        Result result;
         const QString connectionName = QString("license_load_%1")
                                            .arg(QUuid::createUuid().toString(QUuid::Id128));
         {
diff --git a/src/LicenseModel/LicenseModel.h b/src/LicenseModel/LicenseModel.h
index 73cda99..f29f0dd 100644
--- a/src/LicenseModel/LicenseModel.h
+++ b/src/LicenseModel/LicenseModel.h
@@ -35,8 +35,15 @@ public:
         QString comment;
     };
 
+    struct Result
+    {
+        QList<LicenseItem> data;
+        QStringList ids;
+        Status status = Status::Ok;
+        QString error;
+    };
+
     explicit LicenseModel(QObject* parent = nullptr);
-    ~LicenseModel();
 
     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
     int columnCount(const QModelIndex &parent = QModelIndex()) const override;
@@ -61,7 +68,6 @@ private:
     QList<LicenseItem> m_data;
     Status m_status = Status::None;
     QStringList m_errors;
-    QSqlDatabase m_db;
 };
 
 #endif // LICENSEMANAGER_LICENSEMODEL_H
diff --git a/src/MainWidget/MainWidget.cpp b/src/MainWidget/MainWidget.cpp
index f9281d1..9c59b4b 100644
--- a/src/MainWidget/MainWidget.cpp
+++ b/src/MainWidget/MainWidget.cpp
@@ -184,7 +184,14 @@ void MainWidget::onDeleteClientTriggered()
     for (auto i = selectedRows.size() - 1; i >= 0; --i)
         list << selectedRows.at(i).row();
 
-    m_licenseModel->deleteClient(list);
+    auto result = QMessageBox::question(
+        this,
+        tr("Delete rows"),
+        tr(QString("Do you want to delete %1 rows?").arg(list.size()).toUtf8())
+    );
+
+    if (result == QMessageBox::Yes)
+        m_licenseModel->deleteClient(list);
 }
 
 void MainWidget::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)