diff --git a/src/colnod/colnodapi.cpp b/src/colnod/colnodapi.cpp
index 7946161..dfeab3c 100644
--- a/src/colnod/colnodapi.cpp
+++ b/src/colnod/colnodapi.cpp
@@ -31,14 +31,14 @@ void ColnodAPI::downloadData(const qint64 &time)
             return;
         }
         AuthToken token;
-        auto responseData = login->responseData();
-        if (responseData.isEmpty()) {
+
+        if (checkResponse(login->responseData())) {
             qCWarning(colnod) << "empty response data when logging in";
             emit downloadDataFinished(nullptr);
             return;
         }
 
-        token.fromJson(responseData);
+        token.fromJson(login->responseData());
         authToken = token.id();
         if (authToken.isEmpty()) {
             qCCritical(colnod) << "Token uuid is empty";
@@ -52,11 +52,12 @@ void ColnodAPI::downloadData(const qint64 &time)
             if (!checkRequest(request)) {
                 qWarning(colnod) << "ERROR during calling" << request->url() << ", request unsuccessful";
                 mValid = false;
-                emit downloadDataFinished(nullptr);  // TODO: think about it, will the other if passed?
+                emit downloadDataFinished(nullptr);
             }
             else if (!checkResponse(request->responseData())) {
                 qWarning(colnod) << "Data from" << request->url() << "are invalid";
                 mValid = false;
+                emit downloadDataFinished(nullptr);
             }
         };
 
@@ -99,12 +100,6 @@ void ColnodAPI::downloadData(const qint64 &time)
 
 void ColnodAPI::processData(const std::shared_ptr<Data> &data)
 {
-    for (const auto &token : data->updatedTokens) {
-        qInfo(colnod).noquote() << Message::massageTemplate("Updating", "token", "colnod", token->name());
-    }
-    for (const auto &id : data->deletedTokens) {
-        qInfo(colnod).noquote() << Message::massageTemplate("Deleting", "token", "colnod", id);
-    }
     if (!data->updatedTokens.isEmpty() || !data->deletedTokens.isEmpty()) {
         qInfo(colnod) << dash;
     }
@@ -188,15 +183,18 @@ std::shared_ptr<serversdk::Request> ColnodAPI::setTokens(const QHash<QString, st
     connect(request.get(),  &serversdk::Request::finished, [=](){
         if (!checkRequest(request)) {
             qCritical(colnod) << "ERROR during calling /TokenManager/setTokens, request unsuccessful. EXIT";
-            emit error();  // TODO: retyrn nullptr and check here
         }
         if (checkResponse(request->responseData())) {
+
+            for (const auto &token : tokens) {
+                qInfo(colnod).noquote() << Message::massageTemplate("Updating", "token", "colnod", token->name());
+            }
             emit partOfDataProcessFinished();
         }
         else {
             qWarning(colnod) << "Tokens wasn't updated";
             mValid = false;
-            emit partOfDataProcessFinished();
+            emit partOfDataProcessFinished(false);
         }
     });
     return request;
@@ -210,15 +208,17 @@ std::shared_ptr<serversdk::Request> ColnodAPI::deleteTokens(const QList<QString>
     connect(request.get(),  &serversdk::Request::finished, [=](){
         if (!checkRequest(request)) {
             qCritical(colnod) << "ERROR during calling /TokenManager/deleteTokens, request unsuccessful. EXIT";
-            emit error(); // TODO: return nullptr and check it
         }
         if (checkResponse(request->responseData())) {
+            for (const auto &id : ids) {
+                qInfo(colnod).noquote() << Message::massageTemplate("Deleting", "token", "colnod", id);
+            }
             emit partOfDataProcessFinished();
         }
         else {
             qWarning(colnod) << "Tokens wasn't deleted";
             mValid = false;
-            emit partOfDataProcessFinished();
+            emit partOfDataProcessFinished(false);
         }
     });
     return request;
@@ -276,10 +276,13 @@ void ColnodAPI::areDataReady(const std::shared_ptr<Data> &data)
     }
 }
 
-void ColnodAPI::isDataProcessFinished()
+void ColnodAPI::isDataProcessFinished(bool success)
 {
+    if (!success) {
+        mSuccess = false;
+    }
     if (++amountProccessesFinished == 2) {
-        emit dataProcessFinished();
+        emit dataProcessFinished(mSuccess);
     }
 }
 
diff --git a/src/colnod/colnodapi.h b/src/colnod/colnodapi.h
index 7d87e79..5c11a3b 100644
--- a/src/colnod/colnodapi.h
+++ b/src/colnod/colnodapi.h
@@ -66,7 +66,7 @@ public:
 
 private:
     Q_SLOT void areDataReady(const std::shared_ptr<Data>& data);
-    Q_SLOT void isDataProcessFinished();
+    Q_SLOT void isDataProcessFinished(bool success);
 
 private:
     void saveUpdatedTokens(const std::shared_ptr<Data>& data, const QByteArray &responseData);
@@ -84,8 +84,8 @@ private:
 signals:
     void downloadDataFinished(std::shared_ptr<Data> = std::shared_ptr<Data>());
     void partOfDataReady(std::shared_ptr<Data> = std::shared_ptr<Data>());
-    void partOfDataProcessFinished();
-    void dataProcessFinished();
+    void partOfDataProcessFinished(bool success = true);
+    void dataProcessFinished(bool success = true);
 
     void error();
 
@@ -97,6 +97,7 @@ private:
     Timestamp mLastSync;
     bool mDryMode = false;
     bool mValid = true;
+    bool mSuccess = true;
 
     QString authToken;
     qint16 amountData = 0;
diff --git a/src/colnod/data.h b/src/colnod/data.h
index 868bc03..5ab4d8f 100644
--- a/src/colnod/data.h
+++ b/src/colnod/data.h
@@ -44,7 +44,7 @@ struct PreparedData
 public:
     PreparedData() = default;
     PreparedData(const std::shared_ptr<Data> &database, const std::shared_ptr<Data> &colnod)
-        :databaseData(std::move(database)), colnodData(std::move(colnod))
+        :databaseData(database), colnodData(colnod)
     {
     }
 
diff --git a/src/colnod/databaseapi.cpp b/src/colnod/databaseapi.cpp
index 039b135..3ba87b6 100644
--- a/src/colnod/databaseapi.cpp
+++ b/src/colnod/databaseapi.cpp
@@ -46,17 +46,23 @@ std::shared_ptr<Data> DatabaseAPI::downloadData()
     }
 
     return composeData(updatedQuery, deletedQuery);
-    // TODO: why emiting signal??
-    // this can return Strucutre
-    //emit downloadDataFinished(composeData(updatedQuery, deletedQuery));
 }
 
 bool DatabaseAPI::processData(const std::shared_ptr<Data> &data)
-{     
-    uploadTokens(data->updatedTokens);
-    uploadSubjects(data->updatedSubjects);
-    deleteItems(data->deletedTokens, "colnod_token");
-    deleteItems(data->deletedSubjects, "colnod_subject");
+{
+    bool res = true;
+    if (!uploadTokens(data->updatedTokens)) {
+        res = false;
+    }
+    if (uploadSubjects(data->updatedSubjects)) {
+        res = false;
+    }
+    if (deleteItems(data->deletedTokens, "colnod_token")) {
+        res = false;
+    }
+    if (deleteItems(data->deletedSubjects, "colnod_subject")) {
+        res = false;
+    }
     if ( !data->updatedTokens.isEmpty() ||
          !data->updatedSubjects.isEmpty() ||
          !data->deletedTokens.isEmpty() ||
@@ -70,8 +76,7 @@ bool DatabaseAPI::processData(const std::shared_ptr<Data> &data)
     qInfo(database) << tab << tab << data->deletedSubjects.size() << "SUBJECTS DELETED";
     qInfo(database) << dash;
 
-    // TODO: add error handling
-    return true;
+    return res;
 }
 
 
@@ -222,6 +227,7 @@ bool DatabaseAPI::deleteItems(const QList<QString> &ids, const QString &tableNam
         query.bindValue(":now", nowString);
         if (!executeQuery(query)) {
             qWarning(database) << "ERROR during marking token as deleted:" << id;
+            mValid = false;
             return false;
         }
     }
@@ -235,7 +241,6 @@ std::shared_ptr<Token> DatabaseAPI::getToken(const QString &id)
     query.bindValue(":id", id);
     if (!executeQuery(query)) {
         qCritical(database) << "ERROR during accessing existing tokens. EXIT";
-        emit error();
         return nullptr;
     }
     auto list = utils->tableFromQuery<Token>(query);
diff --git a/src/colnod/subject.h b/src/colnod/subject.h
index 9f17fd0..6287ae4 100644
--- a/src/colnod/subject.h
+++ b/src/colnod/subject.h
@@ -13,7 +13,6 @@ class SubjectAttribute : public serversdk::DatabaseTable {
     TABLE_PROPERTY(QString, subjectId, setSubjectId, "")
 };
 
-
 class Subject : public serversdk::DatabaseTable {
     Q_OBJECT
     TABLE_PROPERTY(QString, id, setId, QString())
@@ -24,7 +23,6 @@ class Subject : public serversdk::DatabaseTable {
     TABLE_PROPERTY(QDateTime, lastModified, setLastModified, QDateTime())
     TABLE_PROPERTY(bool, deleted, setDeleted, false)
 
-
 public:
     Subject() = default;
     explicit Subject(const QString& name);
@@ -32,7 +30,6 @@ public:
     bool fromJson(const QByteArray &data) override;
     QList<std::shared_ptr <SubjectAttribute>> getAttributes();
 
-
 private:
     QList<std::shared_ptr <SubjectAttribute>> attributes;
 };
diff --git a/src/colnod/syncmanager.cpp b/src/colnod/syncmanager.cpp
index 342d1ab..bc6eba8 100644
--- a/src/colnod/syncmanager.cpp
+++ b/src/colnod/syncmanager.cpp
@@ -60,7 +60,7 @@ bool SyncManager::startSynchronization()
     // NOW I HAVE DATA FROM DATABASE
 
     colnod->downloadData(mlastSync.timestamp());
-    connect(colnod.get(), &ColnodAPI::downloadDataFinished, [=](std::shared_ptr<Data> colnodData) {
+    connect(colnod.get(), &ColnodAPI::downloadDataFinished, [=](const std::shared_ptr<Data> &colnodData) {
         if (!colnodData) {
             qCritical(syncmanager) << "Not possible to get correct data from colnod";
             QCoreApplication::exit(-1);
@@ -90,7 +90,7 @@ bool SyncManager::startSynchronization()
         }
 
         // data is processed to other sides
-        connect(colnod.get(), &ColnodAPI::dataProcessFinished, [&](bool success){
+        connect(colnod.get(), &ColnodAPI::dataProcessFinished, [&,syncBegin](bool success){
             if (!success) {
                 qCritical(syncmanager) << "Not possible to upload data to colnod";
             }
diff --git a/src/colnod/syncmanager.h b/src/colnod/syncmanager.h
index 2bc2f3e..5053dee 100644
--- a/src/colnod/syncmanager.h
+++ b/src/colnod/syncmanager.h
@@ -31,13 +31,6 @@ private:
 private:
     void initNewToken(const std::shared_ptr<Token>& token);
 
-    void updateLastUpdate(qint64 syncBegin);
-
-signals:
-    void syncFinished();
-
-    void error();
-
 private:
     std::shared_ptr<ColnodAPI> colnod;
     std::shared_ptr<DatabaseAPI> database;
diff --git a/src/colnod/token.cpp b/src/colnod/token.cpp
index 6e0acd0..4346efa 100644
--- a/src/colnod/token.cpp
+++ b/src/colnod/token.cpp
@@ -45,6 +45,7 @@ QByteArray Token::jsonData(const QSet<QString> &filters) const
     QJsonDocument doc = QJsonDocument::fromVariant(variantMap);
     return doc.toJson(QJsonDocument::Compact);
 }
+
 bool Token::fromJson(const QByteArray &data)
 {
     QJsonDocument doc = QJsonDocument::fromJson(data);
@@ -81,24 +82,3 @@ QByteArray Token::idsToJSON(const QList<QString> &ids)
     doc.setObject(items);
     return doc.toJson();
 }
-
-
-void Token::fromSQLRecord(const QSqlQuery& query)
-{
-    setId(query.value(0).toString());
-    a_authErrors = query.value(1).toInt();
-    setDescription(query.value(2).toString());
-    setNoValidity(query.value(6).toBool());
-    setEnabled(query.value(3).toBool());
-    QDateTime date = query.value(4).toDateTime();
-    setLastUpdate(date);
-    setName(query.value(5).toString());
-    a_timeToLive = query.value(7).toInt();
-    a_tokenBits = query.value(8).toInt();
-    a_tokenData = query.value(9).toString();
-    a_tokenType = query.value(10).toString();
-    a_subjectId = query.value(11).toString();
-    date = query.value(12).toDateTime();
-    setLastModified(date);
-    setDeleted(query.value(13).toBool());
-}
diff --git a/src/colnod/token.h b/src/colnod/token.h
index db19737..f3e4edd 100644
--- a/src/colnod/token.h
+++ b/src/colnod/token.h
@@ -65,8 +65,6 @@ public:
                 lToken->subjectId() == rToken->subjectId();
     }
 
-    void fromSQLRecord(const QSqlQuery& query);
-
     static QByteArray tokensToColnodJson(const QHash<QString, std::shared_ptr<Token> > &tokens);
     static QByteArray idsToJSON(const QList<QString> &ids);