diff --git a/src/colnod/colnodapi.cpp b/src/colnod/colnodapi.cpp
index 5cd1f28..eadb3b9 100644
--- a/src/colnod/colnodapi.cpp
+++ b/src/colnod/colnodapi.cpp
@@ -39,7 +39,15 @@ void ColnodAPI::downloadData()
 
 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;
+    }
     qInfo(colnod) << tab << "-> DATA PROCESSED TO COLNOD:";
     qInfo(colnod) << tab << tab << data->updatedTokens.size() << "TOKENS UPDATED";
     qInfo(colnod) << tab << tab << data->deletedTokens.size() << "TOKENS DELETED";
diff --git a/src/colnod/databaseapi.cpp b/src/colnod/databaseapi.cpp
index 916dc86..53d7972 100644
--- a/src/colnod/databaseapi.cpp
+++ b/src/colnod/databaseapi.cpp
@@ -38,6 +38,7 @@ bool DatabaseAPI::executeQuery(QSqlQuery &query, const QString &statement)
 
 std::shared_ptr<Data> DatabaseAPI::downloadData()
 {
+    bool res = true;
     auto updatedQuery = mDbMan->createQuery();
     auto deletedQuery = mDbMan->createQuery();
     if (!executeQuery(updatedQuery, "SELECT * FROM colnod_token WHERE last_modified > last_update AND deleted = false")) {
@@ -55,13 +56,18 @@ std::shared_ptr<Data> DatabaseAPI::downloadData()
     //emit downloadDataFinished(composeData(updatedQuery, deletedQuery));
 }
 
-void DatabaseAPI::processData(const std::shared_ptr<Data> &data)
+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");
-
+    if ( !data->updatedTokens.isEmpty() ||
+         !data->updatedSubjects.isEmpty() ||
+         !data->deletedTokens.isEmpty() ||
+         !data->deletedSubjects.isEmpty()) {
+         qInfo(database) << dash;
+    }
     qInfo(database) << tab << "-> DATA PROCESSED TO DATABASE:";
     qInfo(database) << tab << tab << data->updatedTokens.size() << "TOKENS ADDED/UPDATED";
     qInfo(database) << tab << tab << data->deletedTokens.size() << "TOKENS DELETED";
@@ -155,6 +161,8 @@ qint64 DatabaseAPI::getNow()
         return -1;
     }
     query.next();
+    qDebug() << "Database time:" << QDateTime::fromMSecsSinceEpoch(query.value(0).toLongLong()).toString("yyyy-MM-dd hh:mm:ss.zzz");
+    qDebug() << "Current time:" << QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss.zzz");
     return query.value(0).toLongLong();
 }
 
@@ -178,7 +186,7 @@ void DatabaseAPI::initNewTokens()
     uploadTokens(tokensToInit);
 }
 
-void DatabaseAPI::uploadTokens(const QHash<QString, std::shared_ptr<Token>> &tokens)
+bool DatabaseAPI::uploadTokens(const QHash<QString, std::shared_ptr<Token>> &tokens)
 {
     // TODO: first check if OK, then message
     // OK -> token was updated
@@ -209,11 +217,13 @@ void DatabaseAPI::uploadTokens(const QHash<QString, std::shared_ptr<Token>> &tok
         if (!query.isActive()) {
             mValid = false;
             qWarning(database) << "ERROR durning inserting/updating of token:" << token->name();
+            return false;
         }
     }
+    return true;
 }
 
-void DatabaseAPI::uploadSubjects(const QHash<QString, std::shared_ptr<Subject>> &subjects)
+bool DatabaseAPI::uploadSubjects(const QHash<QString, std::shared_ptr<Subject>> &subjects)
 {
     auto query = mDbMan->createQuery();
     for (const auto &subject : subjects) {
@@ -241,11 +251,13 @@ void DatabaseAPI::uploadSubjects(const QHash<QString, std::shared_ptr<Subject>>
         if (!query.isActive()) {
             mValid = false;
             qWarning(database) << "ERROR durning inserting/updating of subject attribute:" << subject->name();
+            return false;
         }
     }
+    return true;
 }
 
-void DatabaseAPI::deleteItems(const QList<QString> &ids, const QString &tableName)
+bool DatabaseAPI::deleteItems(const QList<QString> &ids, const QString &tableName)
 {
     auto query = mDbMan->createQuery();
     QString nowString = QDateTime::fromMSecsSinceEpoch(getLastSync()).toString("yyyy-MM-dd hh:mm:ss.zzz");
@@ -257,18 +269,21 @@ void 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;
+            return false;
         }
     }
+    return true;
 }
 
 std::shared_ptr<Token> DatabaseAPI::getToken(const QString &id)
 {
     auto query = mDbMan->createQuery();
-    query.prepare("SELECT * FROM colnod_token WHERE id = :id");
+    query.prepare("SELECT * FROM colnod_token WHERE d = :id");
     query.bindValue(":id", id);
     if (!executeQuery(query)) {
-        qCritical(database) << "ERROR during accessing existing tokens";
+        qCritical(database) << "ERROR during accessing existing tokens. EXIT";
         emit error();
+        return nullptr;
     }
     auto list = utils->tableFromQuery<Token>(query);
     if (list.isEmpty())
@@ -280,6 +295,9 @@ bool DatabaseAPI::isAlreadyDeleted(const QString &id)
 {
     auto token = getToken(id);
     if (!token) {
+        if (id.isEmpty()) {
+
+        }
         qWarning(database) << "Token deleted in colnod doesn't exists in db, will be noted as already deleted in stats";
         return true;
     }
@@ -294,15 +312,14 @@ bool DatabaseAPI::isValid()
     return mValid;
 }
 
-
-bool DatabaseAPI::exists(const QString &id, const QString &tableName)
+int DatabaseAPI::exists(const QString &id, const QString &tableName)
 {
     auto query = mDbMan->createQuery();
     query.prepare(QString("SELECT 1 FROM %1 WHERE id = :id").arg(tableName));
     query.bindValue(":id", id);
     if (!executeQuery(query)) {
         qCritical(database) << "ERROR during accessing existing tokens. EXIT(1)";
-        emit error();
+        return -1;
     }
     return query.next();
 }
@@ -314,7 +331,7 @@ qint16 DatabaseAPI::getNumOfTokensOfSubject(const QString &id)
     query.bindValue(":id", id);
     if (!executeQuery(query)) {
         qCritical(database) << "ERROR during accessing existing tokens. EXIT(1)";
-        emit error();
+        return -1;
     }
     return static_cast<qint16>(query.size());
 }
@@ -326,7 +343,7 @@ QString DatabaseAPI::getSubjectNameByTokenId(const QString &tokenId)
     query.bindValue(":tokenId", tokenId);
     if (!executeQuery(query)) {
         qCritical(database) << "ERROR during accessing existing subject. EXIT(1)";
-        emit error();
+        return "error";
     }
     if (query.next())
         return query.value(0).toString();
diff --git a/src/colnod/databaseapi.h b/src/colnod/databaseapi.h
index 93c82dd..a9a18b2 100644
--- a/src/colnod/databaseapi.h
+++ b/src/colnod/databaseapi.h
@@ -8,6 +8,7 @@
 #include "serversdk/databasetable.h"
 #include "serversdk/databaseutils.h"
 #include "serversdk/logger.h"
+#include <QCoreApplication>
 
 Q_DECLARE_LOGGING_CATEGORY(database)
 
@@ -34,9 +35,9 @@ public:
     void initNewTokens();
 
     // process data
-    void uploadTokens(const QHash<QString, std::shared_ptr<Token> > &tokens);
-    void uploadSubjects(const QHash<QString, std::shared_ptr<Subject> > &subjects);
-    void deleteItems(const QList<QString> &ids, const QString &tableName);
+    bool uploadTokens(const QHash<QString, std::shared_ptr<Token> > &tokens);
+    bool uploadSubjects(const QHash<QString, std::shared_ptr<Subject> > &subjects);
+    bool deleteItems(const QList<QString> &ids, const QString &tableName);
 
     std::shared_ptr<Token> getToken(const QString &id);
 
@@ -45,7 +46,7 @@ public:
     bool isValid();
 
 private:
-    bool exists(const QString &id, const QString &tableName);
+    int exists(const QString &id, const QString &tableName);
 
     QSqlQuery getUpdatedTokens();
     std::shared_ptr<Data> composeData(const QSqlQuery &updatedQuery, QSqlQuery &deletedQuery);
diff --git a/src/colnod/syncmanager.cpp b/src/colnod/syncmanager.cpp
index a398d39..06ccfd9 100644
--- a/src/colnod/syncmanager.cpp
+++ b/src/colnod/syncmanager.cpp
@@ -115,8 +115,9 @@ bool SyncManager::startSynchronization()
     return true;
 }
 
-void SyncManager::downloadData()
+bool SyncManager::downloadData()
 {
+    bool res = true;
     qInfo(syncmanager) << equals;
     qInfo(syncmanager) << "DOWNLOADING DATA -> BEGIN";
     qInfo(syncmanager) << dash;
@@ -127,10 +128,12 @@ void SyncManager::downloadData()
     //connect(database.get(), &DatabaseAPI::downloadDataFinished, this, &SyncManager::saveDatabaseData);
     //database->downloadData();
     colnod->downloadData();
+
+    return true;
 }
 
 // finds conflicts -> changes on both sides (colnod and DB), apply newer change
-void SyncManager::prepareData()
+bool SyncManager::prepareData()
 {
     qInfo(syncmanager) << equals;
     qInfo(syncmanager) << "PREPARING DATA -> BEGIN";
@@ -217,9 +220,10 @@ void SyncManager::prepareData()
 
     qInfo(syncmanager) << "PREPARING DATA -> FINISHED";
     qInfo(syncmanager) << equals;
+    return true;
 }
 
-void SyncManager::processData()
+bool SyncManager::processData()
 {
     qInfo(syncmanager) << equals;
     qInfo(syncmanager) << "PROCESSING DATA -> BEGIN";
@@ -230,6 +234,7 @@ void SyncManager::processData()
     database->processData(colnodDataToProcess);
     connect(colnod.get(), &ColnodAPI::dataProcessFinished, this, &SyncManager::dataProcessFinished);
     colnod->processData(databaseDataToProcess);
+    return true;
 }
 
 void SyncManager::updateLastUpdate(qint64 syncBegin)
diff --git a/src/colnod/syncmanager.h b/src/colnod/syncmanager.h
index 78594ec..07c92e0 100644
--- a/src/colnod/syncmanager.h
+++ b/src/colnod/syncmanager.h
@@ -8,7 +8,6 @@ Q_DECLARE_LOGGING_CATEGORY(syncmanager)
 class SyncManager : public QObject
 {
     Q_OBJECT
-
 public:
     explicit SyncManager(bool dryMode);
 
@@ -16,9 +15,9 @@ public:
     bool startSynchronization();
 
 private:
-    void downloadData();
-    void prepareData();
-    void processData();
+    bool downloadData();
+    bool prepareData();
+    bool processData();
     void updateLastUpdate(qint64 syncBegin);
 
 
@@ -32,6 +31,8 @@ signals:
     void dataProcessFinished();
     void syncFinished();
 
+    void error();
+
 private:
     std::shared_ptr<ColnodAPI> colnod;
     std::shared_ptr<DatabaseAPI> database;
@@ -47,4 +48,6 @@ private:
 
     int dataAmount = 0;
     bool mDryMode;
+
+    std::function<void()> onError = nullptr;
 };