diff --git a/sources/queued-daemon/src/main.cpp b/sources/queued-daemon/src/main.cpp
index d124907..2c1882f 100644
--- a/sources/queued-daemon/src/main.cpp
+++ b/sources/queued-daemon/src/main.cpp
@@ -65,27 +65,21 @@ int main(int argc, char *argv[])
     parser.addHelpOption();
     parser.addVersionOption();
     // info
-    QCommandLineOption infoOption(QStringList() << "i"
-                                                << "info",
-                                  "Show additional info.");
+    QCommandLineOption infoOption({"i", "info"}, "Show additional info.");
     parser.addOption(infoOption);
 
     // configuration option
-    QCommandLineOption configOption(QStringList() << "c"
-                                                  << "config",
+    QCommandLineOption configOption({"c", "config"},
                                     "Read initial configuration from file.",
                                     "config", QueuedSettings::defaultPath());
     parser.addOption(configOption);
 
     // debug mode
-    QCommandLineOption debugOption(QStringList() << "d"
-                                                 << "debug",
-                                   "Print debug information.");
+    QCommandLineOption debugOption({"d", "debug"}, "Print debug information.");
     parser.addOption(debugOption);
 
     // daemon mode
-    QCommandLineOption daemonOption(QStringList() << "daemon",
-                                    "Start detached.");
+    QCommandLineOption daemonOption("daemon", "Start detached.");
     parser.addOption(daemonOption);
 
     parser.process(app);
diff --git a/sources/queued-server/src/QueuedTcpServerResponseHelperUser.cpp b/sources/queued-server/src/QueuedTcpServerResponseHelperUser.cpp
index 7ebdfb2..9e057d9 100644
--- a/sources/queued-server/src/QueuedTcpServerResponseHelperUser.cpp
+++ b/sources/queued-server/src/QueuedTcpServerResponseHelperUser.cpp
@@ -17,6 +17,7 @@
 #include "QueuedTcpServerResponseHelperUser.h"
 
 #include <queued/Queued.h>
+#include <queued/QueuedUser.h>
 
 
 QVariantHash QueuedTcpServerResponseHelperUser::addOrEditUser(
@@ -72,6 +73,7 @@ QueuedTcpServerResponseHelperUser::getDefinitions(const QVariantHash &_data)
     res.match([&defs](const QString &val) { defs.password = val; },
               [](const QueuedError &) {});
     defs.permissions = _data["permissions"].toUInt();
+    defs.priority = _data["priority"].toUInt();
     // limits
     QueuedLimits::Limits limits;
     limits.cpu = _data["limitCpu"].toLongLong();
diff --git a/sources/queued-server/src/main.cpp b/sources/queued-server/src/main.cpp
index c9af063..2ca9fe6 100644
--- a/sources/queued-server/src/main.cpp
+++ b/sources/queued-server/src/main.cpp
@@ -55,20 +55,15 @@ int main(int argc, char *argv[])
     parser.addHelpOption();
     parser.addVersionOption();
     // info
-    QCommandLineOption infoOption(QStringList() << "i"
-                                                << "info",
-                                  "Show additional info.");
+    QCommandLineOption infoOption({"i", "info"}, "Show additional info.");
     parser.addOption(infoOption);
 
     // debug mode
-    QCommandLineOption debugOption(QStringList() << "d"
-                                                 << "debug",
-                                   "Print debug information.");
+    QCommandLineOption debugOption({"d", "debug"}, "Print debug information.");
     parser.addOption(debugOption);
 
     // daemon mode
-    QCommandLineOption daemonOption(QStringList() << "daemon",
-                                    "Start detached.");
+    QCommandLineOption daemonOption("daemon", "Start detached.");
     parser.addOption(daemonOption);
 
     parser.process(app);
diff --git a/sources/queued/include/queued/QueuedCore.h b/sources/queued/include/queued/QueuedCore.h
index ffc0eee..c2930c6 100644
--- a/sources/queued/include/queued/QueuedCore.h
+++ b/sources/queued/include/queued/QueuedCore.h
@@ -72,16 +72,20 @@ public:
      * working directory
      * @param _userId
      * task owner user ID
+     * @param _nice
+     * task nice level
      * @param _limits
      * task defined limits
      * @param _token
      * user auth token
      * @return task ID or -1 if no task added
      */
-    QueuedResult<long long>
-    addTask(const QString &_command, const QStringList &_arguments,
-            const QString &_workingDirectory, const long long _userId,
-            const QueuedLimits::Limits &_limits, const QString &_token);
+    QueuedResult<long long> addTask(const QString &_command,
+                                    const QStringList &_arguments,
+                                    const QString &_workingDirectory,
+                                    const long long _userId, const uint _nice,
+                                    const QueuedLimits::Limits &_limits,
+                                    const QString &_token);
     /**
      * @brief add new user
      * @param _name
@@ -92,6 +96,8 @@ public:
      * user password
      * @param _permissions
      * user permissions
+     * @param _priority
+     * user priority
      * @param _limits
      * user limits
      * @param _token
@@ -101,6 +107,7 @@ public:
     QueuedResult<long long> addUser(const QString &_name, const QString &_email,
                                     const QString &_password,
                                     const uint _permissions,
+                                    const uint _priority,
                                     const QueuedLimits::Limits &_limits,
                                     const QString &_token);
     /**
diff --git a/sources/queued/include/queued/QueuedCoreInterface.h b/sources/queued/include/queued/QueuedCoreInterface.h
index 418abef..981c9fb 100644
--- a/sources/queued/include/queued/QueuedCoreInterface.h
+++ b/sources/queued/include/queued/QueuedCoreInterface.h
@@ -109,6 +109,8 @@ public slots:
      * working directory
      * @param user
      * user ID
+     * @param nice
+     * nice level
      * @param cpu
      * limit by CPU cores
      * @param gpu
@@ -125,9 +127,10 @@ public slots:
      */
     QDBusVariant TaskAdd(const QString &command, const QStringList &arguments,
                          const QString &workingDirectory, const qlonglong user,
-                         const qlonglong cpu, const qlonglong gpu,
-                         const qlonglong memory, const qlonglong gpumemory,
-                         const qlonglong storage, const QString &token);
+                         const uint nice, const qlonglong cpu,
+                         const qlonglong gpu, const qlonglong memory,
+                         const qlonglong gpumemory, const qlonglong storage,
+                         const QString &token);
     /**
      * @brief edit task
      * @param id
@@ -202,6 +205,8 @@ public slots:
      * user password
      * @param permissions
      * user permissions
+     * @param priority
+     * user permissions
      * @param cpu
      * limit by CPU cores
      * @param gpu
@@ -218,9 +223,10 @@ public slots:
      */
     QDBusVariant UserAdd(const QString &name, const QString &email,
                          const QString &password, const uint permissions,
-                         const qlonglong cpu, const qlonglong gpu,
-                         const qlonglong memory, const qlonglong gpumemory,
-                         const qlonglong storage, const QString &token);
+                         const uint priority, const qlonglong cpu,
+                         const qlonglong gpu, const qlonglong memory,
+                         const qlonglong gpumemory, const qlonglong storage,
+                         const QString &token);
     /**
      * @brief edit user
      * @param id
diff --git a/sources/queued/include/queued/QueuedDatabase.h b/sources/queued/include/queued/QueuedDatabase.h
index c2d40f8..a86dcb0 100644
--- a/sources/queued/include/queued/QueuedDatabase.h
+++ b/sources/queued/include/queued/QueuedDatabase.h
@@ -202,8 +202,8 @@ private:
      * value to build payload
      * @return list of keys and list of values
      */
-    QPair<QStringList, QStringList>
-    getQueryPayload(const QString &_table, const QVariantHash &_value) const;
+    QHash<QString, QString> getQueryPayload(const QString &_table,
+                                            const QVariantHash &_value) const;
 };
 
 
diff --git a/sources/queued/include/queued/QueuedDatabaseSchema.h b/sources/queued/include/queued/QueuedDatabaseSchema.h
index ea67370..67e2a9d 100644
--- a/sources/queued/include/queued/QueuedDatabaseSchema.h
+++ b/sources/queued/include/queued/QueuedDatabaseSchema.h
@@ -115,7 +115,8 @@ static const QueuedDBSchema DBSchema = {
       {"email", {"email", "TEXT", QVariant::String, false}},
       {"lastLogin", {"lastLogin", "TEXT", QVariant::String, true}},
       {"limits", {"limits", "TEXT", QVariant::String, true}},
-      {"permissions", {"permissions", "INT", QVariant::UInt, true}}}}};
+      {"permissions", {"permissions", "INT", QVariant::UInt, true}},
+      {"priotiry", {"priority", "INT", QVariant::UInt, true}}}}};
 };
 
 #endif /* QUEUEDDATABASESCHEMA_H */
diff --git a/sources/queued/include/queued/QueuedUser.h b/sources/queued/include/queued/QueuedUser.h
index dd5b9ad..c9c4091 100644
--- a/sources/queued/include/queued/QueuedUser.h
+++ b/sources/queued/include/queued/QueuedUser.h
@@ -43,6 +43,7 @@ class QueuedUser : public QObject
     Q_PROPERTY(QString name READ name WRITE setName)
     Q_PROPERTY(QString password READ password WRITE setPassword)
     Q_PROPERTY(uint permissions READ permissions WRITE setPermissions)
+    Q_PROPERTY(uint priority READ priority WRITE setPriority)
     // limits
     Q_PROPERTY(QString limits READ limits WRITE setLimits)
 
@@ -66,6 +67,7 @@ public:
         QString email;
         QString password;
         uint permissions = 0;
+        uint priority = 0;
         QString limits;
     } QueuedUserDefinitions;
 
@@ -164,6 +166,11 @@ public:
      * @return sum of user permissions from QueuedUser::Permissions
      */
     uint permissions() const;
+    /**
+     * @brief user max priority
+     * @return user maximal priority value
+     */
+    uint priority() const;
     // permissions
     /**
      * @brief user limits
@@ -195,6 +202,12 @@ public:
      * new user permissions
      */
     void setPermissions(const uint _permissions);
+    /**
+     * @brief set user priority
+     * @param _priority
+     * new user priority value
+     */
+    void setPriority(const uint _priority);
     // permissions
     /**
      * @brief set limits
diff --git a/sources/queued/include/queued/private/QueuedCorePrivate.h b/sources/queued/include/queued/private/QueuedCorePrivate.h
index 8bfea14..1925811 100644
--- a/sources/queued/include/queued/private/QueuedCorePrivate.h
+++ b/sources/queued/include/queued/private/QueuedCorePrivate.h
@@ -81,16 +81,20 @@ public:
      * working directory
      * @param _userId
      * task owner user ID
+     * @param _nice
+     * task nice level
      * @param _limits
      * task defined limits
      * @param _token
      * user auth token
      * @return task ID or -1 if no task added
      */
-    QueuedResult<long long>
-    addTask(const QString &_command, const QStringList &_arguments,
-            const QString &_workingDirectory, const long long _userId,
-            const QueuedLimits::Limits &_limits, const QString &_token);
+    QueuedResult<long long> addTask(const QString &_command,
+                                    const QStringList &_arguments,
+                                    const QString &_workingDirectory,
+                                    const long long _userId, const uint _nice,
+                                    const QueuedLimits::Limits &_limits,
+                                    const QString &_token);
     /**
      * @brief add new user
      * @param _name
@@ -101,6 +105,8 @@ public:
      * user password
      * @param _permissions
      * user permissions
+     * @param _priority
+     * user priority
      * @param _limits
      * user limits
      * @param _token
@@ -110,6 +116,7 @@ public:
     QueuedResult<long long> addUser(const QString &_name, const QString &_email,
                                     const QString &_password,
                                     const uint _permissions,
+                                    const uint _priority,
                                     const QueuedLimits::Limits &_limits,
                                     const QString &_token);
     /**
diff --git a/sources/queued/include/queued/private/QueuedCorePrivateHelper.h b/sources/queued/include/queued/private/QueuedCorePrivateHelper.h
index 55d480b..5bf645b 100644
--- a/sources/queued/include/queued/private/QueuedCorePrivateHelper.h
+++ b/sources/queued/include/queued/private/QueuedCorePrivateHelper.h
@@ -125,15 +125,16 @@ private:
      * working directory
      * @param _userId
      * task owner user ID
+     * @param _nice
+     * task nice level
      * @param _limits
      * task defined limits
      * @return task ID or -1 if no task added
      */
-    QueuedResult<long long> addTaskPrivate(const QString &_command,
-                                           const QStringList &_arguments,
-                                           const QString &_workingDirectory,
-                                           const long long _userId,
-                                           const QueuedLimits::Limits &_limits);
+    QueuedResult<long long>
+    addTaskPrivate(const QString &_command, const QStringList &_arguments,
+                   const QString &_workingDirectory, const long long _userId,
+                   const uint _nice, const QueuedLimits::Limits &_limits);
     /**
      * @brief add new user
      * @param _name
@@ -144,15 +145,16 @@ private:
      * user password
      * @param _permissions
      * user permissions
+     * @param _priority
+     * user priority
      * @param _limits
      * user limits
      * @return user ID or -1 if no user found
      */
-    QueuedResult<long long> addUserPrivate(const QString &_name,
-                                           const QString &_email,
-                                           const QString &_password,
-                                           const uint _permissions,
-                                           const QueuedLimits::Limits &_limits);
+    QueuedResult<long long>
+    addUserPrivate(const QString &_name, const QString &_email,
+                   const QString &_password, const uint _permissions,
+                   const uint _priority, const QueuedLimits::Limits &_limits);
     /**
      * @brief edit advanced settings
      * @param _key
diff --git a/sources/queued/src/QueuedCore.cpp b/sources/queued/src/QueuedCore.cpp
index 44b0e28..7139ab7 100644
--- a/sources/queued/src/QueuedCore.cpp
+++ b/sources/queued/src/QueuedCore.cpp
@@ -71,13 +71,14 @@ QueuedResult<bool> QueuedCore::addPlugin(const QString &_plugin,
 QueuedResult<long long>
 QueuedCore::addTask(const QString &_command, const QStringList &_arguments,
                     const QString &_workingDirectory, const long long _userId,
-                    const QueuedLimits::Limits &_limits, const QString &_token)
+                    const uint _nice, const QueuedLimits::Limits &_limits,
+                    const QString &_token)
 {
     qCDebug(LOG_LIB) << "Add task" << _command << "with arguments" << _arguments
                      << "from user" << _userId;
 
     return m_impl->addTask(_command, _arguments, _workingDirectory, _userId,
-                           _limits, _token);
+                           _nice, _limits, _token);
 }
 
 
@@ -87,13 +88,14 @@ QueuedCore::addTask(const QString &_command, const QStringList &_arguments,
 QueuedResult<long long>
 QueuedCore::addUser(const QString &_name, const QString &_email,
                     const QString &_password, const uint _permissions,
-                    const QueuedLimits::Limits &_limits, const QString &_token)
+                    const uint _priority, const QueuedLimits::Limits &_limits,
+                    const QString &_token)
 {
     qCDebug(LOG_LIB) << "Add user" << _name << "with email" << _email
                      << "and permissions" << _permissions;
 
-    return m_impl->addUser(_name, _email, _password, _permissions, _limits,
-                           _token);
+    return m_impl->addUser(_name, _email, _password, _permissions, _priority,
+                           _limits, _token);
 }
 
 
diff --git a/sources/queued/src/QueuedCoreAdaptor.cpp b/sources/queued/src/QueuedCoreAdaptor.cpp
index 42dba3b..e404b55 100644
--- a/sources/queued/src/QueuedCoreAdaptor.cpp
+++ b/sources/queued/src/QueuedCoreAdaptor.cpp
@@ -22,6 +22,7 @@
 
 
 #include <queued/Queued.h>
+#include <queued/QueuedUser.h>
 
 
 /**
@@ -125,6 +126,7 @@ QueuedResult<long long> QueuedCoreAdaptor::sendTaskAdd(
                          _definitions.arguments,
                          _definitions.workingDirectory,
                          _definitions.user,
+                         _definitions.nice,
                          limits.cpu,
                          limits.gpu,
                          limits.memory,
@@ -212,6 +214,7 @@ QueuedResult<long long> QueuedCoreAdaptor::sendUserAdd(
                          _definitions.email,
                          _definitions.password,
                          _definitions.permissions,
+                         _definitions.priority,
                          limits.cpu,
                          limits.gpu,
                          limits.memory,
diff --git a/sources/queued/src/QueuedCoreInterface.cpp b/sources/queued/src/QueuedCoreInterface.cpp
index 5bdf4b4..7c527c0 100644
--- a/sources/queued/src/QueuedCoreInterface.cpp
+++ b/sources/queued/src/QueuedCoreInterface.cpp
@@ -124,15 +124,15 @@ QDBusVariant QueuedCoreInterface::PluginRemove(const QString &plugin,
  */
 QDBusVariant QueuedCoreInterface::TaskAdd(
     const QString &command, const QStringList &arguments,
-    const QString &workingDirectory, const qlonglong user, const qlonglong cpu,
-    const qlonglong gpu, const qlonglong memory, const qlonglong gpumemory,
-    const qlonglong storage, const QString &token)
+    const QString &workingDirectory, const qlonglong user, const uint nice,
+    const qlonglong cpu, const qlonglong gpu, const qlonglong memory,
+    const qlonglong gpumemory, const qlonglong storage, const QString &token)
 {
     qCDebug(LOG_DBUS) << "Add new task with parameters" << command << arguments
                       << workingDirectory << "from user" << user;
 
     return QueuedCoreAdaptor::toDBusVariant(m_core->addTask(
-        command, arguments, workingDirectory, user,
+        command, arguments, workingDirectory, user, nice,
         QueuedLimits::Limits(cpu, gpu, memory, gpumemory, storage), token));
 }
 
@@ -229,18 +229,17 @@ QDBusVariant QueuedCoreInterface::TryAuth(const QString &token)
 /**
  * @fn UserAdd
  */
-QDBusVariant
-QueuedCoreInterface::UserAdd(const QString &name, const QString &email,
-                             const QString &password, const uint permissions,
-                             const qlonglong cpu, const qlonglong gpu,
-                             const qlonglong memory, const qlonglong gpumemory,
-                             const qlonglong storage, const QString &token)
+QDBusVariant QueuedCoreInterface::UserAdd(
+    const QString &name, const QString &email, const QString &password,
+    const uint permissions, const uint priority, const qlonglong cpu,
+    const qlonglong gpu, const qlonglong memory, const qlonglong gpumemory,
+    const qlonglong storage, const QString &token)
 {
     qCDebug(LOG_DBUS) << "Add new user with paramaters" << name << email
                       << permissions;
 
     return QueuedCoreAdaptor::toDBusVariant(m_core->addUser(
-        name, email, password, permissions,
+        name, email, password, permissions, priority,
         QueuedLimits::Limits(cpu, gpu, memory, gpumemory, storage), token));
 }
 
diff --git a/sources/queued/src/QueuedCorePrivate.cpp b/sources/queued/src/QueuedCorePrivate.cpp
index 1256ffd..2beb8d1 100644
--- a/sources/queued/src/QueuedCorePrivate.cpp
+++ b/sources/queued/src/QueuedCorePrivate.cpp
@@ -56,7 +56,7 @@ QueuedResult<bool> QueuedCorePrivate::addPlugin(const QString &_plugin,
  */
 QueuedResult<long long> QueuedCorePrivate::addTask(
     const QString &_command, const QStringList &_arguments,
-    const QString &_workingDirectory, const long long _userId,
+    const QString &_workingDirectory, const long long _userId, const uint _nice,
     const QueuedLimits::Limits &_limits, const QString &_token)
 {
     qCDebug(LOG_LIB) << "Add task" << _command << "with arguments" << _arguments
@@ -93,18 +93,17 @@ QueuedResult<long long> QueuedCorePrivate::addTask(
     }
 
     return m_helper->addTaskPrivate(_command, _arguments, _workingDirectory,
-                                    _userId, _limits);
+                                    _userId, _nice, _limits);
 }
 
 
 /**
  * @fn addUser
  */
-QueuedResult<long long>
-QueuedCorePrivate::addUser(const QString &_name, const QString &_email,
-                           const QString &_password, const uint _permissions,
-                           const QueuedLimits::Limits &_limits,
-                           const QString &_token)
+QueuedResult<long long> QueuedCorePrivate::addUser(
+    const QString &_name, const QString &_email, const QString &_password,
+    const uint _permissions, const uint _priority,
+    const QueuedLimits::Limits &_limits, const QString &_token)
 {
     qCDebug(LOG_LIB) << "Add user" << _name << "with email" << _email
                      << "and permissions" << _permissions;
@@ -126,7 +125,7 @@ QueuedCorePrivate::addUser(const QString &_name, const QString &_email,
     }
 
     return m_helper->addUserPrivate(_name, _email, _password, _permissions,
-                                    _limits);
+                                    _priority, _limits);
 }
 
 
@@ -245,6 +244,9 @@ QueuedResult<bool> QueuedCorePrivate::editTask(const long long _id,
     QVariantHash payload
         = isAdmin ? _taskData
                   : m_helper->dropAdminFields(QueuedDB::TASKS_TABLE, _taskData);
+    if (payload.contains("nice"))
+        payload["nice"]
+            = std::min(payload["nice"].toUInt(), authUser->priority());
 
     return m_helper->editTaskPrivate(_id, payload);
 }
diff --git a/sources/queued/src/QueuedCorePrivateHelper.cpp b/sources/queued/src/QueuedCorePrivateHelper.cpp
index 9c57c93..2b65fff 100644
--- a/sources/queued/src/QueuedCorePrivateHelper.cpp
+++ b/sources/queued/src/QueuedCorePrivateHelper.cpp
@@ -124,7 +124,7 @@ QueuedCorePrivateHelper::dropAdminFields(const QString &_table,
  */
 QueuedResult<long long> QueuedCorePrivateHelper::addTaskPrivate(
     const QString &_command, const QStringList &_arguments,
-    const QString &_workingDirectory, const long long _userId,
+    const QString &_workingDirectory, const long long _userId, const uint _nice,
     const QueuedLimits::Limits &_limits)
 {
     qCDebug(LOG_LIB) << "Add task" << _command << "with arguments" << _arguments
@@ -148,7 +148,7 @@ QueuedResult<long long> QueuedCorePrivateHelper::addTaskPrivate(
                                {"command", _command},
                                {"commandArguments", _arguments},
                                {"workDirectory", _workingDirectory},
-                               {"nice", 0},
+                               {"nice", std::min(_nice, userObj->priority())},
                                {"uid", ids.first},
                                {"gid", ids.second},
                                {"limits", taskLimits.toString()}};
@@ -173,16 +173,16 @@ QueuedResult<long long> QueuedCorePrivateHelper::addTaskPrivate(
  */
 QueuedResult<long long> QueuedCorePrivateHelper::addUserPrivate(
     const QString &_name, const QString &_email, const QString &_password,
-    const uint _permissions, const QueuedLimits::Limits &_limits)
+    const uint _permissions, const uint _priority,
+    const QueuedLimits::Limits &_limits)
 {
     qCDebug(LOG_LIB) << "Add user" << _name << "with email" << _email
                      << "and permissions" << _permissions;
     // add to database
-    QVariantHash properties = {{"name", _name},
-                               {"password", _password},
-                               {"email", _email},
-                               {"permissions", _permissions},
-                               {"limits", _limits.toString()}};
+    QVariantHash properties
+        = {{"name", _name},         {"password", _password},
+           {"email", _email},       {"permissions", _permissions},
+           {"priority", _priority}, {"limits", _limits.toString()}};
     auto id = database()->add(QueuedDB::USERS_TABLE, properties);
     if (id == -1) {
         qCWarning(LOG_LIB) << "Could not add user" << _name;
diff --git a/sources/queued/src/QueuedDatabase.cpp b/sources/queued/src/QueuedDatabase.cpp
index 8d25a5b..1f22de4 100644
--- a/sources/queued/src/QueuedDatabase.cpp
+++ b/sources/queued/src/QueuedDatabase.cpp
@@ -212,8 +212,8 @@ long long QueuedDatabase::add(const QString &_table, const QVariantHash &_value)
     // build query
     QSqlQuery query = m_database.exec(QString("INSERT INTO %1 (%2) VALUES (%3)")
                                           .arg(_table)
-                                          .arg(payload.first.join(','))
-                                          .arg(payload.second.join(',')));
+                                          .arg(payload.keys().join(','))
+                                          .arg(payload.values().join(',')));
     QSqlError error = query.lastError();
     if (error.isValid()) {
         qCCritical(LOG_LIB) << "Could not add record" << _value << "to table"
@@ -236,10 +236,8 @@ bool QueuedDatabase::modify(const QString &_table, const long long _id,
 
     auto payload = getQueryPayload(_table, _value);
     QStringList stringPayload;
-    for (int i = 0; i < payload.first.count(); i++)
-        stringPayload.append(QString("%1=%2")
-                                 .arg(payload.first.at(i))
-                                 .arg(payload.second.at(i)));
+    for (auto &key : payload.keys())
+        stringPayload.append(QString("%1=%2").arg(key).arg(payload[key]));
     // build query
     QSqlQuery query = m_database.exec(QString("UPDATE %1 SET %2 WHERE _id=%3")
                                           .arg(_table)
@@ -427,14 +425,13 @@ long long QueuedDatabase::lastInsertionId(const QString &_table) const
 /**
  * @fn getQueryPayload
  */
-QPair<QStringList, QStringList>
+QHash<QString, QString>
 QueuedDatabase::getQueryPayload(const QString &_table,
                                 const QVariantHash &_value) const
 {
     qCDebug(LOG_LIB) << "Add record" << _value << "to table" << _table;
 
-    QStringList keys;
-    QStringList values;
+    QHash<QString, QString> output;
     QStringList schemaColumns = QueuedDB::DBSchema[_table].keys();
     for (auto &key : _value.keys()) {
         if (!schemaColumns.contains(key)) {
@@ -446,9 +443,8 @@ QueuedDatabase::getQueryPayload(const QString &_table,
             qCWarning(LOG_LIB) << "Modifying record ID is not allowed";
             continue;
         }
-        keys.append(key);
-        values.append(QString("'%1'").arg(_value[key].toString()));
+        output[key] = QString("'%1'").arg(_value[key].toString());
     }
 
-    return {keys, values};
+    return output;
 }
diff --git a/sources/queued/src/QueuedUser.cpp b/sources/queued/src/QueuedUser.cpp
index 009d21c..da6438c 100644
--- a/sources/queued/src/QueuedUser.cpp
+++ b/sources/queued/src/QueuedUser.cpp
@@ -198,6 +198,15 @@ uint QueuedUser::permissions() const
 }
 
 
+/**
+ * @fn priority
+ */
+uint QueuedUser::priority() const
+{
+    return m_definitions.priority;
+}
+
+
 /**
  * @fn limits
  */
@@ -251,6 +260,17 @@ void QueuedUser::setPermissions(const uint _permissions)
 }
 
 
+/**
+ * @fn setPriority
+ */
+void QueuedUser::setPriority(const uint _priority)
+{
+    qCDebug(LOG_LIB) << "New user priority" << _priority;
+
+    m_definitions.priority = _priority;
+}
+
+
 /**
  * @fn setLimits
  */
diff --git a/sources/queued/src/QueuedUserManager.cpp b/sources/queued/src/QueuedUserManager.cpp
index 6af3e41..e736666 100644
--- a/sources/queued/src/QueuedUserManager.cpp
+++ b/sources/queued/src/QueuedUserManager.cpp
@@ -22,6 +22,7 @@
 
 
 #include <queued/Queued.h>
+#include <queued/QueuedUser.h>
 
 
 /**
@@ -64,6 +65,7 @@ QueuedUser *QueuedUserManager::add(const QVariantHash &_properties,
     defs.email = _properties["email"].toString();
     defs.password = _properties["password"].toString();
     defs.permissions = _properties["permissions"].toUInt();
+    defs.priority = _properties["priority"].toUInt();
     defs.limits = _properties["limits"].toString();
 
     return add(defs, _id);
diff --git a/sources/queuedctl/src/QueuedctlTask.cpp b/sources/queuedctl/src/QueuedctlTask.cpp
index aa783c6..95ab2c1 100644
--- a/sources/queuedctl/src/QueuedctlTask.cpp
+++ b/sources/queuedctl/src/QueuedctlTask.cpp
@@ -173,8 +173,7 @@ void QueuedctlTask::parserAdd(QCommandLineParser &_parser)
     _parser.addPositionalArgument("program", "Command line.", "<program>");
 
     // command line arguments
-    QCommandLineOption argumentOption(QStringList() << "a"
-                                                    << "argument",
+    QCommandLineOption argumentOption({"a", "argument"},
                                       "Command line argument.", "argument", "");
     _parser.addOption(argumentOption);
     // working directory
@@ -239,13 +238,11 @@ void QueuedctlTask::parserSet(QCommandLineParser &_parser)
     _parser.addPositionalArgument("id", "Task ID.", "<id>");
 
     // command line
-    QCommandLineOption commandOption(QStringList() << "p"
-                                                   << "program",
-                                     "Command line.", "program", "");
+    QCommandLineOption commandOption({"p", "program"}, "Command line.",
+                                     "program", "");
     _parser.addOption(commandOption);
     // command line arguments
-    QCommandLineOption argumentOption(QStringList() << "a"
-                                                    << "argument",
+    QCommandLineOption argumentOption({"a", "argument"},
                                       "Command line argument.", "argument", "");
     _parser.addOption(argumentOption);
     // working directory
diff --git a/sources/queuedctl/src/QueuedctlUser.cpp b/sources/queuedctl/src/QueuedctlUser.cpp
index ebf76f0..37c2fc5 100644
--- a/sources/queuedctl/src/QueuedctlUser.cpp
+++ b/sources/queuedctl/src/QueuedctlUser.cpp
@@ -96,6 +96,7 @@ QueuedctlUser::getDefinitions(const QCommandLineParser &_parser,
         [&definitions](const QueuedError &) { definitions.password = ""; });
 
     definitions.email = _parser.value("email");
+    definitions.priority = _parser.value("priority").toUInt();
     // limits now
     QueuedLimits::Limits limits(
         _parser.value("limit-cpu").toLongLong(),
@@ -200,15 +201,16 @@ void QueuedctlUser::parserAdd(QCommandLineParser &_parser)
     _parser.addPositionalArgument("name", "User name.", "<name>");
 
     // permissions
-    QCommandLineOption accessOption(QStringList() << "a"
-                                                  << "access",
-                                    "User permission.", "access", "0");
+    QCommandLineOption accessOption({"a", "access"}, "User permission.",
+                                    "access", "0");
     _parser.addOption(accessOption);
     // email
-    QCommandLineOption emailOption(QStringList() << "e"
-                                                 << "email",
-                                   "User email.", "email", "");
+    QCommandLineOption emailOption({"e", "email"}, "User email.", "email", "");
     _parser.addOption(emailOption);
+    // priority
+    QCommandLineOption priorityOption({"p", "priority"}, "User priority.",
+                                      "priority", "0");
+    _parser.addOption(priorityOption);
     // password
     QCommandLineOption passwordOption("password", "User password.", "password",
                                       "");
@@ -276,15 +278,15 @@ void QueuedctlUser::parserSet(QCommandLineParser &_parser)
     _parser.addPositionalArgument("id", "User ID.", "<id>");
 
     // email
-    QCommandLineOption emailOption(QStringList() << "e"
-                                                 << "email",
-                                   "User email.", "email", "");
+    QCommandLineOption emailOption({"e", "email"}, "User email.", "email", "");
     _parser.addOption(emailOption);
     // name
-    QCommandLineOption nameOption(QStringList() << "n"
-                                                << "name",
-                                  "User name.", "name", "");
+    QCommandLineOption nameOption({"n", "name"}, "User name.", "name", "");
     _parser.addOption(nameOption);
+    // priority
+    QCommandLineOption priorityOption({"p", "priority"}, "User priority.",
+                                      "priority", "0");
+    _parser.addOption(priorityOption);
     // password
     QCommandLineOption passwordOption("password", "User password.", "password",
                                       "");
diff --git a/sources/queuedctl/src/main.cpp b/sources/queuedctl/src/main.cpp
index 284984f..5c2badf 100644
--- a/sources/queuedctl/src/main.cpp
+++ b/sources/queuedctl/src/main.cpp
@@ -43,25 +43,18 @@ int main(int argc, char *argv[])
     parser.addHelpOption();
     parser.addVersionOption();
     // info
-    QCommandLineOption infoOption(QStringList() << "i"
-                                                << "info",
-                                  "Shows additional info.");
+    QCommandLineOption infoOption({"i", "info"}, "Shows additional info.");
     parser.addOption(infoOption);
 
     // debug mode
-    QCommandLineOption debugOption(QStringList() << "d"
-                                                 << "debug",
-                                   "Prints debug information.");
+    QCommandLineOption debugOption({"d", "debug"}, "Prints debug information.");
     parser.addOption(debugOption);
 
     // configuration option
-    QCommandLineOption tokenOption(QStringList() << "t"
-                                                 << "token",
-                                   "Path to cached token.", "token",
-                                   QueuedSettings::defaultTokenPath());
+    QCommandLineOption tokenOption({"t", "token"}, "Path to cached token.",
+                                   "token", QueuedSettings::defaultTokenPath());
     parser.addOption(tokenOption);
-    QCommandLineOption userOption(QStringList() << "u"
-                                                << "user",
+    QCommandLineOption userOption({"u", "user"},
                                   "User to login instead of current one.",
                                   "user", ::getlogin());
     parser.addOption(userOption);