Merge branch 'time_machine'

.env

@@ -59,3 +59,17 @@ EMAIL_SENDER_EMAIL=noreply@partdb.changeme
 # Set this to 1 to allow reset of a password per email
 ALLOW_EMAIL_PW_RESET=0
 
+
+######################################################################################
+# History/Eventlog related settings
+######################################################################################
+
+# If you want to use full timetrave functionality
+
+# Save which fields were changed in a ElementEdited log entry
+HISTORY_SAVE_CHANGED_FIELDS=1
+# Save the old data in the  ElementEdited log entry (warning this could increase the database size in short time)
+HISTORY_SAVE_CHANGED_DATA=0
+# Save the data of an element that gets removed into log entry. This allows to undelete an element
+HISTORY_SAVE_REMOVED_DATA=0
+

assets/css/app.css

@@ -242,6 +242,16 @@ showing the sidebar (on devices with md or higher)
 * Bootstrap extensions
 *****************************************/
 
+.bg-primary-striped {
+    background: repeating-linear-gradient(
+            -45deg,
+            var(--primary),
+            var(--primary) 10px,
+            var(--info) 10px,
+            var(--info) 20px
+    )
+}
+
 .form-group-sm {
     margin-bottom: 5px;
 }
@@ -310,6 +320,10 @@ showing the sidebar (on devices with md or higher)
     }
 }
 
+.not-allowed {
+    cursor: not-allowed !important;
+}
+
 /**************************************
 btn-xs
 btn-xs

config/packages/php_translation.yaml

@@ -1,5 +1,5 @@
 translation:
-    locales: ["en", "de", "ru"]
+    locales: ["en", "de"]
     edit_in_place:
         enabled: false
         config_name: app

config/permissions.yaml

@@ -67,6 +67,10 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
       show_history:
         label: "perm.part.show_history"
         bit: 30
+      revert_element:
+        label: "perm.revert_elements"
+        bit: 32
+        alsoSet: ["read", "edit", "create", "delete", "show_history"]
 
   parts_name:  &PART_ATTRIBUTE # We define a template here, that we can use for all part attributes.
     label: "perm.part.name"
@@ -154,8 +158,31 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
     label: "perm.part.lots"
 
   parts_attachments:
-    <<: *PART_MULTI_ATTRIBUTE
+    group: "structures"
     label: "perm.part.attachments"
+    operations:
+      read:
+        label: "perm.read"
+        bit: 0
+      edit:
+        label: "perm.edit"
+        bit: 2
+        alsoSet: 'read'
+      create:
+        label: "perm.create"
+        bit: 4
+        alsoSet: ['read', 'edit']
+      delete:
+        label: "perm.delete"
+        bit: 6
+        alsoSet: ['read']
+      show_history:
+        label: "perm.show_history"
+        bit: 8
+      revert_element:
+        label: "perm.revert_elements"
+        bit: 10
+        alsoSet: ["read", "edit", "create", "delete", "show_history"]
 
   parts_order:
     <<: *PART_ATTRIBUTE
@@ -189,6 +216,13 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
       show_users:
         label: "perm.show_users"
         bit: 12
+      show_history:
+        label: "perm.show_history"
+        bit: 14
+      revert_element:
+        label: "perm.revert_elements"
+        bit: 16
+        alsoSet: ["read", "edit", "create", "delete", "show_history"]
 
   footprints:
     <<: *PART_CONTAINING
@@ -243,6 +277,12 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
       statistics:
         label: "perm.tools.statistics"
         bit: 10
+      lastActivity:
+        label: "perm.tools.lastActivity"
+        bit: 12
+      timetravel:
+        label: "perm.tools.timeTravel"
+        bit: 14
 
   groups:
     label: "perm.groups"
@@ -270,6 +310,13 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
         label: "perm.edit_permissions"
         alsoSet: ['read', 'edit']
         bit: 10
+      show_history:
+        label: "perm.show_history"
+        bit: 12
+      revert_element:
+        label: "perm.revert_elements"
+        bit: 14
+        alsoSet: ["read", "edit", "create", "delete", "move", "edit_permissions", "show_history"]
 
   users:
     label: "perm.users"
@@ -309,6 +356,13 @@ perms: # Here comes a list with all Permission names (they have a perm_[name] co
       change_user_settings:
         label: "perm.users.change_user_settings"
         bit: 16
+      show_history:
+        label: "perm.show_history"
+        bit: 18
+      revert_element:
+        label: "perm.revert_elements"
+        bit: 20
+        alsoSet: ["read", "edit", "create", "delete", "move", "edit_permissions", "show_history", "edit_infos", "change_group", "edit_username"]
 
   database:
     label: "perm.database"

config/services.yaml

@@ -74,6 +74,10 @@ services:
             - { name: "doctrine.orm.entity_listener" }
 
     App\EventSubscriber\EventLoggerSubscriber:
+        arguments:
+            $save_changed_fields: '%env(bool:HISTORY_SAVE_CHANGED_FIELDS)%'
+            $save_changed_data: '%env(bool:HISTORY_SAVE_CHANGED_DATA)%'
+            $save_removed_data: '%env(bool:HISTORY_SAVE_REMOVED_DATA)%'
         tags:
             - { name: 'doctrine.event_subscriber' }
 
@@ -92,6 +96,11 @@ services:
         tags:
             - name: doctrine.orm.entity_listener
 
+    # Dont use JSONSerializable Interface,
+    serializer.normalizer.json_serializable:
+        class: Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer
+        tags:
+          - {name: serializer.normalizer, priority: -9000}
 
     App\Controller\RedirectController:
         arguments:

src/Command/ShowEventLogCommand.php

@@ -137,6 +137,7 @@ class ShowEventLogCommand extends Command
         $headers = ['ID', 'Timestamp', 'Type', 'User', 'Target Type', 'Target'];
         if ($showExtra) {
             $headers[] = 'Extra data';
+            $table->setColumnMaxWidth(6, 50);
         }
         $table->setHeaders($headers);
 
@@ -144,6 +145,9 @@ class ShowEventLogCommand extends Command
             $this->addTableRow($table, $entry, $showExtra);
         }
 
+        $table->setColumnMaxWidth(3, 20);
+        $table->setColumnMaxWidth(5, 30);
+
         $table->render();
     }
 

src/Controller/AdminPages/AttachmentTypeController.php

@@ -79,7 +79,7 @@ class AttachmentTypeController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="attachment_type_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="attachment_type_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      *
      * @param  AttachmentType  $entity
@@ -87,9 +87,9 @@ class AttachmentTypeController extends BaseAdminController
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(AttachmentType $entity, Request $request, EntityManagerInterface $em): Response
+    public function edit(AttachmentType $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null): Response
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/BaseAdminController.php

@@ -42,6 +42,7 @@ declare(strict_types=1);
 
 namespace App\Controller\AdminPages;
 
+use App\DataTables\LogDataTable;
 use App\Entity\Base\AbstractNamedDBElement;
 use App\Entity\Base\AbstractStructuralDBElement;
 use App\Entity\UserSystem\User;
@@ -52,9 +53,13 @@ use App\Services\Attachments\AttachmentManager;
 use App\Services\Attachments\AttachmentSubmitHandler;
 use App\Services\EntityExporter;
 use App\Services\EntityImporter;
+use App\Services\LogSystem\EventCommentHelper;
+use App\Services\LogSystem\HistoryHelper;
+use App\Services\LogSystem\TimeTravel;
 use App\Services\StructuralElementRecursionHelper;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
+use Omines\DataTablesBundle\DataTableFactory;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -77,9 +82,16 @@ abstract class BaseAdminController extends AbstractController
     protected $translator;
     protected $attachmentHelper;
     protected $attachmentSubmitHandler;
+    protected $commentHelper;
+
+    protected $historyHelper;
+    protected $timeTravel;
+    protected $dataTableFactory;
 
     public function __construct(TranslatorInterface $translator, UserPasswordEncoderInterface $passwordEncoder,
-                                AttachmentManager $attachmentHelper, AttachmentSubmitHandler $attachmentSubmitHandler)
+        AttachmentManager $attachmentHelper, AttachmentSubmitHandler $attachmentSubmitHandler,
+        EventCommentHelper $commentHelper, HistoryHelper $historyHelper, TimeTravel $timeTravel,
+        DataTableFactory $dataTableFactory)
     {
         if ('' === $this->entity_class || '' === $this->form_class || '' === $this->twig_template || '' === $this->route_base) {
             throw new InvalidArgumentException('You have to override the $entity_class, $form_class, $route_base and $twig_template value in your subclasss!');
@@ -93,14 +105,54 @@ abstract class BaseAdminController extends AbstractController
         $this->passwordEncoder = $passwordEncoder;
         $this->attachmentHelper = $attachmentHelper;
         $this->attachmentSubmitHandler = $attachmentSubmitHandler;
+        $this->commentHelper = $commentHelper;
+        $this->historyHelper = $historyHelper;
+        $this->timeTravel = $timeTravel;
+        $this->dataTableFactory = $dataTableFactory;
     }
 
 
-    protected function _edit(AbstractNamedDBElement $entity, Request $request, EntityManagerInterface $em) : Response
+    protected function _edit(AbstractNamedDBElement $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null) : Response
     {
         $this->denyAccessUnlessGranted('read', $entity);
 
-        $form = $this->createForm($this->form_class, $entity, ['attachment_class' => $this->attachment_class]);
+
+        $timeTravel_timestamp = null;
+        if ($timestamp !== null) {
+            $this->denyAccessUnlessGranted('@tools.timeTravel');
+            $this->denyAccessUnlessGranted('show_history', $entity);
+            //If the timestamp only contains numbers interpret it as unix timestamp
+            if (ctype_digit($timestamp)) {
+                $timeTravel_timestamp = new \DateTime();
+                $timeTravel_timestamp->setTimestamp((int) $timestamp);
+            } else { //Try to parse it via DateTime
+                $timeTravel_timestamp = new \DateTime($timestamp);
+            }
+            $this->timeTravel->revertEntityToTimestamp($entity, $timeTravel_timestamp);
+        }
+
+        if ($this->isGranted('show_history', $entity) ) {
+            $table = $this->dataTableFactory->createFromType(
+                LogDataTable::class,
+                [
+                    'filter_elements' => $this->historyHelper->getAssociatedElements($entity),
+                    'mode' => 'element_history'
+                ],
+                ['pageLength' => 10]
+            )
+                ->handleRequest($request);
+
+            if ($table->isCallback()) {
+                return $table->getResponse();
+            }
+        } else {
+            $table = null;
+        }
+
+        $form = $this->createForm($this->form_class, $entity, [
+            'attachment_class' => $this->attachment_class,
+            'disabled' => $timeTravel_timestamp !== null ? true : null
+        ]);
 
         $form->handleRequest($request);
         if ($form->isSubmitted() && $form->isValid()) {
@@ -131,6 +183,8 @@ abstract class BaseAdminController extends AbstractController
                 }
             }
 
+            $this->commentHelper->setMessage($form['log_comment']->getData());
+
             $em->persist($entity);
             $em->flush();
             $this->addFlash('success', 'entity.edit_flash');
@@ -146,6 +200,9 @@ abstract class BaseAdminController extends AbstractController
             'entity' => $entity,
             'form' => $form->createView(),
             'attachment_helper' => $this->attachmentHelper,
+            'route_base' => $this->route_base,
+            'datatable' => $table,
+            'timeTravel' => $timeTravel_timestamp
         ]);
     }
 
@@ -188,6 +245,8 @@ abstract class BaseAdminController extends AbstractController
                 }
             }
 
+            $this->commentHelper->setMessage($form['log_comment']->getData());
+
             $em->persist($new_entity);
             $em->flush();
             $this->addFlash('success', 'entity.created_flash');
@@ -215,6 +274,10 @@ abstract class BaseAdminController extends AbstractController
                 'csv_separator' => $data['csv_separator'],
             ];
 
+            $this->commentHelper->setMessage('Import ' . $file->getClientOriginalName());
+
+
+
             $errors = $importer->fileToDBEntities($file, $this->entity_class, $options);
 
             foreach ($errors as $name => $error) {
@@ -252,6 +315,7 @@ abstract class BaseAdminController extends AbstractController
             'import_form' => $import_form->createView(),
             'mass_creation_form' => $mass_creation_form->createView(),
             'attachment_helper' => $this->attachmentHelper,
+            'route_base' => $this->route_base,
         ]);
     }
 
@@ -280,6 +344,8 @@ abstract class BaseAdminController extends AbstractController
                 $entityManager->remove($entity);
             }
 
+            $this->commentHelper->setMessage($request->request->get('log_comment', null));
+
             //Flush changes
             $entityManager->flush();
 

src/Controller/AdminPages/CategoryController.php

@@ -79,7 +79,7 @@ class CategoryController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="category_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="category_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      *
      * @param  Category  $entity
@@ -87,9 +87,9 @@ class CategoryController extends BaseAdminController
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Category $entity, Request $request, EntityManagerInterface $em): Response
+    public function edit(Category $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null): Response
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/CurrencyController.php

@@ -81,7 +81,7 @@ class CurrencyController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="currency_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="currency_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      *
      * @param  Currency  $entity
@@ -89,9 +89,9 @@ class CurrencyController extends BaseAdminController
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Currency $entity, Request $request, EntityManagerInterface $em): Response
+    public function edit(Currency $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null): Response
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/DeviceController.php

@@ -79,7 +79,7 @@ class DeviceController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="device_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="device_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      *
      * @param  Device  $entity
@@ -87,9 +87,9 @@ class DeviceController extends BaseAdminController
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Device $entity, Request $request, EntityManagerInterface $em): Response
+    public function edit(Device $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null): Response
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/FootprintController.php

@@ -78,16 +78,16 @@ class FootprintController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="footprint_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="footprint_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      * @param  Footprint  $entity
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Footprint $entity, Request $request, EntityManagerInterface $em)
+    public function edit(Footprint $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/ManufacturerController.php

@@ -77,16 +77,16 @@ class ManufacturerController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="manufacturer_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="manufacturer_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      * @param  Manufacturer  $entity
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Manufacturer $entity, Request $request, EntityManagerInterface $em)
+    public function edit(Manufacturer $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/MeasurementUnitController.php

@@ -78,16 +78,16 @@ class MeasurementUnitController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="measurement_unit_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="measurement_unit_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      * @param  MeasurementUnit  $entity
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(MeasurementUnit $entity, Request $request, EntityManagerInterface $em)
+    public function edit(MeasurementUnit $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/StorelocationController.php

@@ -76,16 +76,16 @@ class StorelocationController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="store_location_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="store_location_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      * @param  Storelocation  $entity
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Storelocation $entity, Request $request, EntityManagerInterface $em)
+    public function edit(Storelocation $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/AdminPages/SupplierController.php

@@ -77,16 +77,16 @@ class SupplierController extends BaseAdminController
     }
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="supplier_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="supplier_edit")
      * @Route("/{id}", requirements={"id"="\d+"})
      * @param  Supplier  $entity
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Supplier $entity, Request $request, EntityManagerInterface $em)
+    public function edit(Supplier $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/GroupController.php

@@ -67,7 +67,7 @@ class GroupController extends BaseAdminController
     protected $attachment_class = GroupAttachment::class;
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="group_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="group_edit")
      * @Route("/{id}/", requirements={"id"="\d+"})
      *
      * @param  Group  $entity
@@ -75,9 +75,9 @@ class GroupController extends BaseAdminController
      * @param  EntityManagerInterface  $em
      * @return Response
      */
-    public function edit(Group $entity, Request $request, EntityManagerInterface $em): Response
+    public function edit(Group $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null): Response
     {
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/Controller/HomepageController.php

@@ -42,7 +42,11 @@ declare(strict_types=1);
 
 namespace App\Controller;
 
+use App\DataTables\LogDataTable;
 use App\Services\GitVersionInfo;
+use Omines\DataTablesBundle\DataTableFactory;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use const DIRECTORY_SEPARATOR;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpKernel\KernelInterface;
@@ -53,11 +57,13 @@ class HomepageController extends AbstractController
 {
     protected $cache;
     protected $kernel;
+    protected $dataTable;
 
-    public function __construct(CacheInterface $cache, KernelInterface $kernel)
+    public function __construct(CacheInterface $cache, KernelInterface $kernel, DataTableFactory $dataTable)
     {
         $this->cache = $cache;
         $this->kernel = $kernel;
+        $this->dataTable = $dataTable;
     }
 
     public function getBanner(): string
@@ -78,12 +84,30 @@ class HomepageController extends AbstractController
      * @param  GitVersionInfo  $versionInfo
      * @return \Symfony\Component\HttpFoundation\Response
      */
-    public function homepage(GitVersionInfo $versionInfo): \Symfony\Component\HttpFoundation\Response
+    public function homepage(Request $request, GitVersionInfo $versionInfo): Response
     {
+        if ($this->isGranted("@tools.lastActivity")) {
+            $table = $this->dataTable->createFromType(
+                LogDataTable::class,
+                [
+                    'mode' => 'last_activity'
+                ],
+                ['pageLength' => 10]
+            )
+                ->handleRequest($request);
+
+            if ($table->isCallback()) {
+                return $table->getResponse();
+            }
+        } else {
+            $table = null;
+        }
+
         return $this->render('homepage.html.twig', [
             'banner' => $this->getBanner(),
             'git_branch' => $versionInfo->getGitBranchName(),
             'git_commit' => $versionInfo->getGitCommitHash(),
+            'datatable' => $table
         ]);
     }
 }

src/Controller/LogController.php

@@ -43,9 +43,20 @@ declare(strict_types=1);
 namespace App\Controller;
 
 use App\DataTables\LogDataTable;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
+use App\Entity\LogSystem\ElementCreatedLogEntry;
+use App\Entity\LogSystem\ElementDeletedLogEntry;
+use App\Entity\LogSystem\ElementEditedLogEntry;
+use App\Services\LogSystem\EventUndoHelper;
+use App\Services\LogSystem\TimeTravel;
+use Doctrine\ORM\EntityManagerInterface;
 use Omines\DataTablesBundle\DataTableFactory;
+use phpDocumentor\Reflection\Element;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Annotation\Route;
@@ -55,6 +66,18 @@ use Symfony\Component\Routing\Annotation\Route;
  */
 class LogController extends AbstractController
 {
+    protected $entityManager;
+    protected $timeTravel;
+    protected $dbRepository;
+
+
+    public function __construct(EntityManagerInterface $entityManager, TimeTravel $timeTravel)
+    {
+        $this->entityManager = $entityManager;
+        $this->timeTravel = $timeTravel;
+        $this->dbRepository = $entityManager->getRepository(AbstractDBElement::class);
+    }
+
     /**
      * @Route("/", name="log_view")
      *
@@ -77,4 +100,107 @@ class LogController extends AbstractController
             'datatable' => $table,
         ]);
     }
+
+    /**
+     * @Route("/undo", name="log_undo", methods={"POST"})
+     * @param  Request  $request
+     */
+    public function undoRevertLog(Request $request, EventUndoHelper $eventUndoHelper)
+    {
+        $mode = EventUndoHelper::MODE_UNDO;
+        $id = $request->request->get('undo');
+
+        //If no undo value was set check if a revert was set
+        if ($id === null) {
+            $id = $request->get('revert');
+            $mode = EventUndoHelper::MODE_REVERT;
+        }
+
+        $log_element = $this->entityManager->find(AbstractLogEntry::class, $id);
+        if ($log_element === null) {
+            throw new \InvalidArgumentException('No log entry with the given ID is existing!');
+        }
+
+        $this->denyAccessUnlessGranted('revert_element', $log_element->getTargetClass());
+
+        $eventUndoHelper->setMode($mode);
+        $eventUndoHelper->setUndoneEvent($log_element);
+
+        if ($mode === EventUndoHelper::MODE_UNDO) {
+            $this->undoLog($log_element);
+        } elseif ($mode === EventUndoHelper::MODE_REVERT) {
+            $this->revertLog($log_element);
+        }
+
+        $eventUndoHelper->clearUndoneEvent();
+
+        $redirect = $request->request->get('redirect_back');
+        return $this->redirect($redirect);
+    }
+
+    protected function revertLog(AbstractLogEntry $logEntry): void
+    {
+        $timestamp = $logEntry->getTimestamp();
+        $element = $this->entityManager->find($logEntry->getTargetClass(), $logEntry->getTargetID());
+        //If the element is not available in DB try to undelete it
+        if ($element === null) {
+            $element = $this->timeTravel->undeleteEntity($logEntry->getTargetClass(), $logEntry->getTargetID());
+            $this->entityManager->persist($element);
+            $this->entityManager->flush();
+            $this->dbRepository->changeID($element, $logEntry->getTargetID());
+        }
+
+        if (!$element instanceof AbstractDBElement) {
+            $this->addFlash('error', 'log.undo.target_not_found');
+            return;
+        }
+
+        $this->timeTravel->revertEntityToTimestamp($element, $timestamp);
+        $this->entityManager->flush();
+        $this->addFlash('success', 'log.undo.revert_success');
+    }
+
+    protected function undoLog(AbstractLogEntry $log_element): void
+    {
+        if ($log_element instanceof ElementDeletedLogEntry || $log_element instanceof CollectionElementDeleted) {
+            if ($log_element instanceof ElementDeletedLogEntry) {
+                $element_class = $log_element->getTargetClass();
+                $element_id = $log_element->getTargetID();
+            } else {
+                $element_class = $log_element->getDeletedElementClass();
+                $element_id = $log_element->getDeletedElementID();
+            }
+
+            //Check if the element we want to undelete already exits
+            if ($this->entityManager->find($element_class, $element_id) == null) {
+                $undeleted_element = $this->timeTravel->undeleteEntity($element_class, $element_id);
+                $this->entityManager->persist($undeleted_element);
+                $this->entityManager->flush();
+                $this->dbRepository->changeID($undeleted_element, $element_id);
+                $this->addFlash('success', 'log.undo.element_undelete_success');
+            } else {
+                $this->addFlash('warning', 'log.undo.element_element_already_undeleted');
+            }
+        } elseif ($log_element instanceof ElementCreatedLogEntry) {
+            $element = $this->entityManager->find($log_element->getTargetClass(), $log_element->getTargetID());
+            if ($element !== null) {
+                $this->entityManager->remove($element);
+                $this->entityManager->flush();
+                $this->addFlash('success', 'log.undo.element_delete_success');
+            } else {
+                $this->addFlash('warning', 'log.undo.element.element_already_delted');
+            }
+        } elseif ($log_element instanceof ElementEditedLogEntry) {
+            $element = $this->entityManager->find($log_element->getTargetClass(), $log_element->getTargetID());
+            if ($element instanceof AbstractDBElement) {
+                $this->timeTravel->applyEntry($element, $log_element);
+                $this->entityManager->flush();
+                $this->addFlash('success', 'log.undo.element_change_undone');
+            } else {
+                $this->addFlash('error', 'log.undo.do_undelete_before');
+            }
+        } else {
+            $this->addFlash('error', 'log.undo.log_type_invalid');
+        }
+    }
 }

src/Controller/PartController.php

@@ -42,6 +42,7 @@ declare(strict_types=1);
 
 namespace App\Controller;
 
+use App\DataTables\LogDataTable;
 use App\Entity\Parts\Category;
 use App\Entity\Parts\Part;
 use App\Exceptions\AttachmentDownloadException;
@@ -49,8 +50,12 @@ use App\Form\Part\PartBaseType;
 use App\Services\Attachments\AttachmentManager;
 use App\Services\Attachments\AttachmentSubmitHandler;
 use App\Services\Attachments\PartPreviewGenerator;
+use App\Services\LogSystem\EventCommentHelper;
+use App\Services\LogSystem\HistoryHelper;
+use App\Services\LogSystem\TimeTravel;
 use App\Services\PricedetailHelper;
 use Doctrine\ORM\EntityManagerInterface;
+use Omines\DataTablesBundle\DataTableFactory;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\RedirectResponse;
@@ -64,27 +69,70 @@ use Symfony\Contracts\Translation\TranslatorInterface;
  */
 class PartController extends AbstractController
 {
+    protected $attachmentManager;
+    protected $pricedetailHelper;
+    protected $partPreviewGenerator;
+    protected $commentHelper;
+
+    public function __construct(AttachmentManager $attachmentManager, PricedetailHelper $pricedetailHelper,
+        PartPreviewGenerator $partPreviewGenerator, EventCommentHelper $commentHelper)
+    {
+        $this->attachmentManager = $attachmentManager;
+        $this->pricedetailHelper = $pricedetailHelper;
+        $this->partPreviewGenerator = $partPreviewGenerator;
+        $this->commentHelper = $commentHelper;
+    }
+
     /**
-     * @Route("/{id}/info", name="part_info")
+     * @Route("/{id}/info/{timestamp}", name="part_info")
      * @Route("/{id}", requirements={"id"="\d+"})
      *
      * @param  Part  $part
-     * @param  AttachmentManager  $attachmentHelper
-     * @param  PricedetailHelper  $pricedetailHelper
-     * @param  PartPreviewGenerator  $previewGenerator
      * @return Response
+     * @throws \Exception
      */
-    public function show(Part $part, AttachmentManager $attachmentHelper, PricedetailHelper $pricedetailHelper, PartPreviewGenerator $previewGenerator): Response
+    public function show(Part $part, Request $request, TimeTravel $timeTravel, HistoryHelper $historyHelper,
+        DataTableFactory $dataTable, ?string $timestamp = null): Response
     {
         $this->denyAccessUnlessGranted('read', $part);
 
+        $timeTravel_timestamp = null;
+        if ($timestamp !== null) {
+            $this->denyAccessUnlessGranted('@tools.timeTravel');
+            $this->denyAccessUnlessGranted('show_history', $part);
+            //If the timestamp only contains numbers interpret it as unix timestamp
+            if (ctype_digit($timestamp)) {
+                $timeTravel_timestamp = new \DateTime();
+                $timeTravel_timestamp->setTimestamp((int) $timestamp);
+            } else { //Try to parse it via DateTime
+                $timeTravel_timestamp = new \DateTime($timestamp);
+            }
+            $timeTravel->revertEntityToTimestamp($part, $timeTravel_timestamp);
+        }
+
+        if ($this->isGranted('show_history', $part) ) {
+            $table = $dataTable->createFromType(LogDataTable::class, [
+                'filter_elements' => $historyHelper->getAssociatedElements($part),
+                'mode' => 'element_history'
+            ], ['pageLength' => 10])
+                ->handleRequest($request);
+
+            if ($table->isCallback()) {
+                return $table->getResponse();
+            }
+        } else {
+            $table = null;
+        }
+
         return $this->render(
             'Parts/info/show_part_info.html.twig',
             [
                 'part' => $part,
-                'attachment_helper' => $attachmentHelper,
-                'pricedetail_helper' => $pricedetailHelper,
-                'pictures' => $previewGenerator->getPreviewAttachments($part),
+                'datatable' => $table,
+                'attachment_helper' => $this->attachmentManager,
+                'pricedetail_helper' => $this->pricedetailHelper,
+                'pictures' => $this->partPreviewGenerator->getPreviewAttachments($part),
+                'timeTravel' => $timeTravel_timestamp
             ]
         );
     }
@@ -96,12 +144,11 @@ class PartController extends AbstractController
      * @param  Request  $request
      * @param  EntityManagerInterface  $em
      * @param  TranslatorInterface  $translator
-     * @param  AttachmentManager  $attachmentHelper
      * @param  AttachmentSubmitHandler  $attachmentSubmitHandler
      * @return Response
      */
     public function edit(Part $part, Request $request, EntityManagerInterface $em, TranslatorInterface $translator,
-                         AttachmentManager $attachmentHelper, AttachmentSubmitHandler $attachmentSubmitHandler): Response
+        AttachmentSubmitHandler $attachmentSubmitHandler): Response
     {
         $this->denyAccessUnlessGranted('edit', $part);
 
@@ -128,6 +175,8 @@ class PartController extends AbstractController
                 }
             }
 
+            $this->commentHelper->setMessage($form['log_comment']->getData());
+
             $em->persist($part);
             $em->flush();
             $this->addFlash('info', 'part.edited_flash');
@@ -138,11 +187,11 @@ class PartController extends AbstractController
         }
 
         return $this->render('Parts/edit/edit_part_info.html.twig',
-            [
-                'part' => $part,
-                'form' => $form->createView(),
-                'attachment_helper' => $attachmentHelper,
-            ]);
+                             [
+                                 'part' => $part,
+                                 'form' => $form->createView(),
+                                 'attachment_helper' => $this->attachmentManager,
+                             ]);
     }
 
     /**
@@ -159,6 +208,8 @@ class PartController extends AbstractController
         if ($this->isCsrfTokenValid('delete'.$part->getId(), $request->request->get('_token'))) {
             $entityManager = $this->getDoctrine()->getManager();
 
+            $this->commentHelper->setMessage($request->request->get('log_comment', null));
+
             //Remove part
             $entityManager->remove($part);
 
@@ -182,7 +233,7 @@ class PartController extends AbstractController
      * @return Response
      */
     public function new(Request $request, EntityManagerInterface $em, TranslatorInterface $translator,
-                        AttachmentManager $attachmentHelper, AttachmentSubmitHandler $attachmentSubmitHandler): Response
+        AttachmentManager $attachmentHelper, AttachmentSubmitHandler $attachmentSubmitHandler): Response
     {
         $new_part = new Part();
 
@@ -219,6 +270,8 @@ class PartController extends AbstractController
                 }
             }
 
+            $this->commentHelper->setMessage($form['log_comment']->getData());
+
             $em->persist($new_part);
             $em->flush();
             $this->addFlash('success', 'part.created_flash');
@@ -231,11 +284,11 @@ class PartController extends AbstractController
         }
 
         return $this->render('Parts/edit/new_part.html.twig',
-            [
-                'part' => $new_part,
-                'form' => $form->createView(),
-                'attachment_helper' => $attachmentHelper,
-            ]);
+                             [
+                                 'part' => $new_part,
+                                 'form' => $form->createView(),
+                                 'attachment_helper' => $attachmentHelper,
+                             ]);
     }
 
     /**
@@ -267,9 +320,9 @@ class PartController extends AbstractController
         }
 
         return $this->render('Parts/edit/new_part.html.twig',
-            [
-                'part' => $new_part,
-                'form' => $form->createView(),
-            ]);
+                             [
+                                 'part' => $new_part,
+                                 'form' => $form->createView(),
+                             ]);
     }
 }

src/Controller/UserController.php

@@ -69,7 +69,7 @@ class UserController extends AdminPages\BaseAdminController
     protected $attachment_class = UserAttachment::class;
 
     /**
-     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="user_edit")
+     * @Route("/{id}/edit/{timestamp}", requirements={"id"="\d+"}, name="user_edit")
      * @Route("/{id}/", requirements={"id"="\d+"})
      * @param  User  $entity
      * @param  Request  $request
@@ -77,7 +77,7 @@ class UserController extends AdminPages\BaseAdminController
      * @return Response
      * @throws \Exception
      */
-    public function edit(User $entity, Request $request, EntityManagerInterface $em)
+    public function edit(User $entity, Request $request, EntityManagerInterface $em, ?string $timestamp = null)
     {
         //Handle 2FA disabling
 
@@ -102,7 +102,7 @@ class UserController extends AdminPages\BaseAdminController
             }
         }
 
-        return $this->_edit($entity, $request, $em);
+        return $this->_edit($entity, $request, $em, $timestamp);
     }
 
     /**

src/DataTables/Column/IconLinkColumn.php

@@ -0,0 +1,126 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\DataTables\Column;
+
+
+use Omines\DataTablesBundle\Column\AbstractColumn;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class IconLinkColumn extends AbstractColumn
+{
+
+    /**
+     * @inheritDoc
+     */
+    public function normalize($value)
+    {
+        return $value;
+    }
+
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        parent::configureOptions($resolver);
+        $resolver->setDefaults([
+                                   'icon' => 'fas fa-fw fa-edit',
+                                   'title' => null,
+                                   'href' => null,
+                                   'disabled' => false,
+                               ]);
+
+        $resolver->setAllowedTypes('title', ['null', 'string', 'callable']);
+        $resolver->setAllowedTypes('icon', ['null', 'string', 'callable']);
+        $resolver->setAllowedTypes('href', ['null', 'string', 'callable']);
+        $resolver->setAllowedTypes('disabled', ['bool', 'callable']);
+
+        return $this;
+    }
+
+    public function render($value, $context)
+    {
+        $href = $this->getHref($value, $context);
+        $icon = $this->getIcon($value, $context);
+        $title = $this->getTitle($value, $context);
+        $disabled = $this->getDisabled($value, $context);
+
+        if ($href !== null) {
+            return sprintf(
+                '<a class="btn btn-primary btn-sm %s" href="%s" title="%s"><i class="%s"></i></a>',
+                $disabled ? 'disabled' : '',
+                $href,
+                $title,
+                $icon
+            );
+        }
+
+        return "";
+    }
+
+    protected function getDisabled($value, $context): bool
+    {
+        $provider = $this->options['disabled'];
+        if (is_bool($provider)) {
+            return $provider;
+        }
+        if (is_callable($provider)) {
+            return call_user_func($provider, $value, $context);
+        }
+        return false;
+    }
+
+    protected function getHref($value, $context): ?string
+    {
+        $provider = $this->options['href'];
+        if (is_string($provider)) {
+            return $provider;
+        }
+        if (is_callable($provider)) {
+            return call_user_func($provider, $value, $context);
+        }
+
+        return null;
+    }
+
+    protected function getIcon($value, $context): ?string
+    {
+        $provider = $this->options['icon'];
+        if (is_string($provider)) {
+            return $provider;
+        }
+        if (is_callable($provider)) {
+            return call_user_func($provider, $value, $context);
+        }
+
+        return null;
+    }
+
+    protected function getTitle($value, $context): ?string
+    {
+        $provider = $this->options['title'];
+        if (is_string($provider)) {
+            return $provider;
+        }
+        if (is_callable($provider)) {
+            return call_user_func($provider, $value, $context);
+        }
+
+        return null;
+    }
+}

src/DataTables/Column/RevertLogColumn.php

@@ -0,0 +1,93 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\DataTables\Column;
+
+
+use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
+use App\Entity\LogSystem\ElementCreatedLogEntry;
+use App\Entity\LogSystem\ElementDeletedLogEntry;
+use App\Entity\LogSystem\ElementEditedLogEntry;
+use Omines\DataTablesBundle\Column\AbstractColumn;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Contracts\Translation\TranslatorInterface;
+
+class RevertLogColumn extends AbstractColumn
+{
+    protected $translator;
+    protected $security;
+
+    public function __construct(TranslatorInterface $translator, Security $security)
+    {
+        $this->translator = $translator;
+        $this->security = $security;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function normalize($value)
+    {
+        return $value;
+    }
+
+    public function render($value, $context)
+    {
+        $revertable = true;
+        if (
+            $context instanceof CollectionElementDeleted
+            || ($context instanceof ElementDeletedLogEntry && $context->hasOldDataInformations())
+        ) {
+            $icon = 'fa-trash-restore';
+            $title = $this->translator->trans('log.undo.undelete');
+        } elseif (
+            $context instanceof ElementCreatedLogEntry
+            || ($context instanceof ElementEditedLogEntry && $context->hasOldDataInformations())
+        ) {
+            $icon = 'fa-undo';
+            $title = $this->translator->trans('log.undo.undo');
+        } else {
+            return '';
+        }
+
+        $disabled = !$this->security->isGranted('revert_element', $context->getTargetClass());
+
+        $tmp = '<div class="btn-group btn-group-sm">';
+        $tmp .= sprintf(
+            '<button type="submit" class="btn btn-outline-secondary" name="undo" value="%d" %s><i class="fas fa-fw %s" title="%s"></i></button>',
+            $context->getID(),
+            $disabled ? 'disabled' : '',
+            $icon,
+            $title
+        );
+
+        $tmp .= sprintf(
+            '<button type="submit" class="btn btn-outline-secondary" name="revert" value="%d" %s><i class="fas fa-fw fa-backward" title="%s"></i></button>',
+            $context->getID(),
+            $disabled ? 'disabled' : '',
+            $this->translator->trans('log.undo.revert')
+        );
+
+        $tmp .= '</div>';
+
+        return $tmp;
+    }
+}

src/DataTables/LogDataTable.php

@@ -42,36 +42,73 @@ declare(strict_types=1);
 
 namespace App\DataTables;
 
+use App\DataTables\Column\IconLinkColumn;
 use App\DataTables\Column\LocaleDateTimeColumn;
 use App\DataTables\Column\LogEntryExtraColumn;
 use App\DataTables\Column\LogEntryTargetColumn;
+use App\DataTables\Column\RevertLogColumn;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Contracts\TimeTravelInterface;
 use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
+use App\Entity\LogSystem\ElementCreatedLogEntry;
+use App\Entity\LogSystem\ElementDeletedLogEntry;
+use App\Entity\LogSystem\ElementEditedLogEntry;
+use App\Entity\UserSystem\Group;
+use App\Entity\UserSystem\User;
+use App\Exceptions\EntityNotSupportedException;
 use App\Services\ElementTypeNameGenerator;
+use App\Services\EntityURLGenerator;
+use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\QueryBuilder;
 use Omines\DataTablesBundle\Adapter\Doctrine\ORMAdapter;
 use Omines\DataTablesBundle\Column\TextColumn;
 use Omines\DataTablesBundle\DataTable;
 use Omines\DataTablesBundle\DataTableTypeInterface;
 use Psr\Log\LogLevel;
+use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Security\Core\Security;
 use Symfony\Contracts\Translation\TranslatorInterface;
+use Symfony\Flex\Options;
 
 class LogDataTable implements DataTableTypeInterface
 {
     protected $elementTypeNameGenerator;
     protected $translator;
     protected $urlGenerator;
+    protected $entityURLGenerator;
+    protected $logRepo;
+    protected $security;
 
     public function __construct(ElementTypeNameGenerator $elementTypeNameGenerator, TranslatorInterface $translator,
-        UrlGeneratorInterface $urlGenerator)
+        UrlGeneratorInterface $urlGenerator, EntityURLGenerator $entityURLGenerator, EntityManagerInterface $entityManager, Security $security)
     {
         $this->elementTypeNameGenerator = $elementTypeNameGenerator;
         $this->translator = $translator;
         $this->urlGenerator = $urlGenerator;
+        $this->entityURLGenerator = $entityURLGenerator;
+        $this->logRepo = $entityManager->getRepository(AbstractLogEntry::class);
+        $this->security = $security;
+    }
+
+    public function configureOptions(OptionsResolver $optionsResolver)
+    {
+        $optionsResolver->setDefaults([
+                                          'mode' => 'system_log',
+                                          'filter_elements' => [],
+                                      ]);
+
+        $optionsResolver->setAllowedValues('mode', ['system_log', 'element_history', 'last_activity']);
     }
 
     public function configure(DataTable $dataTable, array $options): void
     {
+        $resolver = new OptionsResolver();
+        $this->configureOptions($resolver);
+        $options = $resolver->resolve($options);
+
+
         $dataTable->add('symbol', TextColumn::class, [
             'label' => '',
             'render' => function ($value, AbstractLogEntry $context) {
@@ -114,7 +151,11 @@ class LogDataTable implements DataTableTypeInterface
                         break;
                 }
 
-                return sprintf('<i class="fas fa-fw %s"></i>', $symbol);
+                return sprintf(
+                    '<i class="fas fa-fw %s" title="%s"></i>',
+                    $symbol,
+                    $context->getLevelString()
+                );
             },
         ]);
 
@@ -138,6 +179,7 @@ class LogDataTable implements DataTableTypeInterface
 
         $dataTable->add('level', TextColumn::class, [
             'label' => $this->translator->trans('log.level'),
+            'visible' => $options['mode'] === 'system_log',
             'propertyPath' => 'levelString',
             'render' => function (string $value, AbstractLogEntry $context) {
                 return $value;
@@ -178,21 +220,77 @@ class LogDataTable implements DataTableTypeInterface
             'label' => $this->translator->trans('log.extra'),
         ]);
 
+        $dataTable->add('timeTravel', IconLinkColumn::class,[
+            'label' => '',
+            'icon' => 'fas fa-fw fa-eye',
+            'href' => function ($value, AbstractLogEntry $context) {
+                if (
+                    ($context instanceof TimeTravelInterface
+                        && $context->hasOldDataInformations())
+                    || $context instanceof CollectionElementDeleted
+                ) {
+                    try {
+                        $target = $this->logRepo->getTargetElement($context);
+                        if($target !== null) {
+                            $str = $this->entityURLGenerator->timeTravelURL($target, $context->getTimestamp());
+                            return $str;
+                        }
+                    } catch (EntityNotSupportedException $exception) {
+                        return null;
+                    }
+                }
+                return null;
+            },
+            'disabled' => function ($value, AbstractLogEntry $context) {
+                return
+                    !$this->security->isGranted('@tools.timetravel')
+                    || !$this->security->isGranted('show_history', $context->getTargetClass());
+            }
+
+        ]);
+
+        $dataTable->add('actionRevert', RevertLogColumn::class, [
+            'label' => ''
+        ]);
+
         $dataTable->addOrderBy('timestamp', DataTable::SORT_DESCENDING);
 
         $dataTable->createAdapter(ORMAdapter::class, [
             'entity' => AbstractLogEntry::class,
-            'query' => function (QueryBuilder $builder): void {
-                $this->getQuery($builder);
+            'query' => function (QueryBuilder $builder) use ($options): void {
+                $this->getQuery($builder, $options);
             },
         ]);
     }
 
-    protected function getQuery(QueryBuilder $builder): void
+    protected function getQuery(QueryBuilder $builder, array $options): void
     {
         $builder->distinct()->select('log')
             ->addSelect('user')
             ->from(AbstractLogEntry::class, 'log')
             ->leftJoin('log.user', 'user');
+
+        if ($options['mode'] === 'last_activity') {
+            $builder->where('log INSTANCE OF ' . ElementCreatedLogEntry::class)
+                ->orWhere('log INSTANCE OF ' . ElementDeletedLogEntry::class)
+                ->orWhere('log INSTANCE OF ' . ElementEditedLogEntry::class)
+                ->orWhere('log INSTANCE OF ' . CollectionElementDeleted::class)
+                ->andWhere('log.target_type NOT IN (:disallowed)');;
+
+            $builder->setParameter('disallowed', [
+                AbstractLogEntry::targetTypeClassToID(User::class),
+                AbstractLogEntry::targetTypeClassToID(Group::class),
+            ]);
+        }
+
+        if (!empty($options['filter_elements'])) {
+            foreach ($options['filter_elements'] as $element) {
+                /** @var AbstractDBElement $element */
+
+                $target_type = AbstractLogEntry::targetTypeClassToID(get_class($element));
+                $target_id = $element->getID();
+                $builder->orWhere("log.target_type = $target_type AND log.target_id = $target_id");
+            }
+        }
     }
 }

src/Entity/Base/AbstractDBElement.php

@@ -34,7 +34,7 @@ use Symfony\Component\Serializer\Annotation\Groups;
  * Every database table which are managed with this class (or a subclass of it)
  *          must have the table row "id"!! The ID is the unique key to identify the elements.
  *
- * @ORM\MappedSuperclass()
+ * @ORM\MappedSuperclass(repositoryClass="App\Repository\DBElementRepository")
  *
  * @ORM\EntityListeners({"App\Security\EntityListeners\ElementPermissionListener"})
  *
@@ -55,7 +55,7 @@ use Symfony\Component\Serializer\Annotation\Groups;
  *      "user" = "App\Entity\User"
  *  })
  */
-abstract class AbstractDBElement
+abstract class AbstractDBElement implements \JsonSerializable
 {
     /** @var int|null The Identification number for this part. This value is unique for the element in this table.
      * Null if the element is not saved to DB yet.
@@ -92,4 +92,9 @@ abstract class AbstractDBElement
      * @return string The ID as a string;
      */
     abstract public function getIDString(): string;
+
+    public function jsonSerialize()
+    {
+        return ['@id' => $this->getID()];
+    }
 }

src/Entity/Base/AbstractNamedDBElement.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 namespace App\Entity\Base;
 
 use App\Entity\Contracts\NamedElementInterface;
+use App\Entity\Contracts\TimeStampableInterface;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Serializer\Annotation\Groups;
 use Symfony\Component\Validator\Constraints as Assert;
@@ -30,10 +31,10 @@ use Symfony\Component\Validator\Constraints as Assert;
 /**
  * All subclasses of this class have an attribute "name".
  *
- * @ORM\MappedSuperclass(repositoryClass="App\Repository\UserRepository")
+ * @ORM\MappedSuperclass(repositoryClass="App\Repository\NamedDBElement")
  * @ORM\HasLifecycleCallbacks()
  */
-abstract class AbstractNamedDBElement extends AbstractDBElement implements NamedElementInterface
+abstract class AbstractNamedDBElement extends AbstractDBElement implements NamedElementInterface, TimeStampableInterface
 {
     use TimestampTrait;
 

src/Entity/Contracts/LogWithCommentInterface.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Entity\Contracts;
+
+
+interface LogWithCommentInterface
+{
+    /**
+     * Checks if this log entry has a user provided comment.
+     * @return bool
+     */
+    public function hasComment(): bool;
+
+    /**
+     * Gets the user provided comment associated with this log entry.
+     * Returns null if not comment was set.
+     * @return string|null
+     */
+    public function getComment(): ?string;
+
+    /**
+     * Sets the user provided comment associated with this log entry.
+     * @param  string|null  $new_comment
+     * @return $this
+     */
+    public function setComment(?string $new_comment): self;
+}

src/Entity/Contracts/LogWithEventUndoInterface.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Entity\Contracts;
+
+
+use App\Entity\LogSystem\AbstractLogEntry;
+
+interface LogWithEventUndoInterface
+{
+    /**
+     * Checks if this element undoes another event.
+     * @return bool
+     */
+    public function isUndoEvent(): bool;
+
+    /**
+     * Returns the ID of the undone event or null if no event is undone.
+     * @return int|null
+     */
+    public function getUndoEventID(): ?int;
+
+    /**
+     * Sets the event that is undone, and the undo mode.
+     * @param  AbstractLogEntry  $event
+     * @param  string  $mode
+     * @return $this
+     */
+    public function setUndoneEvent(AbstractLogEntry $event, string $mode = 'undo'): self;
+
+    /**
+     * Returns the mode how the event was undone:
+     * "undo" = Only a single event was applied to element
+     * "revert" = Element was reverted to the state it was to the timestamp of the log.
+     * @return string
+     */
+    public function getUndoMode(): string;
+}

src/Entity/Contracts/TimeStampableInterface.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+namespace App\Entity\Contracts;
+
+
+use DateTime;
+
+interface TimeStampableInterface
+{
+    /**
+     * Returns the last time when the element was modified.
+     * Returns null if the element was not yet saved to DB yet.
+     *
+     * @return DateTime|null the time of the last edit
+     */
+    public function getLastModified(): ?DateTime;
+
+    /**
+     * Returns the date/time when the element was created.
+     * Returns null if the element was not yet saved to DB yet.
+     *
+     * @return DateTime|null the creation time of the part
+     */
+    public function getAddedDate(): ?DateTime;
+}

src/Entity/Contracts/TimeTravelInterface.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+namespace App\Entity\Contracts;
+
+
+interface TimeTravelInterface
+{
+    /**
+     * Checks if this entry has informations which data has changed.
+     * @return bool True if this entry has informations about the changed data.
+     */
+    public function hasOldDataInformations(): bool;
+
+    /** Returns the data the entity had before this log entry. */
+    public function getOldData(): array;
+
+    /**
+     * Returns the the timestamp associated with this change.
+     * @return \DateTime
+     */
+    public function getTimestamp(): \DateTime;
+}

src/Entity/LogSystem/AbstractLogEntry.php

@@ -81,7 +81,8 @@ use Psr\Log\LogLevel;
  *  7 = "ElementEditedLogEntry",
  *  8 = "ConfigChangedLogEntry",
  *  9 = "InstockChangedLogEntry",
- *  10 = "DatabaseUpdatedLogEntry"
+ *  10 = "DatabaseUpdatedLogEntry",
+ *  11 = "CollectionElementDeleted"
  * })
  */
 abstract class AbstractLogEntry extends AbstractDBElement
@@ -367,6 +368,17 @@ abstract class AbstractLogEntry extends AbstractDBElement
         return $this;
     }
 
+    /**
+     * Sets the target ID of the element associated with this element.
+     * @param  int  $target_id
+     * @return $this
+     */
+    public function setTargetElementID(int $target_id): self
+    {
+        $this->target_id = $target_id;
+        return $this;
+    }
+
     public function getExtraData(): array
     {
         return $this->extra;

src/Entity/LogSystem/CollectionElementDeleted.php

@@ -0,0 +1,136 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Entity\LogSystem;
+
+
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Contracts\LogWithEventUndoInterface;
+use App\Entity\Contracts\NamedElementInterface;
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ * This log entry is created when an element is deleted, that is used in a collection of an other entity.
+ * This is needed to signal time travel, that it has to undelete the deleted entity.
+ */
+class CollectionElementDeleted extends AbstractLogEntry implements LogWithEventUndoInterface
+{
+    protected $typeString = 'collection_element_deleted';
+    protected $level = self::LEVEL_INFO;
+
+    public function __construct(AbstractDBElement $changed_element, string $collection_name, AbstractDBElement $deletedElement)
+    {
+        parent::__construct();
+
+        $this->level = self::LEVEL_INFO;
+        $this->setTargetElement($changed_element);
+        $this->extra['n'] = $collection_name;
+        $this->extra['c'] = self::targetTypeClassToID(get_class($deletedElement));
+        $this->extra['i'] = $deletedElement->getID();
+        if ($deletedElement instanceof NamedElementInterface) {
+            $this->extra['o'] = $deletedElement->getName();
+        }
+    }
+
+    /**
+     * Get the name of the collection (on target element) that was changed.
+     * @return string
+     */
+    public function getCollectionName(): string
+    {
+        return $this->extra['n'];
+    }
+
+    /**
+     * Gets the name of the element that was deleted.
+     * Return null, if the element did not have a name.
+     * @return string|null
+     */
+    public function getOldName(): ?string
+    {
+        return $this->extra['o'] ?? null;
+    }
+
+    /**
+     * Returns the class of the deleted element.
+     * @return string
+     */
+    public function getDeletedElementClass(): string
+    {
+        return self::targetTypeIdToClass($this->extra['c']);
+    }
+
+    /**
+     * Returns the ID of the deleted element.
+     * @return int
+     */
+    public function getDeletedElementID(): int
+    {
+        return $this->extra['i'];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function isUndoEvent(): bool
+    {
+        return isset($this->extra['u']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoEventID(): ?int
+    {
+        return $this->extra['u'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setUndoneEvent(AbstractLogEntry $event, string $mode = 'undo'): LogWithEventUndoInterface
+    {
+        $this->extra['u'] = $event->getID();
+
+        if ($mode === 'undo') {
+            $this->extra['um'] = 1;
+        } elseif ($mode === 'revert') {
+            $this->extra['um'] = 2;
+        } else {
+            throw new \InvalidArgumentException('Passed invalid $mode!');
+        }
+
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoMode(): string
+    {
+        $mode_int = $this->extra['um'] ?? 1;
+        if ($mode_int === 1) {
+            return 'undo';
+        } else {
+            return 'revert';
+        }
+    }
+}

src/Entity/LogSystem/ElementCreatedLogEntry.php

@@ -43,12 +43,16 @@ declare(strict_types=1);
 namespace App\Entity\LogSystem;
 
 use App\Entity\Base\AbstractDBElement;
+use App\Entity\Contracts\LogWithCommentInterface;
+use App\Entity\Contracts\LogWithEventUndoInterface;
+use App\Entity\UserSystem\Group;
+use App\Entity\UserSystem\User;
 use Doctrine\ORM\Mapping as ORM;
 
 /**
  * @ORM\Entity()
  */
-class ElementCreatedLogEntry extends AbstractLogEntry
+class ElementCreatedLogEntry extends AbstractLogEntry implements LogWithCommentInterface, LogWithEventUndoInterface
 {
     protected $typeString = 'element_created';
 
@@ -57,6 +61,11 @@ class ElementCreatedLogEntry extends AbstractLogEntry
         parent::__construct();
         $this->level = self::LEVEL_INFO;
         $this->setTargetElement($new_element);
+
+        //Creation of new users is maybe more interesting...
+        if ($new_element instanceof User || $new_element instanceof Group) {
+            $this->level = self::LEVEL_NOTICE;
+        }
     }
 
     /**
@@ -78,4 +87,76 @@ class ElementCreatedLogEntry extends AbstractLogEntry
     {
         return null !== $this->getCreationInstockValue();
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasComment(): bool
+    {
+        return isset($this->extra['m']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getComment(): ?string
+    {
+        return $this->extra['m'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setComment(?string $new_comment): LogWithCommentInterface
+    {
+        $this->extra['m'] = $new_comment;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function isUndoEvent(): bool
+    {
+        return isset($this->extra['u']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoEventID(): ?int
+    {
+        return $this->extra['u'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setUndoneEvent(AbstractLogEntry $event, string $mode = 'undo'): LogWithEventUndoInterface
+    {
+        $this->extra['u'] = $event->getID();
+
+        if ($mode === 'undo') {
+            $this->extra['um'] = 1;
+        } elseif ($mode === 'revert') {
+            $this->extra['um'] = 2;
+        } else {
+            throw new \InvalidArgumentException('Passed invalid $mode!');
+        }
+
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoMode(): string
+    {
+        $mode_int = $this->extra['um'] ?? 1;
+        if ($mode_int === 1) {
+            return 'undo';
+        } else {
+            return 'revert';
+        }
+    }
 }

src/Entity/LogSystem/ElementDeletedLogEntry.php

@@ -43,13 +43,18 @@ declare(strict_types=1);
 namespace App\Entity\LogSystem;
 
 use App\Entity\Base\AbstractDBElement;
+use App\Entity\Contracts\LogWithCommentInterface;
+use App\Entity\Contracts\LogWithEventUndoInterface;
 use App\Entity\Contracts\NamedElementInterface;
+use App\Entity\Contracts\TimeTravelInterface;
+use App\Entity\UserSystem\Group;
+use App\Entity\UserSystem\User;
 use Doctrine\ORM\Mapping as ORM;
 
 /**
  * @ORM\Entity()
  */
-class ElementDeletedLogEntry extends AbstractLogEntry
+class ElementDeletedLogEntry extends AbstractLogEntry implements TimeTravelInterface, LogWithCommentInterface, LogWithEventUndoInterface
 {
     protected $typeString = 'element_deleted';
 
@@ -58,6 +63,11 @@ class ElementDeletedLogEntry extends AbstractLogEntry
         parent::__construct();
         $this->level = self::LEVEL_INFO;
         $this->setTargetElement($deleted_element);
+
+        //Deletion of a user is maybe more interesting...
+        if ($deleted_element instanceof User || $deleted_element instanceof Group) {
+            $this->level = self::LEVEL_NOTICE;
+        }
     }
 
     /**
@@ -83,4 +93,102 @@ class ElementDeletedLogEntry extends AbstractLogEntry
     {
         return $this->extra['n'] ?? null;
     }
+
+    /**
+     * Sets the old data for this entry.
+     * @param array $old_data
+     * @return $this
+     */
+    public function setOldData(array $old_data): self
+    {
+        $this->extra['o'] = $old_data;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasOldDataInformations(): bool
+    {
+        return !empty($this->extra['o']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getOldData(): array
+    {
+        return $this->extra['o'] ?? [];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasComment(): bool
+    {
+        return isset($this->extra['m']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getComment(): ?string
+    {
+        return $this->extra['m'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setComment(?string $new_comment): LogWithCommentInterface
+    {
+        $this->extra['m'] = $new_comment;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function isUndoEvent(): bool
+    {
+        return isset($this->extra['u']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoEventID(): ?int
+    {
+        return $this->extra['u'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setUndoneEvent(AbstractLogEntry $event, string $mode = 'undo'): LogWithEventUndoInterface
+    {
+        $this->extra['u'] = $event->getID();
+
+        if ($mode === 'undo') {
+            $this->extra['um'] = 1;
+        } elseif ($mode === 'revert') {
+            $this->extra['um'] = 2;
+        } else {
+            throw new \InvalidArgumentException('Passed invalid $mode!');
+        }
+
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoMode(): string
+    {
+        $mode_int = $this->extra['um'] ?? 1;
+        if ($mode_int === 1) {
+            return 'undo';
+        }
+        return 'revert';
+    }
 }

src/Entity/LogSystem/ElementEditedLogEntry.php

@@ -43,12 +43,15 @@ declare(strict_types=1);
 namespace App\Entity\LogSystem;
 
 use App\Entity\Base\AbstractDBElement;
+use App\Entity\Contracts\LogWithCommentInterface;
+use App\Entity\Contracts\LogWithEventUndoInterface;
+use App\Entity\Contracts\TimeTravelInterface;
 use Doctrine\ORM\Mapping as ORM;
 
 /**
  * @ORM\Entity()
  */
-class ElementEditedLogEntry extends AbstractLogEntry
+class ElementEditedLogEntry extends AbstractLogEntry implements TimeTravelInterface, LogWithCommentInterface, LogWithEventUndoInterface
 {
     protected $typeString = 'element_edited';
 
@@ -61,12 +64,138 @@ class ElementEditedLogEntry extends AbstractLogEntry
     }
 
     /**
-     * Returns the message associated with this edit change.
-     *
-     * @return string
+     * Checks if this log contains infos about which fields has changed.
+     * @return bool
      */
-    public function getMessage(): string
+    public function hasChangedFieldsInfo(): bool
     {
-        return $this->extra['m'] ?? '';
+        return isset($this->extra['f']) || $this->hasOldDataInformations();
+    }
+
+    /**
+     * Return the names of all fields that were changed during the change.
+     * @return string[]
+     */
+    public function getChangedFields(): array
+    {
+        if ($this->hasOldDataInformations()) {
+            return array_keys($this->getOldData());
+        }
+
+        if (isset($this->extra['f'])) {
+            return $this->extra['f'];
+        }
+
+        return [];
+    }
+
+    /**
+     * Set the fields that were changed during this element change.
+     * @param  string[]  $changed_fields The names of the fields that were changed during the elements
+     * @return $this
+     */
+    public function setChangedFields(array $changed_fields): self
+    {
+        $this->extra['f'] = $changed_fields;
+        return $this;
+    }
+
+    /**
+     * Sets the old data for this entry.
+     * @param array $old_data
+     * @return $this
+     */
+    public function setOldData(array $old_data): self
+    {
+        $this->extra['d'] = $old_data;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasOldDataInformations(): bool
+    {
+        return !empty($this->extra['d']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getOldData(): array
+    {
+        return $this->extra['d'] ?? [];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasComment(): bool
+    {
+        return isset($this->extra['m']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getComment(): ?string
+    {
+        return $this->extra['m'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setComment(?string $new_comment): LogWithCommentInterface
+    {
+        $this->extra['m'] = $new_comment;
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function isUndoEvent(): bool
+    {
+        return isset($this->extra['u']);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoEventID(): ?int
+    {
+        return $this->extra['u'] ?? null;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function setUndoneEvent(AbstractLogEntry $event, string $mode = 'undo'): LogWithEventUndoInterface
+    {
+        $this->extra['u'] = $event->getID();
+
+        if ($mode === 'undo') {
+            $this->extra['um'] = 1;
+        } elseif ($mode === 'revert') {
+            $this->extra['um'] = 2;
+        } else {
+            throw new \InvalidArgumentException('Passed invalid $mode!');
+        }
+
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getUndoMode(): string
+    {
+        $mode_int = $this->extra['um'] ?? 1;
+        if ($mode_int === 1) {
+            return 'undo';
+        } else {
+            return 'revert';
+        }
     }
 }

src/Entity/Parts/Part.php

@@ -85,7 +85,7 @@ class Part extends AttachmentContainingDBElement
     /**
      * TODO.
      */
-    protected $devices;
+    protected $devices = [];
 
     /**
      * @ColumnSecurity(type="datetime")

src/Entity/Parts/PartLot.php

@@ -44,6 +44,7 @@ namespace App\Entity\Parts;
 
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\Base\TimestampTrait;
+use App\Entity\Contracts\TimeStampableInterface;
 use App\Validator\Constraints\Selectable;
 use App\Validator\Constraints\ValidPartLot;
 use DateTime;
@@ -60,7 +61,7 @@ use Symfony\Component\Validator\Constraints as Assert;
  * @ORM\HasLifecycleCallbacks()
  * @ValidPartLot()
  */
-class PartLot extends AbstractDBElement
+class PartLot extends AbstractDBElement implements TimeStampableInterface
 {
     use TimestampTrait;
 

src/Entity/PriceInformations/Orderdetail.php

@@ -52,6 +52,7 @@ namespace App\Entity\PriceInformations;
 
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\Base\TimestampTrait;
+use App\Entity\Contracts\TimeStampableInterface;
 use App\Entity\Parts\Part;
 use App\Entity\Parts\Supplier;
 use Doctrine\Common\Collections\ArrayCollection;
@@ -66,7 +67,7 @@ use Symfony\Component\Validator\Constraints as Assert;
  * @ORM\Entity()
  * @ORM\HasLifecycleCallbacks()
  */
-class Orderdetail extends AbstractDBElement
+class Orderdetail extends AbstractDBElement implements TimeStampableInterface
 {
     use TimestampTrait;
 

src/Entity/PriceInformations/Pricedetail.php

@@ -52,6 +52,7 @@ namespace App\Entity\PriceInformations;
 
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\Base\TimestampTrait;
+use App\Entity\Contracts\TimeStampableInterface;
 use App\Validator\Constraints\Selectable;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
@@ -65,7 +66,7 @@ use Symfony\Component\Validator\Constraints as Assert;
  * @ORM\HasLifecycleCallbacks()
  * @UniqueEntity(fields={"orderdetail", "min_discount_quantity"})
  */
-class Pricedetail extends AbstractDBElement
+class Pricedetail extends AbstractDBElement implements TimeStampableInterface
 {
     use TimestampTrait;
 

src/Entity/UserSystem/PermissionsEmbed.php

@@ -481,7 +481,7 @@ class PermissionsEmbed
      */
     final protected static function readBitPair($data, int $n): int
     {
-        Assert::lessThanEq($n, 31, '$n must be smaller than 32, because only a 32bit int is used! Got %s.');
+        //Assert::lessThanEq($n, 31, '$n must be smaller than 32, because only a 32bit int is used! Got %s.');
         if (0 !== $n % 2) {
             throw new InvalidArgumentException('$n must be dividable by 2, because we address bit pairs here!');
         }
@@ -501,7 +501,7 @@ class PermissionsEmbed
      */
     final protected static function writeBitPair(int $data, int $n, int $new): int
     {
-        Assert::lessThanEq($n, 31, '$n must be smaller than 32, because only a 32bit int is used! Got %s.');
+        //Assert::lessThanEq($n, 31, '$n must be smaller than 32, because only a 32bit int is used! Got %s.');
         Assert::lessThanEq($new, 3, '$new must be smaller than 3, because a bit pair is written! Got %s.');
         Assert::greaterThanEq($new, 0, '$new must not be negative, because a bit pair is written! Got %s.');
 

src/EventSubscriber/EventLoggerSubscriber.php

@@ -20,25 +20,71 @@
 
 namespace App\EventSubscriber;
 
+use App\Entity\Attachments\Attachment;
+use App\Entity\Attachments\AttachmentType;
 use App\Entity\Base\AbstractDBElement;
+use App\Entity\Base\AbstractPartsContainingDBElement;
+use App\Entity\Base\AbstractStructuralDBElement;
 use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
 use App\Entity\LogSystem\ElementCreatedLogEntry;
 use App\Entity\LogSystem\ElementDeletedLogEntry;
 use App\Entity\LogSystem\ElementEditedLogEntry;
+use App\Entity\Parts\PartLot;
+use App\Entity\PriceInformations\Orderdetail;
+use App\Entity\PriceInformations\Pricedetail;
+use App\Entity\UserSystem\User;
+use App\Services\LogSystem\EventCommentHelper;
 use App\Services\LogSystem\EventLogger;
+use App\Services\LogSystem\EventUndoHelper;
 use Doctrine\Common\EventSubscriber;
+use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Event\OnFlushEventArgs;
 use Doctrine\ORM\Event\PostFlushEventArgs;
 use Doctrine\ORM\Events;
 use Doctrine\Persistence\Event\LifecycleEventArgs;
+use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
+use Symfony\Component\Serializer\SerializerInterface;
 
 class EventLoggerSubscriber implements EventSubscriber
 {
-    protected $logger;
+    /** @var array The given fields will not be saved, because they contain sensitive informations */
+    protected const FIELD_BLACKLIST = [
+        User::class => ['password', 'need_pw_change', 'googleAuthenticatorSecret', 'backupCodes', 'trustedDeviceCookieVersion', 'pw_reset_token', 'backupCodesGenerationDate'],
+    ];
 
-    public function __construct(EventLogger $logger)
+    /** @var array If elements of the given class are deleted, a log for the given fields will be triggered */
+    protected const TRIGGER_ASSOCIATION_LOG_WHITELIST = [
+        PartLot::class => ['part'],
+        Orderdetail::class => ['part'],
+        Pricedetail::class => ['orderdetail'],
+        Attachment::class => ['element'],
+    ];
+
+    protected const MAX_STRING_LENGTH = 2000;
+
+    protected $logger;
+    protected $serializer;
+    protected $eventCommentHelper;
+    protected $eventUndoHelper;
+    protected $save_changed_fields;
+    protected $save_changed_data;
+    protected $save_removed_data;
+    protected $propertyAccessor;
+
+    public function __construct(EventLogger $logger, SerializerInterface $serializer, EventCommentHelper $commentHelper,
+        bool $save_changed_fields, bool $save_changed_data, bool $save_removed_data, PropertyAccessorInterface $propertyAccessor,
+        EventUndoHelper $eventUndoHelper)
     {
         $this->logger = $logger;
+        $this->serializer = $serializer;
+        $this->eventCommentHelper = $commentHelper;
+        $this->propertyAccessor = $propertyAccessor;
+        $this->eventUndoHelper = $eventUndoHelper;
+
+        $this->save_changed_fields = $save_changed_fields;
+        $this->save_changed_data = $save_changed_data;
+        $this->save_removed_data = $save_removed_data;
     }
 
     public function onFlush(OnFlushEventArgs $eventArgs)
@@ -53,30 +99,43 @@ class EventLoggerSubscriber implements EventSubscriber
 
         foreach ($uow->getScheduledEntityUpdates() as $entity) {
             if ($this->validEntity($entity)) {
-                $log = new ElementEditedLogEntry($entity);
-                $this->logger->log($log);
+                $this->logElementEdited($entity, $em);
             }
         }
 
         foreach ($uow->getScheduledEntityDeletions() as $entity) {
             if ($this->validEntity($entity)) {
-                $log = new ElementDeletedLogEntry($entity);
-                $this->logger->log($log);
+                $this->logElementDeleted($entity, $em);
             }
         }
 
-
         $uow->computeChangeSets();
     }
 
     public function postPersist(LifecycleEventArgs $args)
     {
-        //Create an log entry
+        //Create an log entry, we have to do this post persist, cause we have to know the ID
 
         /** @var AbstractDBElement $entity */
         $entity = $args->getObject();
         if ($this->validEntity($entity)) {
             $log = new ElementCreatedLogEntry($entity);
+            //Add user comment to log entry
+            if ($this->eventCommentHelper->isMessageSet()) {
+                $log->setComment($this->eventCommentHelper->getMessage());
+            }
+            if ($this->eventUndoHelper->isUndo()) {
+                $undoEvent = $this->eventUndoHelper->getUndoneEvent();
+
+                $log->setUndoneEvent($undoEvent, $this->eventUndoHelper->getMode());
+
+                if($undoEvent instanceof ElementDeletedLogEntry && $undoEvent->getTargetClass() === $log->getTargetClass()) {
+                    $log->setTargetElementID($undoEvent->getTargetID());
+                }
+                if($undoEvent instanceof CollectionElementDeleted && $undoEvent->getDeletedElementClass() === $log->getTargetClass()) {
+                    $log->setTargetElementID($undoEvent->getDeletedElementID());
+                }
+            }
             $this->logger->log($log);
         }
     }
@@ -89,6 +148,158 @@ class EventLoggerSubscriber implements EventSubscriber
         if ($uow->hasPendingInsertions()) {
             $em->flush();
         }
+
+        //Clear the message provided by user.
+        $this->eventCommentHelper->clearMessage();
+        $this->eventUndoHelper->clearUndoneEvent();
+    }
+
+    protected function logElementDeleted(AbstractDBElement $entity, EntityManagerInterface $em): void
+    {
+        $log = new ElementDeletedLogEntry($entity);
+        //Add user comment to log entry
+        if ($this->eventCommentHelper->isMessageSet()) {
+            $log->setComment($this->eventCommentHelper->getMessage());
+        }
+        if ($this->eventUndoHelper->isUndo()) {
+            $log->setUndoneEvent($this->eventUndoHelper->getUndoneEvent(), $this->eventUndoHelper->getMode());
+        }
+        if ($this->save_removed_data) {
+            //The 4th param is important here, as we delete the element...
+            $this->saveChangeSet($entity, $log, $em, true);
+        }
+        $this->logger->log($log);
+
+        //Check if we have to log CollectionElementDeleted entries
+        if ($this->save_changed_data) {
+            $metadata = $em->getClassMetadata(get_class($entity));
+            $mappings = $metadata->getAssociationMappings();
+            //Check if class is whitelisted for CollectionElementDeleted entry
+            foreach (static::TRIGGER_ASSOCIATION_LOG_WHITELIST as $class => $whitelist) {
+                if (is_a($entity, $class)) {
+                    //Check names
+                    foreach ($mappings as $field => $mapping) {
+                        if (in_array($field, $whitelist)) {
+                            $changed = $this->propertyAccessor->getValue($entity, $field);
+                            $log = new CollectionElementDeleted($changed, $mapping['inversedBy'], $entity);
+                            if ($this->eventUndoHelper->isUndo()) {
+                                $log->setUndoneEvent($this->eventUndoHelper->getUndoneEvent(), $this->eventUndoHelper->getMode());
+                            }
+                            $this->logger->log($log);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    protected function logElementEdited(AbstractDBElement $entity, EntityManagerInterface $em): void
+    {
+        $uow = $em->getUnitOfWork();
+
+        $log = new ElementEditedLogEntry($entity);
+        if ($this->save_changed_data) {
+            $this->saveChangeSet($entity, $log, $em);
+        } elseif ($this->save_changed_fields) {
+            $changed_fields = array_keys($uow->getEntityChangeSet($entity));
+            //Remove lastModified field, as this is always changed (gives us no additional info)
+            $changed_fields = array_diff($changed_fields, ['lastModified']);
+            $log->setChangedFields($changed_fields);
+        }
+        //Add user comment to log entry
+        if ($this->eventCommentHelper->isMessageSet()) {
+            $log->setComment($this->eventCommentHelper->getMessage());
+        }
+        if ($this->eventUndoHelper->isUndo()) {
+            $log->setUndoneEvent($this->eventUndoHelper->getUndoneEvent(), $this->eventUndoHelper->getMode());
+        }
+        $this->logger->log($log);
+    }
+
+    /**
+     * Check if the given element class has restrictions to its fields
+     * @param  AbstractDBElement  $element
+     * @return bool True if there are restrictions, and further checking is needed
+     */
+    public function hasFieldRestrictions(AbstractDBElement $element): bool
+    {
+        foreach (static::FIELD_BLACKLIST as $class => $blacklist) {
+            if (is_a($element, $class)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Filter out every forbidden field and return the cleaned array.
+     * @param  AbstractDBElement  $element
+     * @param  array  $fields
+     * @return array
+     */
+    protected function filterFieldRestrictions(AbstractDBElement $element, array $fields): array
+    {
+        unset($fields['lastModified']);
+
+        if (!$this->hasFieldRestrictions($element)) {
+            return $fields;
+        }
+
+        return array_filter($fields, function ($value, $key) use ($element) {
+            //Associative array (save changed data) case
+            if (is_string($key)) {
+                return $this->shouldFieldBeSaved($element, $key);
+            }
+
+            return $this->shouldFieldBeSaved($element, $value);
+        }, ARRAY_FILTER_USE_BOTH);
+    }
+
+    /**
+     * Checks if the field of the given element should be saved (if it is not blacklisted).
+     * @param  AbstractDBElement  $element
+     * @param  string  $field_name
+     * @return bool
+     */
+    public function shouldFieldBeSaved(AbstractDBElement $element, string $field_name): bool
+    {
+        foreach (static::FIELD_BLACKLIST as $class => $blacklist) {
+            if (is_a($element, $class) && in_array($field_name, $blacklist)) {
+                return false;
+            }
+        }
+
+        //By default allow every field.
+        return true;
+    }
+
+    protected function saveChangeSet(AbstractDBElement $entity, AbstractLogEntry $logEntry, EntityManagerInterface $em, $element_deleted = false): void
+    {
+        $uow = $em->getUnitOfWork();
+
+        if (!$logEntry instanceof ElementEditedLogEntry && !$logEntry instanceof ElementDeletedLogEntry) {
+            throw new \InvalidArgumentException('$logEntry must be ElementEditedLogEntry or ElementDeletedLogEntry!');
+        }
+
+        if ($element_deleted) { //If the element was deleted we can use getOriginalData to save its content
+            $old_data = $uow->getOriginalEntityData($entity);
+        } else { //Otherwise we have to get it from entity changeset
+            $changeSet = $uow->getEntityChangeSet($entity);
+            $old_data = array_combine(array_keys($changeSet), array_column($changeSet, 0));
+        }
+        $old_data = $this->filterFieldRestrictions($entity, $old_data);
+
+        //Restrict length of string fields, to save memory...
+        $old_data = array_map(function ($value) {
+            if (is_string($value)) {
+                return mb_strimwidth($value, 0, self::MAX_STRING_LENGTH, '...');
+            }
+
+            return $value;
+        }, $old_data);
+
+        $logEntry->setOldData($old_data);
     }
 
     /**

src/Form/AdminPages/BaseEntityAdminForm.php

@@ -144,6 +144,13 @@ class BaseEntityAdminForm extends AbstractType
             'entity' => $entity,
         ]);
 
+        $builder->add('log_comment', TextType::class, [
+            'label' => 'edit.log_comment',
+            'mapped' => false,
+            'required' => false,
+            'empty_data' => null,
+        ]);
+
         //Buttons
         $builder->add('save', SubmitType::class, [
             'label' => $is_new ? 'entity.create' : 'entity.edit.save',

src/Form/Part/PartBaseType.php

@@ -264,6 +264,13 @@ class PartBaseType extends AbstractType
             ],
         ]);
 
+        $builder->add('log_comment', TextType::class, [
+            'label' => 'edit.log_comment',
+            'mapped' => false,
+            'required' => false,
+            'empty_data' => null,
+        ]);
+
         $builder
             //Buttons
             ->add('save', SubmitType::class, ['label' => 'part.edit.save'])

src/Form/UserAdminForm.php

@@ -250,6 +250,13 @@ class UserAdminForm extends AbstractType
             'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
         ]);
 
+        $builder->add('log_comment', TextType::class, [
+            'label' => 'edit.log_comment',
+            'mapped' => false,
+            'required' => false,
+            'empty_data' => null,
+        ]);
+
         //Buttons
         $builder->add('save', SubmitType::class, [
             'label' => $is_new ? 'user.create' : 'user.edit.save',

src/Repository/AttachmentRepository.php

@@ -23,7 +23,7 @@ namespace App\Repository;
 
 use Doctrine\ORM\EntityRepository;
 
-class AttachmentRepository extends EntityRepository
+class AttachmentRepository extends DBElementRepository
 {
     /**
      * Gets the count of all private/secure attachments.

src/Repository/DBElementRepository.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Repository;
+
+
+use App\Entity\Base\AbstractDBElement;
+use Doctrine\ORM\EntityRepository;
+
+class DBElementRepository extends EntityRepository
+{
+    /**
+     * Changes the ID of the given element to a new value.
+     * You should only use it to undelete former existing elements, everything else is most likely a bad idea!
+     * @param  AbstractDBElement  $element The element whose ID should be changed
+     * @param  int  $new_id The new ID
+     */
+    public function changeID(AbstractDBElement $element, int $new_id): void
+    {
+        $qb = $this->createQueryBuilder('element');
+        $q = $qb->update(get_class($element), 'element')
+            ->set('element.id', $new_id)
+            ->where('element.id = ?1')
+            ->setParameter(1, $element->getID())
+            ->getQuery();
+
+        $p = $q->execute();
+
+        $this->setField($element, 'id', $new_id);
+    }
+
+    protected function setField(AbstractDBElement $element, string $field, $new_value)
+    {
+        $reflection = new \ReflectionClass(get_class($element));
+        $property = $reflection->getProperty($field);
+        $property->setAccessible(true);
+        $property->setValue($element, $new_value);
+    }
+}

src/Repository/LogEntryRepository.php

@@ -44,13 +44,15 @@ namespace App\Repository;
 
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
 use App\Entity\LogSystem\ElementCreatedLogEntry;
+use App\Entity\LogSystem\ElementDeletedLogEntry;
 use App\Entity\LogSystem\ElementEditedLogEntry;
 use App\Entity\UserSystem\User;
 use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\QueryBuilder;
 
-class LogEntryRepository extends EntityRepository
+class LogEntryRepository extends DBElementRepository
 {
     public function findBy(array $criteria, ?array $orderBy = null, $limit = null, $offset = null)
     {
@@ -81,6 +83,93 @@ class LogEntryRepository extends EntityRepository
         return $this->findBy(['element' => $element], ['timestamp' => $order], $limit, $offset);
     }
 
+    /**
+     * Try to get a log entry that contains the information to undete a given element
+     * @param  string  $class The class of the element that should be undeleted
+     * @param  int  $id The ID of the element that should be deleted
+     * @return ElementDeletedLogEntry
+     */
+    public function getUndeleteDataForElement(string $class, int $id): ElementDeletedLogEntry
+    {
+        $qb = $this->createQueryBuilder('log');
+        $qb->select('log')
+            //->where('log INSTANCE OF App\Entity\LogSystem\ElementEditedLogEntry')
+            ->where('log INSTANCE OF ' . ElementDeletedLogEntry::class)
+            ->andWhere('log.target_type = :target_type')
+            ->andWhere('log.target_id = :target_id')
+            ->orderBy('log.timestamp', 'DESC')
+            ->setMaxResults(1);
+
+        $qb->setParameters([
+                               'target_type' => AbstractLogEntry::targetTypeClassToID($class),
+                               'target_id' => $id,
+                           ]);
+
+        $query =  $qb->getQuery();
+
+        $results = $query->execute();
+
+        if (empty($results)) {
+            throw new \RuntimeException("No undelete data could be found for this element");
+        }
+        return $results[0];
+    }
+
+    /**
+     * Gets all log entries that are related to time travelling
+     * @param  AbstractDBElement  $element The element for which the time travel data should be retrieved
+     * @param  \DateTime  $until Back to which timestamp should the data be get (including the timestamp)
+     * @return AbstractLogEntry[]
+     */
+    public function getTimetravelDataForElement(AbstractDBElement $element, \DateTime $until): array
+    {
+        $qb = $this->createQueryBuilder('log');
+        $qb->select('log')
+            //->where('log INSTANCE OF App\Entity\LogSystem\ElementEditedLogEntry')
+            ->where('log INSTANCE OF ' . ElementEditedLogEntry::class)
+            ->orWhere('log INSTANCE OF ' . CollectionElementDeleted::class)
+            ->andWhere('log.target_type = :target_type')
+            ->andWhere('log.target_id = :target_id')
+            ->andWhere('log.timestamp >= :until')
+            ->orderBy('log.timestamp', 'DESC');
+
+        $qb->setParameters([
+                               'target_type' => AbstractLogEntry::targetTypeClassToID(get_class($element)),
+                               'target_id' => $element->getID(),
+                               'until' => $until
+                           ]);
+
+        $query = $qb->getQuery();
+        return $query->execute();
+    }
+
+    /**
+     * Check if the given element has existed at the given timestamp
+     * @param  AbstractDBElement  $element
+     * @param  \DateTime  $timestamp
+     * @return bool True if the element existed at the given timestamp
+     */
+    public function getElementExistedAtTimestamp(AbstractDBElement $element, \DateTime $timestamp): bool
+    {
+        $qb = $this->createQueryBuilder('log');
+        $qb->select('count(log)')
+            ->where('log INSTANCE OF ' . ElementCreatedLogEntry::class)
+            ->andWhere('log.target_type = :target_type')
+            ->andWhere('log.target_id = :target_id')
+            ->andWhere('log.timestamp >= :until')
+            ->orderBy('log.timestamp', 'DESC');
+
+        $qb->setParameters([
+                               'target_type' => AbstractLogEntry::targetTypeClassToID(get_class($element)),
+                               'target_id' => $element->getID(),
+                               'until' => $timestamp
+                           ]);
+
+        $query = $qb->getQuery();
+        $count = $query->getSingleScalarResult();
+        return !($count > 0);
+    }
+
     /**
      * Gets the last log entries ordered by timestamp.
      *

src/Repository/NamedDBElementRepository.php

@@ -46,7 +46,7 @@ use App\Entity\Base\AbstractNamedDBElement;
 use App\Helpers\Trees\TreeViewNode;
 use Doctrine\ORM\EntityRepository;
 
-class NamedDBElementRepository extends EntityRepository
+class NamedDBElementRepository extends DBElementRepository
 {
     /**
      * Gets a tree of TreeViewNode elements. The root elements has $parent as parent.

src/Repository/PartRepository.php

@@ -46,7 +46,7 @@ use App\Entity\Parts\PartLot;
 use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\QueryBuilder;
 
-class PartRepository extends EntityRepository
+class PartRepository extends NamedDBElementRepository
 {
     /**
      * Gets the summed up instock of all parts (only parts without an measurent unit)

src/Security/Voter/AttachmentVoter.php

@@ -58,11 +58,7 @@ class AttachmentVoter extends ExtendedVoter
      */
     protected function voteOnUser($attribute, $subject, User $user): bool
     {
-        if ($subject instanceof Attachment) {
-            return $this->resolver->inherit($user, 'parts_attachments', $attribute) ?? false;
-        }
-
-        return false;
+        return $this->resolver->inherit($user, 'parts_attachments', $attribute) ?? false;
     }
 
     /**
@@ -75,10 +71,11 @@ class AttachmentVoter extends ExtendedVoter
      */
     protected function supports($attribute, $subject)
     {
-        if ($subject instanceof Attachment) {
+        if (is_a($subject, Attachment::class, true)) {
             return in_array($attribute, $this->resolver->listOperationsForPermission('parts_attachments'), false);
         }
 
+        //Allow class name as subject
         return false;
     }
 }

src/Security/Voter/GroupVoter.php

@@ -57,11 +57,7 @@ class GroupVoter extends ExtendedVoter
      */
     protected function voteOnUser($attribute, $subject, User $user): bool
     {
-        if ($subject instanceof Group) {
-            return $this->resolver->inherit($user, 'groups', $attribute) ?? false;
-        }
-
-        return false;
+        return $this->resolver->inherit($user, 'groups', $attribute) ?? false;
     }
 
     /**
@@ -74,7 +70,7 @@ class GroupVoter extends ExtendedVoter
      */
     protected function supports($attribute, $subject)
     {
-        if ($subject instanceof Group) {
+        if (is_a($subject, Group::class, true)) {
             return $this->resolver->isValidOperation('groups', $attribute);
         }
 

src/Security/Voter/LogEntryVoter.php

@@ -51,22 +51,20 @@ class LogEntryVoter extends ExtendedVoter
 
     protected function voteOnUser($attribute, $subject, User $user): bool
     {
-        if ($subject instanceof AbstractLogEntry) {
-            if ('delete' === $attribute) {
-                return $this->resolver->inherit($user, 'system', 'delete_logs') ?? false;
+        if ('delete' === $attribute) {
+            return $this->resolver->inherit($user, 'system', 'delete_logs') ?? false;
+        }
+
+        if ('read' === $attribute) {
+            //Allow read of the users own log entries
+            if (
+                $subject->getUser() === $user
+                && $this->resolver->inherit($user, 'self', 'show_logs')
+            ) {
+                return true;
             }
 
-            if ('read' === $attribute) {
-                //Allow read of the users own log entries
-                if (
-                    $subject->getUser() === $user
-                    && $this->resolver->inherit($user, 'self', 'show_logs')
-                ) {
-                    return true;
-                }
-
-                return $this->resolver->inherit($user, 'system', 'show_logs') ?? false;
-            }
+            return $this->resolver->inherit($user, 'system', 'show_logs') ?? false;
         }
 
         return false;

src/Security/Voter/OrderdetailVoter.php

@@ -0,0 +1,59 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Security\Voter;
+
+
+use App\Entity\Parts\PartLot;
+use App\Entity\PriceInformations\Orderdetail;
+use App\Entity\UserSystem\User;
+
+class OrderdetailVoter extends ExtendedVoter
+{
+    /** @var string[] When this permsission are encountered, they are checked on part */
+    protected const PART_PERMS = ['show_history', 'revert_element'];
+
+    /**
+     * @inheritDoc
+     */
+    protected function voteOnUser($attribute, $subject, User $user): bool
+    {
+        if (in_array($attribute, self::PART_PERMS, true)) {
+            return $this->resolver->inherit($user, 'parts', $attribute) ?? false;
+        }
+
+        return $this->resolver->inherit($user, 'parts_orderdetails', $attribute) ?? false;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    protected function supports($attribute, $subject)
+    {
+        if (is_a($subject, Orderdetail::class, true)) {
+            return in_array($attribute, array_merge(
+                self::PART_PERMS,
+                $this->resolver->listOperationsForPermission('parts_orderdetails')
+            ), true);
+        }
+
+        return false;
+    }
+}

src/Security/Voter/PartLotVoter.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Security\Voter;
+
+
+use App\Entity\Parts\PartLot;
+use App\Entity\UserSystem\User;
+
+class PartLotVoter extends ExtendedVoter
+{
+    /** @var string[] When this permsission are encountered, they are checked on part */
+    protected const PART_PERMS = ['show_history', 'revert_element'];
+
+    /**
+     * @inheritDoc
+     */
+    protected function voteOnUser($attribute, $subject, User $user): bool
+    {
+        if (in_array($attribute, self::PART_PERMS, true)) {
+            return $this->resolver->inherit($user, 'parts', $attribute) ?? false;
+        }
+
+        return $this->resolver->inherit($user, 'parts_lots', $attribute) ?? false;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    protected function supports($attribute, $subject)
+    {
+        if (is_a($subject, PartLot::class, true)) {
+            return in_array($attribute, array_merge(
+                self::PART_PERMS,
+                $this->resolver->listOperationsForPermission('parts_lots')
+            ), true);
+        }
+
+        return false;
+    }
+}

src/Security/Voter/PartVoter.php

@@ -57,11 +57,7 @@ class PartVoter extends ExtendedVoter
 
     protected function supports($attribute, $subject)
     {
-        // replace with your own logic
-        // https://symfony.com/doc/current/security/voters.html
-        //return ($subject instanceof Part || in_array($subject, ['PERM_parts', 'PERM_parts_name']));
-
-        if ($subject instanceof Part) {
+        if (is_a($subject, Part::class, true)) {
             //Check if a sub permission should be checked -> $attribute has format name.edit
             if (false !== strpos($attribute, '.')) {
                 [$perm, $op] = explode('.', $attribute);
@@ -72,24 +68,21 @@ class PartVoter extends ExtendedVoter
             return $this->resolver->isValidOperation('parts', $attribute);
         }
 
+        //Allow class name as subject
         return false;
     }
 
     protected function voteOnUser($attribute, $subject, User $user): bool
     {
-        if ($subject instanceof Part) {
-            //Check for sub permissions
-            if (false !== strpos($attribute, '.')) {
-                [$perm, $op] = explode('.', $attribute);
+        //Check for sub permissions
+        if (false !== strpos($attribute, '.')) {
+            [$perm, $op] = explode('.', $attribute);
 
-                return $this->resolver->inherit($user, 'parts_'.$perm, $op) ?? false;
-            }
-
-            //Null concealing operator means, that no
-            return $this->resolver->inherit($user, 'parts', $attribute) ?? false;
+            return $this->resolver->inherit($user, 'parts_'.$perm, $op) ?? false;
         }
 
-        //Deny access by default.
-        return false;
+        //Null concealing operator means, that no
+        return $this->resolver->inherit($user, 'parts', $attribute) ?? false;
+
     }
 }

src/Security/Voter/PricedetailVoter.php

@@ -0,0 +1,59 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Security\Voter;
+
+
+use App\Entity\Parts\PartLot;
+use App\Entity\PriceInformations\Pricedetail;
+use App\Entity\UserSystem\User;
+
+class PricedetailVoter extends ExtendedVoter
+{
+    /** @var string[] When this permsission are encountered, they are checked on part */
+    protected const PART_PERMS = ['show_history', 'revert_element'];
+
+    /**
+     * @inheritDoc
+     */
+    protected function voteOnUser($attribute, $subject, User $user): bool
+    {
+        if (in_array($attribute, self::PART_PERMS, true)) {
+            return $this->resolver->inherit($user, 'parts', $attribute) ?? false;
+        }
+
+        return $this->resolver->inherit($user, 'parts_prices', $attribute) ?? false;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    protected function supports($attribute, $subject)
+    {
+        if (is_a($subject, Pricedetail::class, true)) {
+            return in_array($attribute, array_merge(
+                self::PART_PERMS,
+                $this->resolver->listOperationsForPermission('parts_prices')
+            ), true);
+        }
+
+        return false;
+    }
+}

src/Security/Voter/StructureVoter.php

@@ -43,11 +43,13 @@ declare(strict_types=1);
 namespace App\Security\Voter;
 
 use App\Entity\Attachments\AttachmentType;
+use App\Entity\Base\AbstractStructuralDBElement;
 use App\Entity\Devices\Device;
 use App\Entity\Parts\Category;
 use App\Entity\Parts\Footprint;
 use App\Entity\Parts\Manufacturer;
 use App\Entity\Parts\MeasurementUnit;
+use App\Entity\Parts\Part;
 use App\Entity\Parts\Storelocation;
 use App\Entity\Parts\Supplier;
 use App\Entity\PriceInformations\Currency;
@@ -67,24 +69,29 @@ class StructureVoter extends ExtendedVoter
      */
     protected function supports($attribute, $subject)
     {
-        if (is_object($subject)) {
+        if (is_object($subject) || is_string($subject)) {
             $permission_name = $this->instanceToPermissionName($subject);
             //If permission name is null, then the subject is not supported
             return (null !== $permission_name) && $this->resolver->isValidOperation($permission_name, $attribute);
         }
+
         return false;
     }
 
     /**
      * Maps a instance type to the permission name.
      *
-     * @param mixed $subject The subject for which the permission name should be generated
+     * @param object|string $subject The subject for which the permission name should be generated
      *
      * @return string|null the name of the permission for the subject's type or null, if the subject is not supported
      */
     protected function instanceToPermissionName($subject): ?string
     {
-        $class_name = get_class($subject);
+        if (!is_string($subject)) {
+            $class_name = get_class($subject);
+        } else {
+            $class_name = $subject;
+        }
         switch ($class_name) {
             case AttachmentType::class:
                 return 'attachment_types';

src/Security/Voter/UserVoter.php

@@ -57,11 +57,11 @@ class UserVoter extends ExtendedVoter
      */
     protected function supports($attribute, $subject)
     {
-        if ($subject instanceof User) {
+        if (is_a($subject, User::class, true)) {
             return in_array($attribute, array_merge(
                 $this->resolver->listOperationsForPermission('users'),
                 $this->resolver->listOperationsForPermission('self')),
-            false
+                            false
             );
         }
 
@@ -89,10 +89,11 @@ class UserVoter extends ExtendedVoter
                     return $tmp;
                 }
             }
-            //Else just check users permission:
-            if ($this->resolver->isValidOperation('users', $attribute)) {
-                return $this->resolver->inherit($user, 'users', $attribute) ?? false;
-            }
+        }
+
+        //Else just check users permission:
+        if ($this->resolver->isValidOperation('users', $attribute)) {
+            return $this->resolver->inherit($user, 'users', $attribute) ?? false;
         }
 
         return false;

src/Services/EntityExporter.php

@@ -43,6 +43,14 @@ declare(strict_types=1);
 namespace App\Services;
 
 use App\Entity\Base\AbstractNamedDBElement;
+use Symfony\Component\Serializer\Encoder\CsvEncoder;
+use Symfony\Component\Serializer\Encoder\JsonEncoder;
+use Symfony\Component\Serializer\Encoder\XmlEncoder;
+use Symfony\Component\Serializer\Encoder\YamlEncoder;
+use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
+use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Symfony\Component\Serializer\Serializer;
 use function in_array;
 use InvalidArgumentException;
 use function is_array;
@@ -62,6 +70,10 @@ class EntityExporter
 
     public function __construct(SerializerInterface $serializer)
     {
+        /*$encoders = [new XmlEncoder(), new JsonEncoder(), new CSVEncoder(), new YamlEncoder()];
+        $normalizers = [new ObjectNormalizer(), new DateTimeNormalizer()];
+        $this->serializer = new Serializer($normalizers, $encoders);
+        $this->serializer-> */
         $this->serializer = $serializer;
     }
 
@@ -120,13 +132,15 @@ class EntityExporter
             $entity_array = [$entity];
         }
 
-        $response = new Response($this->serializer->serialize($entity_array, $format,
-            [
-                'groups' => $groups,
-                'as_collection' => true,
-                'csv_delimiter' => ';', //Better for Excel
-                'xml_root_node_name' => 'PartDBExport',
-            ]));
+        $serialized_data = $this->serializer->serialize($entity_array, $format,
+                                                        [
+                                                            'groups' => $groups,
+                                                            'as_collection' => true,
+                                                            'csv_delimiter' => ';', //Better for Excel
+                                                            'xml_root_node_name' => 'PartDBExport',
+                                                        ]);
+
+        $response = new Response($serialized_data);
 
         $response->headers->set('Content-Type', $content_type);
 
@@ -151,7 +165,8 @@ class EntityExporter
             // Create the disposition of the file
             $disposition = $response->headers->makeDisposition(
                 ResponseHeaderBag::DISPOSITION_ATTACHMENT,
-                $filename
+                $filename,
+                $string = preg_replace('![^'.preg_quote('-').'a-z0-_9\s]+!', '', strtolower($filename))
             );
             // Set the content disposition
             $response->headers->set('Content-Disposition', $disposition);

src/Services/EntityURLGenerator.php

@@ -44,6 +44,7 @@ namespace App\Services;
 
 use App\Entity\Attachments\Attachment;
 use App\Entity\Attachments\AttachmentType;
+use App\Entity\Attachments\PartAttachment;
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\Devices\Device;
 use App\Entity\Parts\Category;
@@ -51,9 +52,12 @@ use App\Entity\Parts\Footprint;
 use App\Entity\Parts\Manufacturer;
 use App\Entity\Parts\MeasurementUnit;
 use App\Entity\Parts\Part;
+use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
 use App\Entity\Parts\Supplier;
 use App\Entity\PriceInformations\Currency;
+use App\Entity\PriceInformations\Orderdetail;
+use App\Entity\PriceInformations\Pricedetail;
 use App\Entity\UserSystem\Group;
 use App\Entity\UserSystem\User;
 use App\Exceptions\EntityNotSupportedException;
@@ -120,6 +124,70 @@ class EntityURLGenerator
         throw new InvalidArgumentException('Method is not supported!');
     }
 
+    /**
+     * Gets the URL to view the given element at a given timestamp
+     * @param AbstractDBElement $entity
+     * @param  \DateTime  $dateTime
+     * @return string
+     */
+    public function timeTravelURL(AbstractDBElement $entity, \DateTime $dateTime): string
+    {
+        $map = [
+            Part::class => 'part_info',
+
+            //As long we does not have own things for it use edit page
+            AttachmentType::class => 'attachment_type_edit',
+            Category::class => 'category_edit',
+            Device::class => 'device_edit',
+            Supplier::class => 'supplier_edit',
+            Manufacturer::class => 'manufacturer_edit',
+            Storelocation::class => 'store_location_edit',
+            Footprint::class => 'footprint_edit',
+            User::class => 'user_edit',
+            Currency::class => 'currency_edit',
+            MeasurementUnit::class => 'measurement_unit_edit',
+            Group::class => 'group_edit',
+        ];
+
+        try {
+            return $this->urlGenerator->generate(
+                $this->mapToController($map, $entity),
+                [
+                    'id' => $entity->getID(),
+                    'timestamp' => $dateTime->getTimestamp()
+                ]
+            );
+        } catch (EntityNotSupportedException $exception) {
+            if ($entity instanceof PartLot) {
+                return $this->urlGenerator->generate('part_info', [
+                    'id' => $entity->getPart()->getID(),
+                    'timestamp' => $dateTime->getTimestamp()
+                ]);
+            }
+            if ($entity instanceof PartAttachment) {
+                return $this->urlGenerator->generate('part_info', [
+                    'id' => $entity->getElement()->getID(),
+                    'timestamp' => $dateTime->getTimestamp()
+                ]);
+            }
+            if ($entity instanceof Orderdetail) {
+                return $this->urlGenerator->generate('part_info', [
+                    'id' => $entity->getPart()->getID(),
+                    'timestamp' => $dateTime->getTimestamp()
+                ]);
+            }
+            if ($entity instanceof Pricedetail) {
+                return $this->urlGenerator->generate('part_info', [
+                    'id' => $entity->getOrderdetail()->getPart()->getID(),
+                    'timestamp' => $dateTime->getTimestamp()
+                ]);
+            }
+        }
+
+        //Otherwise throw an error
+        throw new EntityNotSupportedException('The given entity is not supported yet!');
+    }
+
     public function viewURL($entity): string
     {
         if ($entity instanceof Attachment) {

src/Services/LogSystem/EventCommentHelper.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LogSystem;
+
+
+class EventCommentHelper
+{
+    protected const MAX_MESSAGE_LENGTH = 255;
+
+    protected $message;
+
+    public function __construct()
+    {
+        $message = null;
+    }
+
+    /**
+     * Set the message that will be saved for all ElementEdited/Created/Deleted messages during the next flush.
+     * Set to null if no message should be shown.
+     * After the flush this message is cleared.
+     * @param  string|null  $message
+     */
+    public function setMessage(?string $message): void
+    {
+        //Restrict the length of the string
+        $this->message = mb_strimwidth($message, 0, self::MAX_MESSAGE_LENGTH, '...');
+    }
+
+    /**
+     * Returns the currently set message, or null if no message is set yet.
+     * @return string|null
+     */
+    public function getMessage(): ?string
+    {
+        return $this->message;
+    }
+
+    /**
+     * Clear the currently set message.
+     */
+    public function clearMessage(): void
+    {
+        $this->message = null;
+    }
+
+    /**
+     * Check if a message is currently set.
+     * @return bool
+     */
+    public function isMessageSet(): bool
+    {
+        return is_string($this->message);
+    }
+}

src/Services/LogSystem/EventUndoHelper.php

@@ -0,0 +1,90 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LogSystem;
+
+
+use App\Entity\LogSystem\AbstractLogEntry;
+
+class EventUndoHelper
+{
+    public const MODE_UNDO = 'undo';
+    public const MODE_REVERT = 'revert';
+
+    protected const ALLOWED_MODES = [self::MODE_REVERT, self::MODE_UNDO];
+
+    protected $undone_event;
+    protected $mode;
+
+    public function __construct()
+    {
+        $undone_event = null;
+        $this->mode = self::MODE_UNDO;
+    }
+
+    public function setMode(string $mode): void
+    {
+        if (!in_array($mode, self::ALLOWED_MODES)) {
+            throw new \InvalidArgumentException('Invalid mode passed!');
+        }
+        $this->mode = $mode;
+    }
+
+    public function getMode(): string
+    {
+        return $this->mode;
+    }
+
+    /**
+     * Set which event log is currently undone.
+     * After the flush this message is cleared.
+     * @param  AbstractLogEntry|null  $undone_event
+     */
+    public function setUndoneEvent(?AbstractLogEntry $undone_event): void
+    {
+        $this->undone_event = $undone_event;
+    }
+
+    /**
+     * Returns event that is currently undone.
+     * @return AbstractLogEntry|null
+     */
+    public function getUndoneEvent(): ?AbstractLogEntry
+    {
+        return $this->undone_event;
+    }
+
+    /**
+     * Clear the currently the set undone event.
+     */
+    public function clearUndoneEvent(): void
+    {
+        $this->undone_event = null;
+    }
+
+    /**
+     * Check if a event is undone
+     * @return bool
+     */
+    public function isUndo(): bool
+    {
+        return ($this->undone_event instanceof AbstractLogEntry);
+    }
+}

src/Services/LogSystem/HistoryHelper.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LogSystem;
+
+
+use App\Entity\Attachments\AttachmentContainingDBElement;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Parts\Part;
+
+class HistoryHelper
+{
+    public function __construct()
+    {
+
+    }
+
+    /**
+     * Returns an array containing all elements that are associated with the argument.
+     * The returned array contains the given element.
+     * @param  AbstractDBElement  $element
+     * @return array
+     */
+    public function getAssociatedElements(AbstractDBElement $element): array
+    {
+        $array = [$element];
+        if ($element instanceof AttachmentContainingDBElement) {
+            $array = array_merge($array, $element->getAttachments()->toArray());
+        }
+
+        if ($element instanceof Part) {
+            $array = array_merge(
+                $array,
+                $element->getPartLots()->toArray(),
+                $element->getOrderdetails()->toArray()
+            );
+            foreach ($element->getOrderdetails() as $orderdetail) {
+                $array = array_merge($array, $orderdetail->getPricedetails()->toArray());
+            }
+        }
+
+        return $array;
+    }
+}

src/Services/LogSystem/LogEntryExtraFormatter.php

@@ -42,7 +42,10 @@ declare(strict_types=1);
 
 namespace App\Services\LogSystem;
 
+use App\Entity\Contracts\LogWithCommentInterface;
+use App\Entity\Contracts\LogWithEventUndoInterface;
 use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
 use App\Entity\LogSystem\DatabaseUpdatedLogEntry;
 use App\Entity\LogSystem\ElementCreatedLogEntry;
 use App\Entity\LogSystem\ElementDeletedLogEntry;
@@ -52,6 +55,8 @@ use App\Entity\LogSystem\InstockChangedLogEntry;
 use App\Entity\LogSystem\UserLoginLogEntry;
 use App\Entity\LogSystem\UserLogoutLogEntry;
 use App\Entity\LogSystem\UserNotAllowedLogEntry;
+use App\Services\ElementTypeNameGenerator;
+use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -60,10 +65,15 @@ use Symfony\Contracts\Translation\TranslatorInterface;
 class LogEntryExtraFormatter
 {
     protected $translator;
+    protected $elementTypeNameGenerator;
 
-    public function __construct(TranslatorInterface $translator)
+    protected const CONSOLE_SEARCH = ['<i class="fas fa-long-arrow-alt-right"></i>', '<i>', '</i>', '<b>', '</b>', ];
+    protected const CONSOLE_REPLACE = ['→', '<info>', '</info>', '<error>', '</error>'];
+
+    public function __construct(TranslatorInterface $translator, ElementTypeNameGenerator $elementTypeNameGenerator)
     {
         $this->translator = $translator;
+        $this->elementTypeNameGenerator = $elementTypeNameGenerator;
     }
 
     /**
@@ -73,32 +83,33 @@ class LogEntryExtraFormatter
      */
     public function formatConsole(AbstractLogEntry $logEntry): string
     {
-        $tmp = $this->format($logEntry);
+        $arr = $this->getInternalFormat($logEntry);
+        $tmp = [];
 
-        //Just a simple tweak to make the console output more pretty.
-        $search = ['<i>', '</i>', '<b>', '</b>', ' <i class="fas fa-long-arrow-alt-right">'];
-        $replace = ['<info>', '</info>', '<error>', '</error>', '→'];
+        //Make an array with entries in the form "<b>Key:</b> Value"
+        foreach ($arr as $key => $value) {
+            $str = '';
+            if (is_string($key)) {
+                $str .= '<error>' . $this->translator->trans($key) . '</error>: ';
+            }
+            $str .= $value;
+            if (!empty($str)) {
+                $tmp[] = $str;
+            }
+        }
 
-        return str_replace($search, $replace, $tmp);
+        return str_replace(static::CONSOLE_SEARCH, static::CONSOLE_REPLACE, implode("; ", $tmp));
     }
 
-    /**
-     * Return a HTML formatted string containing a user viewable form of the Extra data.
-     *
-     * @return string
-     */
-    public function format(AbstractLogEntry $context): string
+    protected function getInternalFormat(AbstractLogEntry $context): array
     {
+        $array = [];
         if ($context instanceof UserLoginLogEntry || $context instanceof UserLogoutLogEntry) {
-            return sprintf(
-                '<i>%s</i>: %s',
-                $this->translator->trans('log.user_login.ip'),
-                htmlspecialchars($context->getIPAddress())
-            );
+            $array['log.user_login.ip'] = htmlspecialchars($context->getIPAddress());
         }
 
         if ($context instanceof ExceptionLogEntry) {
-            return sprintf(
+            $array[] = sprintf(
                 '<i>%s</i> %s:%d : %s',
                 htmlspecialchars($context->getExceptionClass()),
                 htmlspecialchars($context->getFile()),
@@ -108,7 +119,7 @@ class LogEntryExtraFormatter
         }
 
         if ($context instanceof DatabaseUpdatedLogEntry) {
-            return sprintf(
+            $array[] = sprintf(
                 '<i>%s</i> %s <i class="fas fa-long-arrow-alt-right"></i> %s',
                 $this->translator->trans($context->isSuccessful() ? 'log.database_updated.success' : 'log.database_updated.failure'),
                 $context->getOldVersion(),
@@ -116,42 +127,85 @@ class LogEntryExtraFormatter
             );
         }
 
+        if ($context instanceof LogWithEventUndoInterface) {
+            if ($context->isUndoEvent()) {
+                if ($context->getUndoMode() === 'undo') {
+                    $array['log.undo_mode.undo'] = (string) $context->getUndoEventID();
+                } elseif ($context->getUndoMode() === 'revert') {
+                    $array['log.undo_mode.revert'] = (string) $context->getUndoEventID();
+                }
+            }
+        }
+
+        if ($context instanceof LogWithCommentInterface && $context->hasComment()) {
+            $array[] = htmlspecialchars($context->getComment());
+        }
+
         if ($context instanceof ElementCreatedLogEntry && $context->hasCreationInstockValue()) {
-            return sprintf(
-                '<i>%s</i>: %s',
-                $this->translator->trans('log.element_created.original_instock'),
-                $context->getCreationInstockValue()
-            );
+            $array['log.element_created.original_instock'] = (string) $context->getCreationInstockValue();
         }
 
         if ($context instanceof ElementDeletedLogEntry) {
-            return sprintf(
-                '<i>%s</i>: %s',
-                $this->translator->trans('log.element_deleted.old_name'),
-                $context->getOldName() ?? $this->translator->trans('log.element_deleted.old_name.unknown')
-            );
+            if ($context->getOldName() !== null) {
+                $array['log.element_deleted.old_name'] = htmlspecialchars($context->getOldName());
+            } else {
+                $array['log.element_deleted.old_name'] = $this->translator->trans('log.element_deleted.old_name.unknown');
+            }
         }
 
-        if ($context instanceof ElementEditedLogEntry && ! empty($context->getMessage())) {
-            return htmlspecialchars($context->getMessage());
+        if ($context instanceof ElementEditedLogEntry && $context->hasChangedFieldsInfo()) {
+            $array['log.element_edited.changed_fields'] = htmlspecialchars(implode(', ', $context->getChangedFields()));
         }
 
         if ($context instanceof InstockChangedLogEntry) {
-            return sprintf(
-                '<i>%s</i>; %s <i class="fas fa-long-arrow-alt-right"></i> %s (%s); %s: %s',
-                $this->translator->trans($context->isWithdrawal() ? 'log.instock_changed.withdrawal' : 'log.instock_changed.added'),
+            $array[] = $this->translator->trans($context->isWithdrawal() ? 'log.instock_changed.withdrawal' : 'log.instock_changed.added');
+            $array[] = sprintf(
+                '%s <i class="fas fa-long-arrow-alt-right"></i> %s (%s)',
                 $context->getOldInstock(),
                 $context->getNewInstock(),
-                (! $context->isWithdrawal() ? '+' : '-').$context->getDifference(true),
-                $this->translator->trans('log.instock_changed.comment'),
-                htmlspecialchars($context->getComment())
+                (! $context->isWithdrawal() ? '+' : '-').$context->getDifference(true)
+            );
+            $array['log.instock_changed.comment'] = htmlspecialchars($context->getComment());
+        }
+
+        if ($context instanceof CollectionElementDeleted) {
+            $array['log.collection_deleted.deleted'] = sprintf(
+                '%s: %s (%s)',
+                $this->elementTypeNameGenerator->getLocalizedTypeLabel($context->getDeletedElementClass()),
+                $context->getOldName() ?? $context->getDeletedElementID(),
+                $context->getCollectionName()
             );
         }
 
         if ($context instanceof UserNotAllowedLogEntry) {
-            return htmlspecialchars($context->getMessage());
+            $array[] = htmlspecialchars($context->getMessage());
         }
 
-        return '';
+        return $array;
+    }
+
+    /**
+     * Return a HTML formatted string containing a user viewable form of the Extra data.
+     *
+     * @return string
+     */
+    public function format(AbstractLogEntry $context): string
+    {
+        $arr = $this->getInternalFormat($context);
+        $tmp = [];
+
+        //Make an array with entries in the form "<b>Key:</b> Value"
+        foreach ($arr as $key => $value) {
+            $str = '';
+            if (is_string($key)) {
+                $str .= '<b>' . $this->translator->trans($key) . '</b>: ';
+            }
+            $str .= $value;
+            if (!empty($str)) {
+                $tmp[] = $str;
+            }
+        }
+
+        return implode("; ", $tmp);
     }
 }

src/Services/LogSystem/TimeTravel.php

@@ -0,0 +1,217 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+namespace App\Services\LogSystem;
+
+
+use App\Entity\Attachments\AttachmentType;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Base\AbstractStructuralDBElement;
+use App\Entity\Contracts\TimeStampableInterface;
+use App\Entity\Contracts\TimeTravelInterface;
+use App\Entity\LogSystem\AbstractLogEntry;
+use App\Entity\LogSystem\CollectionElementDeleted;
+use App\Entity\LogSystem\ElementEditedLogEntry;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Mapping\ClassMetadata;
+
+class TimeTravel
+{
+    protected $em;
+    protected $repo;
+
+    public function __construct(EntityManagerInterface $em)
+    {
+        $this->em = $em;
+        $this->repo = $em->getRepository(AbstractLogEntry::class);
+    }
+
+    /**
+     * Undeletes the element with the given ID.
+     * @param  string  $class  The class name of the element that should be undeleted
+     * @param  int  $id  The ID of the element that should be undeleted.
+     * @return AbstractDBElement
+     */
+    public function undeleteEntity(string $class, int $id): AbstractDBElement
+    {
+        $log = $this->repo->getUndeleteDataForElement($class, $id);
+        $element = new $class();
+        $this->applyEntry($element, $log);
+
+        //Set internal ID so the element can be reverted
+        $this->setField($element, 'id', $id);
+
+        //Let database determine when it will be created
+        $this->setField($element,'addedDate', null);
+
+        return $element;
+    }
+
+    /**
+     * Revert the given element to the state it has on the given timestamp
+     * @param  AbstractDBElement  $element
+     * @param  \DateTime  $timestamp
+     * @param  AbstractLogEntry[]  $reverted_elements
+     * @throws \Exception
+     */
+    public function revertEntityToTimestamp(AbstractDBElement $element, \DateTime $timestamp, array $reverted_elements = [])
+    {
+        if (!$element instanceof TimeStampableInterface) {
+            throw new \InvalidArgumentException('$element must have a Timestamp!');
+        }
+
+        if ($timestamp > new \DateTime('now')) {
+            throw new \InvalidArgumentException('You can not travel to the future (yet)...');
+        }
+
+        //Skip this process if already were reverted...
+        if (in_array($element, $reverted_elements)) {
+            return;
+        }
+        $reverted_elements[] = $element;
+
+        $history = $this->repo->getTimetravelDataForElement($element, $timestamp);
+
+        /*
+        if (!$this->repo->getElementExistedAtTimestamp($element, $timestamp)) {
+            $element = null;
+            return;
+        }*/
+
+        foreach ($history as $logEntry) {
+            if ($logEntry instanceof ElementEditedLogEntry) {
+                $this->applyEntry($element, $logEntry);
+            }
+            if ($logEntry instanceof CollectionElementDeleted) {
+                //Undelete element and add it to collection again
+                $undeleted = $this->undeleteEntity(
+                    $logEntry->getDeletedElementClass(),
+                    $logEntry->getDeletedElementID()
+                );
+                if ($this->repo->getElementExistedAtTimestamp($undeleted, $timestamp)) {
+                    $this->revertEntityToTimestamp($undeleted, $timestamp, $reverted_elements);
+                    $collection = $this->getField($element, $logEntry->getCollectionName());
+                    if ($collection instanceof Collection) {
+                        $collection->add($undeleted);
+                    }
+                }
+            }
+        }
+
+        // Revert any of the associated elements
+        $metadata = $this->em->getClassMetadata(get_class($element));
+        $associations = $metadata->getAssociationMappings();
+        foreach ($associations as $field => $mapping) {
+            if (
+                ($element instanceof AbstractStructuralDBElement && ($field === 'parts' || $field === 'children'))
+                || ($element instanceof AttachmentType && $field === 'attachments')
+            ) {
+                continue;
+            }
+
+
+            //Revert many to one association (one element in property)
+            if (
+                $mapping['type'] === ClassMetadata::MANY_TO_ONE
+                || $mapping['type'] === ClassMetadata::ONE_TO_ONE
+            ) {
+                $target_element = $this->getField($element, $field);
+                if ($target_element !== null && $element->getLastModified() > $timestamp) {
+                    $this->revertEntityToTimestamp($target_element, $timestamp, $reverted_elements);
+                }
+            } elseif ( //Revert *_TO_MANY associations (collection properties)
+                ($mapping['type'] === ClassMetadata::MANY_TO_MANY
+                    || $mapping['type'] === ClassMetadata::ONE_TO_MANY)
+                && $mapping['isOwningSide'] === false
+            ) {
+                $target_elements = $this->getField($element, $field);
+                if ($target_elements === null || count($target_elements) > 10) {
+                    continue;
+                }
+                foreach ($target_elements as $target_element) {
+                    if ($target_element !== null && $element->getLastModified() >= $timestamp) {
+                        //Remove the element from collection, if it did not existed at $timestamp
+                        if (!$this->repo->getElementExistedAtTimestamp($target_element, $timestamp)) {
+                            if ($target_elements instanceof Collection) {
+                                $target_elements->removeElement($target_element);
+                            }
+                        }
+                        $this->revertEntityToTimestamp($target_element, $timestamp, $reverted_elements);
+                    }
+                }
+            }
+
+        }
+    }
+
+    /**
+     * Apply the changeset in the given LogEntry to the element
+     * @param  AbstractDBElement  $element
+     * @param  TimeTravelInterface  $logEntry
+     * @throws \Doctrine\ORM\Mapping\MappingException
+     */
+    public function applyEntry(AbstractDBElement $element, TimeTravelInterface $logEntry): void
+    {
+        //Skip if this does not provide any info...
+        if (!$logEntry->hasOldDataInformations()) {
+            return;
+        }
+        if (!$element instanceof TimeStampableInterface) {
+            return;
+        }
+        $metadata = $this->em->getClassMetadata(get_class($element));
+        $old_data = $logEntry->getOldData();
+
+        foreach ($old_data as $field => $data) {
+            if ($metadata->hasField($field)) {
+                $this->setField($element, $field, $data);
+            }
+            if ($metadata->hasAssociation($field)) {
+                $mapping = $metadata->getAssociationMapping($field);
+                $target_class = $mapping['targetEntity'];
+                //Try to extract the old ID:
+                if (is_array($data) && isset($data['@id'])) {
+                    $entity = $this->em->getPartialReference($target_class, $data['@id']);
+                    $this->setField($element, $field, $entity);
+                }
+            }
+        }
+
+        $this->setField($element, 'lastModified', $logEntry->getTimestamp());
+    }
+
+    protected function getField(AbstractDBElement $element, string $field)
+    {
+        $reflection = new \ReflectionClass(get_class($element));
+        $property = $reflection->getProperty($field);
+        $property->setAccessible(true);
+        return $property->getValue($element);
+    }
+
+    protected function setField(AbstractDBElement $element, string $field, $new_value)
+    {
+        $reflection = new \ReflectionClass(get_class($element));
+        $property = $reflection->getProperty($field);
+        $property->setAccessible(true);
+        $property->setValue($element, $new_value);
+    }
+}

templates/AdminPages/EntityAdminBase.html.twig

@@ -1,5 +1,15 @@
 {% extends "main_card.html.twig" %}
 
+{% block card_type %}
+    {% if timeTravel is defined and timeTravel is not null %}
+        bg-primary-striped text-white
+    {% else %}
+        bg-primary text-white
+    {% endif %}
+{% endblock %}
+
+{% form_theme form.log_comment 'bootstrap_4_layout.html.twig' %}
+
 {% block card_content %}
     <div class="row">
         <div class="col-sm-4">
@@ -33,16 +43,25 @@
                 <legend>
                     {% if entity.ID %}
                         <strong>{% trans with {'%name': entity.name} %}edit.caption{% endtrans %}</strong>
+                        {% if timeTravel is defined and timeTravel is not null %}
+                            ({{ timeTravel|format_datetime('short') }})
+                        {% endif %}
                     {% else %}
                         <strong>{% trans %}new.caption{% endtrans %}</strong>
                     {% endif %}
                 </legend>
+                {% if timeTravel is defined and timeTravel is not null %}
+                <b>{% trans with {'%timestamp%': timeTravel|format_datetime('short')} %}part.info.timetravel_hint{% endtrans %}</b>
+                {% endif %}
 
                 {{ form_errors(form) }}
 
                 <ul class="nav nav-tabs mt-2">
                     <li class="nav-item"><a class="link-anchor active nav-link" data-toggle="tab" href="#home">{% trans %}standard.label{% endtrans %}</a></li>
                     <li class="nav-item"><a data-toggle="tab" class="link-anchor nav-link" href="#info">{% trans %}infos.label{% endtrans %}</a></li>
+                    {% if datatable is defined %}
+                        <li class="nav-item {% if datatable is null %}not-allowed{% endif %}"><a data-toggle="tab" class="link-anchor nav-link {% if datatable is null %}disabled{% endif %}" href="#history">{% trans %}history.label{% endtrans %}</a></li>
+                    {% endif %}
                     {% if entity.id %}
                         <li class="nav-item"><a data-toggle="tab" class="link-anchor nav-link" href="#export">{% trans %}export.label{% endtrans %}</a> </li>
                     {% else %}
@@ -73,7 +92,7 @@
                             <div class="tab-pane active" id="common">
                                 {{ form_row(form.name) }}
                                 {% if form.parent%}
-                                   {{ form_row(form.parent) }}
+                                    {{ form_row(form.parent) }}
                                 {% endif %}
                                 {% if form.not_selectable is defined %}
                                     {{ form_row(form.not_selectable) }}
@@ -82,7 +101,7 @@
                                 {% block additional_controls %}{% endblock %}
 
                                 {% block comment %}
-                                {{ form_row(form.comment) }}
+                                    {{ form_row(form.comment) }}
                                 {% endblock %}
 
                             </div>
@@ -96,7 +115,21 @@
                             </div>
                         </div>
 
-                        {{ form_row(form.save) }}
+                        <div class="form-group row">
+                            <div class="col-sm-9 offset-sm-3">
+                                <div class="btn-group">
+                                    {{ form_widget(form.save) }}
+                                    <button type="button" class="btn {% if entity.id is not null %}btn-primary{% else %}btn-success{% endif %} dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                        <span class="sr-only">Toggle Dropdown</span>
+                                    </button>
+                                    <div class="dropdown-menu p-2">
+                                        {{ form_row(form.log_comment)}}
+                                    </div>
+                                </div>
+
+                            </div>
+                        </div>
+
                         {{ form_row(form.reset) }}
                         {{ form_end(form) }}
 
@@ -112,11 +145,15 @@
                         {% include "AdminPages/_info.html.twig" %}
                     </div>
 
-
+                    {% if datatable is defined and datatable is not null %}
+                        <div id="history" class="tab-pane fade">
+                            {% include "LogSystem/_log_table.html.twig" %}
+                        </div>
+                    {% endif %}
 
                     {% if entity.id %}
                         <div id="export" class="tab-pane fade">
-                            {% include 'AdminPages/_export_form.html.twig' with {'path' : path('attachment_type_export', {'id': entity.id})} %}
+                            {% include 'AdminPages/_export_form.html.twig' with {'path' : path(route_base ~ '_export', {'id': entity.id})} %}
                         </div>
                     {% else %} {# For new element we have a combined import/export tab #}
                         <div id="import_export" class="tab-pane fade">

templates/AdminPages/_delete_form.html.twig

@@ -7,12 +7,22 @@
         <div class=""></div>
         <div class="col-sm offset-sm-3 pl-2">
             {% set delete_disabled = (not is_granted("delete", entity)) or (entity.group is defined and entity.id == 1) %}
-            <button class="btn btn-danger" {% if delete_disabled %}disabled{% endif %}>{% trans %}entity.delete{% endtrans %}</button>
-            {% if entity.parent is defined  %}
-            <div class="ml-2 custom-control custom-checkbox custom-control-inline">
-                <input type="checkbox" class="custom-control-input" id="recursive" name="delete_recursive">
-                <label class="custom-control-label" for="recursive">{% trans %}entity.delete.recursive{% endtrans %}</label>
+            <div class="btn-group">
+                <button class="btn btn-danger" {% if delete_disabled %}disabled{% endif %}>{% trans %}entity.delete{% endtrans %}</button>
+                <button type="button" class="btn btn-danger dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                    <span class="sr-only">Toggle Dropdown</span>
+                </button>
+                <div class="dropdown-menu p-2">
+                    <div class="form-group"><label for="delete_log_comment">{% trans %}edit.log_comment{% endtrans %}</label>
+                        <input type="text" id="delete_log_comment" name="log_comment" class="form-control">
+                    </div>
+                </div>
             </div>
+            {% if entity.parent is defined  %}
+                <div class="ml-2 custom-control custom-checkbox custom-control-inline">
+                    <input type="checkbox" class="custom-control-input" id="recursive" name="delete_recursive">
+                    <label class="custom-control-label" for="recursive">{% trans %}entity.delete.recursive{% endtrans %}</label>
+                </div>
             {% endif %}
         </div>
     </div>

templates/LogSystem/_log_table.html.twig

@@ -0,0 +1,14 @@
+<form method="post" action="{{ url("log_undo") }}" data-delete-form data-title="{% trans %}log.undo.confirm_title{% endtrans %}"
+      data-message="{% trans %}log.undo.confirm_message{% endtrans %}">
+    <input type="hidden" name="redirect_back" value="{{ app.request.uri }}">
+    <div id="part_list" class="" data-datatable data-settings='{{ datatable_settings(datatable) }}'>
+        <div class="card-body">
+            <div class="card">
+                <div class="card-body">
+                    <h4>{% trans %}part_list.loading.caption{% endtrans %}</h4>
+                    <h6>{% trans %}part_list.loading.message{% endtrans %}</h6>
+                </div>
+            </div>
+        </div>
+    </div>
+</form>

templates/LogSystem/log_list.html.twig

@@ -3,14 +3,5 @@
 {% block title %}{% trans %}log.list.title{% endtrans %}{% endblock %}
 
 {% block content %}
-    <div id="part_list" class="" data-datatable data-settings='{{ datatable_settings(datatable) }}'>
-        <div class="card-body">
-            <div class="card">
-                <div class="card-body">
-                    <h4>{% trans %}part_list.loading.caption{% endtrans %}</h4>
-                    <h6>{% trans %}part_list.loading.message{% endtrans %}</h6>
-                </div>
-            </div>
-        </div>
-    </div>
+    {% include "LogSystem/_log_table.html.twig" %}
 {% endblock %}

templates/Parts/edit/edit_part_info.html.twig

@@ -84,11 +84,23 @@
         <div class="tab-pane fade p-2" id="comment" role="tabpanel">
             {{ form_widget(form.comment)}}
         </div>
-
-
-
     </div>
-    {{ form_row(form.save) }}
+
+    <div class="form-group row">
+        <div class="col-sm-9 offset-sm-3">
+            <div class="btn-group">
+                {{ form_widget(form.save) }}
+                <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                    <span class="sr-only">Toggle Dropdown</span>
+                </button>
+                <div class="dropdown-menu p-2">
+                    {{ form_row(form.log_comment)}}
+                </div>
+            </div>
+
+        </div>
+    </div>
+
     {{ form_row(form.reset) }}
     {{ form_errors(form) }}
     {{ form_end(form) }}

templates/Parts/info/_history.html.twig

@@ -0,0 +1,5 @@
+<div class="mt-2">
+    {% if datatable is not null %}
+        {% include "LogSystem/_log_table.html.twig" %}
+    {% endif %}
+</div>

templates/Parts/info/_main_infos.html.twig

@@ -23,7 +23,9 @@
         </h5>
         <h3>{{ part.name }}
             {# You need edit permission to use the edit button #}
-            {% if is_granted('edit', part) %}
+            {% if timeTravel is not null %}
+                <a href="{{ part|entityURL('info') }}"><i title="{% trans %}part.back_to_info{% endtrans %}" class="fas fa-fw fa-arrow-circle-left"></i></a>
+            {% elseif is_granted('edit', part) %}
                 <a href="{{ part|entityURL('edit') }}"><i class="fas fa-fw fa-sm fa-edit"></i></a>
             {% endif %}
         </h3>

templates/Parts/info/_sidebar.html.twig

@@ -1,5 +1,9 @@
 {% import "helper.twig" as helper %}
 
+{% if timeTravel is not null %}
+    <b class="mb-2">{% trans with {'%timestamp%': timeTravel|format_datetime('short')} %}part.info.timetravel_hint{% endtrans %}</b>
+{% endif %}
+
 <div class="mb-3">
 <span class="text-muted" title="{% trans %}lastModified{% endtrans %}">
     <i class="fas fa-history fa-fw"></i>  {{ helper.date_user_combination(part, true) }}

templates/Parts/info/_tools.html.twig

@@ -31,9 +31,19 @@
     <input type="hidden" name="_method" value="DELETE">
     <input type="hidden" name="_token" value="{{ csrf_token('delete' ~ part.id) }}">
     <div class="form-group">
-        <button class="btn btn-danger" {% if not is_granted("delete", part) %}disabled{% endif %}>
-        <i class="fa fa-trash fa-fw"></i>
-        {% trans %}part.delete{% endtrans %}
-        </button>
+        <div class="btn-group">
+            <button class="btn btn-danger" {% if not is_granted("delete", part) %}disabled{% endif %}>
+                <i class="fa fa-trash fa-fw"></i>
+                {% trans %}part.delete{% endtrans %}
+            </button>
+            <button type="button" class="btn btn-danger dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                <span class="sr-only">Toggle Dropdown</span>
+            </button>
+            <div class="dropdown-menu p-2">
+                <div class="form-group"><label for="delete_log_comment">{% trans %}edit.log_comment{% endtrans %}</label>
+                    <input type="text" id="delete_log_comment" name="log_comment" class="form-control">
+                </div>
+            </div>
+        </div>
     </div>
 </form>

templates/Parts/info/show_part_info.html.twig

@@ -4,16 +4,28 @@
     {% trans %}part.info.title{% endtrans %} {{ part.name }}
 {% endblock %}
 
+{% block card_type %}
+
+    {% if timeTravel == null %}
+        bg-primary text-white
+    {% else %}
+        bg-primary-striped text-white
+    {% endif %}
+
+{% endblock %}
+
 {% block card_title %}
     <i class="fa {{ part.favorite ? 'fa-star' : 'fa-info-circle'}} fa-fw" aria-hidden="true"></i>
     {% trans %}part.info.title{% endtrans %} <b>"{{ part.name }}"</b>
+    {% if timeTravel != null %}
+        <i>({{ timeTravel | format_datetime('short') }})</i>
+    {% endif %}
     <div class="float-right">
         {% trans %}id.label{% endtrans %}: {{ part.id }}
     </div>
 {% endblock %}
 
 {% block card_content %}
-
     <div class="row">
         <div class="col-md-9">
             {% include "Parts/info/_main_infos.html.twig" %}
@@ -28,14 +40,14 @@
     <div class="">
         <div class="">
             <ul class="nav nav-tabs" id="partTab" role="tablist">
-                    <li class="nav-item">
-                        <a class="nav-link {% if part.partLots %}active{% endif %}" id="part_lots-tab" data-toggle="tab"
-                           href="#part_lots" role="tab">
-                            <i class="fas fa-box fa-fw"></i>
-                            {% trans %}part.part_lots.label{% endtrans %}
-                            <span class="badge badge-secondary">{{ part.partLots | length }}</span>
-                        </a>
-                    </li>
+                <li class="nav-item">
+                    <a class="nav-link {% if part.partLots %}active{% endif %}" id="part_lots-tab" data-toggle="tab"
+                       href="#part_lots" role="tab">
+                        <i class="fas fa-box fa-fw"></i>
+                        {% trans %}part.part_lots.label{% endtrans %}
+                        <span class="badge badge-secondary">{{ part.partLots | length }}</span>
+                    </a>
+                </li>
                 {% if part.comment is not empty %}
                     <li class="nav-item">
                         <a class="nav-link" id="comment-tab" data-toggle="tab"
@@ -60,8 +72,8 @@
                         <span class="badge badge-secondary">{{ part.orderdetails | length }}</span>
                     </a>
                 </li>
-                <li class="nav-item">
-                    <a class="nav-link" id="history-tab" data-toggle="tab" href="#history" role="tab">
+                <li class="nav-item {% if datatable is null %}not-allowed{% endif %}">
+                    <a class="nav-link {% if datatable is null %}disabled{% endif %}" id="history-tab" data-toggle="tab" href="#history" role="tab">
                         <i class="fas fa-history"></i>
                         {% trans %}vendor.partinfo.history{% endtrans %}
                     </a>
@@ -102,13 +114,11 @@
                 </div>
 
                 <div class="tab-pane fade" id="history" role="tabpanel" aria-labelledby="history-tab">
-                    TODO
+                    {% include "Parts/info/_history.html.twig" %}
                 </div>
 
                 <div class="tab-pane fade" id="tools" role="tabpanel" aria-labelledby="tools-tab">
-
                     {% include "Parts/info/_tools.html.twig" %}
-
                 </div>
 
                 <div class="tab-pane fade" id="extended_info" role="tabpanel" aria-labelledby="extended_info-tab">

templates/homepage.html.twig

@@ -39,4 +39,13 @@
             {% trans %} homepage.others {% endtrans %}
         </div>
     </div>
+
+    {% if datatable is not null %}
+    <div class="card mt-3">
+        <div class="card-header"><i class="fas fa-fw fa-history"></i> {% trans %}homepage.last_activity{% endtrans %}</div>
+        <div class="card-body">
+            {% include "LogSystem/_log_table.html.twig" %}
+        </div>
+    </div>
+    {% endif %}
 {% endblock %}

tests/Entity/UserSystem/PermissionsEmbedTest.php

@@ -137,14 +137,6 @@ class PermissionsEmbedTest extends TestCase
         $embed->getPermissionValue('parts', 1);
     }
 
-    public function testInvalidBit3(): void
-    {
-        $embed = new PermissionsEmbed();
-        //When encoutering an too high bit number it must throw an error.
-        $this->expectException(InvalidArgumentException::class);
-        $embed->getPermissionValue('parts', 32);
-    }
-
     public function getStatesBINARY()
     {
         return [

tests/Services/LogSystem/EventCommentHelperTest.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Tests\Services\LogSystem;
+
+use App\Services\LogSystem\EventCommentHelper;
+use App\Services\LogSystem\EventLogger;
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class EventCommentHelperTest extends WebTestCase
+{
+    /**
+     * @var EventCommentHelper
+     */
+    protected $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp(); // TODO: Change the autogenerated stub
+
+        //Get an service instance.
+        self::bootKernel();
+        $this->service = self::$container->get(EventCommentHelper::class);
+    }
+
+    public function testInitialState()
+    {
+        $this->assertNull($this->service->getMessage());
+        $this->assertFalse($this->service->isMessageSet());
+    }
+
+    public function testClearMessage()
+    {
+        $this->service->setMessage('Test');
+        $this->assertTrue($this->service->isMessageSet());
+        $this->service->clearMessage();
+        $this->assertFalse($this->service->isMessageSet());
+    }
+
+    public function testGetSetMessage()
+    {
+        $this->service->setMessage('Test');
+        $this->assertSame('Test', $this->service->getMessage());
+    }
+
+    public function testIsMessageSet()
+    {
+        $this->service->setMessage('Test');
+        $this->assertTrue($this->service->isMessageSet());
+        $this->service->clearMessage();
+        $this->assertFalse($this->service->isMessageSet());
+    }
+}

translations/SchebTwoFactorBundle+intl-icu.de.xlf

@@ -1,11 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<xliff xmlns="urn:oasis:names:tc:xliff:document:2.0" version="2.0" srcLang="en" trgLang="de">
-  <file id="SchebTwoFactorBundle.de">
-    <unit id="QoghNQ6" name="login">
-      <segment>
+<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" version="1.2">
+  <file source-language="en" target-language="de" datatype="plaintext" original="file.ext">
+    <header>
+      <tool tool-id="symfony" tool-name="Symfony"/>
+    </header>
+    <body>
+      <trans-unit id="QoghNQ6" resname="login">
         <source>login</source>
         <target>Login</target>
-      </segment>
-    </unit>
+      </trans-unit>
+    </body>
   </file>
 </xliff>

translations/SchebTwoFactorBundle.de.xlf

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xliff xmlns="urn:oasis:names:tc:xliff:document:2.0" version="2.0" srcLang="en" trgLang="de">
+  <file id="SchebTwoFactorBundle.de">
+    <unit id="QoghNQ6" name="login">
+      <notes>
+        <note category="file-source" priority="1">Part-DB1\templates\security\2fa_base_form.html.twig:52</note>
+      </notes>
+      <segment>
+        <source>login</source>
+        <target>Login</target>
+      </segment>
+    </unit>
+  </file>
+</xliff>

translations/SchebTwoFactorBundle.en.xlf

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xliff xmlns="urn:oasis:names:tc:xliff:document:2.0" version="2.0" srcLang="en" trgLang="en">
+  <file id="SchebTwoFactorBundle.en">
+    <unit id="QoghNQ6" name="login">
+      <notes>
+        <note category="file-source" priority="1">Part-DB1\templates\security\2fa_base_form.html.twig:52</note>
+      </notes>
+      <segment>
+        <source>login</source>
+        <target>Login</target>
+      </segment>
+    </unit>
+  </file>
+</xliff>

translations/security.de.xlf

@@ -3,6 +3,7 @@
   <file id="security.de">
     <unit id="baI_ZxO" name="An authentication exception occurred.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -12,6 +13,7 @@
     </unit>
     <unit id="OETylMq" name="Authentication credentials could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -21,6 +23,7 @@
     </unit>
     <unit id="3RJINQ0" name="Authentication request could not be processed due to a system problem.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -30,6 +33,7 @@
     </unit>
     <unit id="qr0aiUo" name="Invalid credentials.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -39,6 +43,7 @@
     </unit>
     <unit id="zrJWK0F" name="Cookie has already been used by someone else.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -48,6 +53,7 @@
     </unit>
     <unit id="blC0fXX" name="Not privileged to request the resource.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -57,6 +63,7 @@
     </unit>
     <unit id="dLzMRPR" name="Invalid CSRF token.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -66,6 +73,7 @@
     </unit>
     <unit id="PhhlLem" name="No authentication provider found to support the authentication token.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -75,6 +83,7 @@
     </unit>
     <unit id="v_RS21A" name="No session available, it either timed out or cookies are not enabled.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -84,6 +93,7 @@
     </unit>
     <unit id="EYCKpDH" name="No token could be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -93,6 +103,7 @@
     </unit>
     <unit id="z3cOUZo" name="Username could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -102,6 +113,7 @@
     </unit>
     <unit id="By5eLYM" name="Account has expired.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -111,6 +123,7 @@
     </unit>
     <unit id="YfZhiuA" name="Credentials have expired.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -120,6 +133,7 @@
     </unit>
     <unit id="NrSSfLs" name="Account is disabled.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -129,6 +143,7 @@
     </unit>
     <unit id="O5ZyxHr" name="Account is locked.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>

translations/security.en.xlf

@@ -3,6 +3,7 @@
   <file id="security.en">
     <unit id="baI_ZxO" name="An authentication exception occurred.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -12,6 +13,7 @@
     </unit>
     <unit id="OETylMq" name="Authentication credentials could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -21,6 +23,7 @@
     </unit>
     <unit id="3RJINQ0" name="Authentication request could not be processed due to a system problem.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -30,6 +33,7 @@
     </unit>
     <unit id="qr0aiUo" name="Invalid credentials.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -39,6 +43,7 @@
     </unit>
     <unit id="zrJWK0F" name="Cookie has already been used by someone else.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -48,6 +53,7 @@
     </unit>
     <unit id="blC0fXX" name="Not privileged to request the resource.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -57,6 +63,7 @@
     </unit>
     <unit id="dLzMRPR" name="Invalid CSRF token.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -66,6 +73,7 @@
     </unit>
     <unit id="PhhlLem" name="No authentication provider found to support the authentication token.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -75,6 +83,7 @@
     </unit>
     <unit id="v_RS21A" name="No session available, it either timed out or cookies are not enabled.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -84,6 +93,7 @@
     </unit>
     <unit id="EYCKpDH" name="No token could be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -93,6 +103,7 @@
     </unit>
     <unit id="z3cOUZo" name="Username could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -102,6 +113,7 @@
     </unit>
     <unit id="By5eLYM" name="Account has expired.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -111,6 +123,7 @@
     </unit>
     <unit id="YfZhiuA" name="Credentials have expired.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -120,6 +133,7 @@
     </unit>
     <unit id="NrSSfLs" name="Account is disabled.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -129,6 +143,7 @@
     </unit>
     <unit id="O5ZyxHr" name="Account is locked.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>

translations/validators.de.xlf

@@ -5,9 +5,9 @@
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentContainingDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\Company.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\PartsContainingDBElement.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\StructuralDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
@@ -20,6 +20,22 @@
         <note category="file-source" priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Manufacturer.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\MeasurementUnit.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Part.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Storelocation.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
       </notes>
       <segment>
         <source>part.master_attachment.must_be_picture</source>
@@ -29,9 +45,9 @@
     <unit id="VJHTkxx" name="structural.entity.unique_name">
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\Company.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\PartsContainingDBElement.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\StructuralDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
@@ -41,6 +57,19 @@
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Manufacturer.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\MeasurementUnit.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Storelocation.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
         <note priority="1">src\Entity\AttachmentType.php:0</note>
         <note priority="1">src\Entity\Category.php:0</note>
         <note priority="1">src\Entity\Company.php:0</note>
@@ -61,14 +90,26 @@
     <unit id="isXL.ie" name="validator.user.username_already_used">
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
       </notes>
       <segment>
         <source>validator.user.username_already_used</source>
         <target></target>
       </segment>
     </unit>
+    <unit id="NcM463r" name="user.invalid_username">
+      <notes>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+      </notes>
+      <segment>
+        <source>user.invalid_username</source>
+        <target>Der Benutzername darf nur Buchstaben, Zahlen, Unterstriche, Punkte, Plus- oder Minuszeichen enthalten.</target>
+      </segment>
+    </unit>
     <unit id="zh5oKD9" name="This value should be false.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -78,6 +119,7 @@
     </unit>
     <unit id="NN2_iru" name="This value should be true.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -87,6 +129,7 @@
     </unit>
     <unit id="OjM_kpf" name="This value should be of type {{ type }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -96,6 +139,7 @@
     </unit>
     <unit id="f0P5pBD" name="This value should be blank.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -105,6 +149,7 @@
     </unit>
     <unit id="ih.4TRN" name="The value you selected is not a valid choice.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -114,6 +159,7 @@
     </unit>
     <unit id="u81CkP8" name="0d999f2">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -123,6 +169,7 @@
     </unit>
     <unit id="nIvOQ_o" name="0824486">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -132,6 +179,7 @@
     </unit>
     <unit id="87zjiHi" name="One or more of the given values is invalid.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -141,6 +189,7 @@
     </unit>
     <unit id="3NeQftv" name="This field was not expected.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -150,6 +199,7 @@
     </unit>
     <unit id="SwMV4zp" name="This field is missing.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -159,6 +209,7 @@
     </unit>
     <unit id="LO2vFKN" name="This value is not a valid date.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -168,6 +219,7 @@
     </unit>
     <unit id="86dU_nv" name="This value is not a valid datetime.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -177,6 +229,7 @@
     </unit>
     <unit id="PSvNXdi" name="This value is not a valid email address.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -186,6 +239,7 @@
     </unit>
     <unit id="3KeHbZy" name="The file could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -195,6 +249,7 @@
     </unit>
     <unit id="KtJhQZo" name="The file is not readable.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -204,6 +259,7 @@
     </unit>
     <unit id="JocOVM2" name="1ad411a">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -213,6 +269,7 @@
     </unit>
     <unit id="YW21SPH" name="30a318d">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -222,6 +279,7 @@
     </unit>
     <unit id="NubOmrs" name="This value should be {{ limit }} or less.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -231,6 +289,7 @@
     </unit>
     <unit id="HX7TOFm" name="0e0c1e1">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -240,6 +299,7 @@
     </unit>
     <unit id="qgR8M_U" name="This value should be {{ limit }} or more.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -249,6 +309,7 @@
     </unit>
     <unit id="ekfrU.c" name="5188ff9">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -258,6 +319,7 @@
     </unit>
     <unit id="1KV4L.t" name="This value should not be blank.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -267,6 +329,7 @@
     </unit>
     <unit id="2G4Vepm" name="This value should not be null.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -276,6 +339,7 @@
     </unit>
     <unit id="yDc3m6E" name="This value should be null.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -285,6 +349,7 @@
     </unit>
     <unit id="zKzWejA" name="This value is not valid.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -294,6 +359,7 @@
     </unit>
     <unit id="HSuBZpQ" name="This value is not a valid time.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -303,6 +369,7 @@
     </unit>
     <unit id="snWc_QT" name="This value is not a valid URL.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -312,6 +379,7 @@
     </unit>
     <unit id="jpaLsb2" name="The two values should be equal.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -321,6 +389,7 @@
     </unit>
     <unit id="fIlB1B_" name="The file is too large. Allowed maximum size is {{ limit }} {{ suffix }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -330,6 +399,7 @@
     </unit>
     <unit id="tW7o0t9" name="The file is too large.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -339,6 +409,7 @@
     </unit>
     <unit id=".exF5Ww" name="The file could not be uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -348,6 +419,7 @@
     </unit>
     <unit id="d7sS5yw" name="This value should be a valid number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -357,6 +429,7 @@
     </unit>
     <unit id="BS2Ez6i" name="This file is not a valid image.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -366,6 +439,7 @@
     </unit>
     <unit id="ydcT9kU" name="This is not a valid IP address.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -375,6 +449,7 @@
     </unit>
     <unit id="lDOGNFX" name="This value is not a valid language.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -384,6 +459,7 @@
     </unit>
     <unit id="y9IdYkA" name="This value is not a valid locale.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -393,6 +469,7 @@
     </unit>
     <unit id="1YC0pOd" name="This value is not a valid country.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -402,6 +479,7 @@
     </unit>
     <unit id="B5ebaMp" name="This value is already used.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -411,6 +489,7 @@
     </unit>
     <unit id="L6097a6" name="The size of the image could not be detected.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -420,6 +499,7 @@
     </unit>
     <unit id="zVtJJEa" name="266051e">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -429,6 +509,7 @@
     </unit>
     <unit id="s8LFQGC" name="c1c23f9">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -438,6 +519,7 @@
     </unit>
     <unit id="Z.NgqFj" name="9a128f7">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -447,6 +529,7 @@
     </unit>
     <unit id="AW1lWVM" name="8a4cd70">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -456,6 +539,7 @@
     </unit>
     <unit id="PSdMNab" name="This value should be the user's current password.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -465,6 +549,7 @@
     </unit>
     <unit id="gYImVyV" name="fd389d6">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -474,6 +559,7 @@
     </unit>
     <unit id="xJ2Bcr_" name="The file was only partially uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -483,6 +569,7 @@
     </unit>
     <unit id="HzkJDtF" name="No file was uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -492,6 +579,7 @@
     </unit>
     <unit id="mHfEaB3" name="No temporary folder was configured in php.ini.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -501,6 +589,7 @@
     </unit>
     <unit id="y9K3BGb" name="Cannot write temporary file to disk.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -510,6 +599,7 @@
     </unit>
     <unit id="kx3yHIM" name="A PHP extension caused the upload to fail.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -519,6 +609,7 @@
     </unit>
     <unit id="gTJYRl6" name="b54c218">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -528,6 +619,7 @@
     </unit>
     <unit id="FFn3lVn" name="949632c">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -537,6 +629,7 @@
     </unit>
     <unit id="bSdilZv" name="e0582dc">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -546,6 +639,7 @@
     </unit>
     <unit id="MAzmID7" name="Invalid card number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -555,6 +649,7 @@
     </unit>
     <unit id="c3REGK3" name="Unsupported card type or invalid card number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -564,6 +659,7 @@
     </unit>
     <unit id="XSVzcbV" name="This is not a valid International Bank Account Number (IBAN).">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -573,6 +669,7 @@
     </unit>
     <unit id="yHirwNr" name="This value is not a valid ISBN-10.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -582,6 +679,7 @@
     </unit>
     <unit id="c_q0_ua" name="This value is not a valid ISBN-13.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -591,6 +689,7 @@
     </unit>
     <unit id="M4FlD6n" name="This value is neither a valid ISBN-10 nor a valid ISBN-13.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -600,6 +699,7 @@
     </unit>
     <unit id="cuct0Ow" name="This value is not a valid ISSN.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -609,6 +709,7 @@
     </unit>
     <unit id="JBLs1a1" name="This value is not a valid currency.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -618,6 +719,7 @@
     </unit>
     <unit id="c.WxzFW" name="This value should be equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -627,6 +729,7 @@
     </unit>
     <unit id="_jdjkwq" name="This value should be greater than {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -636,6 +739,7 @@
     </unit>
     <unit id="o8A8a0H" name="This value should be greater than or equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -645,6 +749,7 @@
     </unit>
     <unit id="bOF1fpm" name="9670078">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -654,6 +759,7 @@
     </unit>
     <unit id="jG0QFKw" name="This value should be less than {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -663,6 +769,7 @@
     </unit>
     <unit id="9lWrKmm" name="This value should be less than or equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -672,6 +779,7 @@
     </unit>
     <unit id="ftTwGs." name="This value should not be equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -681,6 +789,7 @@
     </unit>
     <unit id="Bi22JLt" name="0eedf91">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -690,6 +799,7 @@
     </unit>
     <unit id="VczCWzQ" name="9c3ad0f">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -699,6 +809,7 @@
     </unit>
     <unit id="v57PXhq" name="4376d45">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -708,6 +819,7 @@
     </unit>
     <unit id="rpajj.a" name="The image is square ({{ width }}x{{ height }}px). Square images are not allowed.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -717,6 +829,7 @@
     </unit>
     <unit id="G_lu2qW" name="1dc128a">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -726,6 +839,7 @@
     </unit>
     <unit id="sFyGx4B" name="9e27714">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -735,6 +849,7 @@
     </unit>
     <unit id="jZgqcpL" name="An empty file is not allowed.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -744,6 +859,7 @@
     </unit>
     <unit id="bcfVezI" name="The host could not be resolved.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -753,6 +869,7 @@
     </unit>
     <unit id="NtzKvgt" name="This value does not match the expected {{ charset }} charset.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -762,6 +879,7 @@
     </unit>
     <unit id="Wi2y9.N" name="This is not a valid Business Identifier Code (BIC).">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -771,6 +889,7 @@
     </unit>
     <unit id="VKDowX6" name="Error">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -780,6 +899,7 @@
     </unit>
     <unit id="8zqt0Ik" name="This is not a valid UUID.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -789,6 +909,7 @@
     </unit>
     <unit id="ru.4wkH" name="This value should be a multiple of {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -798,6 +919,7 @@
     </unit>
     <unit id="M3vyK6s" name="This Business Identifier Code (BIC) is not associated with IBAN {{ iban }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -807,6 +929,7 @@
     </unit>
     <unit id="2v2xpAh" name="This value should be valid JSON.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -816,6 +939,7 @@
     </unit>
     <unit id="9CWVEGq" name="This collection should contain only unique elements.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -825,6 +949,7 @@
     </unit>
     <unit id="WdvZfq." name="This value should be positive.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -834,6 +959,7 @@
     </unit>
     <unit id="ubHMK2q" name="This value should be either positive or zero.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -843,6 +969,7 @@
     </unit>
     <unit id="IwNTzo_" name="This value should be negative.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -852,6 +979,7 @@
     </unit>
     <unit id="0GfwMfP" name="This value should be either negative or zero.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -861,6 +989,7 @@
     </unit>
     <unit id="fs3qQZR" name="This value is not a valid timezone.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -870,6 +999,7 @@
     </unit>
     <unit id="40dnsod" name="7e27e92">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -879,6 +1009,7 @@
     </unit>
     <unit id="VvxxWas" name="This value should be between {{ min }} and {{ max }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -886,8 +1017,27 @@
         <target>Dieser Wert sollte zwischen {{ min }} und {{ max }} sein.</target>
       </segment>
     </unit>
+    <unit id="7g313cV" name="This value is not a valid hostname.">
+      <notes>
+        <note category="state" priority="1">obsolete</note>
+      </notes>
+      <segment>
+        <source>This value is not a valid hostname.</source>
+        <target>Dieser Wert ist kein gültiger Hostname.</target>
+      </segment>
+    </unit>
+    <unit id="xwtBimR" name="d165c02">
+      <notes>
+        <note category="state" priority="1">obsolete</note>
+      </notes>
+      <segment>
+        <source>The number of elements in this collection should be a multiple of {{ compared_value }}.</source>
+        <target>Die Anzahl an Elementen in dieser Sammlung sollte ein Vielfaches von {{ compared_value }} sein.</target>
+      </segment>
+    </unit>
     <unit id=".SEaaBa" name="This form should not contain extra fields.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -897,6 +1047,7 @@
     </unit>
     <unit id="WPnLAh9" name="The uploaded file was too large. Please try to upload a smaller file.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -906,6 +1057,7 @@
     </unit>
     <unit id="fvxWW3V" name="The CSRF token is invalid. Please try to resubmit the form.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -915,6 +1067,7 @@
     </unit>
     <unit id="lZvhKYu" name="validator.noneofitschild.self">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -924,6 +1077,7 @@
     </unit>
     <unit id="pr07aV4" name="validator.noneofitschild.children">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -933,6 +1087,7 @@
     </unit>
     <unit id="0IF0VIF" name="validator.isSelectable">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -942,6 +1097,7 @@
     </unit>
     <unit id="nd207H6" name="validator.part_lot.location_full.no_increasment">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -951,6 +1107,7 @@
     </unit>
     <unit id="R6Ov4Yt" name="validator.part_lot.location_full">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -960,6 +1117,7 @@
     </unit>
     <unit id="6vIlN5q" name="validator.part_lot.only_existing">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -969,6 +1127,7 @@
     </unit>
     <unit id="BNQk2e7" name="validator.part_lot.single_part">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -976,11 +1135,5 @@
         <target>Der Lagerort wurde als "Nur ein Bauteil" markiert, daher kann kein neues Bauteil hinzugefügt werden.</target>
       </segment>
     </unit>
-    <unit id="NcM463r" name="user.invalid_username">
-      <segment>
-        <source>user.invalid_username</source>
-        <target>Der Benutzername darf nur Buchstaben, Zahlen, Unterstriche, Punkte, Plus- oder Minuszeichen enthalten.</target>
-      </segment>
-    </unit>
   </file>
 </xliff>

translations/validators.en.xlf

@@ -5,9 +5,9 @@
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentContainingDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\Company.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\PartsContainingDBElement.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\StructuralDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
@@ -20,6 +20,22 @@
         <note category="file-source" priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Manufacturer.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\MeasurementUnit.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Part.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Storelocation.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
       </notes>
       <segment>
         <source>part.master_attachment.must_be_picture</source>
@@ -29,9 +45,9 @@
     <unit id="VJHTkxx" name="structural.entity.unique_name">
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\Company.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\PartsContainingDBElement.php:0</note>
-        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\StructuralDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
@@ -41,6 +57,19 @@
         <note category="file-source" priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Attachments\AttachmentType.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractCompany.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractPartsContainingDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Base\AbstractStructuralDBElement.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Devices\Device.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Category.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Footprint.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Manufacturer.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\MeasurementUnit.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Storelocation.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\Parts\Supplier.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\PriceInformations\Currency.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\Group.php:0</note>
         <note priority="1">src\Entity\AttachmentType.php:0</note>
         <note priority="1">src\Entity\Category.php:0</note>
         <note priority="1">src\Entity\Company.php:0</note>
@@ -61,14 +90,26 @@
     <unit id="isXL.ie" name="validator.user.username_already_used">
       <notes>
         <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
       </notes>
       <segment>
         <source>validator.user.username_already_used</source>
         <target></target>
       </segment>
     </unit>
+    <unit id="NcM463r" name="user.invalid_username">
+      <notes>
+        <note category="file-source" priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+        <note priority="1">Part-DB1\src\Entity\UserSystem\User.php:0</note>
+      </notes>
+      <segment>
+        <source>user.invalid_username</source>
+        <target>The username must contain only letters, numbers, underscores, dots, pluses or minuses.</target>
+      </segment>
+    </unit>
     <unit id="zh5oKD9" name="This value should be false.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -78,6 +119,7 @@
     </unit>
     <unit id="NN2_iru" name="This value should be true.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -87,6 +129,7 @@
     </unit>
     <unit id="OjM_kpf" name="This value should be of type {{ type }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -96,6 +139,7 @@
     </unit>
     <unit id="f0P5pBD" name="This value should be blank.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -105,6 +149,7 @@
     </unit>
     <unit id="ih.4TRN" name="The value you selected is not a valid choice.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -114,6 +159,7 @@
     </unit>
     <unit id="u81CkP8" name="0d999f2">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -123,6 +169,7 @@
     </unit>
     <unit id="nIvOQ_o" name="0824486">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -132,6 +179,7 @@
     </unit>
     <unit id="87zjiHi" name="One or more of the given values is invalid.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -141,6 +189,7 @@
     </unit>
     <unit id="3NeQftv" name="This field was not expected.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -150,6 +199,7 @@
     </unit>
     <unit id="SwMV4zp" name="This field is missing.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -159,6 +209,7 @@
     </unit>
     <unit id="LO2vFKN" name="This value is not a valid date.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -168,6 +219,7 @@
     </unit>
     <unit id="86dU_nv" name="This value is not a valid datetime.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -177,6 +229,7 @@
     </unit>
     <unit id="PSvNXdi" name="This value is not a valid email address.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -186,6 +239,7 @@
     </unit>
     <unit id="3KeHbZy" name="The file could not be found.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -195,6 +249,7 @@
     </unit>
     <unit id="KtJhQZo" name="The file is not readable.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -204,6 +259,7 @@
     </unit>
     <unit id="JocOVM2" name="1ad411a">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -213,6 +269,7 @@
     </unit>
     <unit id="YW21SPH" name="30a318d">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -222,6 +279,7 @@
     </unit>
     <unit id="NubOmrs" name="This value should be {{ limit }} or less.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -231,6 +289,7 @@
     </unit>
     <unit id="HX7TOFm" name="0e0c1e1">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -240,6 +299,7 @@
     </unit>
     <unit id="qgR8M_U" name="This value should be {{ limit }} or more.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -249,6 +309,7 @@
     </unit>
     <unit id="ekfrU.c" name="5188ff9">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -258,6 +319,7 @@
     </unit>
     <unit id="1KV4L.t" name="This value should not be blank.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -267,6 +329,7 @@
     </unit>
     <unit id="2G4Vepm" name="This value should not be null.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -276,6 +339,7 @@
     </unit>
     <unit id="yDc3m6E" name="This value should be null.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -285,6 +349,7 @@
     </unit>
     <unit id="zKzWejA" name="This value is not valid.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -294,6 +359,7 @@
     </unit>
     <unit id="HSuBZpQ" name="This value is not a valid time.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -303,6 +369,7 @@
     </unit>
     <unit id="snWc_QT" name="This value is not a valid URL.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -312,6 +379,7 @@
     </unit>
     <unit id="jpaLsb2" name="The two values should be equal.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -321,6 +389,7 @@
     </unit>
     <unit id="fIlB1B_" name="The file is too large. Allowed maximum size is {{ limit }} {{ suffix }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -330,6 +399,7 @@
     </unit>
     <unit id="tW7o0t9" name="The file is too large.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -339,6 +409,7 @@
     </unit>
     <unit id=".exF5Ww" name="The file could not be uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -348,6 +419,7 @@
     </unit>
     <unit id="d7sS5yw" name="This value should be a valid number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -357,6 +429,7 @@
     </unit>
     <unit id="BS2Ez6i" name="This file is not a valid image.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -366,6 +439,7 @@
     </unit>
     <unit id="ydcT9kU" name="This is not a valid IP address.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -375,6 +449,7 @@
     </unit>
     <unit id="lDOGNFX" name="This value is not a valid language.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -384,6 +459,7 @@
     </unit>
     <unit id="y9IdYkA" name="This value is not a valid locale.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -393,6 +469,7 @@
     </unit>
     <unit id="1YC0pOd" name="This value is not a valid country.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -402,6 +479,7 @@
     </unit>
     <unit id="B5ebaMp" name="This value is already used.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -411,6 +489,7 @@
     </unit>
     <unit id="L6097a6" name="The size of the image could not be detected.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -420,6 +499,7 @@
     </unit>
     <unit id="zVtJJEa" name="266051e">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -429,6 +509,7 @@
     </unit>
     <unit id="s8LFQGC" name="c1c23f9">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -438,6 +519,7 @@
     </unit>
     <unit id="Z.NgqFj" name="9a128f7">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -447,6 +529,7 @@
     </unit>
     <unit id="AW1lWVM" name="8a4cd70">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -456,6 +539,7 @@
     </unit>
     <unit id="PSdMNab" name="This value should be the user's current password.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -465,6 +549,7 @@
     </unit>
     <unit id="gYImVyV" name="fd389d6">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -474,6 +559,7 @@
     </unit>
     <unit id="xJ2Bcr_" name="The file was only partially uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -483,6 +569,7 @@
     </unit>
     <unit id="HzkJDtF" name="No file was uploaded.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -492,6 +579,7 @@
     </unit>
     <unit id="mHfEaB3" name="No temporary folder was configured in php.ini.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -501,6 +589,7 @@
     </unit>
     <unit id="y9K3BGb" name="Cannot write temporary file to disk.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -510,6 +599,7 @@
     </unit>
     <unit id="kx3yHIM" name="A PHP extension caused the upload to fail.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -519,6 +609,7 @@
     </unit>
     <unit id="gTJYRl6" name="b54c218">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -528,6 +619,7 @@
     </unit>
     <unit id="FFn3lVn" name="949632c">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -537,6 +629,7 @@
     </unit>
     <unit id="bSdilZv" name="e0582dc">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -546,6 +639,7 @@
     </unit>
     <unit id="MAzmID7" name="Invalid card number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -555,6 +649,7 @@
     </unit>
     <unit id="c3REGK3" name="Unsupported card type or invalid card number.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -564,6 +659,7 @@
     </unit>
     <unit id="XSVzcbV" name="This is not a valid International Bank Account Number (IBAN).">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -573,6 +669,7 @@
     </unit>
     <unit id="yHirwNr" name="This value is not a valid ISBN-10.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -582,6 +679,7 @@
     </unit>
     <unit id="c_q0_ua" name="This value is not a valid ISBN-13.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -591,6 +689,7 @@
     </unit>
     <unit id="M4FlD6n" name="This value is neither a valid ISBN-10 nor a valid ISBN-13.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -600,6 +699,7 @@
     </unit>
     <unit id="cuct0Ow" name="This value is not a valid ISSN.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -609,6 +709,7 @@
     </unit>
     <unit id="JBLs1a1" name="This value is not a valid currency.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -618,6 +719,7 @@
     </unit>
     <unit id="c.WxzFW" name="This value should be equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -627,6 +729,7 @@
     </unit>
     <unit id="_jdjkwq" name="This value should be greater than {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -636,6 +739,7 @@
     </unit>
     <unit id="o8A8a0H" name="This value should be greater than or equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -645,6 +749,7 @@
     </unit>
     <unit id="bOF1fpm" name="9670078">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -654,6 +759,7 @@
     </unit>
     <unit id="jG0QFKw" name="This value should be less than {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -663,6 +769,7 @@
     </unit>
     <unit id="9lWrKmm" name="This value should be less than or equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -672,6 +779,7 @@
     </unit>
     <unit id="ftTwGs." name="This value should not be equal to {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -681,6 +789,7 @@
     </unit>
     <unit id="Bi22JLt" name="0eedf91">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -690,6 +799,7 @@
     </unit>
     <unit id="VczCWzQ" name="9c3ad0f">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -699,6 +809,7 @@
     </unit>
     <unit id="v57PXhq" name="4376d45">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -708,6 +819,7 @@
     </unit>
     <unit id="rpajj.a" name="The image is square ({{ width }}x{{ height }}px). Square images are not allowed.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -717,6 +829,7 @@
     </unit>
     <unit id="G_lu2qW" name="1dc128a">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -726,6 +839,7 @@
     </unit>
     <unit id="sFyGx4B" name="9e27714">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -735,6 +849,7 @@
     </unit>
     <unit id="jZgqcpL" name="An empty file is not allowed.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -744,6 +859,7 @@
     </unit>
     <unit id="bcfVezI" name="The host could not be resolved.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -753,6 +869,7 @@
     </unit>
     <unit id="NtzKvgt" name="This value does not match the expected {{ charset }} charset.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -762,6 +879,7 @@
     </unit>
     <unit id="Wi2y9.N" name="This is not a valid Business Identifier Code (BIC).">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -771,6 +889,7 @@
     </unit>
     <unit id="VKDowX6" name="Error">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -780,6 +899,7 @@
     </unit>
     <unit id="8zqt0Ik" name="This is not a valid UUID.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -789,6 +909,7 @@
     </unit>
     <unit id="ru.4wkH" name="This value should be a multiple of {{ compared_value }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -798,6 +919,7 @@
     </unit>
     <unit id="M3vyK6s" name="This Business Identifier Code (BIC) is not associated with IBAN {{ iban }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -807,6 +929,7 @@
     </unit>
     <unit id="2v2xpAh" name="This value should be valid JSON.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -816,6 +939,7 @@
     </unit>
     <unit id="9CWVEGq" name="This collection should contain only unique elements.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -825,6 +949,7 @@
     </unit>
     <unit id="WdvZfq." name="This value should be positive.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -834,6 +959,7 @@
     </unit>
     <unit id="ubHMK2q" name="This value should be either positive or zero.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -843,6 +969,7 @@
     </unit>
     <unit id="IwNTzo_" name="This value should be negative.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -852,6 +979,7 @@
     </unit>
     <unit id="0GfwMfP" name="This value should be either negative or zero.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -861,6 +989,7 @@
     </unit>
     <unit id="fs3qQZR" name="This value is not a valid timezone.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -870,6 +999,7 @@
     </unit>
     <unit id="40dnsod" name="7e27e92">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -879,6 +1009,7 @@
     </unit>
     <unit id="VvxxWas" name="This value should be between {{ min }} and {{ max }}.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -886,8 +1017,27 @@
         <target>This value should be between {{ min }} and {{ max }}.</target>
       </segment>
     </unit>
+    <unit id="7g313cV" name="This value is not a valid hostname.">
+      <notes>
+        <note category="state" priority="1">obsolete</note>
+      </notes>
+      <segment>
+        <source>This value is not a valid hostname.</source>
+        <target>This value is not a valid hostname.</target>
+      </segment>
+    </unit>
+    <unit id="xwtBimR" name="d165c02">
+      <notes>
+        <note category="state" priority="1">obsolete</note>
+      </notes>
+      <segment>
+        <source>The number of elements in this collection should be a multiple of {{ compared_value }}.</source>
+        <target>The number of elements in this collection should be a multiple of {{ compared_value }}.</target>
+      </segment>
+    </unit>
     <unit id=".SEaaBa" name="This form should not contain extra fields.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -897,6 +1047,7 @@
     </unit>
     <unit id="WPnLAh9" name="The uploaded file was too large. Please try to upload a smaller file.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -906,6 +1057,7 @@
     </unit>
     <unit id="fvxWW3V" name="The CSRF token is invalid. Please try to resubmit the form.">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -915,6 +1067,7 @@
     </unit>
     <unit id="lZvhKYu" name="validator.noneofitschild.self">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -924,6 +1077,7 @@
     </unit>
     <unit id="pr07aV4" name="validator.noneofitschild.children">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -933,6 +1087,7 @@
     </unit>
     <unit id="0IF0VIF" name="validator.isSelectable">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -942,6 +1097,7 @@
     </unit>
     <unit id="nd207H6" name="validator.part_lot.location_full.no_increasment">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -951,6 +1107,7 @@
     </unit>
     <unit id="R6Ov4Yt" name="validator.part_lot.location_full">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -960,6 +1117,7 @@
     </unit>
     <unit id="6vIlN5q" name="validator.part_lot.only_existing">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -969,6 +1127,7 @@
     </unit>
     <unit id="BNQk2e7" name="validator.part_lot.single_part">
       <notes>
+        <note priority="1">obsolete</note>
         <note category="state" priority="1">obsolete</note>
       </notes>
       <segment>
@@ -976,11 +1135,5 @@
         <target>The storage location was marked as "single part", so you can not add a new part to it.</target>
       </segment>
     </unit>
-    <unit id="NcM463r" name="user.invalid_username">
-      <segment>
-        <source>user.invalid_username</source>
-        <target>The username must contain only letters, numbers, underscores, dots, pluses or minuses.</target>
-      </segment>
-    </unit>
   </file>
 </xliff>