diff --git a/migrations/Version20260320071724.php b/migrations/Version20260320071724.php
new file mode 100644
index 0000000..6b5171a
--- /dev/null
+++ b/migrations/Version20260320071724.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260320071724 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add error_code column and index to log_entry table';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE log_entry ADD error_code VARCHAR(12) DEFAULT NULL');
+        $this->addSql('CREATE INDEX IDX_LOG_ENTRY_ERROR_CODE ON log_entry (error_code)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP INDEX IDX_LOG_ENTRY_ERROR_CODE ON log_entry');
+        $this->addSql('ALTER TABLE log_entry DROP error_code');
+    }
+}
diff --git a/src/Command/LogEntryBackfillErrorCodesCommand.php b/src/Command/LogEntryBackfillErrorCodesCommand.php
new file mode 100644
index 0000000..8e2c8ff
--- /dev/null
+++ b/src/Command/LogEntryBackfillErrorCodesCommand.php
@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Command;
+
+use App\Entity\LogEntry;
+use App\Repository\LogEntryRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+#[AsCommand(
+    name: 'app:log-entry:backfill-error-codes',
+    description: 'Backfills error_code column from extra data in existing log entries'
+)]
+class LogEntryBackfillErrorCodesCommand extends Command
+{
+    private const BATCH_SIZE = 100;
+
+    public function __construct(
+        private readonly LogEntryRepository $logEntryRepository,
+        private readonly EntityManagerInterface $entityManager,
+    ) {
+        parent::__construct();
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $io = new SymfonyStyle($input, $output);
+
+        $io->info('Starting backfill of error codes...');
+
+        $totalProcessed = 0;
+        $totalUpdated = 0;
+
+        while (true) {
+            $entries = $this->logEntryRepository->createQueryBuilder('l')
+                ->where('l.errorCode IS NULL')
+                ->andWhere('l.extra LIKE :pattern')
+                ->setParameter('pattern', '%error_code%')
+                ->orderBy('l.id', 'ASC')
+                ->setMaxResults(self::BATCH_SIZE)
+                ->getQuery()
+                ->getResult();
+
+            if ([] === $entries) {
+                break;
+            }
+
+            foreach ($entries as $entry) {
+                /** @var LogEntry $entry */
+                $extra = $entry->getExtra();
+                if (isset($extra['error_code']) && null === $entry->getErrorCode()) {
+                    $entry->setErrorCode($extra['error_code']);
+                    ++$totalUpdated;
+                }
+                ++$totalProcessed;
+            }
+
+            $this->entityManager->flush();
+            $this->entityManager->clear();
+
+            $io->writeln(sprintf('Processed %d entries, %d updated so far', $totalProcessed, $totalUpdated));
+        }
+
+        $message = sprintf('Backfill complete. Processed %d entries, updated %d with error codes.', $totalProcessed, $totalUpdated);
+        $io->success($message);
+
+        return Command::SUCCESS;
+    }
+}
diff --git a/src/Controller/Admin/LogEntryCrudController.php b/src/Controller/Admin/LogEntryCrudController.php
index e7b417a..2ba2928 100644
--- a/src/Controller/Admin/LogEntryCrudController.php
+++ b/src/Controller/Admin/LogEntryCrudController.php
@@ -4,16 +4,27 @@ declare(strict_types=1);
 
 namespace App\Controller\Admin;
 
+use App\Admin\Field\JsonDataField;
 use App\Entity\LogEntry;
+use App\Repository\LogEntryRepository;
+use App\Service\XmlDumpService;
 use EasyCorp\Bundle\EasyAdminBundle\Config\Action;
 use EasyCorp\Bundle\EasyAdminBundle\Config\Actions;
 use EasyCorp\Bundle\EasyAdminBundle\Config\Crud;
 use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;
 use EasyCorp\Bundle\EasyAdminBundle\Field\DateTimeField;
 use EasyCorp\Bundle\EasyAdminBundle\Field\TextField;
+use League\Flysystem\FilesystemException;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 
 class LogEntryCrudController extends AbstractCrudController
 {
+    public function __construct(
+        private readonly LogEntryRepository $logEntryRepository,
+    ) {
+    }
+
     public static function getEntityFqcn(): string
     {
         return LogEntry::class;
@@ -22,7 +33,7 @@ class LogEntryCrudController extends AbstractCrudController
     public function configureActions(Actions $actions): Actions
     {
         $viewDumps = Action::new('viewDumps', 'XML Dumps', 'fa fa-file-code')
-            ->linkToRoute('admin_xml_dump_list', static fn (LogEntry $entity): array => ['id' => $entity->getId()])
+            ->linkToCrudAction('xmlDumps')
             ->displayIf(static fn (LogEntry $entity): bool => 'bpn' === $entity->getChannel());
 
         return $actions
@@ -42,18 +53,45 @@ class LogEntryCrudController extends AbstractCrudController
         return $crud
             ->setEntityLabelInSingular('Logeintrag')
             ->setEntityLabelInPlural('Logeinträge')
-            ->setDefaultSort(['createdAt' => 'DESC']);
+            ->setDefaultSort(['createdAt' => 'DESC'])
+            ->setSearchFields(['errorCode', 'message', 'channel', 'extra']);
     }
 
     public function configureFields(string $pageName): iterable
     {
-        return [
-            DateTimeField::new('createdAt', 'Zeitstempel'),
-            TextField::new('errorCode', 'Fehlercode'),
-            TextField::new('username', 'Benutzer'),
-            TextField::new('message', 'Aktion'),
-            TextField::new('requestId', 'Request ID'),
-            TextField::new('uri', 'URI'),
-        ];
+        yield DateTimeField::new('createdAt', 'Zeitstempel');
+        yield TextField::new('errorCode', 'Fehlercode')
+            ->formatValue(static fn (?string $value): string => $value ?? '-');
+        yield TextField::new('username', 'Benutzer');
+        yield TextField::new('message', 'Aktion');
+        yield TextField::new('requestId', 'Request ID');
+        yield TextField::new('uri', 'URI');
+        yield JsonDataField::new('context', 'Kontext')->onlyOnDetail();
+        yield JsonDataField::new('extra', 'Extra')->onlyOnDetail();
+    }
+
+    public function xmlDumps(Request $request, XmlDumpService $xmlDumpService): Response
+    {
+        $entityId = $request->query->getInt('entityId');
+        if ($entityId <= 0) {
+            throw $this->createNotFoundException('Log entry not found.');
+        }
+
+        $entity = $this->logEntryRepository->find($entityId);
+        if (!$entity instanceof LogEntry) {
+            throw $this->createNotFoundException('Log entry not found.');
+        }
+
+        $dumps = [];
+        try {
+            $dumps = $xmlDumpService->findDumpsForRequestId($entity->getRequestId());
+        } catch (FilesystemException) {
+        }
+
+        return $this->render('admin/xml_dump/list.html.twig', [
+            'logEntry' => $entity,
+            'requestId' => $entity->getRequestId(),
+            'dumps' => $dumps,
+        ]);
     }
 }
diff --git a/src/Entity/LogEntry.php b/src/Entity/LogEntry.php
index 4601eae..adc88aa 100644
--- a/src/Entity/LogEntry.php
+++ b/src/Entity/LogEntry.php
@@ -8,6 +8,7 @@ use App\Repository\LogEntryRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: LogEntryRepository::class)]
+#[ORM\Table(indexes: [new ORM\Index(name: 'IDX_LOG_ENTRY_ERROR_CODE', columns: ['error_code'])])]
 class LogEntry
 {
     #[ORM\Id]
@@ -30,6 +31,9 @@ class LogEntry
     #[ORM\Column(type: 'datetime_immutable')]
     private \DateTimeImmutable $createdAt;
 
+    #[ORM\Column(type: 'string', length: 12, nullable: true)]
+    private ?string $errorCode = null;
+
     public function __construct(string $channel, string $message)
     {
         $this->channel = $channel;
@@ -112,9 +116,16 @@ class LogEntry
         return $this->getExtra()['request_id'] ?? '-';
     }
 
-    public function getErrorCode(): string
+    public function getErrorCode(): ?string
     {
-        return $this->getExtra()['error_code'] ?? '-';
+        return $this->errorCode;
+    }
+
+    public function setErrorCode(?string $errorCode): self
+    {
+        $this->errorCode = $errorCode;
+
+        return $this;
     }
 
     public function getUri(): string
diff --git a/src/Logger/DatabaseHandler.php b/src/Logger/DatabaseHandler.php
index 8e1232d..367b023 100644
--- a/src/Logger/DatabaseHandler.php
+++ b/src/Logger/DatabaseHandler.php
@@ -32,6 +32,7 @@ class DatabaseHandler extends AbstractProcessingHandler
         $logEntry
             ->setContext($record->context)
             ->setExtra($record->extra)
+            ->setErrorCode($record->extra['error_code'] ?? null)
         ;
 
         $this->entityManager->persist($logEntry);
diff --git a/src/Repository/LogEntryRepository.php b/src/Repository/LogEntryRepository.php
index bd80722..a459c3e 100644
--- a/src/Repository/LogEntryRepository.php
+++ b/src/Repository/LogEntryRepository.php
@@ -27,4 +27,13 @@ class LogEntryRepository extends ServiceEntityRepository
             ->getQuery()
             ->execute();
     }
+
+    public function findWithErrorCodes(): array
+    {
+        return $this->createQueryBuilder('l')
+            ->where('l.errorCode IS NOT NULL')
+            ->orderBy('l.createdAt', 'DESC')
+            ->getQuery()
+            ->getResult();
+    }
 }
diff --git a/templates/admin/xml_dump/list.html.twig b/templates/admin/xml_dump/list.html.twig
index 4e4676b..1393a00 100644
--- a/templates/admin/xml_dump/list.html.twig
+++ b/templates/admin/xml_dump/list.html.twig
@@ -23,7 +23,7 @@
                         <tr>
                             <th>Dateiname</th>
                             <th>Typ</th>
-                            <th class="text-end">Dateigr&ouml;&szlig;e</th>
+                            <th class="text-end">Dateigröße</th>
                             <th class="text-end">Aktion</th>
                         </tr>
                     </thead>
@@ -55,7 +55,7 @@
         <div class="content-panel-footer">
             <a href="{{ ea_url().setController('App\\Controller\\Admin\\LogEntryCrudController').setAction('index') }}"
                class="btn btn-secondary">
-                <i class="fa fa-arrow-left"></i> Zur&uuml;ck zur Liste
+                <i class="fa fa-arrow-left"></i> Zurück zur Liste
             </a>
         </div>
     </div>