diff --git a/documents/April2021_Datentabelle baueradvance.com.xlsx b/documents/April2021_Datentabelle baueradvance.com.xlsx
new file mode 100644
index 0000000..84f8d15
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diff --git a/httpdocs/composer.json b/httpdocs/composer.json
index 607e4e7..c722b75 100644
--- a/httpdocs/composer.json
+++ b/httpdocs/composer.json
@@ -16,7 +16,8 @@
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         "terminal42/contao-changelanguage": "^3.1",
         "terminal42/contao-node": "^1.3",
-        "terminal42/dc_multilingual": "^4.1"
+        "terminal42/dc_multilingual": "^4.1",
+        "onurb/excel-bundle": "^1.0"
     },
     "extra": {
         "contao-component-dir": "assets"
diff --git a/httpdocs/composer.lock b/httpdocs/composer.lock
index baea335..c53eea7 100644
--- a/httpdocs/composer.lock
+++ b/httpdocs/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "bb8176e4b84151a2b3e04303c69ddae5",
+    "content-hash": "cecc1016949c9828ae57f7ec14197a87",
     "packages": [
         {
             "name": "alnv/catalog-manager",
@@ -4214,6 +4214,60 @@
             ],
             "time": "2021-04-01T18:37:14+00:00"
         },
+        {
+            "name": "ezyang/htmlpurifier",
+            "version": "v4.13.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ezyang/htmlpurifier.git",
+                "reference": "08e27c97e4c6ed02f37c5b2b20488046c8d90d75"
+            },
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+                "reference": "08e27c97e4c6ed02f37c5b2b20488046c8d90d75",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.2"
+            },
+            "require-dev": {
+                "simpletest/simpletest": "dev-master#72de02a7b80c6bb8864ef9bf66d41d2f58f826bd"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "HTMLPurifier": "library/"
+                },
+                "files": [
+                    "library/HTMLPurifier.composer.php"
+                ],
+                "exclude-from-classmap": [
+                    "/library/HTMLPurifier/Language/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-2.1-or-later"
+            ],
+            "authors": [
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+                    "name": "Edward Z. Yang",
+                    "email": "admin@htmlpurifier.org",
+                    "homepage": "http://ezyang.com"
+                }
+            ],
+            "description": "Standards compliant HTML filter written in PHP",
+            "homepage": "http://htmlpurifier.org/",
+            "keywords": [
+                "html"
+            ],
+            "support": {
+                "issues": "https://github.com/ezyang/htmlpurifier/issues",
+                "source": "https://github.com/ezyang/htmlpurifier/tree/master"
+            },
+            "time": "2020-06-29T00:56:53+00:00"
+        },
         {
             "name": "friendsofsymfony/http-cache",
             "version": "2.10.0",
@@ -5421,6 +5475,246 @@
             ],
             "time": "2021-03-29T14:13:42+00:00"
         },
+        {
+            "name": "maennchen/zipstream-php",
+            "version": "2.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/maennchen/ZipStream-PHP.git",
+                "reference": "c4c5803cc1f93df3d2448478ef79394a5981cc58"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/maennchen/ZipStream-PHP/zipball/c4c5803cc1f93df3d2448478ef79394a5981cc58",
+                "reference": "c4c5803cc1f93df3d2448478ef79394a5981cc58",
+                "shasum": ""
+            },
+            "require": {
+                "myclabs/php-enum": "^1.5",
+                "php": ">= 7.1",
+                "psr/http-message": "^1.0",
+                "symfony/polyfill-mbstring": "^1.0"
+            },
+            "require-dev": {
+                "ext-zip": "*",
+                "guzzlehttp/guzzle": ">= 6.3",
+                "mikey179/vfsstream": "^1.6",
+                "phpunit/phpunit": ">= 7.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "ZipStream\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Paul Duncan",
+                    "email": "pabs@pablotron.org"
+                },
+                {
+                    "name": "Jonatan Männchen",
+                    "email": "jonatan@maennchen.ch"
+                },
+                {
+                    "name": "Jesse Donat",
+                    "email": "donatj@gmail.com"
+                },
+                {
+                    "name": "András Kolesár",
+                    "email": "kolesar@kolesar.hu"
+                }
+            ],
+            "description": "ZipStream is a library for dynamically streaming dynamic zip files from PHP without writing to the disk at all on the server.",
+            "keywords": [
+                "stream",
+                "zip"
+            ],
+            "support": {
+                "issues": "https://github.com/maennchen/ZipStream-PHP/issues",
+                "source": "https://github.com/maennchen/ZipStream-PHP/tree/master"
+            },
+            "funding": [
+                {
+                    "url": "https://opencollective.com/zipstream",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2020-05-30T13:11:16+00:00"
+        },
+        {
+            "name": "markbaker/complex",
+            "version": "2.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/MarkBaker/PHPComplex.git",
+                "reference": "6f724d7e04606fd8adaa4e3bb381c3e9db09c946"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/MarkBaker/PHPComplex/zipball/6f724d7e04606fd8adaa4e3bb381c3e9db09c946",
+                "reference": "6f724d7e04606fd8adaa4e3bb381c3e9db09c946",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "phpcompatibility/php-compatibility": "^9.0",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.3",
+                "squizlabs/php_codesniffer": "^3.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Complex\\": "classes/src/"
+                },
+                "files": [
+                    "classes/src/functions/abs.php",
+                    "classes/src/functions/acos.php",
+                    "classes/src/functions/acosh.php",
+                    "classes/src/functions/acot.php",
+                    "classes/src/functions/acoth.php",
+                    "classes/src/functions/acsc.php",
+                    "classes/src/functions/acsch.php",
+                    "classes/src/functions/argument.php",
+                    "classes/src/functions/asec.php",
+                    "classes/src/functions/asech.php",
+                    "classes/src/functions/asin.php",
+                    "classes/src/functions/asinh.php",
+                    "classes/src/functions/atan.php",
+                    "classes/src/functions/atanh.php",
+                    "classes/src/functions/conjugate.php",
+                    "classes/src/functions/cos.php",
+                    "classes/src/functions/cosh.php",
+                    "classes/src/functions/cot.php",
+                    "classes/src/functions/coth.php",
+                    "classes/src/functions/csc.php",
+                    "classes/src/functions/csch.php",
+                    "classes/src/functions/exp.php",
+                    "classes/src/functions/inverse.php",
+                    "classes/src/functions/ln.php",
+                    "classes/src/functions/log2.php",
+                    "classes/src/functions/log10.php",
+                    "classes/src/functions/negative.php",
+                    "classes/src/functions/pow.php",
+                    "classes/src/functions/rho.php",
+                    "classes/src/functions/sec.php",
+                    "classes/src/functions/sech.php",
+                    "classes/src/functions/sin.php",
+                    "classes/src/functions/sinh.php",
+                    "classes/src/functions/sqrt.php",
+                    "classes/src/functions/tan.php",
+                    "classes/src/functions/tanh.php",
+                    "classes/src/functions/theta.php",
+                    "classes/src/operations/add.php",
+                    "classes/src/operations/subtract.php",
+                    "classes/src/operations/multiply.php",
+                    "classes/src/operations/divideby.php",
+                    "classes/src/operations/divideinto.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mark Baker",
+                    "email": "mark@lange.demon.co.uk"
+                }
+            ],
+            "description": "PHP Class for working with complex numbers",
+            "homepage": "https://github.com/MarkBaker/PHPComplex",
+            "keywords": [
+                "complex",
+                "mathematics"
+            ],
+            "support": {
+                "issues": "https://github.com/MarkBaker/PHPComplex/issues",
+                "source": "https://github.com/MarkBaker/PHPComplex/tree/2.0.3"
+            },
+            "time": "2021-06-02T09:44:11+00:00"
+        },
+        {
+            "name": "markbaker/matrix",
+            "version": "2.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/MarkBaker/PHPMatrix.git",
+                "reference": "174395a901b5ba0925f1d790fa91bab531074b61"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/MarkBaker/PHPMatrix/zipball/174395a901b5ba0925f1d790fa91bab531074b61",
+                "reference": "174395a901b5ba0925f1d790fa91bab531074b61",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "phpcompatibility/php-compatibility": "^9.0",
+                "phpdocumentor/phpdocumentor": "2.*",
+                "phploc/phploc": "^4.0",
+                "phpmd/phpmd": "2.*",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.3",
+                "sebastian/phpcpd": "^4.0",
+                "squizlabs/php_codesniffer": "^3.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Matrix\\": "classes/src/"
+                },
+                "files": [
+                    "classes/src/Functions/adjoint.php",
+                    "classes/src/Functions/antidiagonal.php",
+                    "classes/src/Functions/cofactors.php",
+                    "classes/src/Functions/determinant.php",
+                    "classes/src/Functions/diagonal.php",
+                    "classes/src/Functions/identity.php",
+                    "classes/src/Functions/inverse.php",
+                    "classes/src/Functions/minors.php",
+                    "classes/src/Functions/trace.php",
+                    "classes/src/Functions/transpose.php",
+                    "classes/src/Operations/add.php",
+                    "classes/src/Operations/directsum.php",
+                    "classes/src/Operations/subtract.php",
+                    "classes/src/Operations/multiply.php",
+                    "classes/src/Operations/divideby.php",
+                    "classes/src/Operations/divideinto.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mark Baker",
+                    "email": "mark@demon-angel.eu"
+                }
+            ],
+            "description": "PHP Class for working with matrices",
+            "homepage": "https://github.com/MarkBaker/PHPMatrix",
+            "keywords": [
+                "mathematics",
+                "matrix",
+                "vector"
+            ],
+            "support": {
+                "issues": "https://github.com/MarkBaker/PHPMatrix/issues",
+                "source": "https://github.com/MarkBaker/PHPMatrix/tree/2.1.3"
+            },
+            "time": "2021-05-25T15:42:17+00:00"
+        },
         {
             "name": "matthiasmullie/minify",
             "version": "1.3.66",
@@ -5751,6 +6045,66 @@
             ],
             "time": "2020-12-14T12:56:38+00:00"
         },
+        {
+            "name": "myclabs/php-enum",
+            "version": "1.8.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/php-enum.git",
+                "reference": "b942d263c641ddb5190929ff840c68f78713e937"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/php-enum/zipball/b942d263c641ddb5190929ff840c68f78713e937",
+                "reference": "b942d263c641ddb5190929ff840c68f78713e937",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": "^7.3 || ^8.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5",
+                "squizlabs/php_codesniffer": "1.*",
+                "vimeo/psalm": "^4.6.2"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "MyCLabs\\Enum\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP Enum contributors",
+                    "homepage": "https://github.com/myclabs/php-enum/graphs/contributors"
+                }
+            ],
+            "description": "PHP Enum implementation",
+            "homepage": "http://github.com/myclabs/php-enum",
+            "keywords": [
+                "enum"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/php-enum/issues",
+                "source": "https://github.com/myclabs/php-enum/tree/1.8.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/mnapoli",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/php-enum",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-07-05T08:18:36+00:00"
+        },
         {
             "name": "nelmio/cors-bundle",
             "version": "2.1.0",
@@ -6209,6 +6563,79 @@
             ],
             "time": "2020-07-13T19:23:57+00:00"
         },
+        {
+            "name": "onurb/excel-bundle",
+            "version": "1.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Nono1971/excel-bundle.git",
+                "reference": "ebd4e5ebfd683d54d0b94834e514619128434f41"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Nono1971/excel-bundle/zipball/ebd4e5ebfd683d54d0b94834e514619128434f41",
+                "reference": "ebd4e5ebfd683d54d0b94834e514619128434f41",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.3",
+                "phpoffice/phpspreadsheet": "~1.0",
+                "symfony/config": "~4.2",
+                "symfony/dependency-injection": "~3.2|~4.0",
+                "symfony/framework-bundle": "~3.2|~4.0",
+                "symfony/http-foundation": "~3.2|~4.0",
+                "symfony/http-kernel": "~3.2|~4.0"
+            },
+            "require-dev": {
+                "php": ">=7.0",
+                "phpunit/phpunit": "~6.5",
+                "sensio/framework-extra-bundle": "~3.2|~4.0",
+                "squizlabs/php_codesniffer": "~2"
+            },
+            "suggest": {
+                "onurb/doctrine-yuml-bundle": "Use this bundle to generate mapping graph from your entities"
+            },
+            "type": "symfony-bundle",
+            "extra": {
+                "symfony": {
+                    "allow-contrib": "true"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Onurb\\Bundle\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Giulio De Donato",
+                    "email": "liuggio@gmail.com"
+                },
+                {
+                    "name": "Bruno Heron",
+                    "email": "herobrun@gmail.com"
+                }
+            ],
+            "description": "Symfony Bundle to read or write Excel file (including pdf, xlsx, odt), using phpoffice/phpspreadsheet library (replacement of phpoffice/phpexcel, abandonned)",
+            "keywords": [
+                "PHPExcel",
+                "bundle",
+                "excel",
+                "spreadsheet",
+                "symfony",
+                "xls",
+                "xlsx"
+            ],
+            "support": {
+                "issues": "https://github.com/Nono1971/excel-bundle/issues",
+                "source": "https://github.com/Nono1971/excel-bundle/tree/1.0.2"
+            },
+            "time": "2019-06-24T20:41:00+00:00"
+        },
         {
             "name": "oveleon/contao-component-style-manager",
             "version": "2.4.4",
@@ -6818,6 +7245,110 @@
             ],
             "time": "2020-07-07T09:29:14+00:00"
         },
+        {
+            "name": "phpoffice/phpspreadsheet",
+            "version": "1.18.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
+                "reference": "418cd304e8e6b417ea79c3b29126a25dc4b1170c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/418cd304e8e6b417ea79c3b29126a25dc4b1170c",
+                "reference": "418cd304e8e6b417ea79c3b29126a25dc4b1170c",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-dom": "*",
+                "ext-fileinfo": "*",
+                "ext-gd": "*",
+                "ext-iconv": "*",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-simplexml": "*",
+                "ext-xml": "*",
+                "ext-xmlreader": "*",
+                "ext-xmlwriter": "*",
+                "ext-zip": "*",
+                "ext-zlib": "*",
+                "ezyang/htmlpurifier": "^4.13",
+                "maennchen/zipstream-php": "^2.1",
+                "markbaker/complex": "^2.0",
+                "markbaker/matrix": "^2.0",
+                "php": "^7.2 || ^8.0",
+                "psr/http-client": "^1.0",
+                "psr/http-factory": "^1.0",
+                "psr/simple-cache": "^1.0"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "dev-master",
+                "dompdf/dompdf": "^1.0",
+                "friendsofphp/php-cs-fixer": "^2.18",
+                "jpgraph/jpgraph": "^4.0",
+                "mpdf/mpdf": "^8.0",
+                "phpcompatibility/php-compatibility": "^9.3",
+                "phpstan/phpstan": "^0.12.82",
+                "phpstan/phpstan-phpunit": "^0.12.18",
+                "phpunit/phpunit": "^8.5",
+                "squizlabs/php_codesniffer": "^3.5",
+                "tecnickcom/tcpdf": "^6.3"
+            },
+            "suggest": {
+                "dompdf/dompdf": "Option for rendering PDF with PDF Writer (doesn't yet support PHP8)",
+                "jpgraph/jpgraph": "Option for rendering charts, or including charts with PDF or HTML Writers",
+                "mpdf/mpdf": "Option for rendering PDF with PDF Writer",
+                "tecnickcom/tcpdf": "Option for rendering PDF with PDF Writer (doesn't yet support PHP8)"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "PhpOffice\\PhpSpreadsheet\\": "src/PhpSpreadsheet"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Maarten Balliauw",
+                    "homepage": "https://blog.maartenballiauw.be"
+                },
+                {
+                    "name": "Mark Baker",
+                    "homepage": "https://markbakeruk.net"
+                },
+                {
+                    "name": "Franck Lefevre",
+                    "homepage": "https://rootslabs.net"
+                },
+                {
+                    "name": "Erik Tilt"
+                },
+                {
+                    "name": "Adrien Crivelli"
+                }
+            ],
+            "description": "PHPSpreadsheet - Read, Create and Write Spreadsheet documents in PHP - Spreadsheet engine",
+            "homepage": "https://github.com/PHPOffice/PhpSpreadsheet",
+            "keywords": [
+                "OpenXML",
+                "excel",
+                "gnumeric",
+                "ods",
+                "php",
+                "spreadsheet",
+                "xls",
+                "xlsx"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/1.18.0"
+            },
+            "time": "2021-05-31T18:21:15+00:00"
+        },
         {
             "name": "phpspec/php-diff",
             "version": "v1.1.3",
@@ -12728,5 +13259,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }
diff --git a/httpdocs/config/routing.yaml b/httpdocs/config/routing.yaml
new file mode 100644
index 0000000..90f06d4
--- /dev/null
+++ b/httpdocs/config/routing.yaml
@@ -0,0 +1,7 @@
+# config/routing.yml
+app.controller:
+  resource: ../src/Controller
+  type: annotation
+
+#ContaoCoreBundle:
+#  resource: "@ContaoCoreBundle/Resources/config/routing.yml"
\ No newline at end of file
diff --git a/httpdocs/config/services.yaml b/httpdocs/config/services.yaml
new file mode 100644
index 0000000..3a2c079
--- /dev/null
+++ b/httpdocs/config/services.yaml
@@ -0,0 +1,46 @@
+# This file is the entry point to configure your own services.
+# Files in the packages/ subdirectory configure your dependencies.
+
+# Put parameters here that don't need to change on each machine where the app is deployed
+# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
+parameters:
+
+
+services:
+    # default configuration for services in *this* file
+    _defaults:
+        autowire: true      # Automatically injects dependencies in your services.
+        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
+
+    # makes classes in src/ available to be used as services
+    # this creates a service per class whose id is the fully-qualified class name
+    App\:
+        resource: '../src/'
+        exclude:
+            - '../src/DependencyInjection/'
+            - '../src/Entity/'
+            - '../src/Kernel.php'
+            - '../src/Tests/'
+
+    # controllers are imported separately to make sure services can be injected
+    # as action arguments even if you don't extend any base controller class
+    App\Controller\:
+        resource: '../src/Controller/'
+        tags: ['controller.service_arguments', '%kernel.environment%']
+
+    App\Command\:
+      resource: '../src/Command/'
+      autowire: true
+      autoconfigure: true
+      arguments: ['@doctrine.orm.entity_manager', '@service_container']
+      tags:
+        - { name: 'console.command' }
+
+    # add more service definitions when explicit configuration is needed
+    # please note that last definitions always *replace* previous ones
+    App\EventListener\BackendMenuListener:
+      arguments:
+        - "@router"
+        - "@request_stack"
+      tags:
+        - { name: kernel.event_listener, event: contao.backend_menu_build, method: onContaoBackendMenuBuild, priority: -255 }
\ No newline at end of file
diff --git a/httpdocs/src/Controller/BackendController.php b/httpdocs/src/Controller/BackendController.php
new file mode 100644
index 0000000..72b09b6
--- /dev/null
+++ b/httpdocs/src/Controller/BackendController.php
@@ -0,0 +1,164 @@
+<?php
+namespace App\Controller;
+
+
+use Doctrine\DBAL\Connection;
+use Onurb\Bundle\ExcelBundle\Factory\ExcelFactory;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\KernelInterface;
+use Symfony\Component\Routing\Annotation\Route;
+use Twig\Environment as TwigEnvironment;
+use Terminal42\ServiceAnnotationBundle\Annotation\ServiceTag;
+use function Ramsey\Uuid\v1;
+
+/**
+ * @Route("/contao/key-data",
+ *     defaults={
+ *          "_scope" = "backend",
+ *          "_backend_module" = "my-module",
+ *          "_token_check" = true
+ *     }
+ * )
+ * @ServiceTag("controller.service_arguments")
+ */
+class BackendController extends AbstractController
+{
+
+    private $twig;
+    private $kernel;
+
+    public function __construct(TwigEnvironment $twig, KernelInterface $kernel)
+    {
+        $GLOBALS['TL_JAVASCRIPT'][] = 'assets/jquery/js/jquery.js';
+        $this->twig = $twig;
+        $this->kernel = $kernel;
+    }
+
+    /**
+     * @Route("/", name="data_menu")
+     *
+     * @param Request $request
+     * @return Response
+     * @throws \Twig\Error\LoaderError
+     * @throws \Twig\Error\RuntimeError
+     * @throws \Twig\Error\SyntaxError
+     */
+    public function dataMenu(Request $request): Response
+    {
+        $res = $this->twig->render(
+            'backend/data_menu.html.twig',
+            [
+                'token' => $this->getToken($request)
+            ]
+        );
+        return new Response($res);
+    }
+
+    /**
+     * @Route("/import-xls", name="import_xls")
+     *
+     * @param Request $request
+     * @return JsonResponse
+     */
+    public function importXls(Request $request)
+    {
+        /** @var UploadedFile $xlsFile */
+        $xlsFile = $request->files->get('xls');
+
+
+        if ($xlsFile === null ||
+            !($xlsFile->getClientMimeType() === 'application/vnd.ms-excel' ||
+              $xlsFile->getClientMimeType() === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' ||
+              $xlsFile->getClientMimeType() === 'application/octet-stream')) {
+            return new JsonResponse(null, JsonResponse::HTTP_BAD_REQUEST);
+        }
+
+
+        // Save file temporarily
+        $filename = time().'.xls';
+        $path = __DIR__.'/../../xls-imports/';
+
+        if (!file_exists($path)) {
+            mkdir($path, 0777, true);
+        }
+
+        $xlsFile->move(
+            $path,
+            $filename
+        );
+
+        $excelFactory = new ExcelFactory();
+        $spreadsheet = $excelFactory->createSpreadsheet($path . $filename);
+        $spreadsheet->setActiveSheetIndex(0);
+        $activesheet = $spreadsheet->getActiveSheet();
+        $highestRow = $activesheet->getHighestRow();
+        $startRow = 5;
+        /** @var Connection $connection */
+        $connection = $this->getDoctrine()->getConnection();
+
+        $resultSet = $connection->executeQuery('SELECT * FROM `ctlg_brands`');
+        $data = $resultSet->fetchAllAssociative();
+        $entriesById = [];
+        foreach ($data as $entry) {
+            $entriesById[$entry['id']] = $entry;
+        }
+
+        $connection->beginTransaction();
+        try {
+
+            for ($row = $startRow; $row <= $highestRow; $row++) {
+                $id = $activesheet->getCell('A'.$row)->getValue();
+                if ($id !== null) {
+
+                    if (!array_key_exists($id, $entriesById)) {
+                        return new JsonResponse("id $id existiert nicht im System", JsonResponse::HTTP_BAD_REQUEST);
+                    }
+                    $range = (int)$activesheet->getCell('E'.$row)->getCalculatedValue();
+                    $edition = (int)$activesheet->getCell('G'.$row)->getCalculatedValue();
+                    $brand_reach = (int)$activesheet->getCell('K'.$row)->getCalculatedValue();
+                    $social_contacts = (int)$activesheet->getCell('M'.$row)->getCalculatedValue();
+                    $unique_users = (int)$activesheet->getCell('N'.$row)->getCalculatedValue();
+                    $page_impressions = (int)$activesheet->getCell('P'.$row)->getCalculatedValue();
+                    $visits = (int)$activesheet->getCell('R'.$row)->getCalculatedValue();
+
+                    $range = $range !== 0 ? $range : "";
+                    $edition = $edition !== 0 ? $edition : "";
+                    $brand_reach = $brand_reach !== 0 ? $brand_reach : "";
+                    $social_contacts = $social_contacts !== 0 ? $social_contacts : "";
+                    $unique_users = $unique_users !== 0 ? $unique_users : "";
+                    $page_impressions = $page_impressions !== 0 ? $page_impressions : "";
+                    $visits = $visits !== 0 ? $visits : "";
+
+                    $connection->executeStatement(
+                        "UPDATE `ctlg_brands` SET ".
+                            "`range`='$range',".
+                            "`edition`='$edition',".
+                            "`brand_reach`='$brand_reach',".
+                            "`social_contacts`='$social_contacts',".
+                            "`unique_user`='$unique_users',".
+                            "`page_impressions`='$page_impressions',".
+                            "`visits`='$visits'".
+                            " WHERE `id` = $id"
+                    );
+                }
+            }
+
+        } catch (\Exception $e) {
+            $connection->rollBack();
+            unlink($path . $filename);
+            return new JsonResponse("Es ist ein Fehler aufgetreten: ".$e->getMessage(), JsonResponse::HTTP_BAD_REQUEST);
+        }
+        $connection->commit();
+        unlink($path . $filename);
+        return new JsonResponse('done');
+    }
+
+    private function getToken(Request $request)
+    {
+        return $request->cookies->get($this->kernel->getEnvironment() === 'dev' ? 'csrf_contao_csrf_token' : 'csrf_https-contao_csrf_token');
+    }
+}
\ No newline at end of file
diff --git a/httpdocs/src/EventListener/BackendMenuListener.php b/httpdocs/src/EventListener/BackendMenuListener.php
new file mode 100644
index 0000000..3adb5a5
--- /dev/null
+++ b/httpdocs/src/EventListener/BackendMenuListener.php
@@ -0,0 +1,50 @@
+<?php
+
+
+namespace App\EventListener;
+
+use App\Controller\BackendController;
+use Contao\CoreBundle\Event\MenuEvent;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\Routing\RouterInterface;
+use Terminal42\ServiceAnnotationBundle\Annotation\ServiceTag;
+
+/**
+ * Class to register backend modules
+ *
+ * @ServiceTag("kernel.event_listener", event="contao.backend_menu_build", priority=-255)
+ */
+class BackendMenuListener
+{
+    protected $router;
+    protected $requestStack;
+
+    public function __construct(RouterInterface $router, RequestStack $requestStack)
+    {
+        $this->router = $router;
+        $this->requestStack = $requestStack;
+    }
+
+    public function onContaoBackendMenuBuild(MenuEvent $event): void
+    {
+        $factory = $event->getFactory();
+        $tree = $event->getTree();
+
+        if ('mainMenu' !== $tree->getName()) {
+            return;
+        }
+
+        $contentNode = $tree->getChild('content');
+
+        $node = $factory
+            ->createItem('Brands Data Import')
+            ->setUri($this->router->generate('data_menu'))
+            ->setLabel('Brands Data Import')
+            ->setLinkAttribute('title', 'Brands Data Import')
+            ->setLinkAttribute('class', 'brands-import-data')
+            ->setCurrent($this->requestStack->getCurrentRequest()->get('_controller') === BackendController::class)
+        ;
+
+        $contentNode->addChild($node);
+    }
+}
diff --git a/httpdocs/templates/backend/data_menu.html.twig b/httpdocs/templates/backend/data_menu.html.twig
new file mode 100644
index 0000000..9e5c501
--- /dev/null
+++ b/httpdocs/templates/backend/data_menu.html.twig
@@ -0,0 +1,65 @@
+{% extends "@ContaoCore/Backend/be_page.html.twig" %}
+
+{% block headline %}
+    Datenverwaltung
+{% endblock %}
+
+{% block error %}
+{% endblock %}
+
+{% block main %}
+    <script>
+        jQuery.noConflict();
+    </script>
+
+    <div class="tl_listing_container list_view">
+        <div id="xls-message"></div>
+        <form id="xls-import" method="post" action="{{ path('import_xls') }}" enctype="multipart/form-data">
+            <input type="hidden" name="REQUEST_TOKEN" value="{{ token }}"/>
+            <table class="tl_listing">
+                <tbody>
+                <tr>
+                    <td colspan="4" class="tl_folder_tlist">Excel Import</td>
+                </tr>
+                <tr>
+                    <td class="tl_file_list">
+                        <label for="result-xls">Excel-Datei:</label>
+                    </td>
+                    <td class="tl_file_list">
+                        <input id="xls" type="file" name="xls" accept=".xls,.xlsx,.XLS,.XLSX" class="tl_submit" required>
+                    </td>
+                    <td class="tl_file_list" colspan="2">
+                        <input type="submit" value="Datei importieren" class="tl_submit">
+                    </td>
+                </tr>
+                </tbody>
+            </table>
+        </form>
+    </div>
+
+    <script src="{{ asset('files/e-formel/assets/backend/js/backend-data-menu.js') }}" type="text/javascript" charset="utf-8"></script>
+    <script>
+        jQuery("#xls-import").on("submit", function(e) {
+            e.preventDefault();
+            let form = jQuery(this)[0]; // You need to use standard javascript object here
+            let formData = new FormData(form);
+            jQuery("#xls-message").html("");
+            jQuery.ajax({
+                url: "{{ path('import_xls') }}",
+                method: "post",
+                data: formData,
+                processData: false,
+                contentType: false,
+                success: function(data) {
+                    jQuery("#xls-message").html("Excel-Datei wurde erfolgreich importiert!");
+                },
+                error: function(requestObject, error, errorThrown) {
+                    jQuery("#xls-message").html('Fehler:' + requestObject.responseText);
+                },
+                dataType: "html"
+            });
+        });
+
+    </script>
+
+{% endblock %}