diff --git a/Docs/backend_API_docs/README.md b/Docs/backend_API_docs/README.md
index a18ebb2..e993c89 100644
--- a/Docs/backend_API_docs/README.md
+++ b/Docs/backend_API_docs/README.md
@@ -31,10 +31,10 @@ Include an API key in the route as `:key` parameter:
 Example:
 
 ```http
-GET /api/items/ABC123
+GET /api/items/12345678
 ```
 
-Where `ABC123` is your API key.  
+Where `12345678` is your API key.  
 The API key is validated server-side.
 
 ---
@@ -59,7 +59,7 @@ Returns a list of all items.
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 
 #### Authentication
 
@@ -70,14 +70,7 @@ Returns a list of all items.
 #### Request Example
 
 ```http
-GET /api/items/ABC123 HTTP/1.1
-Host: backend.insta.the1s.de
-```
-
-or
-
-```http
-GET /api/items/dummyKey HTTP/1.1
+GET /api/items/12345678 HTTP/1.1
 Host: backend.insta.the1s.de
 Authorization: Bearer <JWT_TOKEN>
 ```
@@ -123,7 +116,7 @@ Toggles `in_safe` between `0` and `1` for a given item.
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 - `:itemId` – Item ID (integer)
 
 #### Authentication
@@ -133,7 +126,7 @@ Toggles `in_safe` between `0` and `1` for a given item.
 #### Request Example
 
 ```http
-POST /api/change-state/ABC123/42 HTTP/1.1
+POST /api/change-state/12345678/42 HTTP/1.1
 Host: backend.insta.the1s.de
 ```
 
@@ -165,7 +158,7 @@ Fetch loan information by `loan_code`.
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 - `:loan_code` – Loan code (string)
 
 #### Authentication
@@ -175,7 +168,7 @@ Fetch loan information by `loan_code`.
 #### Request Example
 
 ```http
-GET /api/get-loan-by-code/ABC123/12345 HTTP/1.1
+GET /api/get-loan-by-code/12345678/12345 HTTP/1.1
 Host: backend.insta.the1s.de
 ```
 
@@ -214,7 +207,7 @@ Sets `returned_date = NOW()` on a loan and updates related items:
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 - `:loan_code` – Loan code (string)
 
 #### Authentication
@@ -224,7 +217,7 @@ Sets `returned_date = NOW()` on a loan and updates related items:
 #### Request Example
 
 ```http
-POST /api/set-return-date/ABC123/12345 HTTP/1.1
+POST /api/set-return-date/12345678/12345 HTTP/1.1
 Host: backend.insta.the1s.de
 ```
 
@@ -257,7 +250,7 @@ Sets `take_date = NOW()` on a loan and updates related items:
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 - `:loan_code` – Loan code (string)
 
 #### Authentication
@@ -267,7 +260,7 @@ Sets `take_date = NOW()` on a loan and updates related items:
 #### Request Example
 
 ```http
-POST /api/set-take-date/ABC123/LOAN-12345 HTTP/1.1
+POST /api/set-take-date/12345678/LOAN-12345 HTTP/1.1
 Host: backend.insta.the1s.de
 ```
 
@@ -297,7 +290,7 @@ Looks up an item by its `door_key`, toggles `in_safe`, and returns safe informat
 
 #### Path Parameters
 
-- `:key` – API key (string)
+- `:key` – API key (8-digit number)
 - `:doorKey` – Door key/token (string) used by hardware to identify the locker.
 
 #### Authentication
@@ -307,7 +300,7 @@ Looks up an item by its `door_key`, toggles `in_safe`, and returns safe informat
 #### Request Example
 
 ```http
-GET /api/open-door/ABC123/123 HTTP/1.1
+GET /api/open-door/12345678/123 HTTP/1.1
 Host: backend.insta.the1s.de
 ```
 
diff --git a/FrontendV2/src/App.tsx b/FrontendV2/src/App.tsx
index 05c206c..5c774c9 100644
--- a/FrontendV2/src/App.tsx
+++ b/FrontendV2/src/App.tsx
@@ -16,6 +16,7 @@ import { Box, Flex } from "@chakra-ui/react";
 import { Footer } from "./components/footer/Footer";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { API_BASE } from "@/config/api.config";
+import { NotFoundPage } from "./pages/NotFoundPage";
 
 const queryClient = new QueryClient();
 
@@ -83,6 +84,7 @@ function App() {
                 </Route>
 
                 <Route path="/login" element={<LoginPage />} />
+                <Route path="/not-found" element={<NotFoundPage />} />
               </Routes>
             </BrowserRouter>
           </UserContext.Provider>
diff --git a/FrontendV2/src/pages/NotFoundPage.tsx b/FrontendV2/src/pages/NotFoundPage.tsx
new file mode 100644
index 0000000..b3c36f6
--- /dev/null
+++ b/FrontendV2/src/pages/NotFoundPage.tsx
@@ -0,0 +1,9 @@
+import React from "react";
+
+export const NotFoundPage = () => {
+  return (
+    <>
+    
+    </>
+  )
+};
diff --git a/admin/src/components/ItemTable.tsx b/admin/src/components/ItemTable.tsx
index ccadef0..fbb3d75 100644
--- a/admin/src/components/ItemTable.tsx
+++ b/admin/src/components/ItemTable.tsx
@@ -193,7 +193,12 @@ const ItemTable: React.FC = () => {
 
       {/* make table fill available width, like UserTable */}
       {!isLoading && (
-        <Table.Root size="sm" striped w="100%" style={{ tableLayout: "auto" }}>
+        <Table.Root
+          size="sm"
+          striped
+          w="100%"
+          style={{ tableLayout: "auto" }} // Spalten nach Content
+        >
           <Table.Header>
             <Table.Row>
               <Table.ColumnHeader>
@@ -208,10 +213,10 @@ const ItemTable: React.FC = () => {
               <Table.ColumnHeader>
                 <strong>Im Schließfach</strong>
               </Table.ColumnHeader>
-              <Table.ColumnHeader>
+              <Table.ColumnHeader width="1%" whiteSpace="nowrap">
                 <strong>Schließfachnummer</strong>
               </Table.ColumnHeader>
-              <Table.ColumnHeader>
+              <Table.ColumnHeader width="1%" whiteSpace="nowrap">
                 <strong>Schlüssel</strong>
               </Table.ColumnHeader>
               <Table.ColumnHeader>
@@ -226,7 +231,7 @@ const ItemTable: React.FC = () => {
               <Table.ColumnHeader>
                 <strong>Dav **</strong>
               </Table.ColumnHeader>
-              <Table.ColumnHeader>
+              <Table.ColumnHeader width="1%" whiteSpace="nowrap">
                 <strong>Aktionen</strong>
               </Table.ColumnHeader>
             </Table.Row>
@@ -314,7 +319,7 @@ const ItemTable: React.FC = () => {
                 <Table.Cell>{formatDateTime(item.entry_updated_at)}</Table.Cell>
                 <Table.Cell>{item.last_borrowed_person}</Table.Cell>
                 <Table.Cell>{item.currently_borrowing}</Table.Cell>
-                <Table.Cell>
+                <Table.Cell whiteSpace="nowrap">
                   <Button
                     onClick={() =>
                       handleEditItems(