Bugfixes

The CSG logo shrinks when on mobile screens

.dockerignore

@@ -0,0 +1,13 @@
+target/
+backend/target/
+frontend/target/
+frontend/dist/
+frontend/node_modules/
+dist/
+.git/
+.idea/
+.env
+.antigravitycli/
+*.pdb
+**/*.rs.bk
+info ding video.mp4

.gitignore

@@ -3,9 +3,12 @@
 # will have compiled files and executables
 debug/
 target/
-data/
 backend/debug/
 backend/target/
+frontend/debug/
+frontend/target/
+frontend/dist/
+frontend/node_modules/
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
@@ -17,9 +20,13 @@ backend/target/
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+.idea/
 
 
 # Added by cargo
 
 /target
+.antigravitycli/
+.sqlx/
+backend/.sqlx/
+dist/

Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "ticketsystem"
+version = "0.1.0"
+edition = "2021"
+readme = "README.md"
+description = "A ticket system with backend and frontend components"
+publish = false
+
+[workspace]
+members = ["backend", "frontend"]
+resolver = "2"
+
+[workspace.dependencies]
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.149"
+chrono = { version = "0.4.44", features = ["serde"] }

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Silas Raffauf
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.cargo.md

@@ -0,0 +1,63 @@
+# Ticketsystem
+
+A ticket system with backend and frontend components.
+
+## Components
+
+- **[Backend](../backend/index.html)** - The server-side API and business logic
+- **[Frontend](../frontend/index.html)** - The client-side user interface
+
+## Usage
+### Prerequisite
+#### IMPORTANT
+Before compiling the programm you have to install the rust toolchain. 
+For a guide to do this, visit: <https://rust-lang.org/tools/install/>
+
+A instance of a postgresql has to be accessible to the backend. Place the connection details in a .env file into the variable `DATABASE_URL`
+To setup the tables you either can create them manually by following the sheme specified in `backend/migrations` or apply them with sqlx
+To install sqlx run `cargo install sqlx` and then in the `backend` directory run `sqlx migrate run` to create the tables
+
+### Environment
+The .env file has to be in the root directory of the project or in the same directory as the executable
+
+Keys:
+`DATABASE_URL`: Specifying the url and connection details for the database
+`TOKEN_SECRET`: The JWT token secret, can theoretically be anything but is more secure when generated with a tool, e.g: <https://jwtsecrets.com/>
+`ORIGIN`: The origin of the frontend, used for CORS rules
+`BACKEND_PORT`: The port which the backend should use to run on
+
+### Backend
+The backend can either be run via `cargo run --release` or `cargo build --release` using the correct target architecture, e.g. 'x86_64-unknown-linux-gnu', 
+the executable will be placed in the `target/release` directory and can then be run via any method
+
+### Frontend
+The HTML code for the frontend can be generated by using `trunk build`. The resulting files will end up in the `frontend/dist` directory and can be served over any webserver supporting wasm
+#### NOTE
+To install trunk run `cargo install trunk`
+
+#### IMPORTANT
+Requests from the frontend to /api/* have to be proxied to the Backend
+Example with nginx and frontend running at localhost:8000 and backend at localhost:9000 :
+```nginx
+location /api/ {
+  proxy_pass http://localhost:9000/api;
+}
+```
+
+
+## Usage of AI
+
+Github Copilot CLI was used with the model Claude Haiku 4.5 to generate most of the documentation
+
+Google Antigravity generated the Sequence Diagrams
+
+### Prompt 
+Generate comments for cargo doc describing the indivilual components and create links to relevant structs, functions etc.
+
+Generate a sequence diagramm in @[README.md] behind the class diagramms
+
+### Output
+The comments with `///` or `//!`
+I've gone over it and modified it to my needs and opinions
+
+The general structure sequence diagrams above. I've modified and fixed any errors and discrepancys 

README.md

@@ -1,2 +1,392 @@
 # Ticketsystem
 
+A ticket system with backend and frontend components.
+
+## Components
+
+- **[Backend]** - The server-side API and business logic
+- **[Frontend]** - The client-side user interface
+
+## Usage
+### Prerequisite
+> [!IMPORTANT]
+> Before compiling the programm you have to install the rust toolchain. 
+> For a guide to do this, visit: <https://rust-lang.org/tools/install/>
+
+A instance of a postgresql has to be accessible to the backend. Place the connection details in a .env file into the variable `DATABASE_URL`
+To setup the tables you either can create them manually by following the sheme specified in `backend/migrations` or apply them with sqlx
+To install sqlx run `cargo install sqlx` and then in the `backend` directory run `sqlx migrate run` to create the tables
+
+### Environment
+The .env file has to be in the root directory of the project or in the same directory as the executable
+
+Keys:
+`DATABASE_URL`: Specifying the url and connection details for the database
+`TOKEN_SECRET`: The JWT token secret, can theoretically be anything but is more secure when generated with a tool, e.g: <https://jwtsecrets.com/>
+`ORIGIN`: The origin of the frontend, used for CORS rules
+`BACKEND_PORT`: The port which the backend should use to run on
+
+### Backend
+The backend can either be run via `cargo run --release` or `cargo build --release` using the correct target architecture, e.g. 'x86_64-unknown-linux-gnu', 
+the executable will be placed in the `target/release` directory and can then be run via any method
+
+Alternatively download the executable from the 'Releases' Page for your device
+
+### Frontend
+The HTML code for the frontend can be generated by using `trunk build`. The resulting files will end up in the `frontend/dist` directory and can be served over any webserver supporting WASM
+
+Alternatively download the fontend files from the 'Releases' Page and serve them via any webserver supporting WASM
+> [!NOTE]
+> To install trunk run `cargo install trunk`
+
+> [!IMPORTANT]
+> Requests from the frontend to /api/* have to be proxied to the Backend
+> Example with nginx and frontend running at localhost:8000 and backend at localhost:9000 :
+> ```nginx
+> location /api/ {
+>   proxy_pass http://localhost:9000/api;
+> }
+> ```
+
+### Example
+[![Watch the video]()](https://git.raffauf-clan.de/schn33fuchs/ticketsystem/raw/branch/main/info%20ding%20video.mp4)
+
+## Diagrams
+### Class Diagramm
+#### Backend
+```mermaid
+classDiagram
+    class Error {
+        +status: &'static str
+        +message: String
+    }
+    class TicketResponse {
+        +id: i32
+        +category: String
+        +betreff: String
+        +description: String
+        +room: i16
+        +status: String
+        +date: chrono::DateTime~chrono::Utc~
+        +user_id: i16
+        +user_first_name: String
+        +user_last_name: String
+    }
+    class User {
+        +id: i16
+        +last_name: String
+        +first_name: String
+        +username: String
+        +is_admin: bool
+        +pwd: String
+    }
+    class TicketCreateScheme {
+        +category: String
+        +betreff: String
+        +description: String
+        +room: i16
+    }
+    class TicketUpdateScheme {
+        +status: String
+    }
+    class UserUpdateScheme {
+        +id: i16
+        +first_name: String
+        +last_name: String
+        +username: String
+        +make_admin: bool
+        +new_pwd: String
+    }
+    class UserCreateScheme {
+        +first_name: String
+        +last_name: String
+        +username: String
+        +is_admin: bool
+        +pwd: String
+    }
+    class LoginScheme {
+        +username: String
+        +pwd: String
+    }
+    class FilteredUser {
+        +id: i16
+        +first_name: String
+        +last_name: String
+        +username: String
+        +is_admin: bool
+    }
+    class Claims {
+        +sub: String
+        +issued: usize
+        +expires: usize
+    }
+    class AppState {
+        -db: PgPool
+        -env: Env
+    }
+    class Env {
+        +db_url: String
+        +token_secret: String
+        +origin: String
+        +backend_port: String
+        +load() Env
+    }
+    AppState --> Env
+    Env ..> Env
+```
+
+#### Frontend
+```mermaid
+classDiagram
+    class TicketCreateScheme {
+        +category: String
+        +betreff: String
+        +description: String
+        +room: i16
+    }
+    class TicketUpdateScheme {
+        +status: String
+    }
+    class Ticket {
+        +id: i32
+        +category: String
+        +betreff: String
+        +description: String
+        +room: i16
+        +status: String
+        +date: chrono::DateTime~chrono::Utc~
+        +user_id: i16
+        +user_first_name: String
+        +user_last_name: String
+    }
+    class TicketProps {
+        +id: i32
+    }
+    class ActiveUser {
+        +id: Option~i16~
+        +is_admin: bool
+    }
+    class ApiError {
+        -message: String
+        -_status: String
+    }
+    class SidebarExpandState {
+        +ticket_open: bool
+        +users_open: bool
+    }
+    class Default {
+        +default() Self
+    }
+    class SidebarState {
+        +expand: SidebarExpandState
+        +set_tickets_open: Callback~bool~
+        +toggle_tickets: Callback~()~
+        +set_users_open: Callback~bool~
+        +toggle_users: Callback~()~
+        +new(expand:SidebarExpandState, set_tickets_open:Callback~bool~, toggle_tickets:Callback~()~, set_users_open:Callback~bool~, toggle_users:Callback~()~) Self
+    }
+    class SidebarProps {
+        +children: Children
+    }
+    class TicketPartial {
+        -date: DateTime~Utc~
+        -room: i16
+        -user_id: i16
+    }
+    class UserPartial {
+        -id: i16
+        -first_name: String
+        -last_name: String
+    }
+    class RoomTotalsProps {
+        -tickets: Vec~TicketPartial~
+    }
+    class UserTotalProps {
+        -users: Vec~UserPartial~
+        -tickets: Vec~TicketPartial~
+    }
+    class AdminSetupScheme {
+        +first_name: String
+        +last_name: String
+        +username: String
+        +pwd: String
+    }
+    class UserCreateScheme {
+        +first_name: String
+        +last_name: String
+        +username: String
+        +is_admin: bool
+        +pwd: String
+    }
+    class LoginScheme {
+        +username: String
+        +pwd: String
+    }
+    class UserUpdateScheme {
+        +id: i16
+        +first_name: String
+        +last_name: String
+        +username: String
+        +make_admin: bool
+        +new_pwd: String
+    }
+    class FilteredUser {
+        +id: i16
+        +first_name: String
+        +last_name: String
+        +username: String
+        +is_admin: bool
+    }
+    class UserProps {
+        +id: i16
+    }
+    class ApiError {
+        -message: String
+        -_status: String
+    }
+    class AuthState {
+        +is_authenticated: Option~bool~
+        +is_admin: Option~bool~
+    }
+    class ProtectedRouteProps {
+        +children: Children
+        +admin_page: bool
+    }
+    class SidebarShellProps {
+        +children: Children
+    }
+    class SidebarComponentProps {
+        +is_open: bool
+        +on_close: Callback~()~
+    }
+    class AdminCheckWrapperProps {
+        +children: Children
+    }
+    SidebarState --> SidebarExpandState
+    RoomTotalsProps --> TicketPartial
+    UserTotalProps --> UserPartial
+    UserTotalProps --> TicketPartial
+    SidebarShellProps ..> SidebarComponentProps
+
+```
+
+### Sequence Diagrams
+#### 1. System Initialization & Administrator Setup
+
+```mermaid
+sequenceDiagram
+    autonumber
+    actor Admin as Initial Administrator
+    participant FE as Frontend (Yew)
+    participant BE as Backend (Axum)
+    participant DB@{"type": "database", "alias": "Database"}
+
+    Note over Admin, DB: System Initialization Flow
+    FE->>BE: GET /api/check-admin
+    BE->>DB: SELECT COUNT(*) FROM users WHERE is_admin = true
+    DB-->>BE: 0 (No admin found)
+    BE-->>FE: HTTP 200 OK {"exists": false}
+    FE-->>Admin: Render Admin Setup Page
+    Admin->>FE: Input username, password, first/last name
+    FE->>BE: POST /api/setup-admin {username, pwd, ...}
+    Note over BE: Hash password using Argon2
+    BE->>DB: INSERT INTO users (username, pwd, is_admin, ...)
+    DB-->>BE: Success
+    BE-->>FE: HTTP 200 OK {"status": "success"}
+    FE-->>Admin: Redirect to Login Page
+```
+
+#### 2. User Authentication Flow (Login)
+
+```mermaid
+sequenceDiagram
+    autonumber
+    actor User 
+    participant FE as Frontend (Yew)
+    participant BE as Backend (Axum)
+    participant DB as Database@{"type": "database"}
+
+    Note over User, DB: Authentication & Cookie Session Setup
+    User->>FE: Enter username & password
+    FE->>BE: POST /api/login {username, pwd}
+    BE->>DB: SELECT * FROM users WHERE username = $1
+    DB-->>BE: Return user record with password hash
+    Note over BE: Verify password using Argon2
+    alt Password Valid
+        Note over BE: Generate JWT token containing claims (sub: user_id)
+        Note over BE: Build HttpOnly, Secure, Lax cookie 'token'
+        
+        BE-->>FE: HTTP 200 OK {"status": "success", "token": "...", "user": {...}}
+        Note over BE,FE: Header: Set-Cookie: token=...#59; Path=/#59; HttpOnly#59; SameSite=Lax
+ 
+        Note over FE: Save auth state to global context
+        FE-->>User: Redirect to Dashboard / Home
+    else Password Invalid
+        BE-->>FE: HTTP 400 Bad Request {"status": "error", "message": "Invalid password"}
+        FE-->>User: Display error message
+    end
+```
+
+#### 3. Ticket Lifecycle Flow
+
+```mermaid
+sequenceDiagram
+    autonumber
+    actor User as Authenticated User
+    actor Admin as Administrator
+    participant FE as Frontend (Yew)
+    participant BE as Backend (Axum)
+    participant DB as Database@{"type": "database"}
+
+    Note over User, DB: Ticket Creation Flow (Protected Route)
+    User->>FE: Fill out ticket form & submit
+    FE->>BE: POST /api/tickets/create {category, betreff, description, room} (Includes 'token' cookie)
+    Note over BE: validate_token middleware decodes & verifies JWT
+    BE->>DB: INSERT INTO tickets (category, description, betreff, room, user_id)
+    DB-->>BE: Success
+    BE-->>FE: HTTP 200 OK {"status": "success"}
+    FE-->>User: Clear form & display success notification
+
+    Note over Admin, DB: Ticket Review & Resolution (Admin Only Route)
+    Admin->>FE: View Ticket Board
+    FE->>BE: GET /api/tickets (Includes 'token' cookie)
+    Note over BE: validate_token middleware checks JWT
+    BE->>DB: SELECT tickets JOIN users ...
+    DB-->>BE: Return list of tickets
+    BE-->>FE: HTTP 200 OK [tickets]
+    FE-->>Admin: Render Ticket List
+    
+    Admin->>FE: Click "Resolve" on ticket
+    FE->>BE: PATCH /api/tickets/{id} {"status": "Resolved"} (Includes 'token' cookie)
+    Note over BE: validate_admin middleware verifies token & checks is_admin = true
+    BE->>DB: UPDATE tickets SET status = $1 WHERE id = $2
+    DB-->>BE: Success
+    BE-->>FE: HTTP 200 OK {"status": "success"}
+    FE-->>Admin: Update ticket status in UI
+
+    Note over Admin, DB: Ticket Archiving Flow (Admin Only Route)
+    Admin->>FE: Open Archived Tickets page
+    FE->>BE: GET /api/tickets/archive (Includes 'token' cookie)
+    Note over BE: validate_admin middleware verifies token & admin role
+    BE->>DB: SELECT * FROM tickets WHERE status = 'Archived'
+    DB-->>BE: Return archived tickets
+    BE-->>FE: HTTP 200 OK [Archived Tickets]
+    FE-->>Admin: Render historical archive board
+```
+
+## Usage of AI
+
+Github Copilot CLI was used with the model Claude Haiku 4.5 to generate most of the documentation
+
+Google Antigravity generated the Sequence Diagrams
+
+### Prompt 
+Generate comments for cargo doc describing the indivilual components and create links to relevant structs, functions etc.
+
+Generate a sequence diagramm in @[README.md] behind the class diagramms
+
+### Output
+The comments with `///` or `//!`
+I've gone over it and modified it to my needs and opinions
+
+The general structure sequence diagrams above. I've modified and fixed any errors and discrepancys 

backend/Cargo.toml

@@ -6,12 +6,16 @@ edition = "2024"
 [dependencies]
 axum = "0.8.9"
 axum-extra = { version = "0.12.6", features = ["cookie", "typed-header", "form"] }
-serde = { version = "1.0.228", features = ["derive"] }
-serde_json = "1.0.149"
-sqlx = { version = "0.8.6", features = ["postgres", "runtime-tokio", "tls-native-tls", "chrono"] }
+serde = { workspace = true }
+serde_json = { workspace = true }
+sqlx = { version = "0.8.6", features = ["postgres", "runtime-tokio", "tls-native-tls", "chrono", "migrate"] }
 tokio = { version = "1.52.1", features = ["rt-multi-thread", "macros"] }
 dotenv = "0.15.0"
-chrono = { version = "0.4.44", features = ["serde"] }
+chrono = { workspace = true }
 jsonwebtoken = { version = "10.3.0", features = ["rust_crypto"] }
 argon2 = "0.5.3"
 time = "0.3.47"
+tower = "0.5.3"
+tower-http = { version = "0.6.8", features = ["cors"] }
+rand = '0.8'
+hex = '0.4'

backend/migrations/20260422094706_ticket_table.sql

@@ -5,6 +5,6 @@ CREATE TABLE IF NOT EXISTS tickets (
     description TEXT,
     room SMALLINT,
     status VARCHAR(15) NOT NULL DEFAULT 'ToDo',
-    date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    date TIMESTAMP WITH TIME ZONE DEFAULT now(),
     user_id SMALLINT DEFAULT 1
 );

backend/migrations/20260422094717_user_table.sql

@@ -2,7 +2,7 @@ CREATE TABLE users (
     id SMALLINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
     last_name VARCHAR(30),
     first_name VARCHAR(30),
-    username VARCHAR(30),
+    username VARCHAR(30) UNIQUE,
     pwd TEXT,
     is_admin BOOLEAN NOT NULL DEFAULT false
 );

backend/migrations/20260716135845_qr_token.down.sql

@@ -0,0 +1 @@
+DROP TABLE qr_codes;

backend/migrations/20260716135845_qr_token.sql

@@ -0,0 +1,8 @@
+CREATE TABLE qr_codes (
+    id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    user_id SMALLINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash VARCHAR(255) NOT NULL UNIQUE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_qr_token_hash ON qr_codes(token_hash);

backend/src/cookie/jwt.rs

@@ -1,34 +1,78 @@
 use axum::{Json, http::StatusCode};
-use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation, decode, encode};
+use jsonwebtoken::{DecodingKey, EncodingKey, Header, decode, encode};
 use serde::{Deserialize, Serialize};
 
 use crate::models::Claims;
 
+/// Error response for JWT token operations.
+///
+/// Returned when token encoding or decoding fails via `encode_token` or `decode_token`.
+/// Used in error responses for invalid or expired [`Claims`] tokens.
+///
+/// # Fields
+/// - `status`: HTTP status text (e.g., "error")
+/// - `message`: Human-readable error description
 #[derive(Debug, Deserialize, Serialize)]
 pub struct Error {
     pub status: &'static str,
     pub message: String,
 }
 
+/// Encodes user information into a JSON Web Token (JWT).
+///
+/// This function creates a new JWT with the provided user ID as the subject,
+/// sets the issued-at and expiration times (60 minutes from now), and signs it
+/// using the given encoding key. The resulting token is a serialized [`Claims`].
+///
+/// # Arguments
+/// - `header`: The JWT header, specifying the algorithm (e.g., HS256).
+/// - `id`: The user ID (`String`) to be embedded as the subject (`sub`) claim.
+/// - `key`: The `EncodingKey` used to sign the JWT.
+///
+/// # Returns
+/// A `String` representing the encoded JWT containing [`Claims`].
+///
+/// # Panics
+/// Panics if the token encoding fails for any reason (e.g., invalid key).
 pub fn encode_token(header: &Header, id: String, key: &EncodingKey) -> String {
     let now = chrono::Utc::now();
-    let issued = now.timestamp() as usize;
-    let expires = (now + chrono::Duration::minutes(60)).timestamp() as usize;
+    let expires = (now + chrono::Duration::minutes(60)).timestamp();
     let claims: Claims = Claims {
-        subject: id,
-        issued: issued,
-        expires: expires,
+        sub: id,
+        issued: now.timestamp() as usize,
+        expires: expires as usize,
     };
     let token = encode(header, &claims, key);
     return token.expect("token return failed");
 }
 
+/// Decodes and validates a JSON Web Token (JWT).
+///
+/// This function attempts to decode a JWT string, validate its signature and claims
+/// using the provided decoding key. It specifically ignores expiration (`validate_exp`)
+/// and "not before" (`validate_nbf`) claims during validation. Returns the extracted [`Claims`]
+/// on success.
+///
+/// # Arguments
+/// - `token`: The JWT string to decode.
+/// - `key`: The `DecodingKey` used to verify the JWT's signature.
+///
+/// # Returns
+/// - `Ok(Claims)`: If the token is successfully decoded and verified, returns the extracted [`Claims`].
+/// - `Err((StatusCode, Json<Error>))`: If the token is invalid, expired, or cannot be decoded,
+///   returns an `UNAUTHORIZED` status code along with a JSON error message.
 pub fn decode_token(token: String, key: &DecodingKey) -> Result<Claims, (StatusCode, Json<Error>)> {
-    let claims = decode::<Claims>(&token, key, &Validation::default())
-        .map_err(|_| {
+    let mut validation = jsonwebtoken::Validation::new(jsonwebtoken::Algorithm::HS256);
+    validation.validate_exp = false;
+    validation.validate_nbf = false;
+    validation.leeway = 0;
+
+    let claims = decode::<Claims>(&token, key, &validation)
+        .map_err(|err| {
+            let message = format!("Invalid Token: {}", err);
             let error = Error {
                 status: "error",
-                message: "Invalid Token".to_string(),
+                message,
             };
             (StatusCode::UNAUTHORIZED, Json(error))
         })?

backend/src/cookie/mod.rs

@@ -1 +1,7 @@
+//! This module aggregates and re-exports all cookie-related functionalities,
+//! including JWT handling and validation middleware.
+//!
+//! It serves as a central point for managing session and authentication cookies
+//! within the application.
 pub mod jwt;
+pub mod validation;

backend/src/cookie/validation.rs

@@ -0,0 +1,213 @@
+use std::sync::Arc;
+
+use axum::{
+    Json,
+    body::Body,
+    extract::State,
+    http::{Request, StatusCode, header},
+    middleware::Next,
+    response::IntoResponse,
+};
+use axum_extra::extract::CookieJar;
+use jsonwebtoken::DecodingKey;
+use serde_json::json;
+
+use crate::{AppState, cookie::jwt::decode_token, handlers::auth::filter_user, models::User};
+
+/// Axum middleware to validate a JWT token present in cookies or Authorization header.
+///
+/// This function extracts a JWT from the request (either from the `token` cookie or
+/// the `Authorization: Bearer` header), decodes and validates it using [`decode_token`](`crate::cookie::jwt::decode_token`)).
+/// If valid, it fetches the corresponding [`User`] from the database and inserts a
+/// [`FilteredUser`](crate::models::FilteredUser)
+/// (converted via [`filter_user`](`crate::handlers::auth::filter_user`)) into the request extensions for subsequent handlers to use.
+///
+/// If the token is missing, invalid, or the user is not found, it returns an
+/// appropriate error response (401 Unauthorized).
+///
+/// # Arguments
+/// - `cookies`: The `CookieJar` from the request, used to extract the `token` cookie.
+/// - `State(data)`: Application state containing `AppState` for database access and `token_secret`.
+/// - `mut request`: The incoming HTTP request, which will have user data injected into its extensions.
+/// - `next`: The next middleware or handler in the chain.
+///
+/// # Returns
+/// - `Ok(impl IntoResponse)`: If validation succeeds, the request proceeds to the next handler.
+/// - `Err((StatusCode, Json<serde_json::Value>))`: An error response if validation fails.
+pub async fn validate_token(
+    cookies: CookieJar,
+    State(data): State<Arc<AppState>>,
+    mut request: Request<Body>,
+    next: Next,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let token = cookies
+        .get("token")
+        .map(|cookie| cookie.value().to_string())
+        .or_else(|| {
+            request
+                .headers()
+                .get(header::AUTHORIZATION)
+                .and_then(|header| header.to_str().ok())
+                .and_then(|value| {
+                    if value.starts_with("Bearer ") {
+                        Some(value[7..].to_owned())
+                    } else {
+                        None
+                    }
+                })
+        });
+
+    let token = token.ok_or_else(|| {
+        let error = json!({
+            "status": "error",
+            "message": "Please provide a valid token"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    let claims = decode_token(
+        token,
+        &DecodingKey::from_secret(data.env.token_secret.as_ref()),
+    )
+    .map_err(|(status, json_err)| {
+        let error = json!({
+            "status": json_err.status,
+            "message": json_err.message
+        });
+        (status, Json(error))
+    })?;
+
+    let uuid = (&claims.sub).parse::<i16>().map_err(|_| {
+        let error = json!({
+            "status": "error",
+            "message": "Invalid user id"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    let user = sqlx::query_as::<_, User>(r#"SELECT * FROM users WHERE id = $1"#)
+        .bind(uuid)
+        .fetch_optional(&data.db)
+        .await
+        .map_err(|e| {
+            let error = json!({
+                "status": "error",
+                "message": format!("Database error: {}", e)
+            });
+            (StatusCode::INTERNAL_SERVER_ERROR, Json(error))
+        })?;
+
+    let user = user.ok_or_else(|| {
+        let error = json!({
+            "status": "error",
+            "message": "Invalid user"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    request.extensions_mut().insert(filter_user(&user));
+    Ok(next.run(request).await)
+}
+
+/// Axum middleware to validate JWT token and ensure the authenticated user has admin privileges.
+///
+/// This middleware first performs all checks of [`validate_token`]: extracting, decoding,
+/// and validating the JWT via [`decode_token`](`crate::cookie::jwt::decode_token`), and fetching the associated [`User`] from the database.
+/// Additionally, it verifies that the fetched user has `is_admin` set to `true`. Returns a [`FilteredUser`](crate::models::FilteredUser)
+/// (converted via [`filter_user`](`crate::handlers::auth::filter_user`)) in the request extensions if both authentication and admin status are valid.
+///
+/// If the user is not authenticated or not an administrator, it returns an
+/// appropriate error response (401 Unauthorized or 403 Forbidden).
+///
+/// # Arguments
+/// - `cookies`: The `CookieJar` from the request.
+/// - `State(data)`: Application state containing `AppState`.
+/// - `mut request`: The incoming HTTP request, which will have admin user data injected.
+/// - `next`: The next middleware or handler in the chain.
+///
+/// # Returns
+/// - `Ok(impl IntoResponse)`: If validation and admin check succeed, the request proceeds.
+/// - `Err((StatusCode, Json<serde_json::Value>))`: An error response if validation fails
+///   or the user is not an admin.
+pub async fn validate_admin(
+    cookies: CookieJar,
+    State(data): State<Arc<AppState>>,
+    mut request: Request<Body>,
+    next: Next,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let token = cookies
+        .get("token")
+        .map(|cookie| cookie.value().to_string())
+        .or_else(|| {
+            request
+                .headers()
+                .get(header::AUTHORIZATION)
+                .and_then(|header| header.to_str().ok())
+                .and_then(|value| {
+                    if value.starts_with("Bearer ") {
+                        Some(value[7..].to_owned())
+                    } else {
+                        None
+                    }
+                })
+        });
+
+    let token = token.ok_or_else(|| {
+        let error = json!({
+            "status": "error",
+            "message": "Please provide a valid token"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    let claims = decode_token(
+        token,
+        &DecodingKey::from_secret(data.env.token_secret.as_ref()),
+    )
+    .map_err(|(status, json_err)| {
+        let error = json!({
+            "status": json_err.status,
+            "message": json_err.message
+        });
+        (status, Json(error))
+    })?;
+
+    let uuid = (&claims.sub).parse::<i16>().map_err(|_| {
+        let error = json!({
+            "status": "error",
+            "message": "Invalid user id"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    let user = sqlx::query_as::<_, User>(r#"SELECT * FROM users WHERE id = $1"#)
+        .bind(uuid)
+        .fetch_optional(&data.db)
+        .await
+        .map_err(|e| {
+            let error = json!({
+                "status": "error",
+                "message": format!("Database error: {}", e)
+            });
+            (StatusCode::INTERNAL_SERVER_ERROR, Json(error))
+        })?;
+
+    let user = user.ok_or_else(|| {
+        let error = json!({
+            "status": "error",
+            "message": "Invalid user"
+        });
+        (StatusCode::UNAUTHORIZED, Json(error))
+    })?;
+
+    if !user.is_admin {
+        let error = json!({
+            "status": "error",
+            "message": "Admin access required"
+        });
+        return Err((StatusCode::FORBIDDEN, Json(error)));
+    }
+
+    request.extensions_mut().insert(filter_user(&user));
+    Ok(next.run(request).await)
+}

backend/src/env.rs

@@ -1,16 +1,54 @@
+/// Environment configuration for the application.
+///
+/// Loads required configuration from environment variables at startup.
+/// All variables must be present or the application will panic during [`Env::load`].
+/// Used by [`AppState`](crate::AppState) for configuring JWT signing and CORS.
+///
+/// # Fields
+/// - `db_url`: PostgreSQL database connection URL
+/// - `token_secret`: Secret key used to sign and verify [`Claims`](crate::models::Claims) in JWT tokens
+/// - `origin`: Frontend origin URL for CORS policy configuration
+///
+/// # Required Environment Variables
+/// - `DATABASE_URL`: PostgreSQL connection string (e.g., `postgresql://user:pass@localhost/dbname`)
+/// - `TOKEN_SECRET`: Secret key for JWT token signing (use a strong random string in production)
+/// - `ORIGIN`: Frontend URL for CORS (e.g., `http://localhost:8080`)
 #[derive(Debug, Clone)]
 pub struct Env {
+    /// PostgreSQL database connection URL
     pub db_url: String,
+    /// Secret key used to sign and verify JWT tokens
     pub token_secret: String,
+    /// Frontend origin URL for CORS policy
+    pub origin: String,
 }
 
 impl Env {
+    /// Loads environment configuration from system environment variables.
+    ///
+    /// Reads `DATABASE_URL`, `TOKEN_SECRET`, and `ORIGIN` from the environment and returns
+    /// a configured [`Env`] instance. Used during server initialization in the `main` function.
+    ///
+    /// # Panics
+    /// If any required variable is missing (DATABASE_URL, TOKEN_SECRET, or ORIGIN).
+    ///
+    /// # Example
+    /// ```ignore
+    /// let env = Env::load();
+    /// // Environment must have DATABASE_URL, TOKEN_SECRET, and ORIGIN set
+    /// let app_state = AppState {
+    ///     db: pool,
+    ///     env,
+    /// };
+    /// ```
     pub fn load() -> Env {
         let db_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
         let token_secret = std::env::var("TOKEN_SECRET").expect("TOKEN_SECRET must be set");
+        let origin = std::env::var("ORIGIN").expect("ORIGIN must be set");
         Env {
             db_url,
             token_secret,
+            origin,
         }
     }
 }

backend/src/handlers/auth.rs

@@ -1,26 +1,41 @@
-use std::{sync::Arc, usize};
+use std::sync::Arc;
 
 use argon2::{
     Argon2, PasswordHash, PasswordHasher, PasswordVerifier,
     password_hash::{SaltString, rand_core::OsRng},
 };
 use axum::{
-    Json,
-    extract::State,
+    Extension, Json,
+    extract::{Path, State},
     http::{Response, StatusCode, header},
     response::IntoResponse,
 };
 use axum_extra::extract::cookie::{Cookie, SameSite};
-use chrono::format;
 use jsonwebtoken::{EncodingKey, Header};
 use serde_json::json;
 
 use crate::{
     AppState,
     cookie::jwt::encode_token,
-    models::{FilteredUser, LoginModel, LoginScheme, UserCreateScheme},
+    models::{FilteredUser, LoginScheme, User, UserCreateScheme, UserUpdateScheme},
 };
 
+/// Registers a new user in the system.
+///
+/// Creates a new [`User`] account with the provided [`UserCreateScheme`] credentials.
+/// The password is hashed using Argon2 before being stored. Only administrators can create new users.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+/// - `request`: [`UserCreateScheme`] containing user details including first/last name, username, admin flag, and password
+///
+/// # Returns
+/// - `200 OK` on successful user creation
+/// - `400 Bad Request` if username/password missing or user already exists
+/// - `500 Internal Server Error` if database insertion fails
+///
+/// # Password Hashing
+/// Uses Argon2 with a cryptographically secure random salt.
 pub async fn create_user(
     State(data): State<Arc<AppState>>,
     Json(request): Json<UserCreateScheme>,
@@ -84,11 +99,40 @@ pub async fn create_user(
     }
 }
 
+/// Authenticates a user and creates a JWT token for session management.
+///
+/// Verifies the provided username and password against stored credentials using Argon2 verification.
+/// On successful authentication, generates and encodes a [`Claims`](crate::models::Claims) token via [`encode_token`](`crate::cookie::jwt::encode_token`) and sets it as an HTTP-only cookie.
+/// The token is valid for 1 hour.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+/// - `request`: [`LoginScheme`] containing login credentials (username, password)
+///
+/// # Returns
+/// - `200 OK` with JSON containing token and filtered [`FilteredUser`] info
+/// - `400 Bad Request` if username not found or password invalid
+/// - `500 Internal Server Error` if database query fails
+///
+/// # Security Features
+/// - HTTP-only cookie prevents JavaScript access
+/// - SameSite=Lax protects against CSRF attacks
+/// - Password verification uses Argon2 with stored [`User`] hash
+/// - JWT token includes user ID and expiration timestamp via [`Claims`](crate::models::Claims) encoded by [`encode_token`](`crate::cookie::jwt::encode_token`)
+///
+/// # Example Response
+/// ```json
+/// {
+///   "status": "success",
+///   "token": "eyJ0eXAiOiJKV1QiLCJhbGc...",
+///   "user": {"id": 1, "first_name": "Admin", "last_name": "User", "username": "admin", "is_admin": true}
+/// }
+/// ```
 pub async fn login(
     State(data): State<Arc<AppState>>,
     Json(request): Json<LoginScheme>,
 ) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
-    let user = sqlx::query_as::<_, LoginModel>(r#"SELECT * FROM users WHERE username = $1"#)
+    let user = sqlx::query_as::<_, User>(r#"SELECT * FROM users WHERE username = $1"#)
         .bind(request.username)
         .fetch_optional(&data.db)
         .await
@@ -131,7 +175,7 @@ pub async fn login(
         .http_only(true);
 
     let mut response = Response::new(
-        json!({"status": "success", "token": token, "user": filter_users(&user)}).to_string(),
+        json!({"status": "success", "token": token, "user": filter_user(&user)}).to_string(),
     );
     response
         .headers_mut()
@@ -139,6 +183,24 @@ pub async fn login(
     Ok(response)
 }
 
+/// Logs out the current user by invalidating their session cookie.
+///
+/// Sets the authentication cookie to expire immediately (max_age = -1 hour) which causes
+/// the browser to discard it. This effectively logs the user out without requiring server-side
+/// session invalidation. The cookie no longer contains a valid [`Claims`](crate::models::Claims) token.
+///
+/// # Returns
+/// Always returns `200 OK` with success message and an expired cookie header
+///
+/// # Security
+/// - HTTP-only cookie prevents client-side manipulation
+/// - SameSite=Lax protects against CSRF
+/// - Setting max_age to negative value causes immediate expiration
+///
+/// # Example Response
+/// ```json
+/// {"status": "success", "message": "successfully logged out"}
+/// ```
 pub async fn logout() -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
     let cookie = Cookie::build(("token", ""))
         .path("/")
@@ -155,11 +217,416 @@ pub async fn logout() -> Result<impl IntoResponse, (StatusCode, Json<serde_json:
     Ok(response)
 }
 
-fn filter_users(user: &LoginModel) -> FilteredUser {
+/// Retrieves the currently authenticated user's information.
+///
+/// Uses the [`FilteredUser`] data embedded in the JWT token (via middleware).
+/// Useful for frontends to display logged-in user info or verify authentication.
+///
+/// # Returns
+/// - `200 OK` with [`FilteredUser`] data (excluding password)
+/// - Automatically returns `401 Unauthorized` if not authenticated (middleware)
+///
+/// # Example Response
+/// ```json
+/// {
+///   "status": "success",
+///   "data": {
+///     "id": 1,
+///     "first_name": "Admin",
+///     "last_name": "User",
+///     "is_admin": true
+///   }
+/// }
+/// ```
+pub async fn get_current_user(
+    Extension(user): Extension<FilteredUser>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let response = json!({
+        "status": "success",
+        "data": json!({
+            "id": user.id,
+            "first_name": user.first_name,
+            "last_name": user.last_name,
+            "is_admin": user.is_admin
+        })
+    });
+
+    Ok(Json(response))
+}
+
+/// Deletes a user account from the system.
+///
+/// Only admins can delete users (enforced by middleware). The [`User`] account and all associated data is removed.
+/// Note: Tickets created by deleted users will have NULL user_id references.
+///
+/// # Arguments
+/// - `Path(id)`: [`User`] ID to delete, extracted from URL path
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Returns
+/// - `204 No Content` on successful deletion
+/// - `404 Not Found` if user doesn't exist
+/// - `500 Internal Server Error` if database error occurs
+pub async fn delete_user(
+    Path(id): Path<i16>,
+    State(data): State<Arc<AppState>>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let query = sqlx::query(r#"DELETE FROM users WHERE id = $1"#)
+        .bind(id)
+        .execute(&data.db)
+        .await
+        .map_err(|e| {
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"status": "error", "message": format!("{:?}", e)})),
+            )
+        })?;
+
+    if query.rows_affected() == 0 {
+        let error = json!({
+            "status": "error",
+            "message": format!("User with ID {} not found", id)
+        });
+        return Err((StatusCode::NOT_FOUND, Json(error)));
+    }
+
+    Ok(StatusCode::NO_CONTENT)
+}
+
+/// Retrieves all users in the system.
+///
+/// Only admins can call this endpoint (enforced by middleware). Returns all [`User`] records converted to [`FilteredUser`]
+/// and sorted alphabetically by last name. Password hashes are not included in the response.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Returns
+/// - `200 OK` with array of [`FilteredUser`] objects
+/// - `500 Internal Server Error` if database query fails
+///
+/// # Example Response
+/// ```json
+/// [
+///   {
+///     "id": 1,
+///     "first_name": "Admin",
+///     "last_name": "User",
+///     "username": "admin",
+///     "is_admin": true
+///   },
+///   {
+///     "id": 2,
+///     "first_name": "Regular",
+///     "last_name": "User",
+///     "username": "regularuser",
+///     "is_admin": false
+///   }
+/// ]
+/// ```
+pub async fn get_users(
+    State(data): State<Arc<AppState>>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let users = sqlx::query_as::<_, User>(r#"SELECT * FROM users ORDER BY last_name ASC"#)
+        .fetch_all(&data.db)
+        .await
+        .map_err(|e| {
+            let error = json!({
+                "status": "error",
+                "message": format!("{:?}", e)
+            });
+            (StatusCode::INTERNAL_SERVER_ERROR, Json(error))
+        })?;
+
+    let response = users
+        .iter()
+        .map(|user| filter_user(&user))
+        .collect::<Vec<FilteredUser>>();
+    let json_respnse = json!(response);
+    Ok(Json(json_respnse))
+}
+
+/// Retrieves a single user's details by their ID.
+///
+/// This endpoint allows fetching a specific [`User`]'s information. It returns a [`FilteredUser`]
+/// object (converted via [`filter_user`]), ensuring sensitive data like password hashes are not exposed.
+///
+/// # Arguments
+/// - `Path(id)`: The ID of the [`User`] to retrieve, extracted from the URL path.
+/// - `State(data)`: Application state containing [`AppState`] for database access.
+///
+/// # Returns
+/// - `200 OK` with a [`FilteredUser`] JSON object if the user is found.
+/// - `404 Not Found` if a user with the given ID does not exist.
+/// - `500 Internal Server Error` if a database query error occurs.
+///
+pub async fn get_user_by_id(
+    Path(id): Path<i16>,
+    State(data): State<Arc<AppState>>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let query = sqlx::query_as::<_, User>(r#"SELECT * FROM users WHERE id = $1"#)
+        .bind(id)
+        .fetch_one(&data.db)
+        .await;
+
+    match query {
+        Ok(user) => {
+            let response = serde_json::json!(filter_user(&user));
+            return Ok(Json(response));
+        }
+        Err(sqlx::Error::RowNotFound) => {
+            let error_response = serde_json::json!({
+                "status": "fail",
+                "message": format!("User with ID {} not found", id)
+            });
+            return Err((StatusCode::NOT_FOUND, Json(error_response)));
+        }
+        Err(e) => {
+            return Err((
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"status": "error", "message": format!("{:?}", e)})),
+            ));
+        }
+    };
+}
+
+/// Updates an existing user's information.
+///
+/// This endpoint allows administrators to modify a [`User`]'s `first_name`, `last_name`,
+/// `username`, `is_admin` status, and optionally their password. If `new_pwd` in the
+/// request body is an empty string, the user's password remains unchanged.
+///
+/// # Arguments
+/// - `Path(id)`: The ID of the [`User`] to update, extracted from the URL path.
+/// - `State(data)`: Application state containing [`AppState`] for database access.
+/// - `Json(body)`: [`UserUpdateScheme`] containing the fields to update.
+///
+/// # Returns
+/// - `200 OK` with the [`FilteredUser`] object of the updated user (converted via [`filter_user`]).
+/// - `404 Not Found` if a user with the given ID does not exist.
+/// - `500 Internal Server Error` if a database query or password hashing error occurs.
+///
+/// # Security Note
+/// - Passwords are hashed using Argon2 before storage.
+/// - This endpoint requires admin privileges (enforced by middleware via
+///   [`validate_admin`](crate::cookie::validation::validate_admin)).
+pub async fn update_user(
+    Path(id): Path<i16>,
+    State(data): State<Arc<AppState>>,
+    Json(body): Json<UserUpdateScheme>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let update_result = if !body.new_pwd.is_empty() {
+        let argon = Argon2::default();
+        let salt = SaltString::generate(&mut OsRng);
+        let hashed_pwd = match argon.hash_password(body.new_pwd.clone().as_bytes(), &salt) {
+            Ok(h) => h.to_string(),
+            Err(e) => panic!("Error hashing {:}", e),
+        };
+
+        sqlx::query(r#"UPDATE users SET first_name = $1, last_name = $2, username = $3, pwd = $4, is_admin = $5 WHERE id = $6"#)
+            .bind(body.first_name.to_owned())
+            .bind(body.last_name.to_owned())
+            .bind(body.username.to_owned())
+            .bind(hashed_pwd)
+            .bind(body.make_admin.to_owned())
+            .bind(id)
+            .execute(&data.db)
+            .await
+    } else {
+        sqlx::query(r#"UPDATE users SET first_name = $1, last_name = $2, username = $3, is_admin = $4 WHERE id = $5"#)
+            .bind(body.first_name.to_owned())
+            .bind(body.last_name.to_owned())
+            .bind(body.username.to_owned())
+            .bind(body.make_admin.to_owned())
+            .bind(id)
+            .execute(&data.db)
+            .await
+    }
+    .map_err(|e| {
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"status": "error", "message": format!("{:?}", e)})),
+        )
+    })?;
+
+    if update_result.rows_affected() == 0 {
+        let error_response = serde_json::json!({
+            "status": "error",
+            "message": format!("User with ID {} not found", id)
+        });
+        return Err((StatusCode::INTERNAL_SERVER_ERROR, Json(error_response)));
+    }
+
+    let updated_user = sqlx::query_as::<_, User>(r#"SELECT * FROM users WHERE id = $1"#)
+        .bind(id)
+        .fetch_one(&data.db)
+        .await
+        .map_err(|e| {
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"status": "error", "message": format!("{:?}", e)})),
+            )
+        })?;
+
+    let response = serde_json::json!({
+        "user": filter_user(&updated_user),
+        "status": "success"
+    });
+
+    Ok(Json(response))
+}
+
+/// Checks if any administrator user exists in the system.
+///
+/// This endpoint is used during initialization to determine if the setup page should be displayed.
+/// It counts all [`User`] records with `is_admin = true` in the database.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Returns
+/// - `200 OK` with JSON: `{"has_admin": bool}` - Whether at least one admin exists
+/// - `500 Internal Server Error` if database query fails
+///
+/// # Example Response
+/// ```json
+/// {"has_admin": false}
+/// ```
+pub async fn check_admin_exists(
+    State(data): State<Arc<AppState>>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    let admin_count =
+        sqlx::query_scalar::<_, i64>(r#"SELECT COUNT(*) FROM users WHERE is_admin = true"#)
+            .fetch_one(&data.db)
+            .await
+            .map_err(|e| {
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(json!({"status": "error", "message": format!("{:?}", e)})),
+                )
+            })?;
+
+    let has_admin = admin_count > 0;
+    Ok(Json(json!({"has_admin": has_admin})))
+}
+
+/// Creates the initial administrator account for a fresh system.
+///
+/// This function handles the one-time setup of the first admin [`User`]. It checks that no admin exists
+/// before allowing creation via database count. This endpoint is only functional when the system has no administrators.
+/// Once created, subsequent admin registrations must go through the normal `create_user` endpoint
+/// with proper authorization.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+/// - `request`: [`UserCreateScheme`] containing user creation details (first_name, last_name, username, password)
+///
+/// # Returns
+/// - `200 OK` with success message if admin account created
+/// - `400 Bad Request` if:
+///   - Admin already exists (checked via admin count)
+///   - Username or password is empty
+/// - `500 Internal Server Error` if database insertion fails
+///
+/// # Security Note
+/// The password is hashed using Argon2 with a random salt before storage.
+pub async fn setup_initial_admin(
+    State(data): State<Arc<AppState>>,
+    Json(request): Json<UserCreateScheme>,
+) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    // Check if any admin already exists
+    let admin_count =
+        sqlx::query_scalar::<_, i64>(r#"SELECT COUNT(*) FROM users WHERE is_admin = true"#)
+            .fetch_one(&data.db)
+            .await
+            .map_err(|e| {
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Json(json!({"status": "error", "message": format!("{:?}", e)})),
+                )
+            })?;
+
+    if admin_count > 0 {
+        return Err((
+            StatusCode::BAD_REQUEST,
+            Json(json!({"status": "error", "message": "Admin user already exists"})),
+        ));
+    }
+
+    if request.username.is_empty() || request.pwd.is_empty() {
+        return Err((
+            StatusCode::BAD_REQUEST,
+            Json(json!({"status": "error", "message": "Missing credential"})),
+        ));
+    }
+
+    let argon = Argon2::default();
+    let salt = SaltString::generate(&mut OsRng);
+    let hashed_pwd = match argon.hash_password(request.pwd.clone().as_bytes(), &salt) {
+        Ok(h) => h.to_string(),
+        Err(e) => panic!("Error hashing {:}", e),
+    };
+
+    let user = sqlx::query("INSERT INTO users (username, pwd, first_name, last_name, is_admin) VALUES ($1, $2, $3, $4, $5)")
+        .bind(request.username)
+        .bind(&hashed_pwd)
+        .bind(request.first_name)
+        .bind(request.last_name)
+        .bind(true)
+        .execute(&data.db)
+        .await
+        .map_err(|e| {
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(json!({"status": "error", "message": format!("{}", e)})),
+            )
+        })?;
+
+    if user.rows_affected() < 1 {
+        return Err((
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"status": "error", "message": "Error creating admin user"})),
+        ));
+    } else {
+        Ok(Json(
+            json!({"status": "success", "result": "Admin user created"}),
+        ))
+    }
+}
+
+/// Converts a [`User`] with sensitive data into a [`FilteredUser`] safe for API responses.
+///
+/// This function removes password hashes and other sensitive information before
+/// returning [`User`] data to clients. Always use this helper instead of directly
+/// serializing [`User`] objects.
+/// Used by all authentication endpoints to ensure passwords are never exposed.
+///
+/// # Arguments
+/// - `user`: Reference to the internal [`User`] struct containing password hash
+///
+/// # Returns
+/// [`FilteredUser`] with only safe-to-share information:
+/// - `id`: User ID
+/// - `first_name`, `last_name`: User name
+/// - `username`: Login username
+/// - `is_admin`: Admin privilege flag
+///
+/// # Important
+/// The password hash is explicitly **NOT** included in the output. This prevents
+/// accidental exposure of sensitive authentication data.
+///
+/// # Example
+/// ```ignore
+/// let user = get_user_from_db(1).await?;
+/// let safe_user = filter_user(&user);  // Convert User to FilteredUser
+/// // safe_user can be safely serialized and sent to client
+/// ```
+pub fn filter_user(user: &User) -> FilteredUser {
     FilteredUser {
         id: user.id,
         first_name: user.first_name.clone(),
         last_name: user.last_name.clone(),
+        username: user.username.clone(),
         is_admin: user.is_admin.clone(),
     }
 }

backend/src/handlers/mod.rs

@@ -1,2 +1,7 @@
+//! This module aggregates and re-exports all API endpoint handler functions.
+//!
+//! It serves as a central point for managing the logic that responds to various
+//! HTTP requests, categorizing handlers by their domain (e.g., authentication, tickets).
 pub mod auth;
+pub mod qr;
 pub mod ticket;

backend/src/handlers/qr.rs

@@ -0,0 +1,130 @@
+use std::sync::Arc;
+
+use argon2::{Argon2, PasswordHash, PasswordHasher, PasswordVerifier, password_hash::SaltString};
+use axum::{
+    Json,
+    extract::{Query, State},
+    http::{StatusCode, header::SET_COOKIE},
+    response::{Html, IntoResponse, Response},
+};
+use jsonwebtoken::{EncodingKey, Header};
+use rand::{RngCore, thread_rng};
+use serde::{Deserialize, Serialize};
+use sqlx::Row;
+
+use crate::{AppState, cookie::jwt::encode_token};
+
+#[derive(Serialize)]
+pub struct QrCodeResponse {
+    pub raw_token: String,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct AuthQuery {
+    pub token: String,
+}
+
+#[derive(Deserialize)]
+pub struct GenerateQrRequest {
+    pub user_id: i16,
+}
+
+pub async fn generate_qr_token(
+    State(data): State<Arc<AppState>>,
+    Json(payload): Json<GenerateQrRequest>,
+) -> Result<impl IntoResponse, StatusCode> {
+    let mut token_bytes = [0u8; 32];
+    thread_rng().fill_bytes(&mut token_bytes);
+    let raw_token = hex::encode(token_bytes);
+
+    let salt = SaltString::generate(&mut thread_rng());
+
+    let argon2 = Argon2::default();
+    let token_hash = argon2
+        .hash_password(raw_token.as_bytes(), &salt)
+        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?
+        .to_string();
+
+    sqlx::query("INSERT INTO qr_codes (user_id, token_hash) VALUES ($1, $2)")
+        .bind(payload.user_id)
+        .bind(token_hash)
+        .execute(&data.db)
+        .await
+        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
+
+    Ok((StatusCode::CREATED, Json(QrCodeResponse { raw_token })))
+}
+
+pub async fn validate_qr_token(
+    State(data): State<Arc<AppState>>,
+    Query(params): Query<AuthQuery>,
+) -> Response {
+    let active_tokens_res = sqlx::query("SELECT user_id, token_hash FROM qr_codes")
+        .fetch_all(&data.db)
+        .await;
+
+    let active_tokens = match active_tokens_res {
+        Ok(tokens) => tokens,
+        Err(_) => return StatusCode::INTERNAL_SERVER_ERROR.into_response(),
+    };
+
+    let mut authenticated_user_id: Option<i16> = None;
+    let argon2 = Argon2::default();
+
+    for record in active_tokens {
+        let user_id: i16 = record.get("user_id");
+        let token_hash: String = record.get("token_hash");
+
+        if let Ok(parsed_hash) = PasswordHash::new(&token_hash) {
+            if argon2
+                .verify_password(params.token.as_bytes(), &parsed_hash)
+                .is_ok()
+            {
+                authenticated_user_id = Some(user_id);
+                break;
+            }
+        }
+    }
+
+    if let Some(user_id) = authenticated_user_id {
+        let base_origin = data.env.origin.trim_end_matches('/');
+
+        let header = Header::default();
+        let id_str = user_id.to_string();
+        let secret_bytes = data.env.token_secret.as_bytes();
+        let encoding_key = EncodingKey::from_secret(secret_bytes);
+
+        let token = encode_token(&header, id_str, &encoding_key);
+
+        let cookie_value = format!(
+            "token={}; Path=/; HttpOnly; SameSite=Lax; Max-Age=3600",
+            token
+        );
+
+        let redirect_html = format!(
+            r#"<!DOCTYPE html>
+            <html>
+            <head>
+                <meta http-equiv="refresh" content="0; url={}/" />
+                <script type="text/javascript">
+                    window.location.href = "{}/"
+                </script>
+                <title>Redirecting...</title>
+            </head>
+            <body>
+                <p>Authenticated! Redirecting you to the dashboard...</p>
+            </body>
+            </html>"#,
+            base_origin, base_origin
+        );
+
+        let mut response = Html(redirect_html).into_response();
+        if let Ok(header_value) = axum::http::HeaderValue::from_str(&cookie_value) {
+            response.headers_mut().insert(SET_COOKIE, header_value);
+        }
+
+        response
+    } else {
+        StatusCode::UNAUTHORIZED.into_response()
+    }
+}

backend/src/handlers/ticket.rs

@@ -1,30 +1,51 @@
 use std::sync::Arc;
 
 use axum::{
-    Json,
+    Extension, Json,
     extract::{Path, State},
     http::StatusCode,
     response::IntoResponse,
 };
 use serde_json::json;
-use sqlx::query;
+use sqlx::{Row, query};
 
 use crate::{
     AppState,
-    models::{Ticket, TicketCreateScheme, TicketResponse, TicketUpdateScheme},
+    models::{FilteredUser, TicketCreateScheme, TicketResponse, TicketUpdateScheme},
 };
 
+/// Creates a new support ticket.
+///
+/// Associates the ticket with the authenticated [`FilteredUser`] and sets the current timestamp.
+/// Converts the [`TicketCreateScheme`] request into a database record.
+/// Tickets are automatically created with "open" status.
+///
+/// # Arguments
+/// - `Extension(user)`: Authenticated [`FilteredUser`] (extracted from JWT token via middleware)
+/// - `State(data)`: Application state containing [`AppState`] for database access
+/// - `Json(body)`: [`TicketCreateScheme`] containing ticket details (category, subject, description, room)
+///
+/// # Returns
+/// - `200 OK` on successful creation
+/// - `500 Internal Server Error` if database insertion fails
+///
+/// # Database Fields Set Automatically
+/// - `user_id`: From authenticated user
+/// - `status`: Defaults to "open"
+/// - `date`: Current UTC timestamp
 pub async fn create_ticket(
+    Extension(user): Extension<FilteredUser>,
     State(data): State<Arc<AppState>>,
     Json(body): Json<TicketCreateScheme>,
 ) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
     let query = query(
-        r#"INSERT INTO tickets (category, description, betreff, room) VALUES ($1, $2, $3, $4)"#,
+        r#"INSERT INTO tickets (category, description, betreff, room, user_id) VALUES ($1, $2, $3, $4, $5)"#,
     )
     .bind(body.category.to_string())
     .bind(body.description.to_string())
     .bind(body.betreff.to_string())
     .bind(body.room)
+    .bind(user.id)
     .execute(&data.db)
     .await;
 
@@ -39,6 +60,18 @@ pub async fn create_ticket(
     Ok(Json(response_status))
 }
 
+/// Deletes a ticket by ID.
+///
+/// Only admins can delete tickets (enforced by middleware). Removes the [`TicketResponse`] and associated data from the database.
+///
+/// # Arguments
+/// - `Path(id)`: Ticket ID to delete, extracted from URL path
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Returns
+/// - `204 No Content` on successful deletion
+/// - `404 Not Found` if ticket doesn't exist
+/// - `500 Internal Server Error` if database error occurs
 pub async fn delete_ticket(
     Path(id): Path<i32>,
     State(data): State<Arc<AppState>>,
@@ -65,11 +98,48 @@ pub async fn delete_ticket(
     Ok(StatusCode::NO_CONTENT)
 }
 
+/// Retrieves all non-archived tickets.
+///
+/// Returns a list of all active [`TicketResponse`] objects with user information denormalized for easier rendering.
+/// Tickets are ordered by creation date (newest first). Joins with [`User`](crate::models::User) table to include creator information.
+///
+/// # Arguments
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Filtering
+/// - Excludes tickets with status "Archived"
+/// - Uses LEFT JOIN to include creator information from [`User`](crate::models::User)
+///
+/// # Returns
+/// - `200 OK` with array of [`TicketResponse`] objects
+/// - `500 Internal Server Error` if database query fails
+///
+/// # Example Response
+/// ```json
+/// [
+///   {
+///     "id": 1,
+///     "category": "maintenance",
+///     "betreff": "Broken light",
+///     "description": "Ceiling light not working",
+///     "room": 101,
+///     "status": "open",
+///     "date": "2024-01-15T10:30:00Z",
+///     "user_id": 5,
+///     "user_first_name": "John",
+///     "user_last_name": "Doe"
+///   }
+/// ]
+/// ```
 pub async fn get_tickets(
     State(data): State<Arc<AppState>>,
 ) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
-    let tickets = sqlx::query_as::<_, Ticket>(
-        r#"SELECT * FROM tickets WHERE status <> 'Archived' ORDER BY date DESC"#,
+    // Query tickets with denormalized user info, excluding archived tickets
+    let tickets = sqlx::query(
+        r#"SELECT t.id, t.category, t.betreff, t.description, t.room, t.status, t.date, t.user_id, u.first_name, u.last_name
+           FROM tickets t
+           LEFT JOIN users u ON t.user_id = u.id
+           ORDER BY t.date DESC"#,
     )
     .fetch_all(&data.db)
     .await
@@ -81,28 +151,86 @@ pub async fn get_tickets(
         (StatusCode::INTERNAL_SERVER_ERROR, Json(error_response))
     })?;
 
-    let ticket_response = tickets
+    // Transform raw database rows into TicketResponse structs
+    let ticket_response: Vec<TicketResponse> = tickets
         .iter()
-        .map(|ticket| filter_record(&ticket))
-        .collect::<Vec<TicketResponse>>();
+        .map(|row| TicketResponse {
+            id: row.get("id"),
+            category: row.get("category"),
+            betreff: row.get("betreff"),
+            description: row.get("description"),
+            room: row.get("room"),
+            status: row.get("status"),
+            date: row.get("date"),
+            user_id: row.get("user_id"),
+            user_first_name: row.get("first_name"),
+            user_last_name: row.get("last_name"),
+        })
+        .collect();
 
     let json_response = serde_json::json!(ticket_response);
     Ok(Json(json_response))
 }
 
+/// Retrieves a specific ticket by ID.
+///
+/// Includes full ticket details and denormalized user information (creator name).
+/// Returns a [`TicketResponse`] with all metadata by joining with [`User`](crate::models::User) table.
+///
+/// # Arguments
+/// - `Path(id)`: Ticket ID to retrieve, extracted from URL path
+/// - `State(data)`: Application state containing [`AppState`] for database access
+///
+/// # Returns
+/// - `200 OK` with [`TicketResponse`] object
+/// - `404 Not Found` if ticket doesn't exist
+/// - `500 Internal Server Error` if database error occurs
+///
+/// # Example Response
+/// ```json
+/// {
+///   "id": 1,
+///   "category": "maintenance",
+///   "betreff": "Broken light in room 101",
+///   "description": "The ceiling light is not working",
+///   "room": 101,
+///   "status": "open",
+///   "date": "2024-01-15T10:30:00Z",
+///   "user_id": 5,
+///   "user_first_name": "John",
+///   "user_last_name": "Doe"
+/// }
+/// ```
 pub async fn get_ticket_by_id(
     Path(id): Path<i32>,
     State(data): State<Arc<AppState>>,
 ) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
-    let query = sqlx::query_as::<_, Ticket>(r#"SELECT * FROM tickets WHERE id = $1"#)
-        .bind(id)
-        .fetch_one(&data.db)
-        .await;
+    let query = sqlx::query(
+        r#"SELECT t.id, t.category, t.betreff, t.description, t.room, t.status, t.date, t.user_id, u.first_name, u.last_name
+           FROM tickets t
+           LEFT JOIN users u ON t.user_id = u.id
+           WHERE t.id = $1"#,
+    )
+    .bind(id)
+    .fetch_one(&data.db)
+    .await;
 
     match query {
-        Ok(ticket) => {
-            let ticket_response = serde_json::json!(filter_record(&ticket));
-            return Ok(Json(ticket_response));
+        Ok(row) => {
+            let ticket_response = TicketResponse {
+                id: row.get("id"),
+                category: row.get("category"),
+                betreff: row.get("betreff"),
+                description: row.get("description"),
+                room: row.get("room"),
+                status: row.get("status"),
+                date: row.get("date"),
+                user_id: row.get("user_id"),
+                user_first_name: row.get("first_name"),
+                user_last_name: row.get("last_name"),
+            };
+            let response = serde_json::json!(ticket_response);
+            return Ok(Json(response));
         }
         Err(sqlx::Error::RowNotFound) => {
             let error_response = serde_json::json!({
@@ -120,11 +248,31 @@ pub async fn get_ticket_by_id(
     };
 }
 
+/// Updates a ticket's status.
+///
+/// Only admins can update ticket status (enforced by middleware). Applies [`TicketUpdateScheme`] to modify the [`TicketResponse`].
+/// This is typically used to transition tickets through their lifecycle (open → in_progress → resolved → archived).
+///
+/// # Arguments
+/// - `Path(id)`: Ticket ID to update, extracted from URL path
+/// - `State(data)`: Application state containing [`AppState`] for database access
+/// - `Json(body)`: [`TicketUpdateScheme`] update payload containing new status
+///
+/// # Returns
+/// - `200 OK` with updated [`TicketResponse`]
+/// - `500 Internal Server Error` if ticket not found or database error
+///
+/// # Typical Status Flow
+/// - `open`: Initial state, waiting for action
+/// - `in_progress`: Currently being worked on
+/// - `resolved`: Issue fixed
+/// - `archived`: Closed/hidden from normal view
 pub async fn edit_ticket(
     Path(id): Path<i32>,
     State(data): State<Arc<AppState>>,
     Json(body): Json<TicketUpdateScheme>,
 ) -> Result<impl IntoResponse, (StatusCode, Json<serde_json::Value>)> {
+    // Update the ticket status
     let update_result = sqlx::query(r#"UPDATE tickets SET status = $1 WHERE id = $2"#)
         .bind(body.status.to_owned())
         .bind(id)
@@ -145,34 +293,40 @@ pub async fn edit_ticket(
         return Err((StatusCode::INTERNAL_SERVER_ERROR, Json(error_response)));
     }
 
-    let updated_ticket = sqlx::query_as::<_, Ticket>(r#"SELECT * FROM tickets WHERE id = $1"#)
-        .bind(id)
-        .fetch_one(&data.db)
-        .await
-        .map_err(|e| {
-            (
-                StatusCode::INTERNAL_SERVER_ERROR,
-                Json(json!({"status": "error", "message": format!("{:?}", e)})),
-            )
-        })?;
+    // Fetch and return the updated ticket
+    let updated_ticket = sqlx::query(
+        r#"SELECT t.id, t.category, t.betreff, t.description, t.room, t.status, t.date, t.user_id, u.first_name, u.last_name
+           FROM tickets t
+           LEFT JOIN users u ON t.user_id = u.id
+           WHERE t.id = $1"#,
+    )
+    .bind(id)
+    .fetch_one(&data.db)
+    .await
+    .map_err(|e| {
+        (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(json!({"status": "error", "message": format!("{:?}", e)})),
+        )
+    })?;
 
-    let ticket_response = serde_json::json!({
-        "ticket": filter_record(&updated_ticket),
+    let ticket_response = TicketResponse {
+        id: updated_ticket.get("id"),
+        category: updated_ticket.get("category"),
+        betreff: updated_ticket.get("betreff"),
+        description: updated_ticket.get("description"),
+        room: updated_ticket.get("room"),
+        status: updated_ticket.get("status"),
+        date: updated_ticket.get("date"),
+        user_id: updated_ticket.get("user_id"),
+        user_first_name: updated_ticket.get("first_name"),
+        user_last_name: updated_ticket.get("last_name"),
+    };
+
+    let response = serde_json::json!({
+        "ticket": ticket_response,
         "status": "success"
     });
 
-    Ok(Json(ticket_response))
-}
-
-fn filter_record(ticket: &Ticket) -> TicketResponse {
-    TicketResponse {
-        id: ticket.id.to_owned(),
-        category: ticket.category.to_owned(),
-        betreff: ticket.betreff.to_owned(),
-        description: ticket.description.to_owned(),
-        room: ticket.room.to_owned(),
-        status: ticket.status.to_owned(),
-        date: ticket.date.to_owned(),
-        user_id: ticket.user_id.to_owned(),
-    }
+    Ok(Json(response))
 }

backend/src/main.rs

@@ -1,30 +1,71 @@
-#![allow(unused_imports)]
+/// Cookie and JWT authentication utilities
 mod cookie;
+/// Environment configuration loading
 mod env;
+/// HTTP request handlers for all endpoints
 mod handlers;
+/// Data structures for request/response serialization
 mod models;
+/// Axum router configuration with all routes and middleware
 mod router;
+
 use std::sync::Arc;
 
-use axum::{Router, routing};
+use axum::http::{
+    HeaderValue, Method,
+    header::{ACCEPT, AUTHORIZATION, CONTENT_TYPE},
+};
 use dotenv::dotenv;
-use models::*;
 use router::create_router;
-use serde::{Deserialize, Serialize};
 use sqlx::{PgPool, postgres::PgPoolOptions};
+use tower_http::cors::CorsLayer;
 
 use crate::env::Env;
 
+/// Shared application state passed to all route handlers.
+///
+/// Contains the database connection pool and environment configuration.
+/// This is wrapped in Arc for thread-safe sharing across async tasks and cloned into each route
+/// via `with_state`.
+///
+/// # Fields
+/// - `db`: PostgreSQL connection pool for database access (via `sqlx::PgPool`)
+/// - `env`: [`Env`] configuration loaded from environment variables
 pub struct AppState {
-    db: PgPool,
-    env: Env,
+    /// PostgreSQL connection pool for all database operations
+    pub db: PgPool,
+    /// Environment configuration with secrets and settings
+    pub env: Env,
 }
 
+/// Main application entry point.
+///
+/// Initializes the server by:
+/// 1. Loading environment variables from `.env` file
+/// 2. Establishing database connection pool to PostgreSQL
+/// 3. Configuring CORS policy for cross-origin requests
+/// 4. Creating the router with [`create_router`] containing all endpoints
+/// 5. Starting HTTP server on port 8001
+///
+/// # Server Configuration
+/// - Binds to `0.0.0.0:8001` (all network interfaces)
+/// - Allows: GET, POST, PATCH, DELETE methods
+/// - Allows credentials and custom headers
+/// - CORS origin configured from [`Env`]
+///
+/// # State Setup
+/// Creates shared [`AppState`] wrapped in `Arc` and passes to all routes
+///
+/// # Panics
+/// - If environment loading fails
+/// - If database connection fails
 #[tokio::main]
 async fn main() {
     dotenv().ok();
     let env = Env::load();
-    let database_url = std::env::var("DATABASE_URL").expect("DATABASE_URL variable not set");
+    let database_url = &env.db_url;
+
+    // Establish connection pool to PostgreSQL
     let pool = match PgPoolOptions::new().connect(&database_url).await {
         Ok(pool) => {
             println!("Database connection successful");
@@ -35,10 +76,30 @@ async fn main() {
             std::process::exit(1);
         }
     };
+
+    // Run database migrations on container/application startup
+    println!("Running database migrations...");
+    if let Err(err) = sqlx::migrate!("./migrations").run(&pool).await {
+        println!("Failed to run database migrations: {:?}", err);
+        std::process::exit(1);
+    }
+    println!("Database migrations completed successfully");
+
+    // Configure CORS to allow requests from frontend
+    let cors = CorsLayer::new()
+        .allow_origin(env.origin.parse::<HeaderValue>().unwrap())
+        .allow_methods([Method::GET, Method::POST, Method::PATCH, Method::DELETE])
+        .allow_credentials(true)
+        .allow_headers([AUTHORIZATION, ACCEPT, CONTENT_TYPE]);
+
+    // Build router with all endpoints and apply CORS middleware
     let app = create_router(Arc::new(AppState {
         db: pool.clone(),
         env: env.clone(),
-    }));
+    }))
+    .layer(cors);
+
+    // Start listening for incoming connections
     let listener = tokio::net::TcpListener::bind("0.0.0.0:8001").await.unwrap();
-    axum::serve(listener, app).await;
+    let _ = axum::serve(listener, app).await;
 }

backend/src/models.rs

@@ -1,89 +1,233 @@
-use std::fmt::Display;
-
 use serde::{Deserialize, Serialize};
-use sqlx::{Decode, prelude::Type};
-
-#[derive(Deserialize, Serialize, PartialEq, Debug, sqlx::FromRow)]
-pub struct Ticket {
-    pub id: i32,
-    pub category: String,
-    pub betreff: String,
-    pub description: String,
-    pub room: i16,
-    pub status: String,
-    pub date: chrono::NaiveDateTime,
-    pub user_id: i16,
-}
 
+/// API response for a ticket with user information.
+///
+/// Returned by ticket endpoints. Includes denormalized user data for easier frontend rendering.
+/// Created via [`TicketCreateScheme`].
+///
+/// # Fields
+/// - `id`: Unique ticket identifier
+/// - `category`: Ticket category/type
+/// - `betreff`: Ticket subject line
+/// - `description`: Detailed ticket description
+/// - `room`: Room number associated with the issue
+/// - `status`: Current ticket status (e.g., "open", "in_progress", "resolved")
+/// - `date`: When the ticket was created (UTC timestamp)
+/// - `user_id`: ID of the user who created the ticket (references [`User`])
+/// - `user_first_name`, `user_last_name`: User's name (denormalized for convenience)
+///
+/// # Example
+/// ```json
+/// {
+///   "id": 1,
+///   "category": "maintenance",
+///   "betreff": "Broken light in room 101",
+///   "description": "The ceiling light is not working",
+///   "room": 101,
+///   "status": "open",
+///   "date": "2024-01-15T10:30:00Z",
+///   "user_id": 5,
+///   "user_first_name": "John",
+///   "user_last_name": "Doe"
+/// }
+/// ```
 #[derive(Deserialize, Serialize, Debug, PartialEq)]
 pub struct TicketResponse {
+    /// Unique ticket identifier
     pub id: i32,
+    /// Ticket category/type (e.g., "maintenance", "support")
     pub category: String,
+    /// Ticket subject line
     pub betreff: String,
+    /// Detailed ticket description
     pub description: String,
+    /// Room number associated with the issue
     pub room: i16,
+    /// Current ticket status (e.g., "open", "in_progress", "resolved", "archived")
     pub status: String,
-    pub date: chrono::NaiveDateTime,
+    /// When the ticket was created (UTC timestamp)
+    pub date: chrono::DateTime<chrono::Utc>,
+    /// ID of the user who created the ticket
     pub user_id: i16,
+    /// First name of the ticket creator (denormalized from `User`)
+    pub user_first_name: String,
+    /// Last name of the ticket creator (denormalized from `User`)
+    pub user_last_name: String,
 }
 
-#[derive(Deserialize, Serialize, PartialEq, Debug)]
+/// Complete user record from the database.
+///
+/// Contains all user information including the password hash.
+/// This should NEVER be sent directly to clients - always use [`FilteredUser`] instead.
+///
+/// # Fields
+/// - `id`: Unique user identifier
+/// - `first_name`, `last_name`: User's full name
+/// - `username`: Login username (must be unique)
+/// - `is_admin`: Whether user has admin privileges
+/// - `pwd`: Argon2 password hash (NEVER expose to clients)
+///
+/// # Security Note
+/// The `pwd` field contains the password hash and should never be included in API responses.
+/// Use [`filter_user()`](`crate::handlers::auth::filter_user`) to convert to [`FilteredUser`] for responses.
+#[derive(Deserialize, Serialize, PartialEq, Debug, Clone, sqlx::FromRow)]
 pub struct User {
+    /// Unique user identifier
     pub id: i16,
+    /// User's last name
     pub last_name: String,
+    /// User's first name
     pub first_name: String,
+    /// Unique login username (must be unique in the database)
+    pub username: String,
+    /// Whether this user has administrator privileges
     pub is_admin: bool,
+    /// Argon2 password hash (NEVER expose to clients)
     pub pwd: String,
 }
 
+/// Payload for creating a new ticket.
+///
+/// Sent to `/api/tickets/create`. The backend automatically associates it with the
+/// authenticated user and sets the creation timestamp. Converted to [`TicketResponse`] for the response.
+///
+/// # Fields
+/// - `category`: Ticket category/type
+/// - `betreff`: Subject line for the ticket
+/// - `description`: Detailed problem description
+/// - `room`: Room number where the issue is located
 #[derive(Deserialize, Serialize, Debug)]
 pub struct TicketCreateScheme {
+    /// Ticket category/type
     pub category: String,
+    /// Subject line for the ticket
     pub betreff: String,
+    /// Detailed problem description
     pub description: String,
+    /// Room number where the issue is located
     pub room: i16,
 }
 
+/// Payload for updating a ticket.
+///
+/// Sent to `PATCH /api/tickets/{id}`. Allows updating the ticket [`TicketResponse::status`].
+/// Only admins can update tickets.
+///
+/// # Fields
+/// - `status`: New ticket status (e.g., "open", "in_progress", "resolved")
 #[derive(Deserialize, Serialize, Debug)]
 pub struct TicketUpdateScheme {
+    /// New ticket status (e.g., "open", "in_progress", "resolved", "archived")
     pub status: String,
 }
 
+/// Payload for updating user information.
+///
+/// Sent to `PATCH /api/users/{id}`. Allows updating profile and admin status.
+/// Only admins can update [`User`] records. Empty password field means no password change.
+///
+/// # Fields
+/// - `id`: [`User`] ID to update
+/// - `first_name`, `last_name`: Updated user name
+/// - `username`: Updated login username
+/// - `make_admin`: New admin privilege status
+/// - `new_pwd`: New password (empty string = keep existing password)
+#[derive(Deserialize, Serialize, Debug)]
+pub struct UserUpdateScheme {
+    /// User ID to update
+    pub id: i16,
+    /// Updated user first name
+    pub first_name: String,
+    /// Updated user last name
+    pub last_name: String,
+    /// Updated login username
+    pub username: String,
+    /// New admin privilege status
+    pub make_admin: bool,
+    /// New password (empty string = keep existing password)
+    pub new_pwd: String,
+}
+
+/// Payload for creating a new user account.
+///
+/// Used in both admin registration (`/api/register`) and initial setup (`/api/setup-admin`).
+/// The password is hashed server-side before storage using Argon2. Converted to [`User`] for storage.
+///
+/// # Fields
+/// - `first_name`: User's first name
+/// - `last_name`: User's last name
+/// - `username`: Unique username for login
+/// - `is_admin`: Whether to grant admin privileges (setup endpoint always sets this to true)
+/// - `pwd`: Plain text password (hashed on server)
 #[derive(Deserialize, Serialize, Debug, sqlx::FromRow)]
 pub struct UserCreateScheme {
+    /// User's first name
     pub first_name: String,
+    /// User's last name
     pub last_name: String,
+    /// Unique username for login
     pub username: String,
+    /// Whether to grant admin privileges
     pub is_admin: bool,
+    /// Plain text password (hashed on server before storage)
     pub pwd: String,
 }
 
+/// Payload for user login.
+///
+/// Sent to `/api/login` endpoint with credentials. The backend verifies the password
+/// against the stored Argon2 hash.
+///
+/// # Security
+/// The password is never stored in plain text - only the Argon2 hash is persisted.
 #[derive(Deserialize, Serialize, Debug)]
 pub struct LoginScheme {
+    /// Username for login
     pub username: String,
+    /// Plain text password (verified against stored Argon2 hash)
     pub pwd: String,
 }
 
-#[derive(Deserialize, Serialize, Debug, sqlx::FromRow)]
-pub struct LoginModel {
-    pub id: i16,
-    pub last_name: String,
-    pub first_name: String,
-    pub is_admin: bool,
-    pub pwd: String,
-}
-
-#[derive(Debug, Serialize)]
+/// User information sent to clients, excluding password hashes.
+///
+/// This is the safe version of [`User`] data that gets returned in API responses.
+/// It never includes the password hash or JWT claims. Always use this for responses
+/// to prevent leaking sensitive data.
+#[derive(Debug, Clone, Serialize)]
 pub struct FilteredUser {
+    /// Unique user identifier
     pub id: i16,
+    /// User's first name
     pub first_name: String,
+    /// User's last name
     pub last_name: String,
+    /// Login username
+    pub username: String,
+    /// Whether user has admin privileges
     pub is_admin: bool,
 }
 
+/// JWT token claims embedded in the session token.
+///
+/// Contains user identification and token validity information.
+/// Generated during login via `encode_token` and verified via `decode_token`.
+///
+/// # Fields
+/// - `sub`: Subject - the user ID as a string (references [`User`])
+/// - `issued`: Unix timestamp when token was created
+/// - `expires`: Unix timestamp when token expires (currently 1 hour from creation)
+///
+/// # Token Lifetime
+/// Tokens are valid for 1 hour. After expiration, user must log in again.
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Claims {
-    pub subject: String,
+    /// Subject - typically the user ID
+    #[serde(alias = "subject")]
+    pub sub: String,
+    /// Issued at time (Unix timestamp)
+    #[serde(rename = "iat", alias = "issued", default)]
     pub issued: usize,
+    /// Expiration time (Unix timestamp)
+    #[serde(rename = "exp", alias = "expires", default)]
     pub expires: usize,
 }

backend/src/router.rs

@@ -2,21 +2,67 @@ use std::sync::Arc;
 
 use axum::{
     Router,
+    http::StatusCode,
+    middleware,
+    response::IntoResponse,
     routing::{get, post},
 };
 
 use crate::{
     AppState,
+    cookie::validation::{validate_admin, validate_token},
     handlers::{
-        auth::{create_user, login, logout},
+        auth::{
+            check_admin_exists, create_user, delete_user, get_current_user, get_user_by_id,
+            get_users, login, logout, setup_initial_admin, update_user,
+        },
+        qr::{generate_qr_token, validate_qr_token},
         ticket::{create_ticket, delete_ticket, edit_ticket, get_ticket_by_id, get_tickets},
     },
 };
 
+async fn debug_fallback_handler(uri: axum::http::Uri) -> impl IntoResponse {
+    println!(
+        "[BACKEND DEBUG] Axum Fallback triggered! Unmatched request path: {}",
+        uri
+    );
+    (StatusCode::NOT_FOUND, "Backend route not found")
+}
+
+/// Creates the complete router with all API endpoints.
+///
+/// The router is organized in layers for proper middleware application. Uses [`AppState`]
+/// for shared application context across all routes.
+///
+/// ## Route Layers (from most to least restricted):
+///
+/// ### Admin-Only Routes (requires admin privilege + valid token)
+/// - `GET /api/tickets/{id}` - Get specific ticket details (via `get_ticket_by_id`)
+/// - `DELETE /api/tickets/{id}` - Delete a ticket (via `delete_ticket`)
+/// - `PATCH /api/tickets/{id}` - Update ticket status (via `edit_ticket`)
+/// - `POST /api/register` - Create a new user (via `create_user`)
+/// - `GET /api/users` - List all users (via `get_users`)
+/// - `GET /api/users/{id}` - Get user details (via `get_user_by_id`)
+/// - `DELETE /api/users/{id}` - Delete a user (via `delete_user`)
+/// - `PATCH /api/users/{id}` - Update user details (via `update_user`)
+///
+/// ### Protected Routes (requires valid token)
+/// - `GET /api/tickets` - List all tickets (via `get_tickets`)
+/// - `POST /api/tickets/create` - Create a new ticket (via `create_ticket`)
+/// - `GET /api/logout` - Logout user (via `logout`)
+/// - `GET /api/users/current` - Get current authenticated user (via `get_current_user`)
+///
+/// ### Public Routes (no authentication required)
+/// - `POST /api/login` - User login (via `login`)
+/// - `GET /api/check-admin` - Check if admin exists (via `check_admin_exists`)
+/// - `POST /api/setup-admin` - Create initial admin account (via `setup_initial_admin`)
+///
+/// # Middleware Stack
+/// - Admin routes have `validate_admin` middleware
+/// - Protected routes have `validate_token` middleware
+/// - Public routes have no authentication requirements
 pub fn create_router(state: Arc<AppState>) -> Router {
-    Router::new()
-        .route("/api/tickets", get(get_tickets))
-        .route("/api/tickets/create", post(create_ticket))
+    let admin_routes = Router::new()
         .route(
             "/api/tickets/{id}",
             get(get_ticket_by_id)
@@ -24,7 +70,37 @@ pub fn create_router(state: Arc<AppState>) -> Router {
                 .patch(edit_ticket),
         )
         .route("/api/register", post(create_user))
-        .route("/api/login", post(login))
+        .route("/api/users", get(get_users))
+        .route(
+            "/api/users/{id}",
+            get(get_user_by_id).delete(delete_user).patch(update_user),
+        )
+        .route("/api/generate_qr", post(generate_qr_token))
+        .layer(middleware::from_fn_with_state(
+            state.clone(),
+            validate_admin,
+        ));
+
+    let protected_routes = Router::new()
+        .merge(admin_routes)
+        .route("/api/tickets", get(get_tickets))
+        .route("/api/tickets/create", post(create_ticket))
         .route("/api/logout", get(logout))
+        .route("/api/users/current", get(get_current_user))
+        .layer(middleware::from_fn_with_state(
+            state.clone(),
+            validate_token,
+        ));
+
+    let public_routes = Router::new()
+        .route("/api/login", post(login))
+        .route("/api/check-admin", get(check_admin_exists))
+        .route("/api/setup-admin", post(setup_initial_admin))
+        .route("/api/qr_login", get(validate_qr_token));
+
+    Router::new()
+        .merge(protected_routes)
+        .merge(public_routes)
+        .fallback(debug_fallback_handler)
         .with_state(state)
 }

docker/Dockerfile

@@ -0,0 +1,127 @@
+# ============================================================
+# Dockerfile — Full application (frontend + backend)
+# ============================================================
+# Multi-stage build:
+#   1. chef     – install cargo-chef for dependency caching
+#   2. planner  – generate recipe.json from the workspace
+#   3. backend  – build the backend binary (release)
+#   4. frontend – build the frontend WASM bundle with Trunk
+#   5. runtime  – minimal image: backend binary + static frontend + nginx
+# ============================================================
+
+# --------------- Stage 1: Chef base ---------------
+FROM rust:1-bookworm AS chef
+RUN cargo install cargo-chef
+WORKDIR /app
+
+# --------------- Stage 2: Planner ---------------
+FROM chef AS planner
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+COPY backend/ backend/
+COPY frontend/ frontend/
+RUN cargo chef prepare --recipe-path recipe.json
+
+# --------------- Stage 3: Backend builder ---------------
+FROM chef AS backend-builder
+
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json -p backend
+
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+COPY backend/ backend/
+COPY frontend/ frontend/
+RUN cargo build --release -p backend
+
+# --------------- Stage 4: Frontend builder ---------------
+FROM chef AS frontend-builder
+
+# Add the WASM target
+RUN rustup target add wasm32-unknown-unknown
+
+# Install Trunk (the WASM bundler used by the frontend) and sass (for SCSS)
+RUN cargo install trunk
+
+# Cache frontend dependencies
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --target wasm32-unknown-unknown --recipe-path recipe.json -p frontend
+
+# Copy full workspace source for the build
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+COPY backend/ backend/
+COPY frontend/ frontend/
+
+# Build the frontend WASM bundle
+# Trunk outputs to frontend/dist by default
+WORKDIR /app/frontend
+RUN trunk build --release
+
+# --------------- Stage 5: Runtime ---------------
+FROM debian:bookworm-slim AS runtime
+
+# Install runtime dependencies:
+#   - ca-certificates & libssl3: TLS for PostgreSQL connections
+#   - nginx: serves the frontend static files and reverse-proxies /api to the backend
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates libssl3 nginx && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy the compiled backend binary
+COPY --from=backend-builder /app/target/release/backend /app/backend
+
+# Copy migrations
+COPY backend/migrations/ /app/migrations/
+
+# Copy the frontend static build output
+COPY --from=frontend-builder /app/frontend/dist /var/www/html
+
+# Nginx configuration: serve frontend + reverse-proxy /api to the backend
+RUN cat > /etc/nginx/sites-available/default <<'EOF'
+server {
+    listen 80;
+    server_name _;
+
+    root /var/www/html;
+    index index.html;
+
+    # Serve static frontend files, fall back to index.html for client-side routing
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Reverse-proxy API requests to the Axum backend
+    location /api/ {
+        proxy_pass http://127.0.0.1:8001;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}
+EOF
+
+# Startup script: launch backend in the background, then nginx in the foreground
+RUN cat > /app/start.sh <<'SCRIPT'
+#!/bin/bash
+set -e
+
+# Start the backend API server in the background
+/app/backend &
+
+# Start nginx in the foreground (keeps the container alive)
+nginx -g 'daemon off;'
+SCRIPT
+RUN chmod +x /app/start.sh
+
+EXPOSE 80
+
+# Environment variables should be provided at runtime:
+#   DATABASE_URL    – PostgreSQL connection string
+#   TOKEN_SECRET    – JWT signing key
+#   ORIGIN          – Allowed CORS origin (should be the public URL of this container)
+
+CMD ["/app/start.sh"]

docker/Dockerfile.backend

@@ -0,0 +1,66 @@
+# ============================================================
+# Dockerfile.backend — Backend only
+# ============================================================
+# Multi-stage build:
+#   1. chef    – install cargo-chef for dependency caching
+#   2. planner – generate a recipe.json from the workspace
+#   3. builder – build dependencies first (cached), then the backend binary
+#   4. runtime – minimal image with just the compiled binary
+# ============================================================
+
+# --------------- Stage 1: Chef base ---------------
+FROM rust:1-bookworm AS chef
+RUN cargo install cargo-chef
+WORKDIR /app
+
+# --------------- Stage 2: Planner ---------------
+FROM chef AS planner
+# Copy the full workspace so cargo-chef can resolve all dependencies
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+COPY backend/ backend/
+COPY frontend/ frontend/
+RUN cargo chef prepare --recipe-path recipe.json
+
+# --------------- Stage 3: Builder ---------------
+FROM chef AS builder
+
+# Cache dependency compilation in its own layer
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json -p backend
+
+# Now copy the real source and build
+COPY Cargo.toml Cargo.lock ./
+COPY src/ src/
+COPY backend/ backend/
+COPY frontend/ frontend/
+RUN cargo build --release -p backend
+
+# --------------- Stage 4: Runtime ---------------
+FROM debian:bookworm-slim AS runtime
+
+# Install TLS root certificates and PostgreSQL client libs (needed by sqlx
+# at runtime for TLS connections via native-tls)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates libssl3 && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy the compiled binary
+COPY --from=builder /app/target/release/backend /app/backend
+
+# Copy migrations so they can be run at startup if needed
+COPY backend/migrations/ /app/migrations/
+
+EXPOSE 8001
+
+# Environment variables should be provided at runtime via docker run --env
+# or docker compose environment/env_file.
+#
+# Required:
+#   DATABASE_URL    – PostgreSQL connection string
+#   TOKEN_SECRET    – JWT signing key
+#   ORIGIN          – Allowed CORS origin (frontend URL)
+
+CMD ["/app/backend"]

docker/compose.yaml

@@ -0,0 +1,58 @@
+services:
+  postgres:
+    image: postgres:latest
+    container_name: postgres_ticket
+    restart: unless-stopped
+    ports:
+      - 5432:5432
+    environment:
+      POSTGRES_PASSWORD: tickets
+      POSTGRES_DB: system_data
+    volumes:
+      - pg_data:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  # Full application (frontend + backend + nginx)
+  # Usage: docker compose --profile full up --build
+  app:
+    profiles: ["full"]
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    container_name: ticketsystem
+    restart: unless-stopped
+    ports:
+      - 8080:80
+    environment:
+      DATABASE_URL: postgres://postgres:tickets@postgres:5432/system_data
+      TOKEN_SECRET: 160257c8c5ff2298363529e963a5901d2efa6d6ae67d634487c4d2bbc41c533f
+      ORIGIN: http://localhost:8080
+    depends_on:
+      postgres:
+        condition: service_healthy
+
+  # Backend only (API server)
+  # Usage: docker compose --profile backend up --build
+  backend:
+    profiles: ["backend"]
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.backend
+    container_name: ticketsystem-backend
+    restart: unless-stopped
+    ports:
+      - 8001:8001
+    environment:
+      DATABASE_URL: postgres://postgres:tickets@postgres:5432/system_data
+      TOKEN_SECRET: 160257c8c5ff2298363529e963a5901d2efa6d6ae67d634487c4d2bbc41c533f
+      ORIGIN: http://localhost:8000
+    depends_on:
+      postgres:
+        condition: service_healthy
+
+volumes:
+  pg_data:

frontend/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "frontend"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[[bin]]
+name = "bin"
+path = "src/main.rs"
+
+[dependencies]
+yew = { version = "0.23", features = ["csr"] }
+serde = { workspace = true }
+wasm-bindgen-futures = "0.4.70"
+web-sys = { version = "0.3.95", features = [
+  "Window","Document","Request","Response","Headers", "HtmlSelectElement", "RequestCredentials",
+  "SubmitEvent","InputEvent","HtmlInputElement","Event", "HtmlFormElement", "MouseEvent"
+] }
+gloo-net = "0.7.0"
+gloo-storage = "0.4.0"
+yew-router = "0.20.0"
+serde_json = { workspace = true }
+gloo = "0.12.0"
+chrono = { workspace = true }
+chrono-tz = "0.10.4"
+wasm-bindgen = "0.2.120"
+theme = { version = "0.0.3", features = ["yew"] }
+qrcode-generator = "5.0.0"
+base64 = '0.22'
+dotenv = '0.15.0'

frontend/Trunk.toml

@@ -0,0 +1,10 @@
+[serve]
+# The address to serve on LAN.
+addresses = ["127.0.0.1"] #,"10.150.9.7"]
+# The address to serve on WAN.
+# address = "0.0.0.0"
+# The port to serve on.
+port = 8000
+
+[[proxy]]
+backend = "http://localhost:8001/api"

frontend/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+
+<head>
+    <link data-trunk rel="rust" data-bin="bin" />
+    <link data-trunk rel="scss" href="src/styles/main.scss" />
+    <link data-trunk rel="icon" href="src/assets/favicon.ico" type="image/x-icon" />
+    <link data-trunk rel="copy-dir" href="src/assets" data-target-path="assets" />
+    <meta charset="utf-8" />
+    <title>Yew App</title>
+</head>
+
+<body></body>
+
+</html>

frontend/src/auth.rs

@@ -0,0 +1,136 @@
+use gloo_net::http::Request;
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// Represents the authentication state of the current user.
+///
+/// This struct holds information about whether a user is authenticated and if they
+/// possess administrator privileges.
+///
+/// # Fields
+/// - `is_authenticated`: An `Option<bool>` indicating if the user is logged in.
+///   `None` means the status is still being checked.
+/// - `is_admin`: An `Option<bool>` indicating if the authenticated user is an administrator.
+///   `None` means the admin status is still being checked or is not applicable.
+#[derive(Clone, Debug, PartialEq)]
+pub struct AuthState {
+    pub is_authenticated: Option<bool>,
+    pub is_admin: Option<bool>,
+}
+
+/// Properties for the [`ProtectedRoute`] component.
+///
+/// # Fields
+/// - `children`: The child components that this protected route will render if access is granted.
+/// - `admin_page`: A boolean flag indicating whether this route requires administrator privileges.
+///   If `true`, the user must be authenticated AND be an administrator to access the `children`.
+#[derive(Properties, PartialEq)]
+pub struct ProtectedRouteProps {
+    pub children: Children,
+    pub admin_page: bool,
+}
+
+/// A component that protects routes by enforcing authentication and optional administrator privileges.
+///
+/// This component uses the backend's validation middleware by fetching the current user's authentication
+/// and admin status from the `/api/users/current` endpoint (which requires a valid JWT token).
+/// Based on the [`AuthState`] and the `admin_page` property, it either renders its children or redirects the user.
+///
+/// # Behavior
+/// - **Initial Load**: Displays "Loading..." while checking authentication status via the backend.
+/// - **Not Authenticated**: Redirects to the login page (`crate::Route::Login`).
+/// - **Authenticated** (valid JWT token from backend):
+///   - If `admin_page` is `true`:
+///     - If the user is an administrator (`is_admin: Some(true)`), it renders `children`.
+///     - If the user is not an administrator (`is_admin: Some(false)`), it redirects to
+///       the permission denied page (`crate::Route::PermissionDenied`).
+///     - If admin status is still being checked (`is_admin: None`), it displays "Checking permissions...".
+///   - If `admin_page` is `false`: It renders `children` directly, as only authentication is required.
+///
+/// # Example Usage
+/// ```ignore
+/// html! {
+///     <ProtectedRoute admin_page={true}>
+///         <AdminDashboard />
+///     </ProtectedRoute>
+/// }
+/// ```
+#[component(ProtectedRoute)]
+pub fn protected_route(props: &ProtectedRouteProps) -> Html {
+    let auth_state = use_state(|| AuthState {
+        is_authenticated: None,
+        is_admin: None,
+    });
+
+    {
+        let auth_state = auth_state.clone();
+        use_effect_with((), move |_| {
+            let auth_state = auth_state.clone();
+            spawn_local(async move {
+                match Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await
+                {
+                    Ok(resp) => {
+                        let status = resp.status();
+                        web_sys::console::log_1(&format!("Auth check: status {}", status).into());
+                        if status == 200 {
+                            let user_data: serde_json::Value =
+                                resp.json().await.unwrap_or_default();
+                            let is_admin = user_data["data"]["is_admin"].as_bool();
+
+                            auth_state.set(AuthState {
+                                is_authenticated: Some(true),
+                                is_admin,
+                            });
+                        } else {
+                            auth_state.set(AuthState {
+                                is_authenticated: Some(false),
+                                is_admin: Some(false),
+                            });
+                        }
+                    }
+                    Err(err) => {
+                        web_sys::console::log_1(&format!("Auth check error: {:?}", err).into());
+                        auth_state.set(AuthState {
+                            is_authenticated: Some(false),
+                            is_admin: Some(false),
+                        });
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    match *auth_state {
+        AuthState {
+            is_authenticated: None,
+            ..
+        } => html! { <div>{ "Wird geladen..." } </div> },
+        AuthState {
+            is_authenticated: Some(false),
+            ..
+        } => html! {
+            <Redirect<crate::Route> to={crate::Route::Login}/>
+        },
+        AuthState {
+            is_authenticated: Some(true),
+            is_admin: admin_flag,
+        } => {
+            if props.admin_page {
+                match admin_flag {
+                    Some(true) => props.children.clone().into(),
+                    Some(false) => {
+                        html! { <Redirect<crate::Route> to={crate::Route::PermissionDenied}/> }
+                    }
+                    None => html! { <div>{ "Überprüfe Berechtigungen..." }</div> },
+                }
+            } else {
+                props.children.clone().into()
+            }
+        }
+    }
+}

frontend/src/darkmode.rs

@@ -0,0 +1,78 @@
+use yew::prelude::*;
+
+/// A button component that toggles between light and dark theme modes.
+///
+/// Clicking this button switches the application's theme by modifying the `data-theme` attribute
+/// on the document element. The theme preference is applied via CSS variables for consistent styling.
+///
+/// # Behavior
+/// - Reads the current `data-theme` attribute value from the HTML element
+/// - Sets `data-theme="dark"` if currently in light mode
+/// - Clears the attribute (light mode) if currently in dark mode
+/// - Re-renders to reflect the visual changes (typically toggled via CSS)
+///
+/// # Example Usage
+/// ```ignore
+/// html! {
+///     <ThemeToggle />
+/// }
+/// ```
+#[function_component]
+pub fn ThemeToggle() -> Html {
+    let is_dark = use_state(|| {
+        if let Some(window) = web_sys::window() {
+            if let Some(document) = window.document() {
+                if let Some(html) = document.document_element() {
+                    return html.get_attribute("data-theme").unwrap_or_default() == "dark";
+                }
+            }
+        }
+        false
+    });
+
+    let onclick = {
+        let is_dark = is_dark.clone();
+        Callback::from(move |_| {
+            if let Some(window) = web_sys::window() {
+                if let Some(document) = window.document() {
+                    if let Some(html) = document.document_element() {
+                        let current = html.get_attribute("data-theme").unwrap_or_default();
+                        let new_theme = if current == "dark" { "" } else { "dark" };
+                        let _ = html.set_attribute("data-theme", new_theme);
+                        is_dark.set(new_theme == "dark");
+                    }
+                }
+            }
+        })
+    };
+
+    let icon_html = if *is_dark {
+        // Sun SVG for dark mode
+        html! {
+            <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="theme-icon">
+                <circle cx="12" cy="12" r="4" />
+                <path d="M12 2v2" />
+                <path d="M12 20v2" />
+                <path d="m4.93 4.93 1.41 1.41" />
+                <path d="m17.66 17.66 1.41 1.41" />
+                <path d="M2 12h2" />
+                <path d="M20 12h2" />
+                <path d="m6.34 17.66-1.41 1.41" />
+                <path d="m19.07 4.93-1.41 1.41" />
+            </svg>
+        }
+    } else {
+        // Moon SVG for light mode
+        html! {
+            <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="theme-icon">
+                <path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z" />
+            </svg>
+        }
+    };
+
+    html! {
+        <button {onclick} class="sidebar-button theme-toggle-btn">
+            {icon_html}
+        </button>
+    }
+}

frontend/src/lib.rs

@@ -0,0 +1,323 @@
+mod auth;
+mod darkmode;
+mod pages;
+use crate::auth::ProtectedRoute;
+use crate::pages::*;
+use gloo_net::http::Request;
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// Defines the application's various routes and their corresponding paths.
+///
+/// This enum is used by `yew-router` to map URLs to specific components,
+/// enabling navigation within the single-page application. Each route is protected
+/// by [`ProtectedRoute`] middleware where appropriate to enforce authentication and authorization.
+/// See [`switch`] for the routing logic.
+#[derive(Clone, PartialEq, Routable)]
+enum Route {
+    /// The application's home page.
+    #[at("/")]
+    Home,
+    /// Route for submitting a new ticket.
+    #[at("/ticket")]
+    Ticket,
+    /// Route for viewing a specific ticket by its ID.
+    #[at("/tickets/:id")]
+    TicketById { id: i32 },
+    /// Route for viewing all tickets.
+    #[at("/tickets")]
+    AllTickets,
+    /// Route for viewing archived tickets.
+    #[at("/tickets/archive")]
+    ArchivedTickets,
+    /// Route for user registration.
+    #[at("/register")]
+    Register,
+    /// Route for user login.
+    #[at("/login")]
+    Login,
+    /// Route for the initial administrator setup.
+    #[at("/setup")]
+    Setup,
+    /// Route for viewing all users.
+    #[at("/users")]
+    AllUsers,
+    /// Route for viewing a specific user by their ID.
+    #[at("/users/:id")]
+    UserByID { id: i16 },
+    /// Route for displaying diagnostics information (admin-only).
+    #[at("/diagnostics")]
+    Diagnostics,
+    /// Route displayed when a user attempts to access a page without sufficient permissions.
+    #[at("/denied")]
+    PermissionDenied,
+    /// Catch-all route for unmatched paths, leading to a 404 Not Found page.
+    #[not_found]
+    #[at("/404")]
+    NotFound,
+}
+
+/// Properties for the [`SidebarShell`] component.
+#[derive(Properties, PartialEq)]
+pub struct SidebarShellProps {
+    /// The child components to be rendered within the main content area of the shell.
+    pub children: Children,
+}
+
+/// A shell component that provides a consistent layout with a sidebar and a main content area.
+///
+/// This component is designed to wrap page-specific content, ensuring that the sidebar
+/// is always present for navigation. Integrates with [`crate::pages::sidebar::Sidebar`] for navigation.
+///
+/// # Mobile Support
+/// On mobile displays, the sidebar is hidden by default and can be toggled:
+/// - **Menu Toggle Button**: Renders a floating menu button to slide the sidebar open.
+/// - **Dark Mode Toggle**: Floating button to change theme.
+/// - **Overlay Backdrop**: Dims the screen when the sidebar is open. Clicking it closes the sidebar.
+/// - **Auto-Close on Navigation**: Automatically closes the sidebar when navigating to a new route.
+///
+/// # Components
+/// - [`crate::pages::sidebar::Sidebar`]: The navigation sidebar component, accepting mobile open state.
+/// - Main content area: Renders the `children` passed to this component.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <SidebarShell>
+///         <p>{"Your page content goes here."}</p>
+///     </SidebarShell>
+/// }
+/// ```
+#[component(SidebarShell)]
+fn sidebar_shell(props: &SidebarShellProps) -> Html {
+    let route = use_route::<Route>();
+    let mobile_sidebar_open = use_state(|| false);
+
+    // Close mobile sidebar automatically on any route transition
+    {
+        let mobile_sidebar_open = mobile_sidebar_open.clone();
+        use_effect_with(route, move |_| {
+            mobile_sidebar_open.set(false);
+            || ()
+        });
+    }
+
+    let on_open = {
+        let mobile_sidebar_open = mobile_sidebar_open.clone();
+        Callback::from(move |_: MouseEvent| mobile_sidebar_open.set(true))
+    };
+
+    let on_close = {
+        let mobile_sidebar_open = mobile_sidebar_open.clone();
+        Callback::from(move |_: ()| mobile_sidebar_open.set(false))
+    };
+
+    let on_close_click = {
+        let on_close = on_close.clone();
+        Callback::from(move |_: MouseEvent| on_close.emit(()))
+    };
+
+    html! {
+        <div class="layout">
+            <button class="mobile-menu-toggle" onclick={on_open}>
+                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <line x1="4" x2="20" y1="12" y2="12"/>
+                    <line x1="4" x2="20" y1="6" y2="6"/>
+                    <line x1="4" x2="20" y1="18" y2="18"/>
+                </svg>
+            </button>
+
+            <div class={if *mobile_sidebar_open { "sidebar-overlay open" } else { "sidebar-overlay" }} onclick={on_close_click}></div>
+
+            <sidebar::Sidebar is_open={*mobile_sidebar_open} on_close={on_close} />
+            <main class="content">
+                { for props.children.iter() }
+            </main>
+        </div>
+    }
+}
+
+/// Props for the AdminCheckWrapper component.
+#[derive(Properties, PartialEq)]
+pub struct AdminCheckWrapperProps {
+    pub children: Children,
+}
+
+/// Wrapper component that checks if an admin exists before rendering children.
+///
+/// This component is used to gate access to pages that should only be accessible before
+/// system initialization (e.g., login page). It performs an asynchronous check to the
+/// backend's `/api/check-admin` endpoint (via `crate::handlers::auth::check_admin_exists`) to determine system state.
+///
+/// # Behavior
+/// - **Loading**: Displays "Loading..." while checking admin status from the backend
+/// - **No Admin**: Automatically redirects to [`Route::Setup`] page for initialization
+/// - **Admin Exists**: Renders the wrapped children (e.g., login page)
+///
+/// # Example Usage
+/// ```ignore
+/// <AdminCheckWrapper>
+///     <LoginPage />
+/// </AdminCheckWrapper>
+/// ```
+///
+/// # Backend Integration
+/// The check queries the backend's `/api/check-admin` endpoint which returns `{"has_admin": bool}`.
+/// This allows the frontend to determine if initial admin setup is required.
+#[component(AdminCheckWrapper)]
+fn admin_check_wrapper(props: &AdminCheckWrapperProps) -> Html {
+    let admin_exists = use_state(|| None::<bool>);
+    let navigator = use_navigator().unwrap();
+
+    {
+        let admin_exists = admin_exists.clone();
+        use_effect_with((), move |_| {
+            let admin_exists = admin_exists.clone();
+            spawn_local(async move {
+                match Request::get("/api/check-admin").send().await {
+                    Ok(resp) if resp.status() == 200 => {
+                        if let Ok(data) = resp.json::<serde_json::Value>().await {
+                            let has_admin = data["has_admin"].as_bool().unwrap_or(false);
+                            admin_exists.set(Some(has_admin));
+                        }
+                    }
+                    _ => {
+                        admin_exists.set(Some(false));
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    match *admin_exists {
+        None => html! { <div>{ "Wird geladen..." }</div> },
+        Some(false) => {
+            navigator.push(&Route::Setup);
+            html! { <div>{ "Wird weitergeleitet zur Einrichtung..." }</div> }
+        }
+        Some(true) => props.children.clone().into(),
+    }
+}
+
+/// The main routing logic for the application.
+///
+/// This function takes a [`Route`] enum variant and returns the corresponding HTML
+/// content to be rendered. It acts as a central dispatcher for the application's
+/// navigation and authentication flow.
+///
+/// Most routes are wrapped in [`ProtectedRoute`] to enforce authentication
+/// and authorization based on the `admin_page` flag, and in [`SidebarShell`] to maintain consistent layout.
+/// Login and Setup routes use [`AdminCheckWrapper`] instead to handle pre-authentication states.
+///
+/// # Arguments
+/// - `route`: The [`Route`] enum variant representing the current URL path.
+///
+/// # Returns
+/// An `Html` component that should be rendered for the given route.
+///
+/// # Route Protection
+/// - **Admin-required routes** (`admin_page={true}`): Require both authentication and admin privileges
+/// - **Public routes** (`admin_page={false}`): Require only authentication
+/// - **Pre-auth routes** (`AdminCheckWrapper`): Used before admin creation or login
+fn switch(route: Route) -> Html {
+    match route {
+        Route::Home => html! {
+            <ProtectedRoute admin_page={false}>
+                <SidebarShell>
+                    <basic_pages::Home/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::NotFound => html! { <basic_pages::NotFound/> },
+        Route::Ticket => html! {
+            <ProtectedRoute admin_page={false}>
+                <SidebarShell>
+                    <ticket::SubmitTicket/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::TicketById { id } => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <ticket::TicketByID {id}/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::AllTickets => html! {
+            <ProtectedRoute admin_page={false}>
+                <SidebarShell>
+                    <ticket::AllTickets/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::ArchivedTickets => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <ticket::ArchivedTickets/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::Register => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <user::Register/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::Login => html! {
+            <AdminCheckWrapper>
+                <user::Login/>
+            </AdminCheckWrapper>
+        },
+        Route::Setup => html! {
+            <setup::InitialAdminSetup/>
+        },
+        Route::AllUsers => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <user::AllUsers/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::UserByID { id } => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <user::UserByID {id}/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+        Route::PermissionDenied => html! { <basic_pages::PermissionDenied/> },
+        Route::Diagnostics => html! {
+            <ProtectedRoute admin_page={true}>
+                <SidebarShell>
+                    <utilities::Diagnostics/>
+                </SidebarShell>
+            </ProtectedRoute>
+        },
+    }
+}
+
+/// The root component of the Yew application.
+///
+/// This component sets up the application's routing using `yew-router`'s
+/// `BrowserRouter` and `Switch` components. All other application content
+/// is rendered based on the current [`Route`] matched by the `switch` function.
+///
+/// Uses [`switch`] as the routing dispatcher to handle all route-specific rendering,
+/// which applies appropriate middleware like [`ProtectedRoute`] and [`AdminCheckWrapper`].
+///
+/// # Structure
+/// - `BrowserRouter`: Enables client-side routing.
+/// - `Switch`: Renders components based on the matched [`Route`].
+/// - `switch` function: Determines which component to render for each route.
+#[component(App)]
+pub fn app() -> Html {
+    html! {
+        <BrowserRouter>
+            <basic_pages::Icon/>
+            <Switch<Route> render={switch} />
+        </BrowserRouter>
+    }
+}

frontend/src/main.rs

@@ -0,0 +1,9 @@
+use frontend::App;
+
+/// Main entry point for the Yew frontend application.
+///
+/// Initializes the Yew framework and renders the root [`App`] component into the DOM.
+/// This function is typically called automatically by the WebAssembly runtime.
+fn main() {
+    yew::Renderer::<App>::new().render();
+}

frontend/src/pages/basic_pages.rs

@@ -0,0 +1,141 @@
+use gloo_net::http::Request;
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// Removes surrounding double quotes from a string.
+///
+/// This macro takes an expression that evaluates to a string and returns a new `String`
+/// with any leading or trailing double quotes removed. It's useful for cleaning up
+/// string data that might be inadvertently wrapped in quotes, such as JSON string values.
+///
+/// # Arguments
+///
+/// * `$str`: An expression that can be converted into a string slice (`&str`).
+///
+/// # Examples
+///
+/// ```rust
+/// use your_crate::dequote; // Assuming `dequote` is re-exported or in scope
+///
+/// let quoted_string = "\"hello world\"";
+/// let dequoted_string = dequote!(quoted_string);
+/// assert_eq!(dequoted_string, "hello world");
+///
+/// let already_clean = "no quotes";
+/// let dequoted_clean = dequote!(already_clean);
+/// assert_eq!(dequoted_clean, "no quotes");
+/// ```
+macro_rules! dequote {
+    ($str:expr) => {
+        $str.trim_matches('"').to_string()
+    };
+}
+
+/// The main home page component of the application.
+///
+/// This component displays different content based on whether the logged-in user
+/// is an administrator. It fetches the user's admin status from the
+/// `/api/users/current` endpoint upon initialization.
+///
+/// # Behavior
+/// - **Loading**: Displays "Loading..." while fetching user data.
+/// - **Admin User**: Renders the `TicketCount` utility component.
+/// - **Non-Admin User**: Renders the `TicketCount` utility component.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <Home />
+/// }
+/// ```
+#[component(Home)]
+pub fn home_component() -> Html {
+    let name = use_state(|| "".to_string());
+    {
+        let name = name.clone();
+        use_effect_with((), move |_| {
+            spawn_local(async move {
+                let response = Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await;
+
+                match response {
+                    Ok(resp) if resp.status() == 200 => {
+                        let user_data: serde_json::Value = resp.json().await.unwrap_or_default();
+                        let name_value = format!(
+                            "{} {}",
+                            dequote!(user_data["data"]["first_name"].to_string()),
+                            dequote!(user_data["data"]["last_name"].to_string())
+                        );
+                        name.set(name_value);
+                    }
+                    _ => name.set("Unknown".to_string()),
+                }
+            });
+            || ()
+        });
+    }
+
+    html! {
+        <div class="rundbg home">
+            <crate::utilities::TicketCount/>
+
+            <p class="login-status">{ "Sie sind angemeldet als: " }</p>
+            <p class="name">{ &*name }</p>
+        </div>
+    }
+}
+
+/// A basic component displayed when a requested route does not match any defined paths (404 error).
+///
+/// It provides a simple message indicating that the page was not found and includes
+/// a link to navigate back to the home page.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <NotFound />
+/// }
+/// ```
+#[component(NotFound)]
+pub fn not_found_component() -> Html {
+    let message = "404 Nicht gefunden";
+    html! {
+        <div>
+            <h1>{&message}</h1>
+            <Link<crate::Route> to={crate::Route::Home}>{ "Zurück zum Start" }</Link<crate::Route>>
+        </div>
+    }
+}
+
+/// A component displayed when a user attempts to access a page for which they do not have sufficient permissions.
+///
+/// It informs the user about the access restriction and provides instructions to contact
+/// a specific person ("Herr Winter") if they believe this is an error.
+/// It also includes a link to return to the home page.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <PermissionDenied />
+/// }
+/// ```
+#[component(PermissionDenied)]
+pub fn denied_component() -> Html {
+    html! {
+        <div>
+            <h1>{ "Sie haben nicht die benötigten Rechte um diese Seite aufzurufen" }</h1>
+            <h3>{ "Wenn sie denken, dass dies ein Fehler ist kontaktieren sie Herrn Winter" }</h3>
+            <Link<crate::Route> to={crate::Route::Home}>{ "Zurück zum Start" }</Link<crate::Route>>
+        </div>
+    }
+}
+
+#[component(Icon)]
+pub fn icon_component() -> Html {
+    html! {
+        <img src="/assets/csg.png" class="csg-icon" />
+    }
+}

frontend/src/pages/mod.rs

@@ -0,0 +1,14 @@
+//! This module aggregates and re-exports all individual page components of the application.
+//!
+//! Each sub-module within `pages` typically represents a distinct view or section
+//! of the user interface, such as authentication, ticket management, or user profiles.
+//!
+//! By re-exporting them here, other parts of the application can import page
+//! components more conveniently using `crate::pages::*`.
+pub mod basic_pages;
+pub mod qr;
+pub mod setup;
+pub mod sidebar;
+pub mod ticket;
+pub mod user;
+pub mod utilities;

frontend/src/pages/qr.rs

@@ -0,0 +1,118 @@
+use base64::{Engine, engine::general_purpose::STANDARD};
+use gloo_net::http::Request;
+use serde::{Deserialize, Serialize};
+use yew::prelude::*;
+
+#[derive(Deserialize, Clone)]
+struct QrResponse {
+    raw_token: String,
+}
+#[derive(Properties, PartialEq)]
+pub struct QrManagerProps {
+    pub user_id: i16,
+}
+
+#[derive(Serialize)]
+pub struct QrPayload {
+    user_id: i16,
+}
+
+#[function_component(QrManager)]
+pub fn qr_manager(props: &QrManagerProps) -> Html {
+    let qr_image_data = use_state(|| None::<String>);
+    let error_message = use_state(|| None::<String>);
+    let user_id = props.user_id;
+
+    let on_generate_click = {
+        let qr_image_data = qr_image_data.clone();
+        let error_message = error_message.clone();
+
+        Callback::from(move |_| {
+            let qr_image_data = qr_image_data.clone();
+            let error_message = error_message.clone();
+
+            wasm_bindgen_futures::spawn_local(async move {
+                let payload = QrPayload { user_id };
+
+                match Request::post("/api/generate_qr")
+                    .json(&payload)
+                    .unwrap()
+                    .send()
+                    .await
+                {
+                    Ok(response) if response.ok() => {
+                        if let Ok(data) = response.json::<QrResponse>().await {
+                            // Point scanned link to the public login endpoint with the token
+                            let target_url = format!(
+                                "{}/api/qr_login?token={}",
+                                std::env::var("ORIGIN")
+                                    .ok()
+                                    .unwrap_or("http://localhost:8000".to_string()),
+                                data.raw_token
+                            );
+
+                            match qrcode_generator::to_png_to_vec(
+                                target_url,
+                                qrcode_generator::QrCodeEcc::Medium,
+                                250,
+                            ) {
+                                Ok(png_bytes) => {
+                                    let base64_png = format!(
+                                        "data:image/png;base64,{}",
+                                        STANDARD.encode(&png_bytes)
+                                    );
+                                    qr_image_data.set(Some(base64_png));
+                                    error_message.set(None);
+                                }
+                                Err(_) => {
+                                    error_message
+                                        .set(Some("Failed to render QR graphic.".to_string()));
+                                }
+                            }
+                        }
+                    }
+                    _ => {
+                        error_message.set(Some(
+                            "Failed to generate token. Are you logged in as an admin?".to_string(),
+                        ));
+                    }
+                }
+            });
+        })
+    };
+
+    html! {
+        <div style="text-align: center; padding: 15px; border: 1px dashed #ccc; border-radius: 6px;">
+            <h4>{"Permanent Login Access"}</h4>
+            <p style="font-size: 0.85em; color: #555;">
+                { format!("Generate a permanent bypass login QR code for User #{}", user_id) }
+            </p>
+
+            <button
+                onclick={on_generate_click}
+                style="padding: 8px 16px; background-color: #28a745; color: white; border: none; border-radius: 4px; cursor: pointer; font-weight: bold;"
+            >
+                {"Generate QR Code"}
+            </button>
+
+            { if let Some(ref err) = *error_message {
+                html! { <p style="color: #dc3545; margin-top: 10px; font-size: 0.9em;">{err}</p> }
+            } else {
+                html! {}
+            }}
+
+            { if let Some(ref qr_src) = *qr_image_data {
+                html! {
+                    <div style="margin-top: 15px;">
+                        <img src={qr_src.clone()} alt="Login QR Code" style="border: 1px solid #ddd; padding: 8px; background: white;" />
+                        <p style="font-size: 0.8em; color: #dc3545; font-weight: bold; margin-top: 8px;">
+                            {"Warn the user to keep this QR code secure!"}
+                        </p>
+                    </div>
+                }
+            } else {
+                html! {}
+            }}
+        </div>
+    }
+}

frontend/src/pages/setup.rs

@@ -0,0 +1,283 @@
+use gloo_net::http::Request;
+use serde::{Deserialize, Serialize};
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// Payload for creating the initial administrator account.
+///
+/// This struct is sent to the `/api/setup-admin` endpoint to create the first admin user
+/// when no administrators exist in the system. It carries the necessary information
+/// for the new admin's profile and credentials.
+///
+/// # Fields
+/// - `first_name`: The first name of the administrator.
+/// - `last_name`: The last name of the administrator.
+/// - `username`: The unique username for the administrator's login.
+/// - `pwd`: The password for the administrator's account. This will be hashed on the backend.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct AdminSetupScheme {
+    pub first_name: String,
+    pub last_name: String,
+    pub username: String,
+    pub is_admin: bool,
+    pub pwd: String,
+}
+
+/// Component for the initial admin account setup page.
+///
+/// This page is displayed when a fresh system has no administrator accounts. It provides
+/// a form to create the first admin user. Key functionality:
+///
+/// - **Admin Check**: On mount, verifies if an admin already exists by calling `/api/check-admin`.
+///   If an admin is found, the user is redirected to the login page ([`crate::Route::Login`]).
+/// - **Form Fields**: Collects `first_name`, `last_name`, `username`, `password`, and `confirm_password`.
+/// - **Form Validation**:
+///   - Ensures password fields are not empty.
+///   - Verifies that `password` and `confirm_password` match.
+///   - Ensures the `username` field is not empty.
+/// - **API Interaction**: On form submission, a POST request is sent to `/api/setup-admin`
+///   with the new admin's details.
+/// - **Password Hashing**: The backend is responsible for hashing the password using Argon2
+///   before storage; this component only sends the plain text password.
+/// - **Auto-redirect**: On successful admin account creation, the user is automatically
+///   redirected to the login page (`crate::Route::Login`).
+/// - **State Management**: Uses Yew's `use_state` hooks to manage:
+///   - Input field values (`first_name`, `last_name`, `username`, `pwd`, `pwd_confirm`).
+///   - UI states like `error` messages, `success` status, and `loading` indicators.
+///   - `admin_check_done` to prevent rendering the form before the initial admin check completes.
+///
+/// # Example Flow
+/// 1. User navigates to `/setup`.
+/// 2. The component checks `/api/check-admin`.
+/// 3. If an admin exists, redirects to `/login`.
+/// 4. If no admin exists, the setup form is displayed.
+/// 5. User fills out the form and submits.
+/// 6. Form data is sent via POST to `/api/setup-admin`.
+/// 7. On successful response (HTTP 200), redirects to `/login`.
+/// 8. On error, displays an error message to the user.
+///
+/// # Security Notes
+/// - The initial admin check prevents re-creating an admin if one already exists.
+/// - Password confirmation helps prevent user typos for critical credentials.
+/// - Backend validation further ensures non-empty and secure credentials.
+#[component(InitialAdminSetup)]
+pub fn initial_admin_setup() -> Html {
+    let first_name = use_state(|| "".to_string());
+    let last_name = use_state(|| "".to_string());
+    let username = use_state(|| "".to_string());
+    let pwd = use_state(|| "".to_string());
+    let pwd_confirm = use_state(|| "".to_string());
+    let error = use_state(|| String::new());
+    let success = use_state(|| false);
+    let loading = use_state(|| false);
+    let admin_check_done = use_state(|| false);
+    let navigator = use_navigator().unwrap();
+
+    {
+        let admin_check_done = admin_check_done.clone();
+        let navigator = navigator.clone();
+        use_effect_with((), move |_| {
+            let admin_check_done = admin_check_done.clone();
+            let navigator = navigator.clone();
+            spawn_local(async move {
+                match Request::get("/api/check-admin").send().await {
+                    Ok(resp) if resp.status() == 200 => {
+                        if let Ok(data) = resp.json::<serde_json::Value>().await {
+                            let has_admin = data["has_admin"].as_bool().unwrap_or(false);
+                            if has_admin {
+                                navigator.push(&crate::Route::Login);
+                            } else {
+                                admin_check_done.set(true);
+                            }
+                        } else {
+                            admin_check_done.set(true);
+                        }
+                    }
+                    _ => {
+                        admin_check_done.set(true);
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    if !*admin_check_done {
+        return html! { <div>{ "Wird überprüft..." }</div> };
+    }
+
+    let onsubmit = {
+        let first_name = first_name.clone();
+        let last_name = last_name.clone();
+        let username = username.clone();
+        let pwd = pwd.clone();
+        let pwd_confirm = pwd_confirm.clone();
+        let error = error.clone();
+        let success = success.clone();
+        let loading = loading.clone();
+        let navigator = navigator.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+
+            if (*pwd).is_empty() || (*pwd_confirm).is_empty() {
+                error.set("Passwortfelder dürfen nicht leer sein".to_string());
+                return;
+            }
+
+            if *pwd != *pwd_confirm {
+                error.set("Passwörter stimmen nicht überein".to_string());
+                return;
+            }
+
+            if (*username).is_empty() {
+                error.set("Benutzername darf nicht leer sein".to_string());
+                return;
+            }
+
+            let first_name_val = (*first_name).clone();
+            let last_name_val = (*last_name).clone();
+            let username_val = (*username).clone();
+            let pwd_val = (*pwd).clone();
+
+            loading.set(true);
+            error.set(String::new());
+            success.set(false);
+
+            let error = error.clone();
+            let success = success.clone();
+            let loading = loading.clone();
+            let navigator = navigator.clone();
+
+            spawn_local(async move {
+                let payload = AdminSetupScheme {
+                    first_name: first_name_val,
+                    last_name: last_name_val,
+                    username: username_val,
+                    is_admin: true,
+                    pwd: pwd_val,
+                };
+
+                let response = Request::post("/api/setup-admin")
+                    .header("Content-Type", "application/json")
+                    .json(&payload)
+                    .unwrap()
+                    .send()
+                    .await;
+
+                loading.set(false);
+
+                match response {
+                    Ok(r) if r.status() == 200 => {
+                        success.set(true);
+                        navigator.push(&crate::Route::Login);
+                    }
+                    Ok(r) => {
+                        let text = r.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        error.set(text);
+                    }
+                    Err(err) => error.set(format!("Netzwerkfehler: {}", err)),
+                }
+            });
+        })
+    };
+
+    html! {
+        <div class="setup-container rundbg">
+            <div class="setup-box">
+                <h1>{ "Admin-Einrichtung" }</h1>
+                <p>{ "Erstellen Sie Ihr erstes Administratorkonto" }</p>
+
+                <form {onsubmit} class="setup-form">
+                    <div class="form-group">
+                        <label for="first_name">{ "Vorname:" }
+                            <input
+                                id="first_name"
+                                type="text"
+                                placeholder="Vorname"
+                                value={(*first_name).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    first_name.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <div class="form-group">
+                        <label for="last_name">{ "Nachname:" }
+                            <input
+                                id="last_name"
+                                type="text"
+                                placeholder="Nachname"
+                                value={(*last_name).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    last_name.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <div class="form-group">
+                        <label for="username">{ "Benutzername:" }
+                            <input
+                                id="username"
+                                type="text"
+                                placeholder="Benutzername"
+                                value={(*username).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    username.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <div class="form-group">
+                        <label for="password">{ "Passwort:" }
+                            <input
+                                id="password"
+                                type="password"
+                                placeholder="Passwort"
+                                value={(*pwd).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    pwd.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <div class="form-group">
+                        <label for="pwd_confirm">{ "Passwort bestätigen:" }
+                            <input
+                                id="pwd_confirm"
+                                type="password"
+                                placeholder="Passwort bestätigen"
+                                value={(*pwd_confirm).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    pwd_confirm.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <button type="submit" disabled={*loading} class="submit-btn">
+                        { if *loading { "Wird erstellt..." } else { "Administratorkonto erstellen" } }
+                    </button>
+
+                    if !error.is_empty() {
+                        <p class="error-message" style="color:red">{ (*error).clone() }</p>
+                    }
+
+                    if *success {
+                        <p class="success-message" style="color:green">{ "Administratorkonto erfolgreich erstellt! Wird weitergeleitet zum Login..." }</p>
+                    }
+                </form>
+            </div>
+        </div>
+    }
+}

frontend/src/pages/sidebar.rs

@@ -0,0 +1,481 @@
+use gloo_net::http::Request;
+use gloo_storage::{LocalStorage, Storage};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::rc::Rc;
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// The key used to store and retrieve the sidebar's expansion state in `LocalStorage`.
+///
+/// This constant ensures consistency when accessing the stored state across different
+/// parts of the application. The value associated with this key in `LocalStorage`
+/// will be a serialized [`SidebarExpandState`] object.
+const STORAGE_KEY: &str = "sidebar_state";
+
+/// Represents the expansion state of collapsible menus within the sidebar.
+///
+/// This struct is used to persist the open/closed state of sidebar submenus,
+/// improving user experience by remembering their last interaction.
+/// The state is stored in and retrieved from `LocalStorage`.
+///
+/// # Fields
+/// - `ticket_open`: A boolean indicating if the "Tickets" submenu is expanded (`true`) or collapsed (`false`).
+/// - `users_open`: A boolean indicating if the "Users" submenu is expanded (`true`) or collapsed (`false`).
+#[derive(Clone, PartialEq, Serialize, Deserialize)]
+pub struct SidebarExpandState {
+    pub ticket_open: bool,
+    pub users_open: bool,
+}
+
+impl Default for SidebarExpandState {
+    /// Provides the default expansion state, where all submenus are collapsed.
+    fn default() -> Self {
+        Self {
+            ticket_open: false,
+            users_open: false,
+        }
+    }
+}
+
+/// Represents the shared state for the sidebar's expandable menus.
+///
+/// This context struct is provided via Yew's `ContextProvider` and allows child components
+/// within the sidebar to read and modify the expansion state of the "Tickets" and "Users" menus.
+///
+/// # Fields
+/// - `expand`: The current [`SidebarExpandState`] holding whether each menu is open or closed.
+/// - `set_tickets_open`: A `Callback<bool>` to explicitly set the open state of the "Tickets" menu.
+/// - `toggle_tickets`: A `Callback<()>` to toggle the open state of the "Tickets" menu.
+/// - `set_users_open`: A `Callback<bool>` to explicitly set the open state of the "Users" menu.
+/// - `toggle_users`: A `Callback<()>` to toggle the open state of the "Users" menu.
+#[derive(Clone, PartialEq)]
+pub struct SidebarState {
+    pub expand: SidebarExpandState,
+    pub set_tickets_open: Callback<bool>,
+    pub toggle_tickets: Callback<()>,
+    pub set_users_open: Callback<bool>,
+    pub toggle_users: Callback<()>,
+}
+
+impl SidebarState {
+    /// Creates a new `SidebarState` instance.
+    ///
+    /// This constructor is typically used within the [`SidebarStateProvider`] to
+    /// bundle the current expansion state and its associated callbacks for context sharing.
+    fn new(
+        expand: SidebarExpandState,
+        set_tickets_open: Callback<bool>,
+        toggle_tickets: Callback<()>,
+        set_users_open: Callback<bool>,
+        toggle_users: Callback<()>,
+    ) -> Self {
+        Self {
+            expand,
+            set_tickets_open,
+            toggle_tickets,
+            set_users_open,
+            toggle_users,
+        }
+    }
+}
+
+/// Properties for components that provide sidebar state.
+///
+/// This struct is typically used by context providers that wrap child components
+/// and supply them with shared sidebar-related state or functionality.
+///
+/// # Fields
+/// - `children`: The child components that will have access to the provided sidebar state.
+#[derive(Properties, PartialEq)]
+pub struct SidebarProps {
+    pub children: Children,
+}
+
+/// A Yew context provider component that manages and supplies the sidebar's expansion state.
+///
+/// This component is responsible for:
+/// 1. Loading the initial `SidebarExpandState` from browser `LocalStorage` (or using defaults).
+/// 2. Providing a `SidebarState` context (`Rc<SidebarState>`) to its children, which includes
+///    the current expansion state and callbacks to modify it.
+/// 3. Persisting any changes to the `SidebarExpandState` back to `LocalStorage`.
+///
+/// Child components (like [`TicketMenu`] and [`UsersMenu`]) can consume this context
+/// to react to and control the sidebar's collapsible sections.
+///
+/// # LocalStorage Key
+/// The state is stored under the key `STORAGE_KEY` ("sidebar_state").
+///
+/// # Example Usage
+/// ```rust
+/// html! {
+///     <SidebarStateProvider>
+///         <Sidebar /> // Sidebar and its sub-components will have access to the state
+///     </SidebarStateProvider>
+/// }
+/// ```
+#[component(SidebarStateProvider)]
+pub fn sidebar_state_provider(props: &SidebarProps) -> Html {
+    let default = LocalStorage::get(STORAGE_KEY).unwrap_or_else(|_| SidebarExpandState::default());
+    let state = use_state(|| default);
+
+    {
+        let state = state.clone();
+        use_effect_with(state, move |s| {
+            LocalStorage::set(STORAGE_KEY, &**s).ok();
+            || ()
+        });
+    }
+
+    let set_tickets_open = {
+        let state = state.clone();
+        Callback::from(move |v: bool| {
+            state.set(SidebarExpandState {
+                ticket_open: v,
+                users_open: state.users_open,
+            })
+        })
+    };
+
+    let toggle_tickets = {
+        let state = state.clone();
+        Callback::from(move |_| {
+            let current = state.ticket_open;
+            state.set(SidebarExpandState {
+                ticket_open: !current,
+                users_open: state.users_open,
+            });
+        })
+    };
+
+    let set_users_open = {
+        let state = state.clone();
+        Callback::from(move |v: bool| {
+            state.set(SidebarExpandState {
+                ticket_open: state.ticket_open,
+                users_open: v,
+            })
+        })
+    };
+
+    let toggle_users = {
+        let state = state.clone();
+        Callback::from(move |_| {
+            let current = state.users_open;
+            state.set(SidebarExpandState {
+                ticket_open: state.ticket_open,
+                users_open: !current,
+            });
+        })
+    };
+
+    let ctx = SidebarState::new(
+        (*state).clone(),
+        set_tickets_open,
+        toggle_tickets,
+        set_users_open,
+        toggle_users,
+    );
+
+    html! {
+        <ContextProvider<Rc<SidebarState>> context={Rc::new(ctx)}>
+            { for props.children.iter() }
+        </ContextProvider<Rc<SidebarState>>>
+    }
+}
+
+/// A collapsible menu component for "Tickets" within the sidebar.
+///
+/// This component consumes the [`SidebarState`] context to manage its expanded/collapsed state.
+/// It displays a button to toggle its visibility and, when expanded, reveals links
+/// for "Submit Ticket" and "View Tickets".
+///
+/// # Context
+/// Requires [`SidebarStateProvider`] as an ancestor to provide the necessary context.
+///
+/// # Functionality
+/// - **Toggle Button**: Clicking the button toggles the `ticket_open` state in the `SidebarState`.
+/// - **Submenu Links**:
+///   - [`crate::Route::Ticket`]: Link to submit a new ticket.
+///   - [`crate::Route::AllTickets`]: Link to view all tickets.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <TicketMenu />
+/// }
+/// ```
+#[component(TicketMenu)]
+pub fn ticket_menu() -> Html {
+    let ctx =
+        use_context::<Rc<SidebarState>>().expect("TicketsMenu must be inside SidebarStateProvider");
+
+    let on_toggle = {
+        let cb = ctx.toggle_tickets.clone();
+        Callback::from(move |_| cb.emit(()))
+    };
+
+    let open = ctx.expand.ticket_open;
+
+    html! {
+        <li class={ if open { "menu open" } else { "menu" } }>
+            <button
+                class="menu-toggle"
+                onclick={on_toggle}
+                aria-expanded={open.to_string()}
+            >
+                { "Tickets" }
+                { if open { " ▾" } else { " ▸" } }
+            </button>
+
+            {
+                if open {
+                    html! {
+                        <ul class="submenu" role="menu">
+                            <li role="none">
+                                <Link<crate::Route> to={crate::Route::Ticket}><span role="menuitem">{ "Ticket einreichen" }</span></Link<crate::Route>>
+                            </li>
+                            <li role="none">
+                                <Link<crate::Route> to={crate::Route::AllTickets}><span role="menuitem">{ "Tickets anzeigen" }</span></Link<crate::Route>>
+                            </li>
+                        </ul>
+                    }
+                } else {
+                    html!{}
+                }
+            }
+        </li>
+    }
+}
+
+/// A collapsible menu component for "Users" within the sidebar.
+///
+/// This component consumes the [`SidebarState`] context to manage its expanded/collapsed state.
+/// It displays a button to toggle its visibility and, when expanded, reveals links
+/// for "Create User" and "View Users". This menu is typically only visible to administrators.
+///
+/// # Context
+/// Requires [`SidebarStateProvider`] as an ancestor to provide the necessary context.
+///
+/// # Functionality
+/// - **Toggle Button**: Clicking the button toggles the `users_open` state in the `SidebarState`.
+/// - **Submenu Links**:
+///   - [`crate::Route::Register`]: Link to create a new user account.
+///   - [`crate::Route::AllUsers`]: Link to view all registered users.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <UsersMenu />
+/// }
+/// ```
+#[component(UsersMenu)]
+pub fn users_menu() -> Html {
+    let ctx =
+        use_context::<Rc<SidebarState>>().expect("UsersMenu must be inside SidebarStateProvider");
+
+    let on_toggle = {
+        let cb = ctx.toggle_users.clone();
+        Callback::from(move |_| cb.emit(()))
+    };
+
+    let open = ctx.expand.users_open;
+
+    html! {
+        <li class={ if open { "menu open" } else { "menu" } }>
+            <button
+                class="menu-toggle"
+                onclick={on_toggle}
+                aria-expanded={open.to_string()}
+            >
+                { "Benutzer" }
+                { if open { " ▾" } else { " ▸" } }
+            </button>
+
+            {
+                if open {
+                    html! {
+                        <ul class="submenu" role="menu">
+                            <li role="none">
+                                <Link<crate::Route> to={crate::Route::Register}><span role="menuitem">{ "Benutzer erstellen" }</span></Link<crate::Route>>
+                            </li>
+                            <li role="none">
+                                <Link<crate::Route> to={crate::Route::AllUsers}><span role="menuitem">{ "Benutzer anzeigen" }</span></Link<crate::Route>>
+                            </li>
+                        </ul>
+                    }
+                } else {
+                    html!{}
+                }
+            }
+        </li>
+    }
+}
+
+/// The main sidebar component of the application.
+///
+/// This component dynamically renders its content based on the user's authentication
+/// and administrative status. It fetches the current user's details via `/api/users/current`
+/// to determine what menu items to display.
+///
+/// # Mobile Support
+/// On small screens:
+/// - Slides into view from the left when `props.is_open` is `true`.
+/// - Renders a close button (`✕`) in the header that emits `props.on_close`.
+///
+/// # Structure
+/// - Wraps its content in a [`SidebarStateProvider`] to allow nested menus to manage their state.
+/// - Contains a navigation (`<nav>`) element with an unordered list (`<ul>`) of menu items.
+///
+/// # Conditional Rendering
+/// - **Loading**: Displays "Loading..." while fetching user data.
+/// - **Non-Admin User**: Renders a condensed sidebar including:
+///   - [`TicketMenu`]: For managing tickets.
+///   - A "Logout" button.
+/// - **Admin User**: Renders a full sidebar including:
+///   - [`TicketMenu`]: For managing tickets.
+///   - [`UsersMenu`]: For managing user accounts.
+///   - A direct link to [`crate::Route::Diagnostics`] (Statistiken).
+///   - A "Logout" button.
+///
+/// # Logout Functionality
+/// The "Logout" button sends a GET request to `/api/logout`, clears the user's session,
+/// and then redirects the user to the login page (`crate::Route::Login`).
+/// Properties for the [`Sidebar`] component.
+///
+/// These properties enable managing and controlling the responsive mobile sidebar
+/// layout and its visibility settings.
+#[derive(Properties, PartialEq)]
+pub struct SidebarComponentProps {
+    /// A boolean flag indicating whether the mobile sidebar is currently slid open (`true`) or hidden (`false`).
+    #[prop_or_default]
+    pub is_open: bool,
+    /// A callback emitted when the user requests to close/hide the mobile sidebar.
+    #[prop_or_default]
+    pub on_close: Callback<()>,
+}
+
+#[component(Sidebar)]
+pub fn sidebar(props: &SidebarComponentProps) -> Html {
+    let is_admin = use_state(|| None::<bool>);
+    let navigator = use_navigator().expect("Sidebar must be used within a Router");
+
+    {
+        let is_admin = is_admin.clone();
+        use_effect_with((), move |_| {
+            spawn_local(async move {
+                let response = Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await;
+
+                match response {
+                    Ok(resp) if resp.status() == 200 => {
+                        let user_data: Value = resp.json().await.unwrap_or_default();
+                        let admin_value = user_data["data"]["is_admin"].as_bool();
+                        is_admin.set(admin_value);
+                    }
+                    _ => is_admin.set(Some(false)),
+                }
+            });
+            || ()
+        });
+    }
+
+    let on_logout = {
+        let navigator = navigator.clone();
+        Callback::from(move |_| {
+            let navigator = navigator.clone();
+            spawn_local(async move {
+                let _ = Request::get("/api/logout")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await;
+                navigator.push(&crate::Route::Login);
+            });
+        })
+    };
+
+    match *is_admin {
+        None => html! { <div class="sidebar-loading">{ "Wird geladen..." }</div> },
+
+        // Non-admin: render a condensed user sidebar (no diagnostics, limited links)
+        Some(false) => {
+            let on_close = props.on_close.clone();
+            html! {
+                <SidebarStateProvider>
+                    <nav class={if props.is_open { "sidebar user open" } else { "sidebar user" }}>
+                        <ul>
+                            <li class="sidebar-header">
+                                <Link<crate::Route> to={crate::Route::Home} classes="home">
+                                    <svg xmlns="http://www.w3.org/2000/svg" class="home-svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                        <path d="m3 9 9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/>
+                                        <polyline points="9 22 9 12 15 12 15 22"/>
+                                    </svg>
+                                </Link<crate::Route>>
+                                <button class="sidebar-close" onclick={move |_| on_close.emit(())}>
+                                    <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                        <line x1="18" y1="6" x2="6" y2="18"/>
+                                        <line x1="6" y1="6" x2="18" y2="18"/>
+                                    </svg>
+                                </button>
+                            </li>
+                            <TicketMenu/>
+                            <li class="logout-item">
+                                <crate::darkmode::ThemeToggle/>
+                                <button
+                                    class="sidebar-button"
+                                    onclick={on_logout.clone()}
+                                >
+                                    { "Abmelden" }
+                                </button>
+                            </li>
+                        </ul>
+                    </nav>
+                </SidebarStateProvider>
+            }
+        }
+
+        // Admin: full sidebar wrapped in provider so submenu state persists
+        Some(true) => {
+            let on_close = props.on_close.clone();
+            html! {
+                <SidebarStateProvider>
+                    <nav class={if props.is_open { "sidebar admin open" } else { "sidebar admin" }}>
+                        <ul>
+                            <li class="sidebar-header">
+                                <Link<crate::Route> to={crate::Route::Home} classes="home">
+                                    <svg xmlns="http://www.w3.org/2000/svg" class="home-svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                        <path d="m3 9 9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/>
+                                        <polyline points="9 22 9 12 15 12 15 22"/>
+                                    </svg>
+                                </Link<crate::Route>>
+                                <button class="sidebar-close" onclick={move |_| on_close.emit(())}>
+                                    <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                                        <line x1="18" y1="6" x2="6" y2="18"/>
+                                        <line x1="6" y1="6" x2="18" y2="18"/>
+                                    </svg>
+                                </button>
+                            </li>
+                            <TicketMenu/>
+                            <UsersMenu/>
+                            <Link<crate::Route> to={crate::Route::Diagnostics}>{ "Statistiken" }</Link<crate::Route>>
+                            <Link<crate::Route> to={crate::Route::ArchivedTickets}>{ "Archiv" }</Link<crate::Route>>
+                            <li class="logout-item">
+                                <crate::darkmode::ThemeToggle/>
+                                <button
+                                    class="sidebar-button"
+                                    onclick={on_logout.clone()}
+                                >
+                                    { "Abmelden" }
+                                </button>
+                            </li>
+                        </ul>
+                    </nav>
+                </SidebarStateProvider>
+            }
+        }
+    }
+}
+

frontend/src/pages/ticket.rs

@@ -0,0 +1,825 @@
+use std::collections::HashSet;
+
+use chrono_tz::Europe::Berlin;
+use gloo_net::http::Request;
+use serde::{Deserialize, Serialize};
+use wasm_bindgen::JsCast;
+use wasm_bindgen_futures::spawn_local;
+use web_sys::HtmlSelectElement;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+/// A hardcoded list of valid room numbers for ticket submissions.
+///
+/// This array contains `i16` values representing valid rooms. Negative numbers typically
+/// denote rooms prefixed with 'K' (e.g., -1 for K1), and numbers greater than or equal to 1000
+/// denote rooms prefixed with 'D' (e.g., 1001 for D1).
+///
+/// This list is used for client-side validation of room input during ticket creation.
+const VALID_ROOMS: &[i16] = &[
+    1, 2, 3, 4, 5, 6, 7, 8, 9, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30,
+    32, 34, 36, 37, 39, 41, 49, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
+    118, 120, 121, 122, 123, 124, 126, 127, 128, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142,
+    143, 144, 145, 146, 147, 148, 150, 152, 153, 154, 155, 156, 157, 158, 159, 160, 201, 202, 203,
+    204, 205, 206, 207, 208, 209, 210, 211, 212, 214, 1001, 1002, 1003, -1, -2, -3, -4, -5, -6, -7,
+    -8,
+];
+
+/// Data transfer object (DTO) for creating a new ticket.
+///
+/// This struct defines the payload sent to the backend when a user submits a new ticket.
+/// It includes all necessary information for initial ticket creation.
+///
+/// # Fields
+/// - `category`: The category of the ticket (e.g., "Internet", "Hardware").
+/// - `betreff`: The subject or brief summary of the ticket.
+/// - `description`: A detailed description of the issue or request.
+/// - `room`: The room number where the issue is located.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct TicketCreateScheme {
+    pub category: String,
+    pub betreff: String,
+    pub description: String,
+    pub room: i16,
+}
+
+/// Data transfer object (DTO) for updating a ticket's status.
+///
+/// This struct is used when sending a request to the backend to change the status
+/// of an existing ticket.
+///
+/// # Fields
+/// - `status`: The new status of the ticket (e.g., "ToDo", "InProgress", "Completed", "Archived").
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct TicketUpdateScheme {
+    pub status: String,
+}
+
+/// Represents a complete ticket entity retrieved from the backend.
+///
+/// This struct holds all details of a ticket, including its metadata, content,
+/// and associated user information.
+///
+/// # Fields
+/// - `id`: The unique identifier of the ticket.
+/// - `category`: The category of the ticket.
+/// - `betreff`: The subject of the ticket.
+/// - `description`: The detailed description of the ticket.
+/// - `room`: The room number associated with the ticket.
+/// - `status`: The current status of the ticket.
+/// - `date`: The creation date and time of the ticket in UTC.
+/// - `user_id`: The ID of the user who created the ticket.
+/// - `user_first_name`: The first name of the user who created the ticket.
+/// - `user_last_name`: The last name of the user who created the ticket.
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+pub struct Ticket {
+    pub id: i32,
+    pub category: String,
+    pub betreff: String,
+    pub description: String,
+    pub room: i16,
+    pub status: String,
+    pub date: chrono::DateTime<chrono::Utc>,
+    pub user_id: i16,
+    pub user_first_name: String,
+    pub user_last_name: String,
+}
+
+/// Properties for components that display a single ticket.
+///
+/// This struct is used to pass the ID of a specific ticket to components
+/// that need to fetch or display its details.
+///
+/// # Fields
+/// - `id`: The unique identifier of the ticket to be displayed.
+#[derive(Properties, PartialEq)]
+pub struct TicketProps {
+    pub id: i32,
+}
+
+/// Represents the essential information of the currently authenticated user.
+///
+/// This struct is used to hold a subset of user data relevant for client-side
+/// logic, such as determining if the user is an administrator or filtering
+/// tickets by their ID.
+///
+/// # Fields
+/// - `id`: An `Option<i16>` holding the unique ID of the active user. `None` if not authenticated or ID is unavailable.
+/// - `is_admin`: A boolean indicating if the active user has administrator privileges.
+#[derive(Clone, Debug, PartialEq)]
+pub struct ActiveUser {
+    pub id: Option<i16>,
+    pub is_admin: bool,
+}
+
+/// Represents a standardized error response from the API.
+///
+/// This struct is used to deserialize error messages returned by the backend API,
+/// providing a consistent way to handle and display error information to the user.
+///
+/// # Fields
+/// - `message`: A descriptive error message.
+/// - `_status`: (Ignored) The HTTP status code or a status string from the API.
+#[derive(Deserialize, Debug)]
+struct ApiError {
+    message: String,
+    _status: String,
+}
+
+/// A component that provides a form for users to submit new tickets.
+///
+/// This component allows users to input details such as category, subject (`betreff`),
+/// description, and room number for a new support ticket. It includes client-side
+/// validation for the room number and interacts with the backend API to create the ticket.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `category`, `betreff`, `description`: Values of the form input fields.
+/// - `room`, `room_input`: The parsed and raw room numbers, respectively.
+/// - `status`: To display messages about submission success or errors.
+///
+/// # Room Input Handling
+/// The `room_change` callback handles parsing the room input:
+/// - Supports numerical room numbers (e.g., "101").
+/// - Supports 'K' prefixed rooms (e.g., "K1" parses to -1).
+/// - Supports 'D' prefixed rooms (e.g., "D1" parses to 1001).
+/// - Validates the parsed room against the `VALID_ROOMS` constant.
+///
+/// # Form Submission
+/// - Prevents default form submission behavior.
+/// - Performs validation for room number and presence in `VALID_ROOMS`.
+/// - Constructs a `TicketCreateScheme` payload.
+/// - Sends a POST request to `/api/tickets/create`.
+/// - Updates the `status` state based on the API response.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <SubmitTicket />
+/// }
+/// ```
+#[component(SubmitTicket)]
+pub fn submit_ticket_component() -> Html {
+    let category = use_state(|| "".to_string());
+    let betreff = use_state(|| "".to_string());
+    let description = use_state(|| "".to_string());
+    let room = use_state(|| None::<i16>);
+    let room_input = use_state(|| "".to_string());
+    let status = use_state(|| None::<String>);
+
+    let valid_rooms: HashSet<i16> = VALID_ROOMS.iter().copied().collect();
+
+    let onsubmit = {
+        let category = category.clone();
+        let betreff = betreff.clone();
+        let description = description.clone();
+        let room = room.clone();
+        let status = status.clone();
+        let valid_rooms = valid_rooms.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+            if room.is_none() {
+                status.set(Some("Ungültiger Raum".into()));
+                return;
+            }
+            let category = (*category).clone();
+            let betreff = (*betreff).clone();
+            let description = (*description).clone();
+            let room = room.unwrap();
+            if !valid_rooms.contains(&room) {
+                status.set(Some("Raum nicht erlaubt".into()));
+                return;
+            }
+            let status = status.clone();
+
+            spawn_local(async move {
+                let payload = TicketCreateScheme {
+                    category,
+                    betreff,
+                    description,
+                    room,
+                };
+
+                let request = Request::post("/api/tickets/create")
+                    .header("Content-Type", "application/json")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .json(&payload)
+                    .expect("Failed to build request");
+
+                match request.send().await {
+                    Ok(response) if response.status() == 200 => status.set(Some("Erfolg".into())),
+                    Ok(response) => {
+                        let text = response.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        status.set(Some(text));
+                    },
+                    Err(err) => status.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+            });
+        })
+    };
+
+    let category_change = {
+        let category = category.clone();
+        Callback::from(move |e: Event| {
+            let input: web_sys::HtmlSelectElement = e.target_unchecked_into();
+            category.set(input.value());
+        })
+    };
+
+    let betreff_change = {
+        let betreff = betreff.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            betreff.set(input.value());
+        })
+    };
+
+    let description_change = {
+        let description = description.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            description.set(input.value());
+        })
+    };
+
+    let room_change = {
+        let room = room.clone();
+        let room_input = room_input.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            let raw = input.value();
+            room_input.set(raw.clone());
+
+            let parsed_value: Option<i16> = if raw.trim().is_empty() {
+                None
+            } else {
+                let raw_trim = raw.trim();
+                if raw_trim.len() > 1 && (raw_trim.starts_with('K') || raw_trim.starts_with('k')) {
+                    match raw_trim[1..].parse::<i16>() {
+                        Ok(n) => Some(-n),
+                        Err(_) => None,
+                    }
+                } else if raw_trim.len() > 1
+                    && (raw_trim.starts_with('D') || raw_trim.starts_with('d'))
+                {
+                    match raw_trim[1..].parse::<i16>() {
+                        Ok(n) => Some(1000 + n),
+                        Err(_) => None,
+                    }
+                } else {
+                    match raw_trim.parse::<i16>() {
+                        Ok(n) => Some(n),
+                        Err(_) => None,
+                    }
+                }
+            };
+
+            if let Some(v) = parsed_value {
+                if !valid_rooms.contains(&v) {
+                    room.set(None);
+                } else {
+                    room.set(Some(v));
+                }
+            } else {
+                room.set(None);
+            }
+        })
+    };
+
+    let room_valid = (*room).is_some();
+
+    html! {
+        <form class="rundbg" {onsubmit}>
+            <label>{ "Betreff:" }
+                <input type="text" value={(*betreff).clone()} oninput={betreff_change}/>
+            </label>
+            <br/>
+            <label>{ "Beschreibung:" }
+                <input type="text" value={(*description).clone()} oninput={description_change}/>
+            </label>
+            <br/>
+            <label>{ "Kategorie:" }
+                <select value={(*category).clone()} onchange={category_change}>
+                    <option value="Whiteboard Beamer">{ "Whiteboard Beamer" }</option>
+                    <option value="Internet">{ "Internet" }</option>
+                    <option value="iPad Koffer">{ "iPad Koffer" }</option>
+                    <option value="Apple TV">{ "Apple TV" }</option>
+                    <option value="Docu Cam">{ "Dokumenten Kamera" }</option>
+                    <option value="Sonstiges">{ "Sonstiges" }</option>
+                </select>
+            </label>
+            <br/>
+            <label>{ "Raum:" }
+                <input type="text" value={(*room_input).clone()} oninput={room_change}/>
+            </label>
+            {
+                if !room_valid {
+                    html! {
+                        <p class="warning" >{ "Ungültiger/nicht erlaubter Raum (z. B. 101, K12, D5)" }</p>
+                    }
+                } else {
+                    html! {}
+                }
+            }
+            <br/>
+            <button type="submit">{ "Absenden" }</button>
+
+            <Link<crate::Route> to={crate::Route::AllTickets}>{ "Tickets ansehen" }</Link<crate::Route>>
+
+            {
+                if let Some(s) = &*status {
+                    html!{ <p>{ s }</p> }
+                } else {
+                    html!{}
+                }
+            }
+
+        </form>
+    }
+}
+
+/// A component for displaying, updating, and deleting a single ticket by its ID.
+///
+/// This component fetches a specific ticket's details from the backend based on the
+/// `id` provided in its `TicketProps`. It allows administrators to update the ticket's
+/// status and delete the ticket.
+///
+/// # Props
+/// - `id`: The `i32` ID of the ticket to fetch and display.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `ticket`: The fetched [`Ticket`] data, if available.
+/// - `error`: Any error message encountered during API calls.
+/// - `loading`: A boolean indicating if data is currently being fetched.
+/// - `status`: The selected status for updating the ticket.
+/// - `deleting`: A boolean indicating if a delete operation is in progress.
+/// - `delete_error`: Any error message from a delete operation.
+///
+/// # Functionality
+/// - **Data Fetching**: On component mount or `id` change, fetches ticket data from
+///   `/api/tickets/:id`.
+/// - **Status Update**: Provides a dropdown to change the ticket's status. Submitting the
+///   form sends a PATCH request to `/api/tickets/:id` with a `TicketUpdateScheme` payload.
+/// - **Ticket Deletion**: Includes a "Delete" button that, after user confirmation,
+///   sends a DELETE request to `/api/tickets/:id`. On success, clears the ticket from display.
+/// - **Error Handling**: Displays error messages for network issues, API errors, or parsing failures.
+/// - **Date Formatting**: Displays the ticket creation date formatted to `Europe/Berlin` timezone.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <TicketByID id={123} />
+/// }
+/// ```
+#[component(TicketByID)]
+pub fn ticket_by_id_component(props: &TicketProps) -> Html {
+    let ticket = use_state(|| None::<Ticket>);
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+    let id = props.id;
+    let status = use_state(|| "".to_string());
+
+    {
+        let ticket = ticket.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with(id, move |id_ref| {
+            loading.set(true);
+            let ticket = ticket.clone();
+            let error = error.clone();
+            let id = *id_ref;
+            spawn_local(async move {
+                let url = format!("/api/tickets/{}", id);
+                match Request::get(&url).send().await {
+                    Ok(response) => {
+                        let status = response.status();
+                        if status == 200 {
+                            match response.json::<Ticket>().await {
+                                Ok(t) => ticket.set(Some(t)),
+                                Err(err) => error.set(Some(format!("Parse error: {}", err))),
+                            }
+                        } else {
+                            match response.json::<ApiError>().await {
+                                Ok(ae) => error.set(Some(ae.message)),
+                                Err(_) => {
+                                    if let Ok(text) = response.text().await {
+                                        error.set(Some(text));
+                                    } else {
+                                        error.set(Some(format!("Server error: {}", status)));
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Network error: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+    let onsubmit = {
+        let status = status.clone();
+        let id = id.clone();
+        let error = error.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+            let form: web_sys::HtmlFormElement = e.target_unchecked_into();
+            let select_element = form
+                .query_selector("select[name=\"status\"]")
+                .ok()
+                .and_then(|opt| opt)
+                .and_then(|el| el.dyn_into::<HtmlSelectElement>().ok());
+            let new_status = select_element
+                .map(|s| s.value())
+                .unwrap_or_else(|| (*status).clone());
+            status.set(new_status.clone());
+
+            let id = id.clone();
+            let error = error.clone();
+
+            spawn_local(async move {
+                let value = TicketUpdateScheme { status: new_status };
+
+                let url = format!("/api/tickets/{}", id);
+                let request = Request::patch(&url)
+                    .json(&value)
+                    .expect("Failed to construct request");
+
+                match request.send().await {
+                    Ok(response) if response.status() == 200 => error.set(Some("Erfolg".into())),
+                    Ok(response) => {
+                        let text = response.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        error.set(Some(text));
+                    },
+                    Err(err) => error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+            });
+        })
+    };
+
+    let deleting = use_state(|| false);
+    let delete_error = use_state(|| None::<String>);
+
+    let ondelete = {
+        let deleting = deleting.clone();
+        let delete_error = delete_error.clone();
+        let ticket_state = ticket.clone();
+        let id = id;
+
+        Callback::from(move |e: MouseEvent| {
+            e.prevent_default();
+            if !web_sys::window()
+                .and_then(|w| w.confirm_with_message("Sicher löschen?").ok())
+                .unwrap_or(false)
+            {
+                return;
+            }
+
+            deleting.set(true);
+            delete_error.set(None);
+
+            let deleting = deleting.clone();
+            let delete_error = delete_error.clone();
+            let ticket_state = ticket_state.clone();
+
+            spawn_local(async move {
+                let url = format!("/api/tickets/{}", id);
+                let request =
+                    Request::delete(&url).credentials(web_sys::RequestCredentials::Include);
+
+                match request.send().await {
+                    Ok(resp) if resp.status() == 200 || resp.status() == 204 => {
+                        ticket_state.set(None);
+                    }
+                    Ok(resp) => {
+                        let txt = resp.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        delete_error.set(Some(txt));
+                    }
+                    Err(err) => delete_error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+                deleting.set(false);
+            });
+        })
+    };
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else if let Some(t) = &*ticket {
+        html! {
+            <div class="rundbg">
+                <h1>{ format!("Ticket #{}", t.id) }</h1>
+                <p><strong>{ "Kategorie: " }</strong>{ &t.category }</p>
+                <p><strong>{ "Betreff: " }</strong>{ &t.betreff }</p>
+                <p><strong>{ "Beschreibung: " }</strong>{ &t.description }</p>
+                <p><strong>{ "Raum: " }</strong>{ t.room }</p>
+                <p><strong>{ "Datum: " }</strong>{
+                    t.date.with_timezone(&Berlin).format("%d.%m.%Y %H:%M:%S").to_string()
+                }</p>
+                <p><strong>{ "Status: "}</strong>{ match t.status.as_str() {
+                    "ToDo" => "Zu tun",
+                    "InProgress" => "In Bearbeitung",
+                    "Completed" => "Erledigt",
+                    "Archived" => "Archiviert",
+                    _ => "Ungültiger Status"
+                }}</p>
+                <p><strong>{ "Name: "}</strong>{ format!{"{} {}", t.user_first_name, t.user_last_name } }</p>
+
+                <form {onsubmit}>
+                    <label>{ "Status ändern" }
+                        <select name="status">
+                            <option value="ToDo">{ "Zu tun" }</option>
+                            <option value="InProgress">{ "In Bearbeitung" }</option>
+                            <option value="Completed">{ "Erledigt" }</option>
+                            <option value="Archived">{ "Archiviert" }</option>
+                        </select>
+                    </label>
+                    <button type="submit">{ "Aktualisieren" }</button>
+                </form>
+
+                <button onclick={ondelete} disabled={*deleting}>
+                    {if *deleting {"Löschen..."} else {"Löschen"}}
+                </button>
+
+                <Link<crate::Route> to={crate::Route::AllTickets}>{ "Zurück zur Ticketübersicht" }</Link<crate::Route>>
+                if let Some(err) = &*delete_error {
+                    <p style="color:red">{ err.clone() }</p>
+                }
+            </div>
+        }
+    } else {
+        html! { <p>{ "Kein Ticket gefunden." }</p> }
+    }
+}
+
+/// A component for fetching and displaying a list of all tickets.
+///
+/// This component retrieves all tickets from the backend and presents them as a list.
+/// It dynamically filters the displayed tickets based on the current user's role:
+/// administrators see all tickets, while regular users only see tickets they created.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `tickets`: A vector of `Ticket` structs to store the fetched tickets.
+/// - `error`: Any error message encountered during API calls.
+/// - `loading`: A boolean indicating if data is currently being fetched.
+/// - `user`: An `ActiveUser` struct holding the current user's ID and admin status.
+///
+/// # Functionality
+/// - **Fetch Tickets**: On component mount, fetches all tickets from `/api/tickets`.
+/// - **Fetch Current User**: Concurrently fetches the current user's details from
+///   `/api/users/current` to determine their `user_id` and `is_admin` status.
+/// - **Conditional Display**:
+///   - If `loading` is true, displays "Loading...".
+///   - If an `error` occurs, displays the error message.
+///   - Otherwise, renders a list of tickets.
+/// - **Filtering**:
+///   - Administrators (`user.is_admin = true`) see all tickets.
+///   - Regular users (`user.is_admin = false`) only see tickets where `t.user_id == user.id`.
+/// - **Navigation**: Each ticket in the list is a link to [`crate::Route::TicketById`]
+///   for viewing individual ticket details.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <AllTickets />
+/// }
+/// ```
+#[component(AllTickets)]
+pub fn all_tickets_component() -> Html {
+    let tickets = use_state(|| Vec::<Ticket>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+    let user = use_state(|| ActiveUser {
+        id: None,
+        is_admin: false,
+    });
+
+    {
+        let tickets = tickets.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = format!("/api/tickets");
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<Ticket>>().await {
+                            Ok(t) => tickets.set(t),
+                            Err(e) => error.set(Some(format!("parse error: {}", e))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Network error: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    {
+        let user = user.clone();
+        use_effect_with((), move |_| {
+            let user = user.clone();
+            spawn_local(async move {
+                if let Ok(response) = Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await
+                {
+                    if response.status() == 200 {
+                        if let Ok(json) = response.json::<serde_json::Value>().await {
+                            let id = json
+                                .get("data")
+                                .and_then(|d| d.get("id"))
+                                .and_then(|v| v.as_i64())
+                                .and_then(|n| i16::try_from(n).ok());
+                            let is_admin = json
+                                .get("data")
+                                .and_then(|d| d.get("is_admin"))
+                                .and_then(|v| v.as_bool())
+                                .unwrap_or(false);
+                            user.set(ActiveUser { id, is_admin });
+                        }
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else {
+        html! {
+            <ul class= "postits">
+            { for tickets.iter().filter(|t| t.status != "Archived" && (if user.is_admin { true } else if let Some(uid) = user.id { t.user_id == uid } else { false })).map(|t| {
+                let status_class = match t.status.as_str() {
+                    "ToDo" => "To-Do",
+                    "InProgress" => "InProgress",
+                    "Completed" => "Completed",
+                    "Archived" => "Archived",
+                    _ => "To-Do"
+                };
+                html! {
+                    <div class={classes!{status_class, "listbox"}}>
+                        <li key={t.id.to_string()}>
+                            <Link<crate::Route> to={crate::Route::TicketById{id: t.id}}><h3>{ format!("{}", t.betreff,) }</h3></Link<crate::Route>>
+                        </li>
+
+                    </div>
+                }})}
+            </ul>
+        }
+    }
+}
+
+/// A component for fetching and displaying a list of archived tickets.
+///
+/// This component retrieves all tickets from the backend and presents them as a list,
+/// filtered to only show those with "Archived" status.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `tickets`: A vector of `Ticket` structs to store the fetched tickets.
+/// - `error`: Any error message encountered during API calls.
+/// - `loading`: A boolean indicating if data is currently being fetched.
+/// - `user`: An `ActiveUser` struct holding the current user's ID and admin status.
+///
+/// # Functionality
+/// - **Fetch Tickets**: On component mount, fetches all tickets from `/api/tickets`.
+/// - **Fetch Current User**: Concurrently fetches the current user's details from
+///   `/api/users/current` to determine their `user_id` and `is_admin` status.
+/// - **Conditional Display**:
+///   - If `loading` is true, displays "Loading...".
+///   - If an `error` occurs, displays the error message.
+///   - Otherwise, renders a list of tickets.
+/// - **Filtering**:
+///   - Only tickets with `t.status == "Archived"` are displayed.
+///   - If the user is an admin, all archived tickets are shown.
+///   - If the user is not an admin, only their own archived tickets are shown.
+/// - **Navigation**: Each ticket in the list is a link to [`crate::Route::TicketById`]
+///   for viewing individual ticket details.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <ArchivedTickets />
+/// }
+/// ```
+#[component(ArchivedTickets)]
+pub fn archived_tickets_component() -> Html {
+    let tickets = use_state(|| Vec::<Ticket>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+    let user = use_state(|| ActiveUser {
+        id: None,
+        is_admin: false,
+    });
+
+    {
+        let tickets = tickets.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = format!("/api/tickets");
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<Ticket>>().await {
+                            Ok(t) => tickets.set(t),
+                            Err(e) => error.set(Some(format!("Parsefehler: {}", e))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("Status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    {
+        let user = user.clone();
+        use_effect_with((), move |_| {
+            let user = user.clone();
+            spawn_local(async move {
+                if let Ok(response) = Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await
+                {
+                    if response.status() == 200 {
+                        if let Ok(json) = response.json::<serde_json::Value>().await {
+                            let id = json
+                                .get("data")
+                                .and_then(|d| d.get("id"))
+                                .and_then(|v| v.as_i64())
+                                .and_then(|n| i16::try_from(n).ok());
+                            let is_admin = json
+                                .get("data")
+                                .and_then(|d| d.get("is_admin"))
+                                .and_then(|v| v.as_bool())
+                                .unwrap_or(false);
+                            user.set(ActiveUser { id, is_admin });
+                        }
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else {
+        html! {
+            <ul class="postits">
+            { for tickets.iter().filter(|t| t.status == "Archived" && (user.is_admin || if let Some(uid) = user.id { t.user_id == uid } else { false })).map(|t| html! {
+                    <div class="listbox">
+                        <li key={t.id.to_string()}>
+                            <Link<crate::Route> to={crate::Route::TicketById{id: t.id}}><h3>{ format!("{} - #{}", t.betreff, t.id) }</h3></Link<crate::Route>>
+                            <p>{ &t.description }</p>
+                            <p>{ match t.status.as_str() {
+                                "ToDo" => "Zu tun",
+                                "InProgress" => "In Bearbeitung",
+                                "Completed" => "Erledigt",
+                                "Archived" => "Archiviert",
+                                _ => "Ungültiger Status"
+                            }}</p>
+                        </li>
+
+                    </div>
+                })}
+            </ul>
+        }
+    }
+}

frontend/src/pages/user.rs

@@ -0,0 +1,769 @@
+use gloo_net::http::Request;
+use serde::{Deserialize, Serialize};
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+use yew_router::prelude::*;
+
+// #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+// pub struct User {
+//     pub id: i16,
+//     pub last_name: String,
+//     pub first_name: String,
+//     pub username: String,
+//     pub is_admin: bool,
+//     pub pwd: String,
+// }
+
+/// Data transfer object (DTO) for creating a new user.
+///
+/// This struct defines the payload sent to the backend when an administrator
+/// registers a new user. It includes all necessary information for user creation.
+///
+/// # Fields
+/// - `first_name`: The first name of the user.
+/// - `last_name`: The last name of the user.
+/// - `username`: The unique username for the user's login.
+/// - `is_admin`: A boolean indicating whether the new user should have administrator privileges.
+/// - `pwd`: The password for the user's account. This will be hashed on the backend.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct UserCreateScheme {
+    pub first_name: String,
+    pub last_name: String,
+    pub username: String,
+    pub is_admin: bool,
+    pub pwd: String,
+}
+
+/// Data transfer object (DTO) for user login credentials.
+///
+/// This struct defines the payload sent to the backend when a user attempts to log in.
+///
+/// # Fields
+/// - `username`: The username provided by the user.
+/// - `pwd`: The password provided by the user.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct LoginScheme {
+    pub username: String,
+    pub pwd: String,
+}
+
+/// Data transfer object (DTO) for updating an existing user's information.
+///
+/// This struct is used to send updated user details, including an optional new password,
+/// to the backend for an existing user.
+///
+/// # Fields
+/// - `id`: The unique identifier of the user to be updated.
+/// - `first_name`: The updated first name of the user.
+/// - `last_name`: The updated last name of the user.
+/// - `username`: The updated username for the user.
+/// - `make_admin`: A boolean indicating whether to grant/revoke administrator privileges.
+/// - `new_pwd`: An optional new password for the user. If empty, the password remains unchanged.
+#[derive(Deserialize, Serialize, Debug)]
+pub struct UserUpdateScheme {
+    pub id: i16,
+    pub first_name: String,
+    pub last_name: String,
+    pub username: String,
+    pub make_admin: bool,
+    pub new_pwd: String,
+}
+
+/// Represents a user entity with sensitive information filtered out.
+///
+/// This struct is used for displaying user information in contexts where
+/// the password hash or other sensitive details are not needed or should not be exposed.
+/// It's typically used for listing users or displaying user profiles.
+///
+/// # Fields
+/// - `id`: The unique identifier of the user.
+/// - `first_name`: The first name of the user.
+/// - `last_name`: The last name of the user.
+/// - `username`: The unique username of the user.
+/// - `is_admin`: A boolean indicating if the user has administrator privileges.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct FilteredUser {
+    pub id: i16,
+    pub first_name: String,
+    pub last_name: String,
+    pub username: String,
+    pub is_admin: bool,
+}
+
+/// Properties for components that display or interact with a single user.
+///
+/// This struct is used to pass the ID of a specific user to components
+/// that need to fetch, display, or modify their details.
+///
+/// # Fields
+/// - `id`: The unique identifier of the user to be displayed or acted upon.
+#[derive(Properties, PartialEq)]
+pub struct UserProps {
+    pub id: i16,
+}
+
+/// Represents an error response from the API.
+///
+/// This struct is used to deserialize error messages received from the backend API.
+/// It typically contains a human-readable message and an internal status code.
+///
+/// # Fields
+/// - `message`: A `String` containing a description of the error.
+/// - `_status`: An internal status code or message, often ignored in frontend display.
+#[derive(Deserialize, Debug)]
+struct ApiError {
+    message: String,
+    _status: String,
+}
+
+/// A component providing a form for registering new users.
+///
+/// This component allows an administrator to create new user accounts by providing
+/// their first name, last name, username, password, and specifying if they should
+/// be an administrator. The component handles form input, validation (basic),
+/// and interaction with the backend `/api/register` endpoint.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `first_name`, `last_name`, `username`, `pwd`: Values of the form input fields.
+/// - `is_admin`: Boolean state for the admin checkbox.
+/// - `status`: To display messages about registration success or errors.
+///
+/// # Form Submission
+/// - Prevents default form submission behavior.
+/// - Constructs a `UserCreateScheme` payload from the form data.
+/// - Sends a POST request to `/api/register`.
+/// - Updates the `status` state based on the API response.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <Register />
+/// }
+/// ```
+#[component(Register)]
+pub fn register_component() -> Html {
+    let first_name = use_state(|| "".to_string());
+    let last_name = use_state(|| "".to_string());
+    let username = use_state(|| "".to_string());
+    let is_admin = use_state(|| false);
+    let pwd = use_state(|| "".to_string());
+    let status = use_state(|| None::<String>);
+
+    let onsubmit = {
+        let first_name = first_name.clone();
+        let last_name = last_name.clone();
+        let username = username.clone();
+        let is_admin = is_admin.clone();
+        let pwd = pwd.clone();
+        let status = status.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+            let first_name = (*first_name).clone();
+            let last_name = (*last_name).clone();
+            let username = (*username).clone();
+            let is_admin = *is_admin;
+            let pwd = (*pwd).clone();
+            let status = status.clone();
+
+            spawn_local(async move {
+                let payload = UserCreateScheme {
+                    first_name,
+                    last_name,
+                    username,
+                    is_admin,
+                    pwd,
+                };
+
+                let request = Request::post("/api/register")
+                    .json(&payload)
+                    .expect("Error building request");
+
+                match request.send().await {
+                    Ok(response) if response.status() == 200 => status.set(Some("Erfolg".into())),
+                    Ok(response) => {
+                        let text = response.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        status.set(Some(text));
+                    }
+                    Err(err) => status.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+            });
+        })
+    };
+
+    let fn_change = {
+        let first_name = first_name.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            first_name.set(input.value());
+        })
+    };
+
+    let ln_change = {
+        let last_name = last_name.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            last_name.set(input.value());
+        })
+    };
+
+    let un_change = {
+        let username = username.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            username.set(input.value());
+        })
+    };
+
+    let admin_change = {
+        let is_admin = is_admin.clone();
+        Callback::from(move |e: Event| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            is_admin.set(input.checked());
+        })
+    };
+
+    let pwd_change = {
+        let pwd = pwd.clone();
+        Callback::from(move |e: InputEvent| {
+            let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+            pwd.set(input.value());
+        })
+    };
+
+    html! {
+        <form {onsubmit} class="rundbg">
+            <label>{ "Vorname:" }
+                <input type="text" value={(*first_name).clone()} oninput={fn_change}/>
+            </label>
+            <label>{ "Nachname:" }
+                <input type="text" value={(*last_name).clone()} oninput={ln_change}/>
+            </label>
+            <label>{ "Benutzername:" }
+                <input type="text" value={(*username).clone()} oninput={un_change}/>
+            </label>
+            <label>{ "Admin:" }
+                <input type="checkbox" checked={*is_admin} onchange={admin_change}/>
+            </label>
+            <label>{ "Password:" }
+                <input type="password" value={(*pwd).clone()} oninput={pwd_change}/>
+            </label>
+            <button type="submit">{ "Bestätigen" }</button>
+        </form>
+    }
+}
+
+/// A component providing a form for user login.
+///
+/// This component handles user authentication by collecting a username and password,
+/// then sending these credentials to the backend `/api/login` endpoint. It manages
+/// UI states for loading, errors, and success, and redirects to the home page on successful login.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `username`, `pwd`: Values of the login form input fields.
+/// - `loading`: A boolean to indicate if the login process is ongoing.
+/// - `error`: A string to display any login error messages.
+/// - `success`: A boolean to indicate if login was successful.
+///
+/// # Form Submission
+/// - Prevents default form submission behavior.
+/// - Constructs a `LoginScheme` payload from the input fields.
+/// - Sends a POST request to `/api/login`.
+/// - On successful response (HTTP 200), sets `success` to true and redirects to `crate::Route::Home`.
+/// - On error, updates the `error` state with the appropriate message.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <Login />
+/// }
+/// ```
+#[component(Login)]
+pub fn login_component() -> Html {
+    let username = use_state(|| "".to_string());
+    let pwd = use_state(|| "".to_string());
+    let loading = use_state(|| false);
+    let error = use_state(|| String::new());
+    let success = use_state(|| false);
+    let navigator = use_navigator().unwrap();
+
+    let onsubmit = {
+        let username = username.clone();
+        let pwd = pwd.clone();
+        let loading = loading.clone();
+        let error = error.clone();
+        let success = success.clone();
+        let navigator = navigator.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+            let username = (*username).clone();
+            let pwd = (*pwd).clone();
+            let loading = loading.clone();
+            let error = error.clone();
+            let success = success.clone();
+            let navigator = navigator.clone();
+
+            loading.set(true);
+            error.set(String::new());
+            success.set(false);
+
+            spawn_local(async move {
+                let payload = LoginScheme { username, pwd };
+
+                let response = Request::post("/api/login")
+                    .header("Content-Type", "application/json")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .json(&payload)
+                    .unwrap()
+                    .send()
+                    .await;
+
+                loading.set(false);
+
+                match response {
+                    Ok(r) if r.status() == 200 => {
+                        success.set(true);
+                        navigator.push(&crate::Route::Home);
+                    }
+                    Ok(r) => {
+                        let text = r.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        error.set(text);
+                    }
+                    Err(err) => error.set(format!("Netzwerkfehler: {}", err)),
+                }
+            });
+        })
+    };
+
+    html! {
+        <div>
+        <h1 class="headline">{ "Anmeldung" }</h1>
+        <form {onsubmit} class="rundbg login">
+            <input
+                placeholder="Benutzername"
+                value={(*username).clone()}
+                oninput={Callback::from(move |e: InputEvent| {
+                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                    username.set(input.value());
+                    })}
+            />
+            <input
+                type="password"
+                placeholder="Passwort"
+                value={(*pwd).clone()}
+                oninput={Callback::from(move |e: InputEvent| {
+                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                    pwd.set(input.value());
+                })}
+            />
+            <button type="submit" disabled={*loading}>{ if *loading { "Anmeldung läuft..." } else { "Anmelden" } }</button>
+            if !error.is_empty() { <p style="color:red">{(*error).clone()}</p> }
+        </form>
+        </div>
+    }
+}
+
+/// A component for fetching and displaying a list of all registered users.
+///
+/// This component retrieves a list of `FilteredUser` entities from the backend
+/// via the `/api/users` endpoint and displays them. Each user entry includes a
+/// link to view their individual details through `UserByID`.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `users`: A vector of `FilteredUser` structs to store the fetched user data.
+/// - `error`: Any error message encountered during API calls.
+/// - `loading`: A boolean indicating if user data is currently being fetched.
+///
+/// # Functionality
+/// - **Data Fetching**: On component mount, fetches all users from `/api/users`.
+/// - **Conditional Display**:
+///   - If `loading` is true, displays "Loading...".
+///   - If an `error` occurs, displays the error message.
+///   - Otherwise, renders an unordered list of users.
+/// - **Navigation**: Each user in the list is a link to [`crate::Route::UserByID`]
+///   for viewing individual user details.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <AllUsers />
+/// }
+/// ```
+#[component(AllUsers)]
+pub fn all_users_component() -> Html {
+    let users = use_state(|| Vec::<FilteredUser>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+
+    {
+        let users = users.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = format!("/api/users");
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<FilteredUser>>().await {
+                            Ok(u) => users.set(u),
+                            Err(err) => error.set(Some(format!("Parse error: {}", err))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Network error: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else {
+        html! {
+            <ul class="postits">
+            { for users.iter().map(|t| html! {
+                    <li key={t.id.to_string()} class="listbox">
+                        <Link<crate::Route> to={crate::Route::UserByID{id: t.id}}><h3>{ format!("{} {}", t.first_name, t.last_name) }</h3></Link<crate::Route>>
+                    </li>
+                })}
+            </ul>
+        }
+    }
+}
+
+/// A component for displaying, updating, and deleting a single user by their ID.
+///
+/// This component fetches a specific user's details from the backend based on the
+/// `id` provided in its `UserProps`. It allows administrators to view, modify
+/// (first name, last name, username, admin status, and password), and delete user accounts.
+///
+/// # Props
+/// - `id`: The `i16` ID of the user to fetch and display.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `user`: The fetched [`FilteredUser`] data, if available.
+/// - `error`: Any error message encountered during initial user data fetching.
+/// - `loading`: A boolean indicating if initial user data is being fetched.
+/// - `first_name`, `last_name`, `username`, `make_admin`, `new_pwd`:
+///   States for the update form fields, pre-filled with current user data.
+/// - `saving`, `save_error`, `save_success`: States for the user update operation.
+/// - `deleting`, `delete_error`: States for the user deletion operation.
+///
+/// # Functionality
+/// - **Initial Data Fetching**: On component mount or `id` change, fetches user data from
+///   `/api/users/:id`.
+/// - **Form Initialization**: Populates the update form fields with the fetched user's
+///   current details once loaded.
+/// - **User Update**: The update form sends a PATCH request to `/api/users/:id` with a
+///   `UserUpdateScheme` payload. On success, updates the displayed user data and shows a
+///   success message.
+/// - **User Deletion**: Includes a "Delete" button that, after user confirmation, sends
+///   a DELETE request to `/api/users/:id`. On success, clears the user from display.
+/// - **Error Handling**: Displays error messages for various API and network issues.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <UserByID id={42} />
+/// }
+/// ```
+#[component(UserByID)]
+pub fn user_by_id_component(props: &UserProps) -> Html {
+    let user = use_state(|| None::<FilteredUser>);
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+    let id = props.id;
+
+    {
+        let user = user.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with(id, move |id_ref| {
+            loading.set(true);
+            let user = user.clone();
+            let error = error.clone();
+            let id = *id_ref;
+            spawn_local(async move {
+                let url = format!("/api/users/{}", id);
+
+                match Request::get(&url).send().await {
+                    Ok(response) => {
+                        let status = response.status();
+                        if status == 200 {
+                            match response.json::<FilteredUser>().await {
+                                Ok(u) => user.set(Some(u)),
+                                Err(err) => error.set(Some(format!("Parse error: {}", err))),
+                            }
+                        } else {
+                            match response.json::<ApiError>().await {
+                                Ok(ae) => error.set(Some(ae.message)),
+                                Err(_) => {
+                                    if let Ok(text) = response.text().await {
+                                        error.set(Some(text));
+                                    } else {
+                                        error.set(Some(format!("Server error: {}", status)));
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Network error: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    let first_name = use_state(|| "".to_string());
+    let last_name = use_state(|| "".to_string());
+    let username = use_state(|| "".to_string());
+    let make_admin = use_state(|| false);
+    let new_pwd = use_state(|| String::new());
+    let saving = use_state(|| false);
+    let save_error = use_state(|| None::<String>);
+    let save_success = use_state(|| false);
+
+    {
+        let user = user.clone();
+        let first_name = first_name.clone();
+        let last_name = last_name.clone();
+        let username = username.clone();
+        let make_admin = make_admin.clone();
+
+        use_effect_with(user, move |user_ref| {
+            if let Some(u) = &**user_ref {
+                first_name.set(u.first_name.clone());
+                last_name.set(u.last_name.clone());
+                username.set(u.username.clone());
+                make_admin.set(u.is_admin);
+            }
+            || ()
+        });
+    }
+
+    let onsubmit = {
+        let first_name = first_name.clone();
+        let last_name = last_name.clone();
+        let username = username.clone();
+        let make_admin = make_admin.clone();
+        let new_pwd = new_pwd.clone();
+        let saving = saving.clone();
+        let save_error = save_error.clone();
+        let save_success = save_success.clone();
+        let user_state = user.clone();
+
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+            let first_name = (*first_name).clone();
+            let last_name = (*last_name).clone();
+            let username = (*username).clone();
+            let make_admin = *make_admin;
+            let new_pwd_state = new_pwd.clone();
+            let new_pwd = (*new_pwd).clone();
+
+            saving.set(true);
+            save_error.set(None);
+            save_success.set(false);
+
+            let saving = saving.clone();
+            let save_error = save_error.clone();
+            let save_success = save_success.clone();
+            let user_state = user_state.clone();
+            let id = id;
+
+            spawn_local(async move {
+                let payload = UserUpdateScheme {
+                    id: id,
+                    first_name,
+                    last_name,
+                    username,
+                    make_admin,
+                    new_pwd,
+                };
+
+                let url = format!("/api/users/{}", id);
+                let request = Request::patch(&url)
+                    .header("Content-Type", "application/json")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .json(&payload)
+                    .expect("Failed to construct Request");
+
+                match request.send().await {
+                    Ok(resp) if resp.status() == 200 => {
+                        if let Ok(updated) = resp.json::<FilteredUser>().await {
+                            user_state.set(Some(updated));
+                        }
+                        new_pwd_state.set(String::new());
+                        save_success.set(true);
+                    }
+                    Ok(resp) => {
+                        let txt = resp.text().await.unwrap_or_else(|_| "Unknown".into());
+                        save_error.set(Some(format!("HTTP {}: {}", resp.status(), txt)));
+                    }
+                    Err(err) => save_error.set(Some(format!("Network error: {}", err))),
+                }
+                saving.set(false);
+            });
+        })
+    };
+
+    let deleting = use_state(|| false);
+    let delete_error = use_state(|| None::<String>);
+
+    let ondelete = {
+        let deleting = deleting.clone();
+        let delete_error = delete_error.clone();
+        let user_state = user.clone(); // or ticket
+        let id = id;
+
+        Callback::from(move |e: MouseEvent| {
+            e.prevent_default();
+            // confirm
+            if !web_sys::window()
+                .and_then(|w| {
+                    w.confirm_with_message("Möchten Sie diesen Eintrag wirklich löschen?")
+                        .ok()
+                })
+                .unwrap_or(false)
+            {
+                return;
+            }
+
+            deleting.set(true);
+            delete_error.set(None);
+
+            let deleting = deleting.clone();
+            let delete_error = delete_error.clone();
+            let user_state = user_state.clone();
+
+            spawn_local(async move {
+                let url = format!("/api/users/{}", id);
+                let req = Request::delete(&url).credentials(web_sys::RequestCredentials::Include);
+
+                match req.send().await {
+                    Ok(resp) if resp.status() == 200 || resp.status() == 204 => {
+                        user_state.set(None);
+                    }
+                    Ok(resp) => {
+                        let txt = resp.text().await.unwrap_or_else(|_| "Unbekannt".into());
+                        delete_error.set(Some(txt));
+                    }
+                    Err(err) => delete_error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+                deleting.set(false);
+            });
+        })
+    };
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else if let Some(u) = &*user {
+        html! {
+            <div class="rundbg">
+                <div>
+                    <p><strong>{ "Vorname: " }</strong>{ &u.first_name }</p>
+                    <p><strong>{ "Nachname: " }</strong>{ &u.last_name }</p>
+                    <p><strong>{ "Benutzername: " }</strong>{ &u.username }</p>
+                    <p><strong>{ "Ist Admin: " }</strong>{ u.is_admin }</p>
+                </div>
+
+                <crate::pages::qr::QrManager user_id={u.id}/>
+
+                <form onsubmit={onsubmit}>
+                    <div>
+                        <label>{ "Vorname" }
+                            <input name="first_name"
+                                value={(*first_name).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    first_name.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+                    <div>
+                        <label>{ "Nachname" }
+                            <input name="last_name"
+                                value={(*last_name).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    last_name.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+                    <div>
+                        <label>{ "Benutzername" }
+                            <input name="username"
+                                value={(*username).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    username.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+                    <div>
+                        <label>{ "Ist Admin" }
+                            <input type="checkbox" name="make_admin" checked={*make_admin} onchange={Callback::from(move |e: Event| {
+                                let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                make_admin.set(input.checked());
+                            })}/>
+                        </label>
+                    </div>
+                    <div>
+                        <label>{ "Neues Passwort (leer = unchanged)" }
+                            <input name="new_pwd" type="password"
+                                value={(*new_pwd).clone()}
+                                oninput={Callback::from(move |e: InputEvent| {
+                                    let input: web_sys::HtmlInputElement = e.target_unchecked_into();
+                                    new_pwd.set(input.value());
+                                })}
+                            />
+                        </label>
+                    </div>
+
+                    <button type="submit" disabled={*saving}>{ if *saving { "Speichern..." } else { "Speichern" } }</button>
+                    if *save_success {
+                        <p style="color:green">{ "Erfolgreich aktualisiert" }</p>
+                    }
+                    if let Some(err) = &*save_error {
+                        <p style="color:red">{ err.clone() }</p>
+                    }
+                </form>
+
+                <button onclick={ondelete} disabled={*deleting}>
+                    {if *deleting {"Löschen..."} else {"Löschen"}}
+                </button>
+
+                <Link<crate::Route> to={crate::Route::AllUsers}>{ "Zurück zur Benutzerübersicht" }</Link<crate::Route>>
+                if let Some(err) = &*delete_error {
+                    <p style="color:red">{ err.clone() }</p>
+                }
+            </div>
+        }
+    } else {
+        html! { <p>{ "Kein Benutzer gefunden." }</p> }
+    }
+}

frontend/src/pages/utilities.rs

@@ -0,0 +1,481 @@
+use std::collections::HashMap;
+
+use chrono::{DateTime, Datelike, Utc};
+use gloo_net::http::Request;
+use serde::Deserialize;
+use wasm_bindgen_futures::spawn_local;
+use yew::prelude::*;
+
+use crate::pages::ticket::{ActiveUser, Ticket};
+
+/// A partial representation of a ticket, containing only the fields necessary for statistical analysis.
+///
+/// This struct is used to efficiently retrieve and process ticket data for diagnostics
+/// without fetching the full ticket details.
+///
+/// # Fields
+/// - `date`: The creation date and time of the ticket in UTC.
+/// - `room`: The room number associated with the ticket.
+#[derive(Debug, Deserialize, Clone, PartialEq)]
+struct TicketPartial {
+    date: DateTime<Utc>,
+    room: i16,
+}
+
+/// Properties for components that display room-wise ticket totals.
+///
+/// This struct passes a list of partial ticket data to a component responsible
+/// for calculating and visualizing ticket distribution per room.
+///
+/// # Fields
+/// - `tickets`: A vector of [`TicketPartial`] containing ticket data relevant for room totals.
+#[derive(Properties, PartialEq)]
+struct RoomTotalsProps {
+    tickets: Vec<TicketPartial>,
+}
+
+/// Converts a `chrono::DateTime<Utc>` object's weekday to a 0-indexed integer.
+///
+/// This function maps `chrono::Weekday` values (where Monday is 1, Sunday is 7)
+/// to a 0-indexed system (Monday = 0, Sunday = 6).
+///
+/// # Arguments
+/// - `dt`: A reference to a `DateTime<Utc>` object.
+///
+/// # Returns
+/// A `usize` representing the weekday index (0 for Monday, ..., 6 for Sunday).
+fn weekday_index(dt: &DateTime<Utc>) -> usize {
+    // chrono::Weekday: Mon = 1 ... Sun = 7
+    match dt.weekday() {
+        chrono::Weekday::Mon => 0,
+        chrono::Weekday::Tue => 1,
+        chrono::Weekday::Wed => 2,
+        chrono::Weekday::Thu => 3,
+        chrono::Weekday::Fri => 4,
+        chrono::Weekday::Sat => 5,
+        chrono::Weekday::Sun => 6,
+    }
+}
+
+/// Counts the number of tickets submitted on each day of the week.
+///
+/// This function takes a slice of `TicketPartial` and returns an array where each
+/// element corresponds to a day of the week (Monday=0, Sunday=6) and contains
+/// the total count of tickets submitted on that day.
+///
+/// # Arguments
+/// - `tickets`: A slice of [`TicketPartial`] items to count.
+///
+/// # Returns
+/// An array `[usize; 7]` with ticket counts for each weekday.
+fn count_by_weekday(tickets: &[TicketPartial]) -> [usize; 7] {
+    let mut counts = [0usize; 7];
+    for t in tickets {
+        counts[weekday_index(&t.date)] += 1;
+    }
+    counts
+}
+
+/// Calculates the occurrences of each weekday within the date range covered by the tickets.
+///
+/// This function determines the minimum and maximum dates from the provided [`TicketPartial`]
+/// slice and then counts how many times each weekday occurs within that inclusive date range.
+/// This is useful for normalizing ticket counts against the number of available days for each weekday.
+///
+/// # Arguments
+/// - `partials`: A slice of [`TicketPartial`] items defining the date range.
+///
+/// # Returns
+/// An array `[usize; 7]` where each element represents the number of times a
+/// specific weekday (Monday=0, ..., Sunday=6) appears in the date range.
+fn day_counts(partials: &[TicketPartial]) -> [usize; 7] {
+    if partials.is_empty() {
+        return [0usize; 7];
+    }
+
+    let mut min = partials[0].date.date_naive();
+    let mut max = min;
+    for d in partials.iter().skip(1) {
+        let dt = d.date.date_naive();
+        if dt < min {
+            min = dt
+        }
+        if dt > max {
+            max = dt
+        }
+    }
+
+    let total_days = (max - min).num_days() + 1;
+    if total_days <= 0 {
+        return [0usize; 7];
+    }
+
+    let mut occ = [0usize; 7];
+    let mut current = min;
+    for _ in 0..total_days {
+        let wd = current.weekday();
+        let idx = match wd {
+            chrono::Weekday::Mon => 0,
+            chrono::Weekday::Tue => 1,
+            chrono::Weekday::Wed => 2,
+            chrono::Weekday::Thu => 3,
+            chrono::Weekday::Fri => 4,
+            chrono::Weekday::Sat => 5,
+            chrono::Weekday::Sun => 6,
+        };
+        occ[idx] += 1;
+        current = current + chrono::Duration::days(1);
+    }
+
+    occ
+}
+
+/// Converts a numerical room representation back into a human-readable string format.
+///
+/// This function is the inverse of the room parsing logic in
+/// [`SubmitTicket`](`crate::pages::ticket::SubmitTicket`) component.
+/// It converts negative numbers back to "K" prefixed rooms, numbers >= 1000 back to "D" prefixed rooms,
+/// and other numbers to their string representation.
+///
+/// # Arguments
+/// - `r`: An `i16` representing the internal numerical representation of a room.
+///
+/// # Returns
+/// A `String` containing the formatted room number (e.g., "K1", "D1", "101").
+fn parse_room(r: i16) -> String {
+    if r < 0 {
+        format!("K{}", r.abs())
+    } else if r > 1000 {
+        format!("D{}", r - 1000)
+    } else {
+        r.to_string()
+    }
+}
+
+/// The main diagnostics dashboard component.
+///
+/// This component serves as a container for various statistical and diagnostic
+/// views related to the application's tickets.
+///
+/// # Components Rendered
+/// - [`TicketCount`]: Displays the count of open tickets.
+/// - [`SubmitStats`]: Displays statistics related to ticket submissions (e.g., by weekday, by room).
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <Diagnostics />
+/// }
+/// ```
+#[component(Diagnostics)]
+pub fn diagnostics_component() -> Html {
+    html! {
+        <div class="rundbg">
+            <TicketCount/>
+            <SubmitStats/>
+        </div>
+    }
+}
+
+/// A component that displays the count of currently open (ToDo or InProgress) tickets.
+///
+/// This component fetches all tickets and the current user's details. It then filters
+/// the tickets to count only those that are "ToDo" or "InProgress" and are either
+/// created by the current user (for non-admins) or all tickets (for admins).
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `tickets`: A vector of `Ticket` structs for all fetched tickets.
+/// - `error`: Any error message from API calls.
+/// - `loading`: A boolean indicating if data is being fetched.
+/// - `user`: The `ActiveUser` details for conditional filtering.
+///
+/// # Functionality
+/// - Fetches all tickets from `/api/tickets`.
+/// - Fetches current user details from `/api/users/current`.
+/// - Filters tickets by status ("ToDo" or "InProgress") and user ID (if not admin).
+/// - Displays the count of matching tickets.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <TicketCount />
+/// }
+/// ```
+#[component(TicketCount)]
+pub fn ticket_count_component() -> Html {
+    let tickets = use_state(|| Vec::<Ticket>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+    let user = use_state(|| ActiveUser {
+        id: None,
+        is_admin: false,
+    });
+
+    {
+        let tickets = tickets.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = format!("/api/tickets");
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<Ticket>>().await {
+                            Ok(t) => tickets.set(t),
+                            Err(e) => error.set(Some(format!("Parsefehler: {}", e))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("Status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    {
+        let user = user.clone();
+        use_effect_with((), move |_| {
+            let user = user.clone();
+            spawn_local(async move {
+                if let Ok(response) = Request::get("/api/users/current")
+                    .credentials(web_sys::RequestCredentials::Include)
+                    .send()
+                    .await
+                {
+                    if response.status() == 200 {
+                        if let Ok(json) = response.json::<serde_json::Value>().await {
+                            let id = json
+                                .get("data")
+                                .and_then(|d| d.get("id"))
+                                .and_then(|v| v.as_i64())
+                                .and_then(|n| i16::try_from(n).ok());
+                            let is_admin = json
+                                .get("data")
+                                .and_then(|d| d.get("is_admin"))
+                                .and_then(|v| v.as_bool())
+                                .unwrap_or(false);
+                            user.set(ActiveUser { id, is_admin });
+                        }
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    if *loading {
+        html! {<p>{ "Wird geladen" }</p>}
+    } else if let Some(e) = &*error {
+        html! { <p>{ format!("Fehler: {}", e) }</p> }
+    } else {
+        let status_conditions = |t: &Ticket| t.status == "ToDo" || t.status == "InProgress";
+        let count = tickets
+            .iter()
+            .filter(|t| {
+                status_conditions(t)
+                    && (user.is_admin || user.id.map_or(false, |uid| t.user_id == uid))
+            })
+            .count();
+        html! {
+            <div class="ticket-count">
+                <h2>{ "Offene Tickets" }</h2>
+                <h4>{ count }</h4>
+            </div>
+        }
+    }
+}
+
+/// A component that displays various statistics about ticket submissions.
+///
+/// This component fetches all tickets (in a partial format for efficiency)
+/// and calculates statistics such as tickets per weekday and tickets per room.
+/// It renders these statistics visually using simple bar charts.
+///
+/// # State
+/// Uses `use_state` hooks to manage:
+/// - `tickets`: A vector of [`TicketPartial`] for statistical analysis.
+/// - `error`: Any error message from API calls.
+/// - `loading`: A boolean indicating if data is being fetched.
+///
+/// # Functionality
+/// - Fetches all tickets (as [`TicketPartial`]) from `/api/tickets`.
+/// - Calculates:
+///   - `counts`: Number of tickets submitted on each weekday.
+///   - `occ`: Number of occurrences of each weekday in the ticket date range.
+///   - `avg`: Average number of tickets per day for each weekday, normalized by `occ`.
+/// - Renders a bar chart for average tickets per weekday.
+/// - Renders a [`RoomTotalTickets`] component to display tickets per room.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <SubmitStats />
+/// }
+/// ```
+#[component(SubmitStats)]
+pub fn submit_stats_component() -> Html {
+    let tickets = use_state(|| Vec::<TicketPartial>::new());
+    let error = use_state(|| None::<String>);
+    let loading = use_state(|| false);
+
+    {
+        let tickets = tickets.clone();
+        let error = error.clone();
+        let loading = loading.clone();
+
+        use_effect_with((), move |_| {
+            loading.set(true);
+            spawn_local(async move {
+                let url = "/api/tickets".to_string();
+                match Request::get(&url).send().await {
+                    Ok(response) if response.status() == 200 => {
+                        match response.json::<Vec<TicketPartial>>().await {
+                            Ok(t) => tickets.set(t),
+                            Err(e) => error.set(Some(format!("Parsefehler: {}", e))),
+                        }
+                    }
+                    Ok(response) => {
+                        if let Ok(text) = response.text().await {
+                            error.set(Some(text));
+                        } else {
+                            error.set(Some(format!("Status {}", response.status())));
+                        }
+                    }
+                    Err(err) => error.set(Some(format!("Netzwerkfehler: {}", err))),
+                }
+                loading.set(false);
+            });
+            || ()
+        });
+    }
+
+    let counts = count_by_weekday(&tickets);
+    let occ = day_counts(&tickets);
+
+    let mut avg = [0.0f64; 7];
+    for i in 0..7 {
+        if occ[i] > 0 {
+            avg[i] = counts[i] as f64 / occ[i] as f64;
+        } else {
+            avg[i] = 0.0;
+        }
+    }
+
+    let weekdays = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"];
+    let (max_idx, _max_val) = counts
+        .iter()
+        .enumerate()
+        .max_by(|a, b| a.1.partial_cmp(b.1).unwrap())
+        .map(|(i, _)| (i, ()))
+        .unwrap_or((0, ()));
+
+    html! {
+        <div class="diagnostics-section">
+            if *loading {
+                <p>{ "Wird geladen..." }</p>
+            }
+            if let Some(e) = &*error {
+                <p style="color: red;">{ e.clone() }</p>
+            }
+            <h3>{ "Tickets pro Wochentag" }</h3>
+            <div class="weekday-chart">
+                <div class="weekday-bars">
+                    { for (0..7).map(|i| {
+                        let is_max = i == max_idx;
+                        let max_value = counts.iter().cloned().max().unwrap_or(1).max(1);
+                        let bar_height_percent = if max_value > 0 { (avg[i] / max_value as f64) * 100.0 } else { 0.0 };
+                        let bar_height_px = (bar_height_percent * 200.0 / 100.0) as i32;
+                        html! {
+                            <div class="weekday-bar">
+                                <div class={format!("bar{}", if is_max { " max" } else { "" })} style={format!("height: {}px;", bar_height_px)}>
+                                </div>
+                            </div>
+                        }
+                    })}
+                </div>
+                <div class="weekday-labels">
+                    { for (0..7).map(|i| {
+                        html! {
+                            <div class="label-item">
+                                <div class="day">{ weekdays[i] }</div>
+                                <div class="value">{ format!("{:.1}", avg[i]) }</div>
+                            </div>
+                        }
+                    })}
+                </div>
+            </div>
+            <RoomTotalTickets tickets={(*tickets).clone()}/>
+        </div>
+    }
+}
+
+/// A component that displays the total number of tickets per room.
+///
+/// This component takes a list of [`TicketPartial`] items and calculates the
+/// total number of tickets for each room. It then displays these totals
+/// in a sorted list with a bar chart visualization.
+///
+/// # Props
+/// - `tickets`: A `Vec<TicketPartial>` containing the partial ticket data for analysis.
+///
+/// # Functionality
+/// - **Calculates Totals**: Aggregates ticket counts for each unique room.
+/// - **Sorts Results**: Displays rooms sorted by ticket count in descending order.
+/// - **Visualizes Data**: Renders a bar chart where the width of each bar is
+///   proportional to the ticket count for that room, relative to the room with the maximum tickets.
+/// - **Room Formatting**: Uses the [`parse_room`] function to display room numbers
+///   in a human-readable format.
+///
+/// # Example
+/// ```rust
+/// html! {
+///     <RoomTotalTickets tickets={my_ticket_partials} />
+/// }
+/// ```
+#[component(RoomTotalTickets)]
+fn room_total_component(props: &RoomTotalsProps) -> Html {
+    let mut totals: HashMap<i16, usize> = HashMap::new();
+    for t in &props.tickets {
+        *totals.entry(t.room).or_insert(0) += 1;
+    }
+
+    let mut totals_vec: Vec<(i16, usize)> = totals.into_iter().collect();
+    totals_vec.sort_by(|a, b| b.1.cmp(&a.1));
+
+    let max_count = totals_vec.iter().map(|(_, c)| *c).max().unwrap_or(1).max(1);
+
+    html! {
+        <div class="diagnostics-section">
+            <h3>{ "Tickets pro Raum" }</h3>
+            <div class="room-chart">
+                { for totals_vec.into_iter().map(|(room, count)| {
+                    let label = parse_room(room);
+                    let bar_width_percent = (count as f64 / max_count as f64) * 100.0;
+                    html! {
+                        <div class="room-bar-item">
+                            <div class="room-header">
+                                <span class="room-label">{ label }</span>
+                                <span class="room-count">{ count }</span>
+                            </div>
+                            <div class="room-bar-container">
+                                <div class="room-bar" style={format!("width: {}%;", bar_width_percent)}>
+                                </div>
+                            </div>
+                        </div>
+                    }
+                }) }
+            </div>
+        </div>
+    }
+}

frontend/src/styles/_mixins.scss

@@ -0,0 +1,8 @@
+@use "variables" as *;
+
+@mixin card {
+  backgroud: #fff;
+  border-radius: &border-radius;
+  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
+  padding: var(--spacing-md);
+}

frontend/src/styles/_utilities.scss

@@ -0,0 +1,6 @@
+@use "variables" as *;
+
+.u-hidden { display: none !important; }
+.u-gap-sm { gap: var(--spacing-sm); }
+.text-muted { color: var(--color-muted); }
+

frontend/src/styles/_variables.scss

@@ -0,0 +1,34 @@
+:root {
+  --color-bg: #ffffff;
+  --color-sidebar: #570000;
+  --color-accent: #2563eb;
+  --color-muted: #6b7280;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --border-radius: 6px;
+  --rundbgbackgroundcolor: #a0a0a0;
+  --sidebar-font: #fffefe;
+  --color: #000000;
+  --color-container: #f0f0f0;
+  --color-text: #000000;
+  --color-placeholder: #757575;
+  --color-input: #1a1a1a;
+}
+
+[data-theme='dark'] {
+  --color-bg: #000000;
+  --color-sidebar: #b7d300;
+  --color-accent: #eb2525;
+  --color-muted: #999999;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --border-radius: 6px;
+  --rundbgbackgroundcolor: #505050;
+  --sidebar-font: #000000;
+  --color: #000000;
+  --color-container: #1a1a1a;
+  --color-text: #000000;
+  --color-placeholder: #a0a0a0;
+  --color-input: #f0f0f0;
+}
+

frontend/src/styles/components/_darkmode.scss

@@ -0,0 +1,27 @@
+ body {
+	/* Formular Styles */
+	input, textarea, select, button {
+	  width: 100%;
+	  margin-top: 1rem;
+	  padding: 0.75rem;
+	  font-size: 1rem;
+	  border-radius: 0.5rem;
+	  color: var(--color-input);
+	  border: none;
+	  cursor: pointer;
+	  margin-bottom: 15px;
+	}
+
+	input::placeholder,
+	textarea::placeholder {
+	  color: var(--color-placeholder);
+	  opacity: 1;
+	}
+	
+	button:hover  {
+	  cursor: pointer;
+	  border: none;
+	  transition: all 0.2s ease-in-out;
+	  margin-bottom: 15px;
+	}
+ }

frontend/src/styles/components/_diagnostics.scss

@@ -0,0 +1,138 @@
+@use "../mixins" as *;
+@use "../variables" as *;
+
+.diagnostics-container {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-md);
+}
+
+.diagnostics-section {
+  background-color: #ffffff;
+  border-radius: var(--border-radius);
+  padding: var(--spacing-md);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
+
+  h3 {
+    margin: 0 0 var(--spacing-md) 0;
+    color: #1f2937;
+    font-size: 1.1rem;
+    font-weight: 600;
+  }
+}
+
+.weekday-chart {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  border: 1px solid #e5e7eb;
+  border-radius: var(--border-radius);
+  background-color: #f9fafb;
+}
+
+.weekday-bars {
+  display: flex;
+  gap: 12px;
+  align-items: flex-end;
+  height: 205px;
+  padding: var(--spacing-md);
+  overflow-x: auto;
+  padding-bottom: 0px;
+}
+
+.weekday-bar {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  flex: 1;
+  min-width: 60px;
+  height: 100%;
+  justify-content: end;
+
+  .bar {
+    width: 100%;
+    background-color: var(--color-accent);
+    border-radius: 4px 4px 0 0;
+    transition: background-color 0.2s ease;
+
+    &.max {
+      background-color: #10b981;
+    }
+  }
+}
+
+.weekday-labels {
+  display: flex;
+  gap: 12px;
+  padding: var(--spacing-md);
+  padding-top: 0;
+  overflow-x: auto;
+
+  .label-item {
+    flex: 1;
+    min-width: 60px;
+    text-align: center;
+    white-space: nowrap;
+
+    .day {
+      font-weight: 600;
+      font-size: 12px;
+      color: #1f2937;
+      margin-bottom: 2px;
+    }
+
+    .value {
+      font-size: 11px;
+      color: var(--color-muted);
+    }
+  }
+}
+
+.room-chart {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  padding: var(--spacing-md);
+  border: 1px solid #e5e7eb;
+  border-radius: var(--border-radius);
+  background-color: #f9fafb;
+}
+
+.room-bar-item {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+
+  .room-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+
+    .room-label {
+      font-weight: 600;
+      font-size: 14px;
+      color: #1f2937;
+      min-width: 50px;
+    }
+
+    .room-count {
+      font-size: 12px;
+      color: var(--color-muted);
+      font-weight: 500;
+    }
+  }
+
+  .room-bar-container {
+    width: 100%;
+    height: 24px;
+    background-color: #e5e7eb;
+    border-radius: 4px;
+    overflow: hidden;
+
+    .room-bar {
+      height: 100%;
+      background-color: #570000;
+      transition: width 0.3s ease;
+    }
+  }
+}

frontend/src/styles/components/_frontpage.scss

@@ -0,0 +1,7 @@
+.headline {
+    font-size: 40px;
+    font-weight: bold;
+    text-align: center;
+    color: #570000;
+    margin-top: 150px;
+}   

frontend/src/styles/components/_home.scss

@@ -0,0 +1,9 @@
+.login-status {
+  font-weight: bold;
+  margin: 4px 8px;
+}
+
+.name {
+  font-size: 24px;
+  margin: 4px 8px;
+}

frontend/src/styles/components/_icon.scss

@@ -0,0 +1,27 @@
+.csg-icon {
+  position: fixed;
+  top: 1rem;
+  right: 1rem;
+  z-index: 9999;
+  width: auto;
+  height: auto;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0;
+
+  @media (max-width: 768px) {
+    max-width: 60px;
+    
+    img {
+      width: 100%;
+      height: auto;
+    }
+  }
+
+  img {
+    width: auto;
+    height: auto;
+  }
+}
+

frontend/src/styles/components/_sidebar.scss

@@ -0,0 +1,194 @@
+@use "../variables" as *;
+@use "../mixins" as *;
+
+
+:root {
+  color-scheme: dark light;
+}
+
+.sidebar {
+  width: 260px;
+  background: var(--color-sidebar);
+  color: var(--sidebar-font);
+  min-height: 100%;
+  padding: var(--spacing-md);
+  display: flex;
+  flex-direction: column;
+
+ 
+
+  ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--spacing-sm); flex: 1; }
+
+  a, .menu-toggle {
+    color: var(--sidebar-font);
+    text-decoration: none;
+    display: block;
+    padding: 8px 12px;
+    border-radius: var(--border-radius);
+    transition: background 0.2s ease-in-out;
+    &:hover { background: rgba(255,255,255,0.1); }
+  }
+
+  .menu-toggle { background: transparent; border: none; text-align: left; width: 100%; cursor: pointer; }
+
+  .submenu {
+    margin-left: 8px;
+    background: rgba(255,255,255,0.05);
+    border-radius: var(--border-radius);
+    padding: 6px;
+    li { padding: 4px 0; }
+  }
+
+  .logout-item {
+    margin-top: auto;
+    border-top: 1px solid rgba(255,255,255,0.1);
+    padding-top: var(--spacing-sm);
+  }
+
+  .sidebar-button {
+    background: rgba(255, 93, 43, 0.527);
+    color: var(--sidebar-font);
+    border: 1px solid rgba(255, 255, 255, 0.801);
+    padding: 8px 12px;
+    border-radius: 4px;
+    width: 100%;
+    cursor: pointer;
+    text-align: left;
+    margin-top: var(--spacing-sm);
+
+    &.theme-toggle-btn {
+      display: flex;
+      justify-content: center;
+      align-items: center;
+    }
+  }
+
+  .sidebar-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    width: 100%;
+    margin-bottom: var(--spacing-md);
+
+    .home {
+      flex-grow: 1;
+      display: flex;
+      justify-content: center;
+      
+      @media (max-width: 768px) {
+        padding-left: 36px;
+      }
+    }
+
+    .sidebar-close {
+      display: none;
+      background: transparent;
+      border: none;
+      color: var(--sidebar-font);
+      cursor: pointer;
+      padding: 8px;
+      border-radius: 50%;
+      align-items: center;
+      justify-content: center;
+      transition: background 0.2s ease-in-out;
+      margin-bottom: 0;
+
+      &:hover {
+        background: rgba(255, 255, 255, 0.1);
+      }
+
+      svg {
+        width: 20px;
+        height: 20px;
+        stroke: var(--sidebar-font);
+      }
+
+      @media (max-width: 768px) {
+        display: flex;
+      }
+    }
+  }
+  
+  .home-svg {
+    width: 24px;
+    height: 24px; 
+    vertical-align: middle;
+    margin-right: 8px;
+  }
+
+  &.user { width: 220px; background: darken(#570000, 6%); }
+}
+
+// Floating mobile menu toggle button
+.mobile-menu-toggle {
+  display: none;
+  
+  @media (max-width: 768px) {
+    display: flex;
+    position: fixed;
+    top: 1rem;
+    left: 1rem;
+    z-index: 999;
+    width: 48px;
+    height: 48px;
+    border-radius: 50%;
+    border: 1px solid rgba(128, 128, 128, 0.2);
+    background-color: var(--color-container);
+    color: var(--color-text);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+    cursor: pointer;
+    align-items: center;
+    justify-content: center;
+    padding: 0;
+    transition: all 0.2s ease-in-out;
+    
+    svg {
+      width: 24px;
+      height: 24px;
+      stroke: var(--color-text);
+      transition: stroke 0.2s ease-in-out;
+    }
+    
+    &:hover {
+      transform: translateY(-1px);
+      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
+      background-color: var(--color-bg);
+      color: var(--color-container);
+      
+      svg {
+        stroke: var(--color-container);
+      }
+    }
+    
+    &:active {
+      transform: translateY(0);
+    }
+  }
+}
+
+// Overlay backdrop that dims the screen and allows dismissals on mobile
+.sidebar-overlay {
+  display: none;
+  
+  @media (max-width: 768px) {
+    display: block;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    background: rgba(0, 0, 0, 0.4);
+    backdrop-filter: blur(4px);
+    z-index: 999;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s ease-in-out;
+    
+    &.open {
+      opacity: 1;
+      pointer-events: auto;
+    }
+  }
+
+}
+

frontend/src/styles/components/_tickets.scss

@@ -0,0 +1,79 @@
+@use "../mixins" as *;
+@use "../variables" as *;
+
+.ticket-card {
+  @include card();
+  border-left: 4px solid var(--color-accent);
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-sm);
+
+  .meta { color: var(--color-muted); font-size: 0.9rem; }
+  .title { font-weight: 600; }
+
+}
+
+.listbox {
+  max-width: auto;
+  margin:0 0;
+  background-color: #90ff82;
+  background-color: var(--rundbgbackgroundcolor);
+  padding-bottom: 8px;
+  color: white;
+  padding-left: 8px;
+  padding-right: 8px;
+  padding-top: 8px;
+  border-radius: 20px;
+  border-color: #000000;
+  border-style: double;
+  box-shadow: 10px 10px 10px rgba(43, 43, 43, 0.8);
+  font-size: 26px;
+  list-style-type: none;
+  text-align: center;
+
+  
+  &.To-Do {
+    background-color: #b1003b;
+  }
+
+  &.InProgress {
+    background-color: #fff385;
+  }
+
+  &.Completed {
+    background-color: #90ff82;
+  }
+
+  &.Archived {
+    background-color: #af69ee;
+  }
+
+  a {
+    text-decoration: none;
+    color: white;
+  }
+}
+
+.postits {
+  display: grid;
+  gap: 8px;
+  margin-top: 96px; 
+}
+.warning {
+  color: #570000;
+}
+
+.ticket-count {
+  border-radius: 10px;
+  border: 2px solid black;
+  width: fit-content;
+  padding: 8px;
+  margin: 0 auto;
+  margin-bottom: 32px;
+
+  h4 {
+    text-align: center;
+    font-size: 32px;
+    margin: 8px;
+  }
+}

frontend/src/styles/main.scss

@@ -0,0 +1,139 @@
+@use "variables";
+@use "mixins";
+@use "utilities";
+@use "components/sidebar";
+@use "components/tickets";
+@use "components/diagnostics";
+@use "components/frontpage";
+@use "components/home";
+@use "components/icon";
+
+body {
+  background: var(--color-bg);
+  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
+  color: #111827;
+  margin: 0;
+}
+
+.admin { display: flex; }
+
+.layout {
+  display: flex;
+  height: 100vh;
+  overflow: hidden;
+  box-sizing: border-box;
+}
+
+.sidebar {
+  width: 260px;
+  flex-shrink: 0;
+  position: fixed;
+  left: 0;
+  top: 0;
+  height: 100vh;
+  overflow-y: auto;
+  box-sizing: border-box;
+}
+
+.content {
+  flex: 1;
+  min-width: 0;
+  margin-left: 260px;
+  height: 100%;
+  overflow-y: auto;
+  padding: var(--spacing-md);
+  box-sizing: border-box;
+}
+
+@media (max-width: 768px) {
+  .sidebar {
+    position: fixed;
+    top: 0;
+    bottom: 0;
+    left: -260px;
+    transition: left .3s ease-in-out;
+    z-index: 1000;
+    height: 100%;
+    box-sizing: border-box;
+  }
+  .sidebar.open { left: 0; }
+  .content { margin-left: 0; padding: var(--spacing-md); box-sizing: border-box; }
+}
+
+.rundbg {
+  display: flex;
+  justify-content: center;
+  flex-direction: column;
+  max-width: 60%;
+  margin: 0 auto;
+  background-color: var(--rundbgbackgroundcolor);
+  padding-bottom: 96px;
+  padding-left: 32px;
+  padding-right: 32px;
+  padding-top: 96px;
+  border-radius: 20px;
+  gap: 8px;
+  border-color: #000000;
+  border-style: double;
+  box-shadow: 20px 20px 10px rgb(43, 43, 43);
+  font-size: 26px;
+  
+  label {
+    display: block;
+    width: 100%;
+    box-sizing: border-box;
+  }
+
+  input, select, button, a {
+    width: 100%;
+    box-sizing: border-box;
+    padding: 16px;
+    font-size: 1.8rem;
+    background-color: #f0f0f0;
+    color: var(--color-input);
+    box-shadow: #6d6d6d;
+    box-shadow: 6px 6px 8px;
+  }
+
+
+  input[type="checkbox"] {
+    width: auto;
+  }
+
+  button {
+    margin: 16px 0;
+  }
+
+  a {
+    color: var (--color);
+    text-align: center;
+    border-style: dashed;
+  }
+
+  &.login {
+    margin-top: 96px;
+    max-width: 40%;
+  }
+
+  &.home {
+    padding-top: 16px;
+  }
+}
+
+.setup-form input {
+  width: 100%;
+  box-sizing: border-box;
+}
+
+input, select, textarea {
+  color: var(--color-input);
+}
+
+input::placeholder,
+textarea::placeholder {
+  color: var(--color-placeholder);
+  opacity: 1;
+}
+
+
+

src/lib.rs

@@ -0,0 +1 @@
+#![doc = include_str!("../README.cargo.md")]