added page footer

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "wg-easy-ca-lose"]
+	path = wg-easy-ca-lose
+	url = https://git.the1s.de/theis.gaedigk/wg-easy-ca-lose.git

README.md

@@ -1,164 +1,89 @@
 # CA-Lose
 
-CA-Lose is a small full-stack app for collecting ticket-sale/order form entries.
+Ticket intake and validation app with a React frontend and an Express + MySQL backend.
 
-## Tech stack
+## Tech Stack
 
-![React](https://img.shields.io/badge/React-20232A?logo=react&logoColor=61DAFB)
+![React](https://img.shields.io/badge/React-61DAFB?logo=react&logoColor=000&style=flat)
-![TypeScript](https://img.shields.io/badge/TypeScript-3178C6?logo=typescript&logoColor=fff)
+![TypeScript](https://img.shields.io/badge/TypeScript-3178C6?logo=typescript&logoColor=fff&style=flat)
-![Vite](https://img.shields.io/badge/Vite-646CFF?logo=vite&logoColor=fff)
+![Vite](https://img.shields.io/badge/Vite-646CFF?logo=vite&logoColor=fff&style=flat)
-![Tailwind CSS](https://img.shields.io/badge/Tailwind%20CSS-06B6D4?logo=tailwindcss&logoColor=fff)
+![Tailwind%20CSS](https://img.shields.io/badge/Tailwind%20CSS-38B2AC?logo=tailwindcss&logoColor=fff&style=flat)
-![MUI](https://img.shields.io/badge/MUI-007FFF?logo=mui&logoColor=fff)
+![MUI](https://img.shields.io/badge/MUI-007FFF?logo=mui&logoColor=fff&style=flat)
-![i18next](https://img.shields.io/badge/i18next-26A69A?logo=i18next&logoColor=fff)
+![React%20Query](https://img.shields.io/badge/React%20Query-FF4154?logo=reactquery&logoColor=fff&style=flat)
+![React%20Router](https://img.shields.io/badge/React%20Router-CA4245?logo=reactrouter&logoColor=fff&style=flat)
+![Node.js](https://img.shields.io/badge/Node.js-339933?logo=nodedotjs&logoColor=fff&style=flat)
+![Express](https://img.shields.io/badge/Express-000000?logo=express&logoColor=fff&style=flat)
+![MySQL](https://img.shields.io/badge/MySQL-4479A1?logo=mysql&logoColor=fff&style=flat)
+![Docker](https://img.shields.io/badge/Docker-2496ED?logo=docker&logoColor=fff&style=flat)
+![Nginx](https://img.shields.io/badge/Nginx-009639?logo=nginx&logoColor=fff&style=flat)
 
-![Node.js](https://img.shields.io/badge/Node.js-339933?logo=node.js&logoColor=fff)
+## Project Structure
-![Express](https://img.shields.io/badge/Express-000000?logo=express&logoColor=fff)
-![MySQL](https://img.shields.io/badge/MySQL-4479A1?logo=mysql&logoColor=fff)
 
-![Docker](https://img.shields.io/badge/Docker-2496ED?logo=docker&logoColor=fff)
+- Frontend (Vite + React + Tailwind + MUI): [frontend](frontend)
-![Nginx](https://img.shields.io/badge/Nginx-009639?logo=nginx&logoColor=fff)
+- Backend (Express): [backend](backend)
+- Database schema: [backend/scheme.sql](backend/scheme.sql)
+- Docker compose stack: [docker-compose.yml](docker-compose.yml)
 
-## Architecture
+## Quick Start (Docker)
 
-- **Frontend**: React + TypeScript + Vite (UI uses MUI + Tailwind, i18n via i18next)
+1. Set the database password env var used by Docker Compose:
-- **Backend**: Node.js + Express (also renders a minimal EJS page at `/`)
-- **Database**: MySQL 8
-
-In production, the frontend is served by **Nginx** and proxies `/backend/*` to the backend container.
-
-## Repos & folders
-
-```
-backend/   # Express API + EJS views
-frontend/  # React app (Vite) + Nginx container
-docker-compose.yml
-docker-compose.prod.yml
-```
-
-## API overview
-
-The backend router is mounted at `/default`:
-
-- `GET /default/users` → returns `{ users: string[] }`
-- `GET /default/confirm-user?username=<name>` → validates user and returns metadata (e.g. next id)
-- `POST /default/new-entry?username=<name>` → stores a new entry in MySQL
-
-## Configuration
-
-### Backend environment variables
-
-The backend reads configuration from environment variables (and can also load a `backend/.env` file via `dotenv`).
-
-- `PORT` (e.g. `8004`)
-- `DB_HOST` (e.g. `ca-lose-mysql` when using Docker Compose)
-- `DB_USER` (e.g. `root`)
-- `DB_PASSWORD`
-- `DB_NAME` (e.g. `ca_lose`)
-
-### Docker Compose environment
-
-Both compose files expect `DB_PASSWORD` to be present in your shell environment or a root `.env` file.
-
-Create a root `.env` (not committed) like:
-
-```env
-DB_PASSWORD=change-me
-```
-
-## Local development
-
-### Option A: Docker Compose (backend + database)
-
-This is the quickest way to get the API + MySQL running.
 
 ```bash
-docker compose up --build
+export DB_PASSWORD=your_password
 ```
 
-What you get:
+2. Start MySQL and the backend:
-
-- Backend: http://localhost:8004
-- MySQL: localhost:3311 (container port 3306)
-
-Note: In `docker-compose.yml` the `frontend` service is currently commented out.
-
-### Option B: Run frontend locally (Vite) + run backend & DB
-
-1. Start DB + backend (Docker):
 
 ```bash
-docker compose up --build database backend
+docker compose up -d
-```
-
-2. Start frontend (local Node):
-
-```bash
-cd frontend
-npm ci
-npm run dev
-```
-
-Open the Vite dev server URL (usually http://localhost:5173).
-
-Important:
-
-- During local development (Vite), the frontend currently calls the backend via a hard-coded URL (`http://localhost:8004`).
-- When the frontend is served by the Nginx container, requests are expected to go through the Nginx proxy at `/backend/*` (see `frontend/nginx.conf`). In that setup the frontend should use `/backend/default/...` instead of `http://localhost:8004/...`.
-
-## Database setup
-
-The schema file is in `backend/scheme.sql`.
-
-- The `users` table is required for the user dropdown.
-- The backend creates an entry table dynamically per user and date when calling `GET /default/confirm-user`.
-
-Example (inside MySQL):
-
-```sql
-INSERT INTO users (username, first_name, last_name)
-VALUES ('demo', 'Demo', 'User');
-```
-
-## Production / Deployment
-
-The production compose file builds and runs:
-
-- `frontend` (Nginx)
-- `backend` (Express)
-- `database` (MySQL)
-- optional infrastructure: `dnsmasq` and `wireguard` (wg-easy)
-
-Start it:
-
-```bash
-docker compose -f docker-compose.prod.yml up -d --build
 ```
 
 Notes:
 
-- `docker-compose.prod.yml` uses an **external** network called `proxynet`. Create it if it does not exist:
+- The frontend service is commented out in [docker-compose.yml](docker-compose.yml). If you want the frontend container, uncomment that block and rebuild.
+- The frontend container uses Nginx and proxies /backend to the backend service (see [frontend/nginx.conf](frontend/nginx.conf)).
 
-  ```bash
+## Local Development
-  docker network create proxynet
-  ```
 
-- The production file assigns static IPs; adjust the subnets/IPs if they conflict with your environment.
+### Backend
 
-## Lint / build
+1. Create a .env file in the backend folder with:
 
-Frontend:
+```env
+PORT=8004
+DB_HOST=127.0.0.1
+DB_USER=root
+DB_PASSWORD=your_password
+DB_NAME=ca_lose
+```
+
+2. Install deps and run:
+
+```bash
+cd backend
+npm install
+node server.js
+```
+
+Backend listens on http://localhost:8004 and exposes routes under /default.
+
+### Frontend
 
 ```bash
 cd frontend
-npm run lint
+npm install
-npm run build
+npm run dev
 ```
 
-## Troubleshooting
+Vite runs the app on the default dev port and talks to the backend using the API helpers in [frontend/src/utils/api](frontend/src/utils/api).
 
-- **Backend does not start / ESM imports**: The backend code uses ESM `import` syntax. Node must treat the backend as an ESM project (commonly by adding `"type": "module"` to `backend/package.json`). Without that, the backend will fail to start (including in Docker).
+## API Endpoints
-- **MySQL timezone mount**: The compose files mount `./mysql-timezone.cnf` to `/etc/mysql/conf.d/timezone.cnf`. Ensure `mysql-timezone.cnf` is a file (not a directory) with valid MySQL config, or remove/adjust the mount.
 
-## License
+- GET /default/users
+- GET /default/confirm-user?username={name}
+- POST /default/new-entry?username={name}
 
-Licensed under the Apache License 2.0. See [LICENSE](LICENSE).
+## Database Notes
+
+- The base users table is defined in [backend/scheme.sql](backend/scheme.sql).
+- Per-user ticket tables are created on demand by the backend (see [backend/routes/default/frontend.data.js](backend/routes/default/frontend.data.js)).

backend/routes/default/frontend.data.js

@@ -28,6 +28,9 @@ export const confirmUser = async (username) => {
   ]);
 
   if (rows.length > 0) {
+    const { first_name, last_name } = rows[0];
+    const fullname = first_name + " " + last_name;
+
     // creating userTicketTable
     const d = new Date();
 
@@ -37,8 +40,6 @@ export const confirmUser = async (username) => {
     const date = `${day}_${month}_${year}`;
     const tableName = `${username}_${date}`;
 
-    console.log(tableName);
-
     const [createTable] = await pool.query(
       `CREATE TABLE IF NOT EXISTS ?? (
         id INT AUTO_INCREMENT PRIMARY KEY,
@@ -70,9 +71,9 @@ export const confirmUser = async (username) => {
         nextID = rows.length > 0 ? rows[0].id + 1 : 1;
       };
       await getNextID();
-      return { success: true, nextID, tableName };
+      return { success: true, nextID, tableName, fullname };
     } else {
-      return { success: false, message: "Table creation failed" };
+      return { success: false, message: "Table creation failed", fullname };
     }
   } else {
     return null;

backend/routes/default/frontend.route.js

@@ -11,8 +11,6 @@ router.post("/new-entry", async (req, res) => {
   if (!result.success) {
     return res.status(500).json({ message: "Form Data Invalid" });
   }
-  console.log(req.body);
-  console.log(username);
   res.sendStatus(204);
 });
 

frontend/package-lock.json

@@ -16,14 +16,19 @@
         "@mui/joy": "^5.0.0-beta.52",
         "@mui/material": "^9.0.1",
         "@tailwindcss/vite": "^4.3.0",
+        "@tanstack/react-form": "^1.32.0",
+        "@tanstack/react-query": "^5.100.10",
         "i18next": "^26.0.10",
         "js-cookie": "^3.0.5",
+        "k6": "^0.0.0",
         "lucide-react": "^1.14.0",
         "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
         "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0",
         "react-i18next": "^17.0.7",
         "react-router-dom": "^7.15.0",
-        "tailwindcss": "^4.3.0"
+        "tailwindcss": "^4.3.0",
+        "validator": "^13.15.35",
+        "zod": "^4.4.3"
       },
       "devDependencies": {
         "@eslint/js": "^10.0.1",
@@ -31,6 +36,7 @@
         "@types/node": "^24.12.2",
         "@types/react": "^19.2.14",
         "@types/react-dom": "^19.2.3",
+        "@types/validator": "^13.15.10",
         "@vitejs/plugin-react": "^6.0.1",
         "eslint": "^10.2.1",
         "eslint-plugin-react-hooks": "^7.1.1",
@@ -1766,6 +1772,126 @@
         "vite": "^5.2.0 || ^6 || ^7 || ^8"
       }
     },
+    "node_modules/@tanstack/devtools-event-client": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@tanstack/devtools-event-client/-/devtools-event-client-0.4.3.tgz",
+      "integrity": "sha512-OZI6QyULw0FI0wjgmeYzCIfbgPsOEzwJtCpa69XrfLMtNXLGnz3d/dIabk7frg0TmHo+Ah49w5I4KC7Tufwsvw==",
+      "license": "MIT",
+      "bin": {
+        "intent": "bin/intent.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/form-core": {
+      "version": "1.32.0",
+      "resolved": "https://registry.npmjs.org/@tanstack/form-core/-/form-core-1.32.0.tgz",
+      "integrity": "sha512-Tn5VRDSjyqjmaet2tJMuEWDRFyrCaon03vxXPlSSaiSs6C/N7lCIwGCXJbZXEUq1kTj8jYN9qyXHbsz4LQHcow==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/devtools-event-client": "^0.4.1",
+        "@tanstack/pacer-lite": "^0.1.1",
+        "@tanstack/store": "^0.9.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/pacer-lite": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/pacer-lite/-/pacer-lite-0.1.1.tgz",
+      "integrity": "sha512-y/xtNPNt/YeyoVxE/JCx+T7yjEzpezmbb+toK8DDD1P4m7Kzs5YR956+7OKexG3f8aXgC3rLZl7b1V+yNUSy5w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/query-core": {
+      "version": "5.100.10",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.100.10.tgz",
+      "integrity": "sha512-8UR0yJR+GiQ40m3lPhUr0xbfAupe6GSQiksSBSa9SM2NjezFyxXCIA69/lz8cSoNKZLrw1/PktIyQBJcVeMi3w==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/react-form": {
+      "version": "1.32.0",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-form/-/react-form-1.32.0.tgz",
+      "integrity": "sha512-6WP5SQTA6/H9crCpvpq3ZppYWqtrdE5NjOy6ebABi6uAQPqhfTzrdjS9t40mCZCFtGI5585OhJV6zBP/KN2zcw==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/form-core": "1.32.0",
+        "@tanstack/react-store": "^0.9.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^17.0.0 || ^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@tanstack/react-start": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@tanstack/react-query": {
+      "version": "5.100.10",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.100.10.tgz",
+      "integrity": "sha512-FLaZf2RCrA/Zgp4aiu5tG3TyasTRO7aZ99skxQpr3Hg/zXOhu6yq5FZCYQ/tRaJtM9ylnoK8tFK7PolXQadv6Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.100.10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^18 || ^19"
+      }
+    },
+    "node_modules/@tanstack/react-store": {
+      "version": "0.9.3",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-store/-/react-store-0.9.3.tgz",
+      "integrity": "sha512-y2iHd/N9OkoQbFJLUX1T9vbc2O9tjH0pQRgTcx1/Nz4IlwLvkgpuglXUx+mXt0g5ZDFrEeDnONPqkbfxXJKwRg==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/store": "0.9.3",
+        "use-sync-external-store": "^1.6.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
+        "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
+    "node_modules/@tanstack/store": {
+      "version": "0.9.3",
+      "resolved": "https://registry.npmjs.org/@tanstack/store/-/store-0.9.3.tgz",
+      "integrity": "sha512-8reSzl/qGWGGVKhBoxXPMWzATSbZLZFWhwBAFO9NAyp0TxzfBP0mIrGb8CP8KrQTmvzXlR/vFPPUrHTLBGyFyw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
     "node_modules/@tybys/wasm-util": {
       "version": "0.10.2",
       "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.2.tgz",
@@ -1854,6 +1980,13 @@
         "@types/react": "*"
       }
     },
+    "node_modules/@types/validator": {
+      "version": "13.15.10",
+      "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.15.10.tgz",
+      "integrity": "sha512-T8L6i7wCuyoK8A/ZeLYt1+q0ty3Zb9+qbSSvrIVitzT3YjZqkTZ40IbRsPanlB4h1QB3JVL1SYCdR6ngtFYcuA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@typescript-eslint/eslint-plugin": {
       "version": "8.59.2",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.59.2.tgz",
@@ -2976,12 +3109,12 @@
       }
     },
     "node_modules/js-cookie": {
-      "version": "3.0.5",
+      "version": "3.0.7",
-      "resolved": "https://registry.npmjs.org/js-cookie/-/js-cookie-3.0.5.tgz",
+      "resolved": "https://registry.npmjs.org/js-cookie/-/js-cookie-3.0.7.tgz",
-      "integrity": "sha512-cEiJEAEoIbWfCZYKWhVwFuvPX1gETRYPw6LlaTKoxD3s2AkXzkCjnp6h0V77ozyqj0jakteJ4YqDJT830+lVGw==",
+      "integrity": "sha512-z/wZZgDrkNV1eA0ULjM/F9/50Ya8fbzgKneSpoPsXSGd0KnpdtHfOZWK+GcwLk+EZbS4F9RBhU+K2RgzuDaItw==",
       "license": "MIT",
       "engines": {
-        "node": ">=14"
+        "node": ">=20"
       }
     },
     "node_modules/js-tokens": {
@@ -3042,6 +3175,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/k6": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/k6/-/k6-0.0.0.tgz",
+      "integrity": "sha512-GAQSWayS2+LjbH5bkRi+pMPYyP1JSp7o+4j58ANZ762N/RH/SdlAT3CHHztnn8s/xgg8kYNM24Gd2IPo9b5W+g==",
+      "license": "AGPL-3.0"
+    },
     "node_modules/keyv": {
       "version": "4.5.4",
       "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
@@ -4059,6 +4198,15 @@
         "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "node_modules/validator": {
+      "version": "13.15.35",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.15.35.tgz",
+      "integrity": "sha512-TQ5pAGhd5whStmqWvYF4OjQROlmv9SMFVt37qoCBdqRffuuklWYQlCNnEs2ZaIBD1kZRNnikiZOS1eqgkar0iw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/vite": {
       "version": "8.0.11",
       "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.11.tgz",
@@ -4178,23 +4326,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/yaml": {
-      "version": "2.8.4",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.4.tgz",
-      "integrity": "sha512-ml/JPOj9fOQK8RNnWojA67GbZ0ApXAUlN2UQclwv2eVgTgn7O9gg9o7paZWKMp4g0H3nTLtS9LVzhkpOFIKzog==",
-      "license": "ISC",
-      "optional": true,
-      "peer": true,
-      "bin": {
-        "yaml": "bin.mjs"
-      },
-      "engines": {
-        "node": ">= 14.6"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/eemeli"
-      }
-    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
@@ -4212,7 +4343,6 @@
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
       "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
-      "dev": true,
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"

frontend/package.json

@@ -18,14 +18,19 @@
     "@mui/joy": "^5.0.0-beta.52",
     "@mui/material": "^9.0.1",
     "@tailwindcss/vite": "^4.3.0",
+    "@tanstack/react-form": "^1.32.0",
+    "@tanstack/react-query": "^5.100.10",
     "i18next": "^26.0.10",
     "js-cookie": "^3.0.5",
+    "k6": "^0.0.0",
     "lucide-react": "^1.14.0",
     "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
     "react-dom": "^17.0.0 || ^18.0.0 || ^19.0.0",
     "react-i18next": "^17.0.7",
     "react-router-dom": "^7.15.0",
-    "tailwindcss": "^4.3.0"
+    "tailwindcss": "^4.3.0",
+    "validator": "^13.15.35",
+    "zod": "^4.4.3"
   },
   "peerDependencies": {
     "react": "^17.0.0 || ^18.0.0 || ^19.0.0",
@@ -37,6 +42,7 @@
     "@types/node": "^24.12.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
+    "@types/validator": "^13.15.10",
     "@vitejs/plugin-react": "^6.0.1",
     "eslint": "^10.2.1",
     "eslint-plugin-react-hooks": "^7.1.1",

frontend/src/App.css

@@ -6,3 +6,7 @@ body,
   height: 100%;
   margin: 0;
 }
+
+body.success-bg {
+  background: linear-gradient(135deg, #0f172a, #111827);
+}

frontend/src/App.tsx

@@ -2,15 +2,21 @@ import "./App.css";
 import { BrowserRouter, Route, Routes } from "react-router-dom";
 import { MainForm } from "./pages/MainForm";
 import { SuccessPage } from "./pages/SuccessPage";
+import { PageFooter } from "./components/PageFooter";
 
 function App() {
   return (
-    <BrowserRouter>
+    <div className="min-h-screen flex flex-col">
-      <Routes>
+      <BrowserRouter>
-        <Route path="/" element={<MainForm />} />
+        <main className="flex-1 flex">
-        <Route path="/success" element={<SuccessPage />} />
+          <Routes>
-      </Routes>
+            <Route path="/" element={<MainForm />} />
-    </BrowserRouter>
+            <Route path="/success" element={<SuccessPage />} />
+          </Routes>
+        </main>
+      </BrowserRouter>
+      <PageFooter />
+    </div>
   );
 }
 

frontend/src/components/PageFooter.tsx

@@ -0,0 +1,42 @@
+import { Link, Sheet, Typography } from "@mui/joy";
+import { useTranslation } from "react-i18next";
+import qrCode from "../assets/Portfolio-QR-Code.png";
+
+export const PageFooter = () => {
+  const { t } = useTranslation();
+
+  return (
+    <footer className="w-full mt-auto px-3 pb-3">
+      <Sheet
+        variant="soft"
+        className="mx-auto w-full max-w-3xl rounded-2xl border border-slate-200/70 bg-white/80 backdrop-blur"
+      >
+        <div className="flex flex-col gap-2 p-2.5 sm:p-3">
+          <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+            <Typography
+              level="title-sm"
+              className="text-slate-800 tracking-wide"
+            >
+              {t("footer-headline")}
+              <Link
+                href="https://portfolio-theis.de/"
+                target="_blank"
+                rel="noreferrer"
+                className="ml-2 inline-flex items-center text-slate-700 underline decoration-slate-300 underline-offset-4 hover:text-slate-900"
+              >
+                portfolio-theis.de
+              </Link>
+            </Typography>
+            <Typography level="body-sm" className="text-slate-500">
+              <img
+                src={qrCode}
+                alt="https://portfolio-theis.de/"
+                className="h-20 w-20 rounded-md border border-slate-200 object-contain"
+              />
+            </Typography>
+          </div>
+        </div>
+      </Sheet>
+    </footer>
+  );
+};

frontend/src/components/TextField.tsx

@@ -0,0 +1,31 @@
+import type { TextFieldProps } from "../config/interfaces.config";
+import { FormControl, FormLabel, Input } from "@mui/joy";
+
+export const TextField = ({
+  label,
+  type = "text",
+  required,
+  errors,
+  value,
+  onBlur,
+  onChange,
+  slotProps,
+  afterInput,
+}: TextFieldProps) => (
+  <FormControl required={required}>
+    <FormLabel>{label}</FormLabel>
+    <Input
+      value={value ?? ""}
+      onBlur={onBlur}
+      onChange={(e) => onChange(e.target.value)}
+      type={type}
+      variant="soft"
+      sx={{ borderRadius: "10px" }}
+      slotProps={slotProps}
+    />
+    {afterInput}
+    {errors[0] ? (
+      <span className="text-red-500 text-sm">{errors[0]}</span>
+    ) : null}
+  </FormControl>
+);

frontend/src/components/modals/QR-CodeModal.tsx

@@ -0,0 +1,31 @@
+import { Modal, ModalDialog, Typography, ModalClose } from "@mui/joy";
+import { useTranslation } from "react-i18next";
+import qrCode from "../../assets/PayPal-QR-Code.png";
+
+interface QRcodeModalProps {
+  QRmodal: boolean;
+  setQRmodal: (value: boolean) => void;
+}
+
+export const QRcodeModal = (props: QRcodeModalProps) => {
+  const { t } = useTranslation();
+
+  return (
+    <Modal open={props.QRmodal}>
+      <ModalDialog color="primary" layout="center" size="lg">
+        <ModalClose onClick={() => props.setQRmodal(false)} />
+        <Typography>{t("qr-text")}</Typography>
+        <img
+          src={qrCode}
+          alt="PayPal QR Code"
+          style={{
+            width: "100%",
+            height: "auto",
+            maxHeight: "70vh",
+            objectFit: "contain",
+          }}
+        />
+      </ModalDialog>
+    </Modal>
+  );
+};

frontend/src/components/modals/SelectUserModal.tsx

@@ -0,0 +1,40 @@
+import {
+  Modal,
+  ModalDialog,
+  Typography,
+  ModalClose,
+  Autocomplete,
+} from "@mui/joy";
+import { useTranslation } from "react-i18next";
+
+interface SelectUserModalProps {
+  showSelectUser: boolean;
+  setShowSelectUser: (value: boolean) => void;
+  usernameData: { users: string[] };
+  usernameDataIsLoading: boolean;
+  selectedUser: string | null;
+  handleUserSelection: (value: string | null) => void;
+}
+
+export const SelectUserModal = (props: SelectUserModalProps) => {
+  const { t } = useTranslation();
+  return (
+    <Modal open={props.showSelectUser}>
+      <ModalDialog color="primary" layout="center" size="lg">
+        <ModalClose onClick={() => props.setShowSelectUser(false)} />
+        <Typography>{t("user")}</Typography>
+        {/* User selection */}
+        <Autocomplete
+          options={props.usernameData?.users ?? []}
+          loading={props.usernameDataIsLoading}
+          loadingText={t("loading")}
+          value={props.selectedUser}
+          onChange={(_, value) => props.handleUserSelection(value)}
+          placeholder={t("user")}
+          variant="soft"
+          sx={{ borderRadius: "10px" }}
+        />
+      </ModalDialog>
+    </Modal>
+  );
+};

frontend/src/config/interfaces.config.ts

@@ -1,3 +1,7 @@
+import z from "zod";
+import validator from "validator";
+import type { ReactNode } from "react";
+
 export interface FormData {
   firstName: string;
   lastName: string;
@@ -19,3 +23,47 @@ export interface Message {
   headline: string;
   text: string;
 }
+
+export type TextFieldProps = {
+  label: string;
+  type?: "text" | "email" | "tel" | "number";
+  required?: boolean;
+  errors: string[];
+  onBlur: () => void;
+  onChange: (value: string) => void;
+  value: string | number | null | undefined;
+  slotProps?: { input?: Record<string, unknown> };
+  afterInput?: ReactNode;
+};
+
+export const createFormSchema = (
+  t: (key: string) => string,
+  invoice: boolean,
+) =>
+  z.object({
+    firstName: z.string().min(1, t("name-error")),
+    lastName: z.string().min(1, t("name-error")),
+    email: z.email(t("email-error")),
+    phoneNumber: z.string(t("phone-error")).refine(validator.isMobilePhone),
+    tickets: z.number(t("ticket-error")).min(1),
+    companyName: invoice
+      ? z.string().min(1, t("name-error"))
+      : z.string().optional(),
+    cmpFirstName: invoice
+      ? z.string().min(1, t("name-error"))
+      : z.string().optional(),
+    cpmLastName: invoice
+      ? z.string().min(1, t("name-error"))
+      : z.string().optional(),
+    cpmEmail: invoice ? z.email(t("email-error")) : z.string().optional(),
+    cpmPhoneNumber: invoice
+      ? z.string(t("phone-error")).refine(validator.isMobilePhone)
+      : z.string().optional(),
+    street: invoice
+      ? z.string().min(1, t("name-error"))
+      : z.string().optional(),
+    postalCode: invoice
+      ? z.string().min(1, t("name-error"))
+      : z.string().optional(),
+    paymentMethod: z.string().min(1, t("name-error")),
+  });

frontend/src/main.tsx

@@ -3,9 +3,14 @@ import { createRoot } from "react-dom/client";
 import "./utils/i18n/index.ts";
 import "./index.css";
 import App from "./App.tsx";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+
+const queryClient = new QueryClient();
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
-    <App />
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>
   </StrictMode>,
 );

frontend/src/pages/MainForm.tsx

@@ -1,6 +1,5 @@
 import { useTranslation } from "react-i18next";
 import { useState, useEffect } from "react";
-import * as React from "react";
 import Cookies from "js-cookie";
 import {
   Sheet,
@@ -13,19 +12,23 @@ import {
   Typography,
   FormControl,
   FormLabel,
-  Autocomplete,
   ButtonGroup,
-  Modal,
+  CircularProgress,
-  ModalDialog,
-  ModalClose,
 } from "@mui/joy";
-import { submitFormData } from "../utils/sender";
+import { submitFormData } from "../utils/api/form";
-import { API_BASE } from "../config/api.config";
 import type { FormData, Message } from "../config/interfaces.config";
 import PersonIcon from "@mui/icons-material/Person";
 import QrCodeIcon from "@mui/icons-material/QrCode";
 import TranslateIcon from "@mui/icons-material/Translate";
-import qrCode from "../assets/PayPal-QR-Code.png";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { confirmUser, fetchUsers } from "../utils/api/users";
+import { QRcodeModal } from "../components/modals/QR-CodeModal";
+import { SelectUserModal } from "../components/modals/SelectUserModal";
+import { useForm } from "@tanstack/react-form";
+import { changeTranslation } from "../utils/uxFncs";
+import { createFormSchema } from "../config/interfaces.config";
+import type { ZodObject, ZodRawShape } from "zod";
+import { TextField } from "../components/TextField";
 
 const PAYMENT_METHODS = ["bar", "paypal", "andere"] as const;
 const PAYMENT_LABELS: Record<string, string> = {
@@ -34,193 +37,154 @@ const PAYMENT_LABELS: Record<string, string> = {
   andere: "Transfer",
 };
 
-const DEFAULT_FORM: FormData = {
+/**
-  firstName: "",
+ * Validates a single field against the full Zod schema.
-  lastName: "",
+ * Returns the first error message for that field, or undefined if valid.
-  email: "",
+ */
-  phoneNumber: "",
+function validateFieldWithZod(
-  tickets: 1,
+  schema: ZodObject<ZodRawShape>,
-  companyName: "",
+  fieldName: string,
-  cmpFirstName: "",
+  allValues: Record<string, unknown>,
-  cpmLastName: "",
+): string | undefined {
-  cpmEmail: "",
+  const result = schema.safeParse(allValues);
-  cpmPhoneNumber: "",
+  if (result.success) return undefined;
-  street: "",
+  const issue = result.error.issues.find(
-  postalCode: "",
+    (i) => i.path.length === 1 && i.path[0] === fieldName,
-  paymentMethod: "",
+  );
-};
+  return issue?.message;
-
+}
-// ─── Field component lives OUTSIDE MainForm so React doesn't treat it as a
-// new component type on every render, which would cause inputs to lose focus.
-const Field = ({
-  label,
-  name,
-  type = "text",
-  required = true,
-  formData,
-  onChange,
-}: {
-  label: string;
-  name: keyof FormData;
-  type?: string;
-  required?: boolean;
-  formData: FormData;
-  onChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
-}) => (
-  <FormControl required={required}>
-    <FormLabel>{label}</FormLabel>
-    <Input
-      name={name}
-      type={type}
-      value={formData[name] as string}
-      onChange={onChange}
-      variant="soft"
-      sx={{ borderRadius: "10px" }}
-    />
-  </FormControl>
-);
 
 export const MainForm = () => {
-  const { t, i18n } = useTranslation();
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
 
   const [invoice, setInvoice] = useState(false);
   const [msg, setMsg] = useState<Message | null>(null);
-  const [isLoading, setIsLoading] = useState(false);
-  const [nextID, setNextID] = useState<number | null>(null);
-  const [users, setUsers] = useState<string[]>([]);
   const [selectedUser, setSelectedUser] = useState<string | null>(null);
-  const [formData, setFormData] = useState<FormData>(DEFAULT_FORM);
   const [showSelectUser, setShowSelectUser] = useState(false);
   const [QRmodal, setQRmodal] = useState(false);
 
-  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+  const formSchema = createFormSchema(t, invoice);
-    setFormData({ ...formData, [e.target.name]: e.target.value });
+
+  const makeFieldValidator = (fieldName: string) => ({
+    onSubmit: ({
+      fieldApi,
+    }: {
+      fieldApi: { form: { state: { values: Record<string, unknown> } } };
+    }) => {
+      const allValues = fieldApi.form.state.values;
+      return validateFieldWithZod(formSchema, fieldName, allValues);
+    },
+    onBlur: ({
+      fieldApi,
+    }: {
+      fieldApi: { form: { state: { values: Record<string, unknown> } } };
+    }) => {
+      const allValues = fieldApi.form.state.values;
+      return validateFieldWithZod(formSchema, fieldName, allValues);
+    },
+  });
+
+  const { Field, Subscribe, handleSubmit, setFieldValue } = useForm({
+    defaultValues: {
+      firstName: "",
+      lastName: "",
+      email: "",
+      phoneNumber: "",
+      tickets: 1,
+      companyName: "",
+      cmpFirstName: "",
+      cpmLastName: "",
+      cpmEmail: "",
+      cpmPhoneNumber: "",
+      street: "",
+      postalCode: "",
+      paymentMethod: "",
+    },
+    onSubmit: async ({ value }) => {
+      const result = formSchema.safeParse(value);
+      if (!result.success) return;
+      mutateForm(value as FormData);
+    },
+  });
+
+  const getErrors = (field: {
+    state: { meta: { errorMap: Record<string, unknown> } };
+  }) => {
+    const normalizeErrors = (value: unknown) => {
+      if (Array.isArray(value)) return value as string[];
+      if (typeof value === "string" && value.length > 0) return [value];
+      return [] as string[];
+    };
+
+    const blurErrors = normalizeErrors(field.state.meta.errorMap["onBlur"]);
+    const submitErrors = normalizeErrors(field.state.meta.errorMap["onSubmit"]);
+    return [...blurErrors, ...submitErrors].filter(Boolean);
   };
 
-  const confirmUser = async (username: string) => {
+  useEffect(() => {
-    try {
+    const savedUser = Cookies.get("selectedUser");
-      const res = await fetch(
+    if (savedUser) {
-        `${API_BASE}/default/confirm-user?username=${username}`,
+      setSelectedUser(savedUser);
-      );
-      const data = await res.json();
-      setNextID(data.nextID);
-    } catch (error) {
-      console.error("Error confirming user:", error);
-    }
-  };
-
-  const handleUserSelection = (username: string | null) => {
-    if (!username) return;
-    setSelectedUser(username);
-    confirmUser(username);
-    Cookies.set("selectedUser", username);
-  };
-
-  const changeTranslation = () => {
-    const clientLng = i18n.language;
-
-    if (clientLng === "en") {
-      i18n.changeLanguage("de");
-      Cookies.set("language", "de");
-    } else if (clientLng === "de") {
-      i18n.changeLanguage("en");
-      Cookies.set("language", "en");
     } else {
       setMsg({
-        type: "danger",
+        type: "warning",
-        headline: "Error",
+        headline: t("set-username-headline"),
-        text: "Cannot change langugage.",
+        text: t("set-username-text"),
       });
     }
-  };
-
-  useEffect(() => {
-    if (formData.paymentMethod === "paypal") {
-      setQRmodal(true);
-    }
-  }, [formData.paymentMethod]);
-
-  useEffect(() => {
-    (async () => {
-      try {
-        const res = await fetch(`${API_BASE}/default/users`);
-        const data = await res.json();
-        setUsers(data.users);
-      } catch {
-        setMsg({
-          type: "danger",
-          headline: t("error"),
-          text: t("failed-to-load-users"),
-        });
-      }
-    })();
-
-    const cookieUser = Cookies.get("selectedUser");
-    if (cookieUser) {
-      setSelectedUser(cookieUser);
-      confirmUser(cookieUser);
-    }
   }, []);
 
-  const handleSubmit = async () => {
+  const { data: usernameData, isLoading: usernameDataIsLoading } = useQuery({
-    setIsLoading(true);
+    queryKey: ["users"],
-    try {
+    queryFn: fetchUsers,
-      const result = await submitFormData(formData, selectedUser || "");
+  });
-      if (result.success) {
-        document.location.href = `/success?id=${nextID}&tickets=${formData.tickets}`;
-      } else {
-        setMsg({
-          type: "danger",
-          headline: t("error"),
-          text: result.error || t("form-submission-failed"),
-        });
-      }
-    } finally {
-      setIsLoading(false);
-    }
-  };
 
-  // Shorthand so we don't repeat formData + onChange on every Field usage
+  const { data: userData } = useQuery({
-  const fieldProps = { formData, onChange: handleChange };
+    queryKey: ["user", selectedUser],
+    enabled: !!selectedUser,
+    queryFn: () => confirmUser(selectedUser),
+  });
+
+  const { mutate: mutateForm, isPending: mutateFormIsPending } = useMutation({
+    mutationFn: (values: FormData) => submitFormData(values, selectedUser),
+    onSuccess: (_, values) => {
+      queryClient.invalidateQueries({ queryKey: ["user", selectedUser] });
+      document.location.href = `/success?id=${nextID}&tickets=${values.tickets}`;
+    },
+    onError: () => {
+      queryClient.invalidateQueries({ queryKey: ["user", selectedUser] });
+      setMsg({
+        type: "danger",
+        headline: t("error"),
+        text: t("form-submission-failed"),
+      });
+    },
+  });
+
+  const nextID = userData?.nextID ?? "N/A";
+
+  const handleUserSelection = (username: string | null) => {
+    if (username == null || username == "") {
+      return;
+    }
+    setSelectedUser(username);
+  };
 
   return (
     <>
-      <Modal open={showSelectUser}>
+      <SelectUserModal
-        <ModalDialog color="primary" layout="center" size="lg">
+        showSelectUser={showSelectUser}
-          <ModalClose onClick={() => setShowSelectUser(false)} />
+        setShowSelectUser={setShowSelectUser}
-          <Typography>{t("user")}</Typography>
+        usernameData={usernameData}
-          {/* User selection */}
+        usernameDataIsLoading={usernameDataIsLoading}
-          <Autocomplete
+        selectedUser={selectedUser}
-            options={users}
+        handleUserSelection={handleUserSelection}
-            value={selectedUser}
+      />
-            onChange={(_, value) => handleUserSelection(value)}
-            placeholder={t("user")}
-            variant="soft"
-            sx={{ borderRadius: "10px" }}
-            onKeyDown={(e) => {
-              if (e.key === "Enter") e.preventDefault();
-            }}
-          />
-        </ModalDialog>
-      </Modal>
-      <Modal open={QRmodal}>
-        <ModalDialog color="primary" layout="center" size="lg">
-          <ModalClose onClick={() => setQRmodal(false)} />
-          <Typography>{t("qr-text")}</Typography>
-          <img
-            src={qrCode}
-            alt="PayPal QR Code"
-            style={{
-              width: "100%",
-              height: "auto",
-              maxHeight: "70vh",
-              objectFit: "contain",
-            }}
-          />
-        </ModalDialog>
-      </Modal>
 
-      <div className="min-h-screen w-full flex items-center justify-center from-slate-100 to-blue-50 p-4">
+      <QRcodeModal setQRmodal={setQRmodal} QRmodal={QRmodal} />
+
+      <div className="flex-1 w-full flex items-center justify-center from-slate-100 to-blue-50 p-4">
         <Sheet
           variant="plain"
           className="w-full"
@@ -246,10 +210,20 @@ export const MainForm = () => {
             <IconButton onClick={() => setQRmodal(true)}>
               <QrCodeIcon />
             </IconButton>
-            {/* Language toggle */}
             <IconButton onClick={changeTranslation}>
               <TranslateIcon />
             </IconButton>
+            <Typography
+              level="title-sm"
+              textColor="var(--joy-palette-success-plainColor)"
+              sx={{
+                fontFamily: "monospace",
+                opacity: "100%",
+                alignSelf: "center",
+              }}
+            >
+              {`${t("greeting")} ${userData?.fullname ?? t("loading")}`}
+            </Typography>
           </ButtonGroup>
 
           <form
@@ -259,7 +233,6 @@ export const MainForm = () => {
             }}
             className="flex flex-col gap-4"
           >
-            {/* Next ID badge */}
             <Chip
               size="lg"
               variant="solid"
@@ -276,41 +249,119 @@ export const MainForm = () => {
 
             {/* Name row */}
             <div className="grid grid-cols-2 gap-3">
-              <Field label={t("first-name")} name="firstName" {...fieldProps} />
+              <Field
-              <Field label={t("last-name")} name="lastName" {...fieldProps} />
+                name="firstName"
+                validators={makeFieldValidator("firstName")}
+              >
+                {(field) => (
+                  <TextField
+                    label={t("first-name")}
+                    required
+                    value={field.state.value}
+                    onBlur={field.handleBlur}
+                    onChange={field.handleChange}
+                    errors={getErrors(field)}
+                  />
+                )}
+              </Field>
+
+              <Field
+                name="lastName"
+                validators={makeFieldValidator("lastName")}
+              >
+                {(field) => (
+                  <TextField
+                    label={t("last-name")}
+                    required
+                    value={field.state.value}
+                    onBlur={field.handleBlur}
+                    onChange={field.handleChange}
+                    errors={getErrors(field)}
+                  />
+                )}
+              </Field>
             </div>
 
+            <Field name="email" validators={makeFieldValidator("email")}>
+              {(field) => (
+                <TextField
+                  label={t("email")}
+                  type="email"
+                  required
+                  value={field.state.value}
+                  onBlur={field.handleBlur}
+                  onChange={field.handleChange}
+                  errors={getErrors(field)}
+                />
+              )}
+            </Field>
+
             <Field
-              label={t("email")}
-              name="email"
-              type="email"
-              {...fieldProps}
-            />
-            <Field
-              label={t("phone-number")}
               name="phoneNumber"
-              type="tel"
+              validators={makeFieldValidator("phoneNumber")}
-              {...fieldProps}
+            >
-            />
+              {(field) => (
+                <TextField
+                  label={t("phone-number")}
+                  type="tel"
+                  required
+                  value={field.state.value}
+                  onBlur={field.handleBlur}
+                  onChange={field.handleChange}
+                  errors={getErrors(field)}
+                />
+              )}
+            </Field>
 
             {/* Tickets + Invoice toggle */}
             <div className="grid grid-cols-2 gap-3 items-end">
               <FormControl required>
                 <FormLabel>{t("tickets")}</FormLabel>
-                <Input
+                <Field
                   name="tickets"
-                  type="number"
+                  validators={makeFieldValidator("tickets")}
-                  value={formData.tickets}
+                >
-                  onChange={handleChange}
+                  {(field) => {
-                  slotProps={{ input: { min: 1 } }}
+                    const errors = getErrors(field);
-                  variant="soft"
+                    return (
-                  sx={{ borderRadius: "10px" }}
+                      <>
-                />
+                        <Input
+                          type="number"
+                          value={field.state.value ?? ""}
+                          onBlur={field.handleBlur}
+                          onChange={(e) =>
+                            field.handleChange(Number(e.target.value))
+                          }
+                          slotProps={{ input: { min: 1 } }}
+                          variant="soft"
+                          sx={{ borderRadius: "10px" }}
+                        />
+                        {errors.length > 0 && (
+                          <span className="text-red-500 text-sm">
+                            {errors[0]}
+                          </span>
+                        )}
+                      </>
+                    );
+                  }}
+                </Field>
               </FormControl>
               <div className="flex items-center pb-2">
                 <Checkbox
                   checked={invoice}
-                  onChange={(e) => setInvoice(e.target.checked)}
+                  onChange={(e) => {
+                    const checked = e.target.checked;
+                    setInvoice(checked);
+                    if (!checked) {
+                      setFieldValue("companyName", "");
+                      setFieldValue("cmpFirstName", "");
+                      setFieldValue("cpmLastName", "");
+                      setFieldValue("cpmEmail", "");
+                      setFieldValue("cpmPhoneNumber", "");
+                      setFieldValue("street", "");
+                      setFieldValue("postalCode", "");
+                    }
+                  }}
                   label={t("invoice")}
                   variant="outlined"
                 />
@@ -323,115 +374,193 @@ export const MainForm = () => {
                 <Typography level="title-sm" color="primary">
                   {t("invoice-details")}
                 </Typography>
+
                 <Field
-                  label={t("company-name")}
                   name="companyName"
-                  {...fieldProps}
+                  validators={makeFieldValidator("companyName")}
-                />
+                >
+                  {(field) => (
+                    <TextField
+                      label={t("company-name")}
+                      required
+                      value={field.state.value}
+                      onBlur={field.handleBlur}
+                      onChange={field.handleChange}
+                      errors={getErrors(field)}
+                    />
+                  )}
+                </Field>
+
                 <div className="grid grid-cols-2 gap-3">
                   <Field
-                    label={t("first-name")}
                     name="cmpFirstName"
-                    {...fieldProps}
+                    validators={makeFieldValidator("cmpFirstName")}
-                  />
+                  >
+                    {(field) => (
+                      <TextField
+                        label={t("first-name")}
+                        required
+                        value={field.state.value}
+                        onBlur={field.handleBlur}
+                        onChange={field.handleChange}
+                        errors={getErrors(field)}
+                      />
+                    )}
+                  </Field>
+
                   <Field
-                    label={t("last-name")}
                     name="cpmLastName"
-                    {...fieldProps}
+                    validators={makeFieldValidator("cpmLastName")}
-                  />
+                  >
+                    {(field) => (
+                      <TextField
+                        label={t("last-name")}
+                        required
+                        value={field.state.value}
+                        onBlur={field.handleBlur}
+                        onChange={field.handleChange}
+                        errors={getErrors(field)}
+                      />
+                    )}
+                  </Field>
                 </div>
-                <Field label={t("street")} name="street" {...fieldProps} />
+
+                <Field name="street" validators={makeFieldValidator("street")}>
+                  {(field) => (
+                    <TextField
+                      label={t("street")}
+                      required
+                      value={field.state.value}
+                      onBlur={field.handleBlur}
+                      onChange={field.handleChange}
+                      errors={getErrors(field)}
+                    />
+                  )}
+                </Field>
+
                 <Field
-                  label={t("postal-code")}
                   name="postalCode"
-                  {...fieldProps}
+                  validators={makeFieldValidator("postalCode")}
-                />
+                >
+                  {(field) => (
+                    <TextField
+                      label={t("postal-code")}
+                      required
+                      value={field.state.value}
+                      onBlur={field.handleBlur}
+                      onChange={field.handleChange}
+                      errors={getErrors(field)}
+                    />
+                  )}
+                </Field>
+
                 <Field
-                  label={t("phone-number")}
                   name="cpmPhoneNumber"
-                  type="tel"
+                  validators={makeFieldValidator("cpmPhoneNumber")}
-                  {...fieldProps}
+                >
-                />
+                  {(field) => (
+                    <TextField
+                      label={t("phone-number")}
+                      type="tel"
+                      required
+                      value={field.state.value}
+                      onBlur={field.handleBlur}
+                      onChange={field.handleChange}
+                      errors={getErrors(field)}
+                    />
+                  )}
+                </Field>
+
                 <Field
-                  label={t("email")}
                   name="cpmEmail"
-                  type="email"
+                  validators={makeFieldValidator("cpmEmail")}
-                  {...fieldProps}
+                >
-                />
+                  {(field) => (
+                    <TextField
+                      label={t("email")}
+                      type="email"
+                      required
+                      value={field.state.value}
+                      onBlur={field.handleBlur}
+                      onChange={field.handleChange}
+                      errors={getErrors(field)}
+                    />
+                  )}
+                </Field>
               </div>
             )}
 
             {/* Payment method selection */}
             <FormControl required>
               <FormLabel>{t("select-payment-method")}</FormLabel>
-              <div className="flex gap-2 flex-wrap mt-1">
+              <Subscribe selector={(state) => state.values.paymentMethod}>
-                {PAYMENT_METHODS.map((method) => (
+                {(paymentMethod) => (
-                  <Button
+                  <div className="flex gap-2 flex-wrap mt-1">
-                    key={method}
+                    {PAYMENT_METHODS.map((method) => (
-                    variant={
+                      <Button
-                      formData.paymentMethod === method ? "solid" : "soft"
+                        key={method}
-                    }
+                        variant={paymentMethod === method ? "solid" : "soft"}
-                    color="primary"
+                        color="primary"
-                    onClick={() =>
+                        onClick={() => {
-                      setFormData((prev) => ({
+                          setFieldValue("paymentMethod", method);
-                        ...prev,
+                          if (method === "paypal") {
-                        paymentMethod: method,
+                            setQRmodal(true);
-                      }))
+                          }
-                    }
+                        }}
-                    sx={{
+                        sx={{
-                      flex: 1,
+                          flex: 1,
-                      minWidth: "90px",
+                          minWidth: "90px",
-                      borderRadius: "12px",
+                          borderRadius: "12px",
-                      py: 1.5,
+                          py: 1.5,
-                      textTransform: "none",
+                          textTransform: "none",
-                      fontWeight: formData.paymentMethod === method ? 700 : 400,
+                          fontWeight: paymentMethod === method ? 700 : 400,
-                    }}
+                        }}
-                  >
+                      >
-                    {PAYMENT_LABELS[method]}
+                        {PAYMENT_LABELS[method]}
-                  </Button>
+                      </Button>
-                ))}
+                    ))}
-              </div>
+                  </div>
-              {/* Hidden required input to enforce payment selection on submit */}
+                )}
-              {!formData.paymentMethod && (
+              </Subscribe>
-                <input
-                  tabIndex={-1}
-                  required
-                  value=""
-                  onChange={() => {}}
-                  style={{
-                    opacity: 0,
-                    width: 0,
-                    height: 0,
-                    position: "absolute",
-                  }}
-                />
-              )}
             </FormControl>
 
-            {/* Submit button */}
+            {mutateFormIsPending ? (
-            <Button
+              <div className="flex items-center justify-center">
-              type="submit"
+                <CircularProgress />
-              loading={isLoading}
+              </div>
-              disabled={!formData.paymentMethod}
+            ) : (
-              size="lg"
+              <Subscribe selector={(state) => state.values.paymentMethod}>
-              sx={{
+                {(paymentMethod) => (
-                mt: 2,
+                  <Button
-                borderRadius: "14px",
+                    type="submit"
-                fontWeight: 700,
+                    disabled={!paymentMethod}
-                letterSpacing: "0.05em",
+                    size="lg"
-                background: "linear-gradient(135deg, #2563eb, #1d4ed8)",
+                    sx={{
-                "&:hover": {
+                      mt: 2,
-                  background: "linear-gradient(135deg, #1d4ed8, #1e40af)",
+                      borderRadius: "14px",
-                },
+                      fontWeight: 700,
-              }}
+                      letterSpacing: "0.05em",
-            >
+                      background: "linear-gradient(135deg, #2563eb, #1d4ed8)",
-              {t("submit")}
+                      "&:hover": {
-            </Button>
+                        background: "linear-gradient(135deg, #1d4ed8, #1e40af)",
+                      },
+                    }}
+                  >
+                    {t("submit")}
+                  </Button>
+                )}
+              </Subscribe>
+            )}
 
-            {/* Alert message */}
             {msg && (
-              <Alert color={msg.type} sx={{ borderRadius: "12px" }}>
+              <Alert
-                <strong>{msg.headline}:</strong> {msg.text}
+                color={msg.type}
+                sx={{ flexDirection: "column", alignItems: "flex-start" }}
+              >
+                <Typography level="title-lg" sx={{ mb: 0.5 }}>
+                  {msg.headline}
+                </Typography>
+                <Typography level="body-sm">{msg.text}</Typography>
               </Alert>
             )}
           </form>

frontend/src/pages/SuccessPage.tsx

@@ -16,6 +16,11 @@ export const SuccessPage = () => {
     setTickets(parseInt(params.get("tickets") ?? "0", 10));
     // Small delay so the CSS transition actually plays
     setTimeout(() => setAnimate(true), 100);
+
+    document.body.classList.add("success-bg");
+    return () => {
+      document.body.classList.remove("success-bg");
+    };
   }, []);
 
   useEffect(() => {
@@ -36,7 +41,7 @@ export const SuccessPage = () => {
   });
 
   return (
-    <div className="min-h-screen w-full flex items-center justify-center bg-linear-to-br from-slate-800 to-slate-900 p-4">
+    <div className="flex-1 w-full flex items-center justify-center p-4">
       <Sheet
         variant="plain"
         sx={{

frontend/src/utils/api/form.ts

@@ -0,0 +1,29 @@
+import { API_BASE } from "../../config/api.config";
+import type { FormData } from "../../config/interfaces.config";
+
+export const submitFormData = async (
+  data: FormData,
+  username: string | null,
+) => {
+  console.warn("submitFormData is fetching!");
+
+  // await new Promise((resolve) => setTimeout(resolve, 3000)); // Wait 3 seconds
+
+  const response = await fetch(
+    `${API_BASE}/default/new-entry?username=${username}`,
+    {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(data),
+    },
+  );
+
+  if (!response.ok) {
+    const error = await response.text();
+    throw new Error(error || "Form submission failed");
+  }
+
+  return;
+};

frontend/src/utils/api/users.ts

@@ -0,0 +1,25 @@
+import { API_BASE } from "../../config/api.config";
+import Cookies from "js-cookie";
+
+export const fetchUsers = async () => {
+  console.warn("fetchUsers is fetching!");
+
+  const response = await fetch(`${API_BASE}/default/users`);
+  const data = await response.json();
+
+  return data;
+};
+
+export const confirmUser = async (username: string | null) => {
+  if (!username) {
+    return;
+  }
+
+  console.warn("confirmUser is fetching!");
+  const response = await fetch(
+    `${API_BASE}/default/confirm-user?username=${username}`,
+  );
+  const data = await response.json();
+  Cookies.set("selectedUser", username);
+  return data;
+};

frontend/src/utils/i18n/locales/de/de.json

@@ -14,7 +14,7 @@
     "user": "Benutzer",
     "next-id": "Nächste Eintragsnummer: ",
     "form-submitted-successfully": "Formular erfolgreich übermittelt!",
-    "orm-submission-failed": "Formularübermittlung fehlgeschlagen.",
+    "form-submission-failed": "Formularübermittlung fehlgeschlagen.",
     "success": "Erfolg",
     "error": "Fehler",
     "cash": "Bar",
@@ -26,5 +26,13 @@
     "thank-you": "Vielen Dank für Ihre Unterstützung der Claudius Akademie! Wir wünschen Ihnen viel Glück mit dem Los.",
     "select-payment-method": "Zahlungsmethode auswählen",
     "return-to-homepage": "Zurück",
-    "qr-text": "PayPal QR-Code der Claudius Akademie"
+    "qr-text": "PayPal QR-Code der Claudius Akademie",
+    "loading": "Lädt...",
+    "greeting": "Hallo,",
+    "set-username-headline": "Keinen Benutzer ausgewählt",
+    "set-username-text": "Um mit dem Losverkauf zu beginnen, musst du einen Benutzer oben links auswählen.",
+    "name-error": "Sie müssen einen Namen eingeben!",
+    "email-error": "Sie müssen eine gültige E-Mail Adresse eingeben!",
+    "phone-error": "Sie müssen eine gültige Telefonnummer eingeben!",
+    "footer-headline": "Dieses System wurde vollständig konzipiert und entwickelt von Theis Gaedigk. - Portfolio: "
 }

frontend/src/utils/i18n/locales/en/en.json

@@ -27,5 +27,13 @@
     "thank-you": "Thank you for supporting the Claudius Akademie! We wish you the best of luck with your ticket.",
     "select-payment-method": "Select Payment Method",
     "return-to-homepage": "Return",
-    "qr-text": "PayPal QR-Code from the Claudius Akademie"
+    "qr-text": "PayPal QR-Code from the Claudius Akademie",
+    "loading": "Loading...",
+    "greeting": "Hello,",
+    "set-username-headline": "No user selected",
+    "set-username-text": "To start the ticket sale, you must select a user first from the top left.",
+    "name-error": "You have to enter a name!",
+    "email-error": "You have to enter a valid E-Mail adress!",
+    "phone-error": "You have to enter a vaild phone number!",
+    "footer-headline": "This system was fully designed and developed by Theis Gaedigk. - Portfolio: "
 }

frontend/src/utils/sender.ts

@@ -1,33 +0,0 @@
-import { API_BASE } from "../config/api.config";
-import type { FormData } from "../config/interfaces.config";
-
-export const submitFormData = async (
-  data: FormData,
-  username: string | null,
-) => {
-  if (username == null) {
-    return { success: false, errorCode: "x001" };
-  }
-
-  try {
-    const response = await fetch(
-      `${API_BASE}/default/new-entry?username=${username}`,
-      {
-        method: "POST",
-        headers: {
-          "Content-Type": "application/json",
-        },
-        body: JSON.stringify(data),
-      },
-    );
-
-    if (!response.ok) {
-      const errorText = await response.text();
-      return { success: false, error: `Server error: ${errorText}` };
-    }
-
-    return { success: true };
-  } catch (error) {
-    return { success: false, error: (error as Error).message };
-  }
-};

frontend/src/utils/uxFncs.ts

@@ -0,0 +1,16 @@
+import i18n from "./i18n";
+import Cookies from "js-cookie";
+
+export const changeTranslation = () => {
+  const clientLng = i18n.language;
+
+  if (clientLng === "en") {
+    i18n.changeLanguage("de");
+    Cookies.set("language", "de");
+  } else if (clientLng === "de") {
+    i18n.changeLanguage("en");
+    Cookies.set("language", "en");
+  } else {
+    alert("Cannot change language.");
+  }
+};

frontend/tests/test.local.js

@@ -0,0 +1,13 @@
+import http from "k6/http";
+import { sleep } from "k6";
+
+export const options = {
+  vus: 100, // amount of users
+  duration: "60s", // duration of the test
+};
+
+export default function () {
+  http.get("http://localhost:8004/default/confirm-user?username=TheisGaedigk");
+  http.get("http://localhost:8004/default/users");
+  sleep(1);
+}

frontend/tests/test.server.js

@@ -0,0 +1,15 @@
+// Before running: Establish VPN connection first
+
+import http from "k6/http";
+import { sleep } from "k6";
+
+export const options = {
+  vus: 100, // amount of users
+  duration: "60s", // duration of the test
+};
+
+export default function () {
+  http.get("http://backend:8004/default/confirm-user?username=TheisGaedigk");
+  http.get("http://backend:8004/default/users");
+  sleep(0.5);
+}