first commit

.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+*/node_modules/
+*/.pnp
+*.pnp.js
+
+# testing
+*/coverage
+
+# production
+*/build
+
+# misc
+*/.DS_Store
+*/.env.local
+*/.env.development.local
+*/.env.test.local
+*/.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

backend/init-db.js

@@ -0,0 +1,34 @@
+const Database = require('better-sqlite3');
+const db = new Database('db.sqlite3');
+
+// Tabellen erstellen
+db.exec(`
+CREATE TABLE IF NOT EXISTS abwesenheiten (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  datum TEXT NOT NULL,
+  start TEXT NOT NULL,
+  ende TEXT NOT NULL,
+  titel TEXT
+);
+
+CREATE TABLE IF NOT EXISTS zeitslots (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  datum TEXT NOT NULL,
+  start TEXT NOT NULL,
+  ende TEXT NOT NULL,
+  titel TEXT,
+  farbe TEXT
+);
+
+CREATE TABLE IF NOT EXISTS startzeiten (
+  datum TEXT PRIMARY KEY,
+  zeit TEXT
+);
+
+CREATE TABLE IF NOT EXISTS endzeiten (
+  datum TEXT PRIMARY KEY,
+  zeit TEXT
+);
+`);
+
+console.log("Datenbank initialisiert.");

backend/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "better-sqlite3": "^11.10.0",
+    "cors": "^2.8.5",
+    "express": "^5.1.0"
+  }
+}

backend/server.js

@@ -0,0 +1,144 @@
+const express = require("express");
+const cors = require("cors");
+const Database = require("better-sqlite3");
+const db = new Database("db.sqlite3");
+
+db.exec(`
+  CREATE TABLE IF NOT EXISTS startzeiten (
+    datum TEXT PRIMARY KEY,
+    zeit TEXT
+  );
+
+  CREATE TABLE IF NOT EXISTS endzeiten (
+    datum TEXT PRIMARY KEY,
+    zeit TEXT
+  );
+`);
+
+const app = express();
+
+app.use(cors());
+app.use(express.json());
+
+app.get("/api/data/:datum", (req, res) => {
+  const datum = req.params.datum;
+
+  const startzeitRow = db.prepare("SELECT zeit FROM startzeiten WHERE datum = ?").get(datum);
+  const startzeit = startzeitRow ? startzeitRow.zeit : "05:00";
+
+  const endzeitRow = db.prepare("SELECT zeit FROM endzeiten WHERE datum = ?").get(datum);
+  const endzeit = endzeitRow ? endzeitRow.zeit : "21:00";
+
+  const abwesenheiten = db.prepare("SELECT * FROM abwesenheiten WHERE datum = ?").all(datum);
+  const zeitslots = db.prepare("SELECT * FROM zeitslots WHERE datum = ?").all(datum);
+
+  const startTotalMin = parseInt(startzeit.split(":")[0]) * 60 + parseInt(startzeit.split(":")[1]);
+  const endTotalMin = parseInt(endzeit.split(":")[0]) * 60 + parseInt(endzeit.split(":")[1]);
+
+  const gefilterteSlots = zeitslots.filter(z => {
+    const startMin = parseInt(z.start.split(":")[0]) * 60 + parseInt(z.start.split(":")[1]);
+    const endMin = parseInt(z.ende.split(":")[0]) * 60 + parseInt(z.ende.split(":")[1]);
+    return startMin >= startTotalMin && endMin <= endTotalMin;
+  });
+
+  res.json({ abwesenheiten, zeitslots: gefilterteSlots, startzeit, endzeit });
+});
+
+app.post("/api/abwesenheit", (req, res) => {
+  const { datum, titel, start, ende } = req.body;
+  if (!datum || !titel || !start || !ende) {
+    return res.status(400).json({ error: "Fehlende Angaben" });
+  }
+  const id = Date.now().toString();
+  const stmt = db.prepare("INSERT INTO abwesenheiten (id, datum, titel, start, ende) VALUES (?, ?, ?, ?, ?)");
+  stmt.run(id, datum, titel, start, ende);
+  const abwesenheit = { id, datum, titel, start, ende };
+  res.status(201).json(abwesenheit);
+});
+
+app.put("/api/abwesenheit/:id", (req, res) => {
+  const id = req.params.id;
+  const existing = db.prepare("SELECT * FROM abwesenheiten WHERE id = ?").get(id);
+  if (!existing) {
+    return res.status(404).json({ error: "Abwesenheit nicht gefunden" });
+  }
+  const { datum = existing.datum, grund = existing.grund, von = existing.von, bis = existing.bis } = req.body;
+  const stmt = db.prepare("UPDATE abwesenheiten SET datum = ?, grund = ?, von = ?, bis = ? WHERE id = ?");
+  stmt.run(datum, grund, von, bis, id);
+  const updated = db.prepare("SELECT * FROM abwesenheiten WHERE id = ?").get(id);
+  res.json(updated);
+});
+
+app.delete("/api/abwesenheit/:id", (req, res) => {
+  const id = req.params.id;
+  const stmt = db.prepare("DELETE FROM abwesenheiten WHERE id = ?");
+  const info = stmt.run(id);
+  if (info.changes === 0) {
+    res.status(404).json({ error: "Abwesenheit nicht gefunden" });
+  } else {
+    res.status(204).end();
+  }
+});
+
+app.post("/api/zeitslot", (req, res) => {
+  const { datum, start, ende, titel, farbe } = req.body;
+  if (!datum || !start || !ende || !titel) {
+    return res.status(400).json({ error: "Fehlende Angaben" });
+  }
+  const id = Date.now().toString();
+  const stmt = db.prepare("INSERT INTO zeitslots (id, datum, start, ende, titel, farbe) VALUES (?, ?, ?, ?, ?, ?)");
+  stmt.run(id, datum, start, ende, titel, farbe);
+  const zeitslot = { id, datum, start, ende, titel, farbe };
+  res.status(201).json(zeitslot);
+});
+
+app.put("/api/zeitslot/:id", (req, res) => {
+  const id = req.params.id;
+  const existing = db.prepare("SELECT * FROM zeitslots WHERE id = ?").get(id);
+  if (!existing) {
+    return res.status(404).json({ error: "Zeitslot nicht gefunden" });
+  }
+  const { datum = existing.datum, start = existing.start, ende = existing.ende, titel = existing.titel, farbe = existing.farbe } = req.body;
+  const stmt = db.prepare("UPDATE zeitslots SET datum = ?, start = ?, ende = ?, titel = ?, farbe = ? WHERE id = ?");
+  stmt.run(datum, start, ende, titel, farbe, id);
+  const updated = db.prepare("SELECT * FROM zeitslots WHERE id = ?").get(id);
+  res.json(updated);
+});
+
+app.delete("/api/zeitslot/:id", (req, res) => {
+  const id = req.params.id;
+  const stmt = db.prepare("DELETE FROM zeitslots WHERE id = ?");
+  const info = stmt.run(id);
+  if (info.changes === 0) {
+    res.status(404).json({ error: "Zeitslot nicht gefunden" });
+  } else {
+    res.status(204).end();
+  }
+});
+
+app.post("/api/startzeit", (req, res) => {
+  const { datum, zeit } = req.body;
+  if (datum && zeit) {
+    const stmt = db.prepare("INSERT INTO startzeiten (datum, zeit) VALUES (?, ?) ON CONFLICT(datum) DO UPDATE SET zeit=excluded.zeit");
+    stmt.run(datum, zeit);
+    res.json({ datum, zeit });
+  } else {
+    res.status(400).json({ error: "Fehlende Angaben" });
+  }
+});
+
+app.post("/api/endzeit", (req, res) => {
+  const { datum, zeit } = req.body;
+  if (datum && zeit) {
+    const stmt = db.prepare("INSERT INTO endzeiten (datum, zeit) VALUES (?, ?) ON CONFLICT(datum) DO UPDATE SET zeit=excluded.zeit");
+    stmt.run(datum, zeit);
+    res.json({ datum, zeit });
+  } else {
+    res.status(400).json({ error: "Fehlende Angaben" });
+  }
+});
+
+const PORT = process.env.PORT || 3001;
+app.listen(PORT, () => {
+  console.log(`Server läuft auf Port ${PORT}`);
+});

frontend/README.md

@@ -0,0 +1,70 @@
+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
+
+You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

frontend/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "frontend",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.3.0",
+    "@testing-library/user-event": "^13.5.0",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "react-scripts": "5.0.1",
+    "web-vitals": "^2.1.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

frontend/public/index.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

frontend/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

frontend/src/App.css

@@ -0,0 +1,38 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

frontend/src/App.js

@@ -0,0 +1,902 @@
+import React, { useEffect, useState, useRef } from "react";
+
+function App() {
+  const [datum, setDatum] = useState("2025-05-14");
+  const [data, setData] = useState({ abwesenheiten: [], zeitslots: [] });
+  const [startzeit, setStartzeit] = useState(null);
+  const [endzeit, setEndzeit] = useState(null);
+  const [manualEndzeit, setManualEndzeit] = useState("");
+  const [showEndzeitInput, setShowEndzeitInput] = useState(false);
+
+  // Gemeinsames Formular für neue Einträge
+  const [showForm, setShowForm] = useState(false);
+  const [isAbwesenheit, setIsAbwesenheit] = useState(true);
+  const [newEntry, setNewEntry] = useState({ titel: "", start: "", ende: "", farbe: "#ccffcc" });
+  // Ref für das neue Eintragsformular (Hülle)
+  const newEntryRef = useRef(null);
+  // Ref für das Texteingabefeld im neuen Eintrag
+  const newEntryInputRef = useRef(null);
+  // Fokussieren des neuen Eintragsformulars und Scrollen bei Anzeige
+  useEffect(() => {
+    if (showForm && newEntryInputRef.current) {
+      newEntryInputRef.current.focus();
+      newEntryInputRef.current.scrollIntoView({ behavior: "smooth", block: "center" });
+    }
+  }, [showForm]);
+
+  const [editAbwesenheitId, setEditAbwesenheitId] = useState(null);
+  const [editZeitslotId, setEditZeitslotId] = useState(null);
+  const [editForm, setEditForm] = useState({ titel: "", start: "", ende: "" });
+
+  const zeitachseRef = useRef(null);
+  const [pixelsPerMinute, setPixelsPerMinute] = useState(1);
+
+  const [manualStartzeit, setManualStartzeit] = useState("");
+  const [showStartzeitInput, setShowStartzeitInput] = useState(false);
+
+  useEffect(() => {
+    setPixelsPerMinute(1);
+  }, []);
+
+  const startEdit = (eintrag, typ) => {
+    setEditForm({ titel: eintrag.titel, start: eintrag.start, ende: eintrag.ende });
+    if (typ === "abwesenheit") setEditAbwesenheitId(eintrag.id);
+    if (typ === "zeitslot") setEditZeitslotId(eintrag.id);
+  };
+
+  // Speichern-Funktionen für Edit und Neu
+  const handleSaveEdit = async (typ) => {
+    const url =
+      typ === "abwesenheit"
+        ? `http://localhost:3001/api/abwesenheit/${editAbwesenheitId}`
+        : `http://localhost:3001/api/zeitslot/${editZeitslotId}`;
+    await fetch(url, {
+      method: "PUT",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(editForm),
+    });
+    setEditAbwesenheitId(null);
+    setEditZeitslotId(null);
+    setEditForm({ titel: "", start: "", ende: "" });
+    reloadData();
+  };
+
+  const handleSaveNew = async () => {
+    const endpoint = isAbwesenheit ? "abwesenheit" : "zeitslot";
+    await fetch(`http://localhost:3001/api/${endpoint}`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ datum, ...newEntry }),
+    });
+    setNewEntry({ titel: "", start: "", ende: "", farbe: "#ccffcc" });
+    setShowForm(false);
+    reloadData();
+  };
+
+  const deleteEntry = async (id, typ) => {
+    const url = `http://localhost:3001/api/${typ}/${id}`;
+    await fetch(url, { method: "DELETE" });
+    reloadData();
+    if (typ === "abwesenheit") setEditAbwesenheitId(null);
+    else setEditZeitslotId(null);
+  };
+
+  // Daten laden
+  useEffect(() => {
+    fetch(`http://localhost:3001/api/data/${datum}`)
+      .then((res) => res.json())
+      .then((data) => {
+        setData(data);
+        setStartzeit(data.startzeit);
+        setEndzeit(data.endzeit);
+      });
+  }, [datum]);
+
+
+  const reloadData = () => {
+    fetch(`http://localhost:3001/api/data/${datum}`)
+      .then((res) => res.json())
+      .then((data) => {
+        setData(data);
+        setStartzeit(data.startzeit);
+        setEndzeit(data.endzeit);
+      });
+  };
+  const beginSetEndzeit = () => {
+    const now = new Date();
+    const h = String(now.getHours()).padStart(2, "0");
+    const m = String(Math.floor(now.getMinutes() / 15) * 15).padStart(2, "0");
+    setManualEndzeit(`${h}:${m}`);
+    setShowEndzeitInput(true);
+  };
+
+  const saveManualEndzeit = async () => {
+    await fetch("http://localhost:3001/api/endzeit", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ datum, zeit: manualEndzeit }),
+    });
+    setShowEndzeitInput(false);
+    reloadData();
+  };
+
+  const beginSetStartzeit = () => {
+    const now = new Date();
+    const h = String(now.getHours()).padStart(2, "0");
+    const m = String(Math.floor(now.getMinutes() / 15) * 15).padStart(2, "0");
+    setManualStartzeit(`${h}:${m}`);
+    setShowStartzeitInput(true);
+  };
+
+  const saveManualStartzeit = async () => {
+    await fetch("http://localhost:3001/api/startzeit", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ datum, zeit: manualStartzeit }),
+    });
+    setShowStartzeitInput(false);
+    reloadData();
+  };
+
+  return (
+    <div style={{ padding: "2rem", fontFamily: "sans-serif" }}>
+      <div style={{ marginBottom: "1rem" }}>
+        <h1 style={{ fontSize: "2.5rem", fontWeight: "lighter", margin: 0 }}>
+          <span style={{ color: "#333" }}>My</span>
+          <span style={{ color: "#007acc" }}>Day</span>
+        </h1>
+        <div style={{ fontSize: "1.3rem", color: "#666" }}>
+          {new Date(datum).toLocaleDateString("de-DE", {
+            day: "2-digit",
+            month: "long",
+            year: "2-digit",
+          })}
+        </div>
+      </div>
+      <button onClick={() => {
+        const d = new Date(datum);
+        d.setDate(d.getDate() - 1);
+        setDatum(d.toISOString().split("T")[0]);
+      }} style={{ marginRight: "0.5rem" }}>←</button>
+      <input type="date" value={datum} onChange={(e) => setDatum(e.target.value)} />
+      <button onClick={() => {
+        const d = new Date(datum);
+        d.setDate(d.getDate() + 1);
+        setDatum(d.toISOString().split("T")[0]);
+      }} style={{ marginLeft: "0.5rem" }}>→</button>
+      {!showStartzeitInput ? (
+        <button onClick={beginSetStartzeit} style={{ marginLeft: "1rem" }}>
+          Startzeit setzen
+        </button>
+      ) : (
+        <span style={{ marginLeft: "1rem" }}>
+          <input
+            type="time"
+            value={manualStartzeit}
+            onChange={(e) => setManualStartzeit(e.target.value)}
+          />
+          <button onClick={saveManualStartzeit}>Speichern</button>
+        </span>
+      )}
+      {/* Endzeit Button und Eingabefeld */}
+      {!showEndzeitInput ? (
+        <button onClick={beginSetEndzeit} style={{ marginLeft: "1rem" }}>
+          Endzeit setzen
+        </button>
+      ) : (
+        <span style={{ marginLeft: "1rem" }}>
+          <input
+            type="time"
+            value={manualEndzeit}
+            onChange={(e) => setManualEndzeit(e.target.value)}
+          />
+          <button onClick={saveManualEndzeit}>Speichern</button>
+        </span>
+      )}
+      <button
+        onClick={() => {
+          const now = new Date();
+          now.setMinutes(Math.ceil(now.getMinutes() / 15) * 15);
+          const h = String(now.getHours()).padStart(2, "0");
+          const m = String(now.getMinutes()).padStart(2, "0");
+
+          const start = `${h}:${m}`;
+
+          const endDate = new Date(now.getTime() + 30 * 60000);
+          const eh = String(endDate.getHours()).padStart(2, "0");
+          const em = String(endDate.getMinutes()).padStart(2, "0");
+
+          const ende = `${eh}:${em}`;
+
+          setIsAbwesenheit(false);
+          setNewEntry({ titel: "", start, ende });
+          setShowForm(true);
+        }}
+        style={{ marginLeft: "1rem" }}
+      >
+        Eintrag hinzufügen
+      </button>
+
+
+      <div style={{ display: "grid", gridTemplateColumns: "1fr 60px 1fr", marginTop: "2rem" }}>
+        {/* Abwesenheiten */}
+        <div
+          style={{ padding: "1rem", borderRight: "1px solid #ccc", position: "relative" }}
+          onClick={(e) => {
+            if (e.target.closest('[data-entry]') || e.target.closest('[data-form]')) return;
+            const containerTop = e.currentTarget.getBoundingClientRect().top;
+            const clickY = e.clientY - containerTop;
+            const rawMin = Math.floor(clickY / pixelsPerMinute + 300 - 24);
+            const clickedMin = Math.round(rawMin / 15) * 15;
+            const startH = String(Math.floor(clickedMin / 60)).padStart(2, "0");
+            const startM = String(clickedMin % 60).padStart(2, "0");
+            const endMin = clickedMin + 30;
+            const endH = String(Math.floor(endMin / 60)).padStart(2, "0");
+            const endM = String(endMin % 60).padStart(2, "0");
+            setIsAbwesenheit(true);
+            setNewEntry({ titel: "", start: `${startH}:${startM}`, ende: `${endH}:${endM}` });
+            setShowForm(true);
+          }}
+        >
+          {data.abwesenheiten.map((a) => {
+            const startParts = a.start.split(":");
+            const startMin = parseInt(startParts[0]) * 60 + parseInt(startParts[1]);
+            if (editAbwesenheitId === a.id) {
+              return (
+                <div
+                  key={a.id}
+                  data-entry
+                  style={{ background: "#ffe5e5", padding: "0.5rem", margin: "0.5rem 0" }}
+                  tabIndex={0}
+                  onKeyDown={(e) => {
+                    if (e.key === "Enter") handleSaveEdit("abwesenheit");
+                    if (e.key === "Escape") {
+                      setEditAbwesenheitId(null);
+                      setEditForm({ titel: "", start: "", ende: "" });
+                    }
+                  }}
+                >
+                  <input
+                    type="text"
+                    value={editForm.titel}
+                    onChange={(e) => setEditForm({ ...editForm, titel: e.target.value })}
+                  />
+                  <br />
+                  <input
+                    type="time"
+                    value={editForm.start}
+                    onChange={(e) => setEditForm({ ...editForm, start: e.target.value })}
+                  />
+                  <input
+                    type="time"
+                    value={editForm.ende}
+                    onChange={(e) => setEditForm({ ...editForm, ende: e.target.value })}
+                  />
+                  <br />
+                  <button onClick={() => handleSaveEdit("abwesenheit")}>Speichern</button>
+                  <button onClick={() => deleteEntry(a.id, "abwesenheit")}>Löschen</button>
+                </div>
+              );
+            }
+            const endParts = a.ende.split(":");
+            const endMin = parseInt(endParts[0]) * 60 + parseInt(endParts[1]);
+            const top = (startMin - 300 + 24) * pixelsPerMinute; // 5:00 = 300 min, +24 min Offset
+            const height = (endMin - startMin) * pixelsPerMinute;
+            return (
+              <div
+                key={a.id}
+                data-entry
+                title={`${a.titel} (${a.start}–${a.ende})`}
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  height: `${height}px`,
+                  left: 0,
+                  right: 0,
+                  background: "#ffcccc",
+                  boxShadow: "inset 0 0 0 2px #999",
+                  boxSizing: "border-box",
+                  padding: "0.25rem",
+                  margin: "0.1rem",
+                  cursor: "pointer",
+                  overflow: "hidden",
+                  textOverflow: "ellipsis",
+                  whiteSpace: "nowrap",
+                  fontSize: height < 20 ? "0.6rem" : "0.8rem",
+                  lineHeight: "1.2"
+                }}
+                onClick={() => startEdit(a, "abwesenheit")}
+              >
+                <strong>{a.titel}</strong> {a.start}–{a.ende} ({height / pixelsPerMinute > 120
+                  ? `${(height / pixelsPerMinute / 60).toFixed(1)} Std`
+                  : `${height / pixelsPerMinute} Min`})
+              </div>
+            );
+          })}
+
+          {/* Formular für neuen Eintrag in Abwesenheiten-Spalte anzeigen, nur wenn isAbwesenheit === true */}
+          {showForm && isAbwesenheit && newEntry.start && (() => {
+            const startParts = newEntry.start.split(":");
+            const startMin = parseInt(startParts[0]) * 60 + parseInt(startParts[1]);
+            const top = (startMin - 300 + 24) * pixelsPerMinute;
+            return (
+              <div
+                ref={newEntryRef}
+                data-form
+                tabIndex={0}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") {
+                    handleSaveNew();
+                  }
+                  if (e.key === "Escape") {
+                    setShowForm(false);
+                    setNewEntry({ titel: "", start: "", ende: "" });
+                  }
+                }}
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  height: "60px",
+                  minHeight: "60px",
+                  left: 0,
+                  right: 0,
+                  background: "#ffe5e5",
+                  boxShadow: "inset 0 0 0 2px #999",
+                  boxSizing: "border-box",
+                  padding: "0.25rem",
+                  zIndex: 5
+                }}
+              >
+                <input
+                  ref={newEntryInputRef}
+                  autoFocus
+                  type="text"
+                  placeholder="Titel"
+                  value={newEntry.titel}
+                  onChange={(e) => setNewEntry({ ...newEntry, titel: e.target.value })}
+                />
+                <br />
+                <input
+                  type="time"
+                  value={newEntry.start}
+                  onChange={(e) => setNewEntry({ ...newEntry, start: e.target.value })}
+                />
+                <input
+                  type="time"
+                  value={newEntry.ende}
+                  onChange={(e) => setNewEntry({ ...newEntry, ende: e.target.value })}
+                />
+                <br />
+                <button onClick={handleSaveNew}>Speichern</button>
+              </div>
+            );
+          })()}
+        </div>
+
+        {/* Zeitachse */}
+        <div
+          ref={zeitachseRef}
+          style={{
+            height: "1020px",
+            padding: "1rem",
+            borderLeft: "1px solid #aaa",
+            borderRight: "1px solid #aaa",
+            textAlign: "right",
+            position: "relative"
+          }}
+        >
+          {Array.from({ length: 17 }, (_, i) => {
+            const hour = i + 5;
+            return (
+              <div key={hour} style={{ height: "60px", fontSize: "12px", color: "#666" }}>
+                {hour}:00
+              </div>
+            );
+          })}
+        </div>
+
+        {/* Zeitslots */}
+        <div ref={zeitachseRef} style={{ padding: "1rem", position: "relative", height: "100%" }}>
+          {/* Abwesenheiten als Sperrflächen */}
+          {data.abwesenheiten.map((a) => {
+            const startParts = a.start.split(":");
+            const endParts = a.ende.split(":");
+            const startMin = parseInt(startParts[0]) * 60 + parseInt(startParts[1]);
+            const endMin = parseInt(endParts[0]) * 60 + parseInt(endParts[1]);
+            const top = (startMin - 300 + 24) * pixelsPerMinute;
+            const height = (endMin - startMin) * pixelsPerMinute;
+            return (
+              <div
+                key={`sperre-${a.id}`}
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  height: `${height}px`,
+                  left: 0,
+                  right: 0,
+                  background: "rgba(255, 200, 200, 0.4)",
+                  pointerEvents: "none",
+                  zIndex: 1,
+                }}
+              />
+            );
+          })}
+          {(() => {
+            const today = new Date().toISOString().split("T")[0];
+            if (datum !== today) return null;
+
+            const now = new Date();
+            const nowMin = now.getHours() * 60 + now.getMinutes();
+            if (nowMin < 300 || nowMin > 1260) return null; // außerhalb des sichtbaren Zeitbereichs
+
+            const top = (nowMin - 300 + 24) * pixelsPerMinute;
+
+            return (
+              <div
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  left: 0,
+                  right: 0,
+                  height: "2px",
+                  backgroundColor: "lightblue",
+                  zIndex: 10
+                }}
+              />
+            );
+          })()}
+          {startzeit && (() => {
+            const startzeitMin = parseInt(startzeit.split(":")[0]) * 60 + parseInt(startzeit.split(":")[1]);
+            const startzeitTop = (startzeitMin - 300 + 24) * pixelsPerMinute;
+            const top = 0;
+            const height = startzeitTop;
+            return (
+              <div
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  height: `${height}px`,
+                  left: 0,
+                  right: 0,
+                  background: "#eee",
+                  borderBottom: "2px solid red",
+                  boxSizing: "border-box",
+                }}
+              />
+            );
+          })()}
+          {endzeit && (() => {
+            const endzeitMin = parseInt(endzeit.split(":")[0]) * 60 + parseInt(endzeit.split(":")[1]);
+            const endzeitTop = (endzeitMin - 300 + 24) * pixelsPerMinute;
+            const bottomMin = 1260; // 21:00 Uhr
+            const height = (bottomMin - endzeitMin) * pixelsPerMinute;
+            return (
+              <div
+                style={{
+                  position: "absolute",
+                  top: `${endzeitTop}px`,
+                  height: `${height}px`,
+                  left: 0,
+                  right: 0,
+                  background: "#eee",
+                  borderTop: "2px solid red",
+                  boxSizing: "border-box",
+                }}
+              />
+            );
+          })()}
+          {data.zeitslots
+            .sort((a, b) => {
+              const aStart = parseInt(a.start.split(":")[0]) * 60 + parseInt(a.start.split(":")[1]);
+              const bStart = parseInt(b.start.split(":")[0]) * 60 + parseInt(b.start.split(":")[1]);
+              return aStart - bStart;
+            })
+            .flatMap((z, index, arr) => {
+              const startParts = z.start.split(":");
+              const endParts = z.ende.split(":");
+              const startMin = parseInt(startParts[0]) * 60 + parseInt(startParts[1]);
+              const endMin = parseInt(endParts[0]) * 60 + parseInt(endParts[1]);
+
+              const startTotalMin = parseInt(startzeit?.split(":")[0]) * 60 + parseInt(startzeit?.split(":")[1]);
+              const endTotalMin = parseInt(endzeit?.split(":")[0]) * 60 + parseInt(endzeit?.split(":")[1]);
+
+              if (startMin < startTotalMin || endMin > endTotalMin) return [];
+
+              const top = (startMin - 300 + 24) * pixelsPerMinute;
+              const height = (endMin - startMin) * pixelsPerMinute;
+
+              if (editZeitslotId === z.id) {
+                // Edit-Modus: Formular an exakter Slot-Position anzeigen
+                return [
+                  <div
+                    key={z.id}
+                    style={{
+                      position: "absolute",
+                      top: `${top}px`,
+                      height: `${height}px`,
+                      minHeight: "60px",
+                      left: 0,
+                      right: 0,
+                      background: editForm.farbe || "#e5ffe5",
+                      boxShadow: "inset 0 0 0 2px #999",
+                      boxSizing: "border-box",
+                      padding: "0.25rem",
+                      margin: "0.1rem",
+                      fontSize: height < 20 ? "0.6rem" : "0.8rem",
+                      lineHeight: "1.2",
+                      overflow: "auto",
+                      zIndex: 5
+                    }}
+                    tabIndex={0}
+                    onKeyDown={(e) => {
+                      if (e.key === "Enter") handleSaveEdit("zeitslot");
+                      if (e.key === "Escape") {
+                        setEditZeitslotId(null);
+                        setEditForm({ titel: "", start: "", ende: "" });
+                      }
+                    }}
+                  >
+                    <input
+                      type="text"
+                      value={editForm.titel}
+                      onChange={(e) => setEditForm({ ...editForm, titel: e.target.value })}
+                    />
+                    <br />
+                    <input
+                      type="time"
+                      value={editForm.start}
+                      onChange={(e) => setEditForm({ ...editForm, start: e.target.value })}
+                    />
+                    <input
+                      type="time"
+                      value={editForm.ende}
+                      onChange={(e) => setEditForm({ ...editForm, ende: e.target.value })}
+                    />
+                    <div style={{ marginTop: "0.5rem" }}>
+                    <button
+                      onClick={() => setEditForm({ ...editForm, farbe: "#ccffcc" })}
+                      style={{
+                        background: z.farbe || "#ccffcc",
+                        border: "1px solid #999",
+                        marginRight: "0.5rem",
+                        width: "20px",
+                        height: "20px",
+                        cursor: "pointer"
+                      }}
+                    />
+                    <button
+                      onClick={() => setEditForm({ ...editForm, farbe: "#ccccff" })}
+                      style={{
+                        background: "#ccccff",
+                        border: "1px solid #999",
+                        width: "20px",
+                        height: "20px",
+                        cursor: "pointer"
+                      }}
+                    />
+                  </div>
+                    <br />
+                    <button onClick={() => handleSaveEdit("zeitslot")}>Speichern</button>
+                    <button onClick={() => deleteEntry(z.id, "zeitslot")}>Löschen</button>
+                  </div>
+                ];
+              }
+
+              const entry = (
+                <div
+                  key={z.id}
+                  title={`${z.titel} (${z.start}–${z.ende})`}
+                  style={{
+                    position: "absolute",
+                    top: `${top}px`,
+                    height: `${height}px`,
+                    left: 0,
+                    right: 0,
+                    background: z.farbe || "#ccffcc",
+                    boxShadow: "inset 0 0 0 2px #999",
+                    boxSizing: "border-box",
+                    padding: "0.25rem",
+                    margin: "0.1rem",
+                    cursor: "pointer",
+                    overflow: "hidden",
+                    textOverflow: "ellipsis",
+                    whiteSpace: "nowrap",
+                    fontSize: height < 20 ? "0.6rem" : "0.8rem",
+                    lineHeight: "1.2"
+                  }}
+                  onClick={() => startEdit(z, "zeitslot")}
+                >
+                  <strong>{z.titel}</strong> {z.start}–{z.ende} ({height / pixelsPerMinute > 120
+                    ? `${(height / pixelsPerMinute / 60).toFixed(1)} Std`
+                    : `${height / pixelsPerMinute} Min`})
+                </div>
+              );
+
+              // Block für freie Zeit zwischen Startzeit und erstem Zeitslot
+              if (index === 0 && startzeit) {
+                const startzeitMin = parseInt(startzeit.split(":")[0]) * 60 + parseInt(startzeit.split(":")[1]);
+                const gapStart = startMin - startzeitMin;
+                if (gapStart > 0) {
+                  const gapTop = (startzeitMin - 300 + 24) * pixelsPerMinute;
+                  const gapHeight = gapStart * pixelsPerMinute;
+                  return [
+                    <div
+                      key={`gap-start-${z.id}`}
+                      style={{
+                        position: "absolute",
+                        top: `${gapTop}px`,
+                        height: `${gapHeight}px`,
+                        left: 0,
+                        right: 0,
+                        textAlign: "center",
+                        fontSize: "0.6rem",
+                        color: "#999",
+                        pointerEvents: "none"
+                      }}
+                    >
+                      {gapStart} Min frei
+                    </div>,
+                    entry
+                  ];
+                }
+              }
+
+              if (index === 0) return [entry];
+              return [entry];
+            })}
+          {/* Freie Zeitblöcke zwischen Sperrbereichen und Zeitslots */}
+          {(() => {
+            const combined = [
+              ...data.abwesenheiten.map((a) => ({
+                id: a.id,
+                start: a.start,
+                ende: a.ende,
+                typ: "sperre"
+              })),
+              ...data.zeitslots.map((z) => ({
+                id: z.id,
+                start: z.start,
+                ende: z.ende,
+                typ: "zeitslot"
+              }))
+            ];
+
+            const startzeitMin = parseInt(startzeit?.split(":")[0]) * 60 + parseInt(startzeit?.split(":")[1]);
+            const endzeitMin = parseInt(endzeit?.split(":")[0]) * 60 + parseInt(endzeit?.split(":")[1]);
+
+            const sorted = combined
+              .map((e) => ({
+                ...e,
+                startMin: parseInt(e.start.split(":")[0]) * 60 + parseInt(e.start.split(":")[1]),
+                endMin: parseInt(e.ende.split(":")[0]) * 60 + parseInt(e.ende.split(":")[1])
+              }))
+              .filter((e) => e.startMin >= startzeitMin && e.endMin <= endzeitMin)
+              .sort((a, b) => a.startMin - b.startMin);
+
+            const gaps = [];
+
+            // Lücke zwischen Startzeit und erstem Eintrag anzeigen
+            if (sorted.length > 0 && startzeitMin < sorted[0].startMin) {
+              const first = sorted[0];
+              const gap = first.startMin - startzeitMin;
+              if (gap > 0) {
+                const gapTop = (startzeitMin - 300 + 24) * pixelsPerMinute;
+                const gapHeight = gap * pixelsPerMinute;
+                gaps.push(
+                  <div
+                    key={`gap-before-first-${first.id}`}
+                    onClick={() => {
+                      setIsAbwesenheit(false);
+                      setShowForm(true);
+                      const startStunde = String(Math.floor(startzeitMin / 60)).padStart(2, "0");
+                      const startMinute = String(startzeitMin % 60).padStart(2, "0");
+                      const endStunde = String(Math.floor(first.startMin / 60)).padStart(2, "0");
+                      const endMinute = String(first.startMin % 60).padStart(2, "0");
+                      setNewEntry({
+                        titel: "",
+                        start: `${startStunde}:${startMinute}`,
+                        ende: `${endStunde}:${endMinute}`
+                      });
+                    }}
+                    style={{
+                      position: "absolute",
+                      top: `${gapTop}px`,
+                      height: `${gapHeight}px`,
+                      left: 0,
+                      right: 0,
+                      textAlign: "center",
+                      fontSize: "0.6rem",
+                      color: "#999",
+                      pointerEvents: "auto",
+                      zIndex: 2,
+                      cursor: "pointer",
+                      background: "rgba(200, 255, 200, 0.05)"
+                    }}
+                  >
+                    {gap} Min frei
+                  </div>
+                );
+              }
+            }
+
+            for (let i = 0; i < sorted.length - 1; i++) {
+              const curr = sorted[i];
+              const next = sorted[i + 1];
+              const gap = next.startMin - curr.endMin;
+              if (gap > 0) {
+                const gapTop = (curr.endMin - 300 + 24) * pixelsPerMinute;
+                const gapHeight = gap * pixelsPerMinute;
+                gaps.push(
+                  <div
+                    key={`gap-combined-${curr.id}-${next.id}`}
+                    onClick={() => {
+                      setIsAbwesenheit(false);
+                      setShowForm(true);
+                      const startStunde = Math.floor(curr.endMin / 60).toString().padStart(2, "0");
+                      const startMinute = (curr.endMin % 60).toString().padStart(2, "0");
+                      const endStunde = Math.floor(next.startMin / 60).toString().padStart(2, "0");
+                      const endMinute = (next.startMin % 60).toString().padStart(2, "0");
+                      setNewEntry({
+                        titel: "",
+                        start: `${startStunde}:${startMinute}`,
+                        ende: `${endStunde}:${endMinute}`
+                      });
+                    }}
+                    style={{
+                      position: "absolute",
+                      top: `${gapTop}px`,
+                      height: `${gapHeight}px`,
+                      left: 0,
+                      right: 0,
+                      textAlign: "center",
+                      fontSize: "0.6rem",
+                      color: "#999",
+                      pointerEvents: "auto",
+                      zIndex: 2,
+                      cursor: "pointer",
+                      background: "rgba(200, 255, 200, 0.05)"
+                    }}
+                  >
+                    {gap} Min frei
+                  </div>
+                );
+              }
+            }
+
+            // Lücke nach dem letzten Eintrag bis zur Endzeit anzeigen
+            if (sorted.length > 0 && endzeitMin) {
+              const last = sorted[sorted.length - 1];
+              const gap = endzeitMin - last.endMin;
+              if (gap > 0) {
+                const gapTop = (last.endMin - 300 + 24) * pixelsPerMinute;
+                const gapHeight = gap * pixelsPerMinute;
+                gaps.push(
+                  <div
+                    key={`gap-after-last-${last.id}`}
+                    onClick={() => {
+                      setIsAbwesenheit(false);
+                      setShowForm(true);
+                      const startStunde = Math.floor(last.endMin / 60).toString().padStart(2, "0");
+                      const startMinute = (last.endMin % 60).toString().padStart(2, "0");
+                      const endStunde = Math.floor(endzeitMin / 60).toString().padStart(2, "0");
+                      const endMinute = (endzeitMin % 60).toString().padStart(2, "0");
+                      setNewEntry({
+                        titel: "",
+                        start: `${startStunde}:${startMinute}`,
+                        ende: `${endStunde}:${endMinute}`
+                      });
+                    }}
+                    style={{
+                      position: "absolute",
+                      top: `${gapTop}px`,
+                      height: `${gapHeight}px`,
+                      left: 0,
+                      right: 0,
+                      textAlign: "center",
+                      fontSize: "0.6rem",
+                      color: "#999",
+                      pointerEvents: "auto",
+                      zIndex: 2,
+                      cursor: "pointer",
+                      background: "rgba(200, 255, 200, 0.05)"
+                    }}
+                  >
+                    {gap} Min frei
+                  </div>
+                );
+              }
+            }
+
+            return gaps;
+          })()}
+          {/* Formular für neuen Eintrag an passender Stelle anzeigen (nur wenn isAbwesenheit === false) */}
+          {showForm && !isAbwesenheit && newEntry.start && (() => {
+            const startParts = newEntry.start.split(":");
+            const startMin = parseInt(startParts[0]) * 60 + parseInt(startParts[1]);
+            const top = (startMin - 300 + 24) * pixelsPerMinute;
+            return (
+              <div
+                ref={newEntryRef}
+                tabIndex={0}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") {
+                    handleSaveNew();
+                  }
+                  if (e.key === "Escape") {
+                    setShowForm(false);
+                    setNewEntry({ titel: "", start: "", ende: "", farbe: "#ccffcc" });
+                  }
+                }}
+                style={{
+                  position: "absolute",
+                  top: `${top}px`,
+                  height: "60px",
+                  minHeight: "60px",
+                  left: 0,
+                  right: 0,
+                  // background: "#e0f7ff",
+                  background: newEntry.farbe || "#e0f7ff",
+                  boxShadow: "inset 0 0 0 2px #999",
+                  boxSizing: "border-box",
+                  padding: "0.25rem",
+                  zIndex: 5
+                }}
+              >
+                <input
+                  ref={newEntryInputRef}
+                  autoFocus
+                  type="text"
+                  placeholder="Titel"
+                  value={newEntry.titel}
+                  onChange={(e) => setNewEntry({ ...newEntry, titel: e.target.value })}
+                />
+                <br />
+                <input
+                  type="time"
+                  value={newEntry.start}
+                  onChange={(e) => setNewEntry({ ...newEntry, start: e.target.value })}
+                />
+                <input
+                  type="time"
+                  value={newEntry.ende}
+                  onChange={(e) => setNewEntry({ ...newEntry, ende: e.target.value })}
+                />
+                <div style={{ marginTop: "0.5rem" }}>
+                  <button
+                    onClick={() => setNewEntry({ ...newEntry, farbe: "#ccffcc" })}
+                    style={{
+                      background: "#ccffcc",
+                      border: "1px solid #999",
+                      marginRight: "0.5rem",
+                      width: "20px",
+                      height: "20px",
+                      cursor: "pointer"
+                    }}
+                  />
+                  <button
+                    onClick={() => setNewEntry({ ...newEntry, farbe: "#ccccff" })}
+                    style={{
+                      background: "#ccccff",
+                      border: "1px solid #999",
+                      width: "20px",
+                      height: "20px",
+                      cursor: "pointer"
+                    }}
+                  />
+                </div>
+                <br />
+                <button
+                  onClick={handleSaveNew}
+                >
+                  Speichern
+                </button>
+              </div>
+            );
+          })()}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default App;

frontend/src/App.test.js

@@ -0,0 +1,8 @@
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

frontend/src/index.css

@@ -0,0 +1,13 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

frontend/src/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import './index.css';
+import App from './App';
+import reportWebVitals from './reportWebVitals';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

frontend/src/logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>

frontend/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

frontend/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';