Merge branch 'backend'

# Conflicts:
#	.gitignore
#	db_scripts/create.sql

.gitignore

@@ -1,2 +1,4 @@
 .idea
 db/*
+backend/target/*
+

Frontend-user/README.md

@@ -14,3 +14,21 @@ A few resources to get you started if this is your first Flutter project:
 For help getting started with Flutter development, view the
 [online documentation](https://docs.flutter.dev/), which offers tutorials,
 samples, guidance on mobile development, and a full API reference.
+
+## toDo
+
+- Einstellungen
+    - darkmode
+    - Secure Storage: https://pub.dev/packages/flutter_secure_storage
+- Einkauf
+- Finance
+    - Einkaufskorb editieren
+        - nur 1 Monat lang möglich
+        - Speichern des veränderten Warenkorbs
+        - redesign (statefull)
+    - farbliche Hervorhebungen
+    - ausstehende Beträge für monatliche Aufladungen
+        - eventuell muss sample data angepasst werden
+- pre-Release:
+    - semanticLabels, Screenreader-Support
+    - Error-Management (throws)

Frontend-user/lib/basket.dart

@@ -1,32 +1,75 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'sample_data.dart';
 
-/* todo:
-  - Flag für Ansicht/Bearbeitung
-  - individuelle Icons je nach Kategorie
-  - Pfand
-  - Gesamtpreis
-*/
-
 class ShowBasket extends StatelessWidget {
-  ShowBasket({super.key});
+  final Basket basket;
+  final bool editable;
+  const ShowBasket(this.basket, {this.editable = false, super.key});
 
   @override
   Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Expanded(
+          child: getBasket(basket),
+        ),
+        const Divider(),
+        ListTile(
+            leading: const Icon(
+              Icons.euro,
+            ),
+            title: const Text(
+              'Kosten:',
+            ),
+            subtitle: Text(
+              '${basket.price}',
+            ),
+            trailing: editable
+                ? Row(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      FloatingActionButton(
+                          backgroundColor: Colors.redAccent.shade100,
+                          child: const Icon(Icons.remove_shopping_cart),
+                          onPressed: () {}),
+                      const SizedBox(
+                        width: 10,
+                      ),
+                      FloatingActionButton(
+                          child: const Icon(Icons.shopping_cart_checkout),
+                          onPressed: () {}),
+                    ],
+                  )
+                : null),
+      ],
+    );
+  }
+
+  ListView getBasket(Basket basket) {
     return ListView.builder(
-      itemCount: null,
+      itemCount: basket.purchases.length,
       itemBuilder: (context, index) {
-        if (index < SampleData().basket.purchases.length) {
         return Card(
           child: ListTile(
-              leading: const Icon(Icons.abc),
+              leading: Text(
-              title: Text(SampleData().basket.purchases[index].product.name),
+                basket.purchases.keys.elementAt(index).category.icon,
-              //trailing: Text(),
+                style: const TextStyle(fontSize: 24),
               ),
+              title: Text(basket.purchases.keys.elementAt(index).name),
+              subtitle: Text(
+                  '${basket.purchases.values.elementAt(index)} ${basket.purchases.keys.elementAt(index).unit}'),
+              trailing: editable
+                  ? SizedBox(
+                      width: 100,
+                      child: TextField(
+                          keyboardType: TextInputType.number,
+                          inputFormatters: <TextInputFormatter>[
+                            FilteringTextInputFormatter.digitsOnly
+                          ]),
+                    )
+                  : null),
         );
-        } else {
-          return null;
-        }
       },
     );
   }

Frontend-user/lib/finance.dart

@@ -4,22 +4,13 @@ import 'package:intl/date_symbol_data_local.dart';
 import 'basket.dart';
 import 'sample_data.dart';
 
-/*
-todo:
-  - Einkauf und Settings
-  - Warenkorb
-  - Aufladungen?
-  - farbliche Hervorhebungen
-  - semanticLabels, Screenreader
-  - monatliche Aufladung: ausstehende Beträge
-*/
-
 class Finance extends StatelessWidget {
   const Finance({super.key});
 
   @override
   Widget build(BuildContext context) {
     initializeDateFormatting('de_DE');
+    Intl.defaultLocale = 'de_DE';
 
     return Scaffold(
         appBar: AppBar(
@@ -38,50 +29,26 @@ class Finance extends StatelessWidget {
           ),
         ),
         body: ListView.builder(
-            itemCount: null,
+            itemCount: SampleData().transactions.length,
             itemBuilder: (context, index) {
-              if (index < SampleData().transactions.length) {
               return Card(
                   child: ListTile(
                       leading: getIcon(SampleData().transactions[index].type),
-                        title: Text(
+                      title:
-                            gettitle(SampleData().transactions[index].type)),
+                          Text(gettitle(SampleData().transactions[index].type)),
-                        subtitle: getSubtitle(index),
+                      subtitle: getSubtitle(SampleData().transactions[index]),
-                        trailing: SampleData().transactions[index].type ==
+                      trailing: getTrailing(context, index),
-                                TransaktionArt.einkauf
+                      onTap: (SampleData().transactions[index].basket != null)
-                            ? PopupMenuButton(
+                          ? () {
-                                onSelected: (value) {},
-                                itemBuilder: (BuildContext context) =>
-                                    <PopupMenuEntry<String>>[
-                                  const PopupMenuItem<String>(
-                                    value: 'Option',
-                                    child: ListTile(
-                                        leading: Icon(Icons.manage_history),
-                                        title: Text('Warenkorb bearbeiten')),
-                                  ),
-                                  const PopupMenuItem<String>(
-                                    value: 'Option',
-                                    child: ListTile(
-                                        leading:
-                                            Icon(Icons.remove_shopping_cart),
-                                        title: Text('Einkauf stornieren')),
-                                  ),
-                                ],
-                              )
-                            : null,
-                        onTap: () {
-                          if (SampleData().transactions[index].type ==
-                              TransaktionArt.einkauf) {
                               showBottomSheet(
                                   context: context,
                                   builder: (BuildContext context) {
-                                  return ShowBasket();
+                                    return ShowBasket(SampleData()
+                                        .transactions[index]
+                                        .basket!);
                                   });
                             }
-                        }));
+                          : null));
-              } else {
-                return null;
-              }
             }));
   }
 
@@ -94,17 +61,18 @@ class Finance extends StatelessWidget {
       case TransaktionArt.korrektur:
         return 'Korrektur';
       case TransaktionArt.monatlBeitrag:
-        return 'monatlicher Beitrag';
+        return 'Monatlicher Beitrag';
+      default:
+        return 'Ein Error ist aufgetreten';
     }
   }
 
-  Text getSubtitle(int index) {
+  Text getSubtitle(Transaction transaction) {
-    String text = '${SampleData().transactions[index].amount / 100}';
+    String text = '${transaction.amount / 100}';
     text += '€  ';
-    text += DateFormat("EEEE, dd. MMMM yyyy HH:mm", 'de_DE')
+    text += DateFormat("EEEE, dd. MMMM yyyy HH:mm").format(transaction.date);
-        .format(SampleData().transactions[index].date);
+    if (transaction.description != null) {
-    if (SampleData().transactions[index].description != null) {
+      (text += '\n${transaction.description}');
-      (text += '\n${SampleData().transactions[index].description}');
     }
 
     return Text(text);
@@ -116,10 +84,28 @@ class Finance extends StatelessWidget {
         return const Icon(Icons.savings);
       case TransaktionArt.einkauf:
         return const Icon(Icons.shopping_basket);
-      case TransaktionArt.korrektur:
-        return const Icon(Icons.priority_high);
       case TransaktionArt.monatlBeitrag:
         return const Icon(Icons.payment);
+      default:
+        return const Icon(Icons.priority_high);
+    }
+  }
+
+  getTrailing(BuildContext context, int index) {
+    if (SampleData().transactions[index].type == TransaktionArt.einkauf) {
+      return IconButton(
+        icon: const Icon(Icons.manage_history),
+        onPressed: () {
+          showBottomSheet(
+              context: context,
+              builder: (BuildContext context) {
+                return ShowBasket(SampleData().transactions[index].basket!,
+                    editable: true);
+              });
+        },
+      );
+    } else {
+      return null;
     }
   }
 }

Frontend-user/lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:mitgliederladen/shopping.dart';
+import 'package:mitgliederladen/settings.dart';
 import 'finance.dart';
 
 void main() {
@@ -17,17 +19,19 @@ class MyApp extends StatelessWidget {
           //darkgreen:5f7c61, mediumgreen: 66906a, lightgreen: 9cbe96, yellow: f5de64
           useMaterial3: true,
           brightness: Brightness.light,
+          textTheme: Typography.englishLike2021,
           colorScheme: ColorScheme.fromSeed(
               brightness: Brightness.light,
               seedColor: const Color(0xff5f7c61))),
       darkTheme: ThemeData(
           useMaterial3: true,
           brightness: Brightness.dark,
+          textTheme: Typography.englishLike2021,
           colorScheme: ColorScheme.fromSeed(
             brightness: Brightness.dark,
             seedColor: const Color(0xff5f7c61),
           )),
-      themeMode: ThemeMode.dark,
+      themeMode: ThemeMode.system,
       home: const MyHomePage(),
     );
   }
@@ -76,21 +80,9 @@ class _MyHomePageState extends State<MyHomePage> {
         ],
       ),
       body: <Widget>[
-        Container(
+        const Shopping(),
-          color: Colors.red,
+        const Finance(),
-          alignment: Alignment.center,
+        const Settings()
-          child: Text('Page $test'),
-        ),
-        Finance(),
-        ListView(children: const <Widget>[
-          ListTile(
-            leading: Icon(Icons.dark_mode),
-            title: Text(
-              'Hier könnten Einstellungen zu Darkmode mit shared_preferences und riverpod sein',
-              maxLines: 2,
-            ),
-          )
-        ])
       ][currentPageIndex],
     );
   }

Frontend-user/lib/sample_data.dart

@@ -1,17 +1,15 @@
-final now = DateTime.now();
+import 'package:uuid/uuid.dart';
+
+final DateTime now = DateTime.now();
 
 enum TransaktionArt { monatlBeitrag, aufladung, einkauf, korrektur }
 
 enum Unit { stueck, menge }
 
-enum Category {
+class Category {
-  obstUndGemuese,
+  final String name;
-  brotCerealienUndAufstriche,
+  final String icon;
-  getraenke,
+  const Category({required this.name, required this.icon});
-  drogerieUndHaushalt,
-  kochenUndBacken,
-  oeleSossenUndGewuerze,
-  suessesUndKnabbereien
 }
 
 class Transaction {
@@ -19,84 +17,207 @@ class Transaction {
   int amount;
   TransaktionArt type;
   DateTime date;
+  Basket? basket;
   String? description;
-  Transaction(this.type, this.amount, this.date, [this.description]);
+  Transaction(
+      {required this.type,
+      required this.amount,
+      required this.date,
+      this.description,
+      this.basket});
 }
 
 class Product {
   final int id = 0;
   final String name;
-  final Unit unit;
+  final Unit unit; //pro Kg oder Stück
-  final double price; //pro Kilogramm oder Stück
+  final double price;
   final double vat;
   final Category category;
   const Product(this.name, this.unit, this.price, this.vat, this.category);
 }
 
-class Purchase {
-  Product product;
-  int amount;
-  Purchase(this.product, this.amount);
-}
-
 class Basket {
-  List<Purchase> purchases;
+  Map<Product, int> purchases;
-  int price;
+  double price;
-  Basket(this.purchases, this.price);
+  String guid;
+  Basket(this.purchases, this.price) : guid = const Uuid().v4();
+
+  void addItem(Product product, int quantity) {
+    if (purchases.containsKey(product)) {
+      purchases.update(
+          product, (existingQuantity) => existingQuantity + quantity);
+    } else {
+      purchases[product] = quantity;
+    }
+  }
+
+  void removeItem(Product product) {
+    purchases.remove(product);
+  }
 }
 
-//sample data
 class SampleData {
-  final List<Transaction> transactions = [
+  static const List<Category> categories = [
-    Transaction(TransaktionArt.monatlBeitrag, 0, now),
+    Category(name: 'Obst und Gemüse', icon: '🍒'),
-    Transaction(TransaktionArt.aufladung, 2042, now),
+    Category(name: 'Kochen und Backen', icon: '🍝'),
-    Transaction(
+    Category(name: 'Brot, Cerealien & Aufstriche', icon: '🍞'),
-        TransaktionArt.einkauf, -2442, now.subtract(const Duration(days: 2))),
+    Category(name: 'Getränke und Pfand', icon: '🫖'),
-    Transaction(TransaktionArt.korrektur, 2332,
+    Category(name: 'Drogerie und Haushalt', icon: '🧼'),
-        now.subtract(const Duration(hours: 5)), 'Korrektur des Warenkorbs'),
+    Category(name: 'Öl, Soßen und Gewürze', icon: '🫚'),
-    Transaction(TransaktionArt.monatlBeitrag, 0, now),
+    Category(name: 'Süßes und Knabbereien', icon: '🍪')
-    Transaction(TransaktionArt.aufladung, 2042, now),
-    Transaction(
-        TransaktionArt.einkauf, -2442, now.subtract(const Duration(days: 2))),
-    Transaction(TransaktionArt.korrektur, 2332,
-        now.subtract(const Duration(hours: 5)), 'Korrektur des Warenkorbs'),
-    Transaction(TransaktionArt.monatlBeitrag, 0, now),
-    Transaction(TransaktionArt.aufladung, 2042, now),
-    Transaction(
-        TransaktionArt.einkauf, -2442, now.subtract(const Duration(days: 2))),
-    Transaction(TransaktionArt.korrektur, 2332,
-        now.subtract(const Duration(hours: 5)), 'Korrektur des Warenkorbs'),
-    Transaction(TransaktionArt.monatlBeitrag, 0, now),
-    Transaction(TransaktionArt.aufladung, 2042, now),
-    Transaction(
-        TransaktionArt.einkauf, -2442, now.subtract(const Duration(days: 2))),
-    Transaction(TransaktionArt.korrektur, 2332,
-        now.subtract(const Duration(hours: 5)), 'Korrektur des Warenkorbs'),
-    Transaction(TransaktionArt.monatlBeitrag, 0, now),
-    Transaction(TransaktionArt.aufladung, 2042, now),
-    Transaction(
-        TransaktionArt.einkauf, -2442, now.subtract(const Duration(days: 2))),
-    Transaction(TransaktionArt.korrektur, 2332,
-        now.subtract(const Duration(hours: 5)), 'Korrektur des Warenkorbs')
   ];
 
-  static const List<Product> products = [
+  static List<Product> products = [
-    Product('Apfel', Unit.stueck, 0.23, 7, Category.obstUndGemuese),
+    Product('Apfel', Unit.stueck, 0.23, 7, categories[0]),
-    Product('Mehl', Unit.menge, 0.003, 19, Category.kochenUndBacken),
+    Product('Mehl', Unit.menge, 0.003, 19, categories[1]),
-    Product('Brot', Unit.stueck, 1.23, 7, Category.brotCerealienUndAufstriche),
+    Product('Brot', Unit.stueck, 1.23, 7, categories[2]),
-    Product('Milch', Unit.stueck, 2.23, 3, Category.getraenke),
+    Product('Milch', Unit.stueck, 2.23, 3, categories[3]),
-    Product('Zahnpasta', Unit.stueck, 0.23, 7, Category.drogerieUndHaushalt),
+    Product('Zahnpasta', Unit.stueck, 0.23, 7, categories[4]),
-    Product('Pfeffer', Unit.stueck, 0.23, 7, Category.oeleSossenUndGewuerze),
+    Product('Pfeffer', Unit.stueck, 0.23, 7, categories[5]),
-    Product('Schokolade', Unit.menge, 0.23, 7, Category.suessesUndKnabbereien)
+    Product('Schokolade', Unit.menge, 0.23, 7, categories[6]),
+    Product('Flaschenpfand', Unit.stueck, -0.15, 0, categories[3])
   ];
 
-  Basket basket = Basket([
+  //such a basket can not exist later. It is for testing purposes
-    Purchase(products[0], 20),
+  // when scrolling through a long basket
-    Purchase(products[1], 2200),
+  static Basket basket = Basket({
-    Purchase(products[2], 2),
+    products[0]: 20,
-    Purchase(products[3], 1),
+    products[1]: 2200,
-    Purchase(products[4], 1),
+    products[2]: 2,
-    Purchase(products[5], 2),
+    products[3]: 1,
-    Purchase(products[6], 202)
+    products[4]: 1,
-  ], 304);
+    products[5]: 2,
+    products[6]: 222,
+    products[0]: 20,
+    products[1]: 2200,
+    products[2]: 2,
+    products[3]: 1,
+    products[4]: 1,
+    products[5]: 2,
+    products[6]: 222
+  }, 27.9);
+
+  static Basket basket2 = Basket({
+    products[0]: 22,
+    products[1]: 2241,
+    products[3]: 2,
+    products[4]: 4,
+    products[6]: 2,
+    products[7]: 5,
+  }, 34);
+
+  static Basket basket3 = Basket({
+    products[0]: 2,
+    products[1]: 21,
+    products[3]: 4,
+    products[4]: 1,
+    products[6]: 5,
+  }, -1);
+
+  List<Transaction> transactions = [
+    Transaction(
+      type: TransaktionArt.monatlBeitrag,
+      amount: 0,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.aufladung,
+      amount: 2042,
+      date: now,
+    ),
+    Transaction(
+        type: TransaktionArt.einkauf,
+        amount: -2442,
+        date: now.subtract(const Duration(days: 2)),
+        basket: basket),
+    Transaction(
+      type: TransaktionArt.korrektur,
+      amount: 2332,
+      date: now.subtract(const Duration(hours: 5)),
+      description: 'Korrektur des Warenkorbs',
+      basket: basket3,
+    ),
+    Transaction(
+      type: TransaktionArt.monatlBeitrag,
+      amount: 0,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.aufladung,
+      amount: 2042,
+      date: now,
+    ),
+    Transaction(
+        type: TransaktionArt.einkauf,
+        amount: -2442,
+        date: now.subtract(const Duration(days: 2)),
+        basket: basket2),
+    Transaction(
+        type: TransaktionArt.korrektur,
+        amount: 2332,
+        date: now.subtract(const Duration(hours: 5)),
+        description: 'Korrektur des FinanzAK'),
+    Transaction(
+      type: TransaktionArt.monatlBeitrag,
+      amount: 0,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.aufladung,
+      amount: 2042,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.einkauf,
+      amount: -2442,
+      date: now.subtract(const Duration(days: 2)),
+      basket: basket,
+    ),
+    Transaction(
+        type: TransaktionArt.korrektur,
+        amount: 2332,
+        date: now.subtract(const Duration(hours: 5)),
+        description: 'Korrektur des Warenkorbs'),
+    Transaction(
+      type: TransaktionArt.monatlBeitrag,
+      amount: 0,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.aufladung,
+      amount: 2042,
+      date: now,
+    ),
+    Transaction(
+        type: TransaktionArt.einkauf,
+        amount: -2442,
+        date: now.subtract(const Duration(days: 2)),
+        basket: basket),
+    Transaction(
+        type: TransaktionArt.korrektur,
+        amount: 2332,
+        date: now.subtract(const Duration(hours: 5)),
+        description: 'Korrektur des Warenkorbs'),
+    Transaction(
+      type: TransaktionArt.monatlBeitrag,
+      amount: 0,
+      date: now,
+    ),
+    Transaction(
+      type: TransaktionArt.aufladung,
+      amount: 2042,
+      date: now,
+    ),
+    Transaction(
+        type: TransaktionArt.einkauf,
+        amount: -2442,
+        date: now.subtract(const Duration(days: 2)),
+        basket: basket2),
+    Transaction(
+        type: TransaktionArt.korrektur,
+        amount: 2332,
+        date: now.subtract(const Duration(hours: 5)),
+        description: 'Korrektur des Warenkorbs'),
+  ];
 }

Frontend-user/lib/settings.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+
+class Settings extends StatelessWidget {
+  const Settings({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    //Hier in dem Return kann der Inhalt des Setting Tabs angepasst werden
+    return ListView(children: const <Widget>[
+      ListTile(
+        leading: Icon(Icons.dark_mode),
+        title: Text(
+          'Hier könnten Einstellungen zu Darkmode sein',
+          maxLines: 2,
+        ),
+      )
+    ]);
+  }
+}

Frontend-user/lib/shopping.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:mitgliederladen/sample_data.dart';
+
+class Shopping extends StatelessWidget {
+  const Shopping({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        floatingActionButton: FloatingActionButton(
+          child: const Icon(Icons.shopping_cart),
+          onPressed: () {},
+        ),
+        body: GridView.builder(
+            gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+                crossAxisCount: 2),
+            itemCount: SampleData.categories.length,
+            itemBuilder: ((context, index) {
+              return Card(
+                child: Column(children: [
+                  Expanded(
+                    child: FittedBox(
+                      fit: BoxFit.scaleDown,
+                      child: Text(
+                        SampleData.categories[index].icon,
+                        style: const TextStyle(fontSize: 400),
+                      ),
+                    ),
+                  ),
+                  Padding(
+                    padding: const EdgeInsets.all(8.0),
+                    child: Text(
+                      SampleData.categories[index].name,
+                      style: Theme.of(context).textTheme.labelLarge,
+                    ),
+                  ),
+                ]),
+              );
+            })));
+  }
+}

Frontend-user/pubspec.lock

@@ -41,6 +41,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.17.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -184,6 +192,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.5.1"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.2"
+  uuid:
+    dependency: "direct main"
+    description:
+      name: uuid
+      sha256: "648e103079f7c64a36dc7d39369cabb358d377078a051d6ae2ad3aa539519313"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.7"
   vector_math:
     dependency: transitive
     description:

Frontend-user/pubspec.yaml

@@ -36,6 +36,7 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
   intl: ^0.18.1
+  uuid: ^3.0.7
 
 dev_dependencies:
   flutter_test:

README.md

@@ -1,2 +1,36 @@
 # Mitgliederladen
 
+
+## Development branches
+
+backend
+: Server component, using Rust/SQL, offering API (via HTTP/2?)
+
+db_scripts
+: SQL scripts
+
+main
+: frontend client as flutter app
+
+
+
+## Tech used
+
+### Backend
+
+- Database connection using Rust-lang and SQLx
+
+- RESTful (Level 2, JSON over RPC) API using Rust-lang (and probably (actix web framework)[https://actix.rs] plus (utoipa\[sic! 🍺 beer-branded punny name\])[https://github.com/juhaku/utoipa]
+
+## Frontend
+
+- Google Flutter using Dart.
+
+Target platforms?
+
+- probably Android[^1], iOS[^2].
+- Debug target could be desktop for fastest deployment. Production targets: Perhaps desktop and/or web, if wanted.
+
+
+[1]: via APK? Via Play Store or F-Droid? Then Registration as Play store developer (for charity or one time purchase with credit card?) needed.
+[2]: Registration as Apple developer for charity needed.

db_scripts/drop.sql

@@ -0,0 +1,7 @@
+DROP TABLE IF EXISTS mitglied;
+DROP TABLE IF EXISTS transaktion_art;
+DROP TABLE IF EXISTS transaktion;
+DROP TABLE IF EXISTS monatlicher_beitrag;
+DROP TABLE IF EXISTS mwst;
+DROP TABLE IF EXISTS einheit;
+DROP TABLE IF EXISTS artikel;

server/.gitignore

@@ -0,0 +1,21 @@
+Cargo.lock
+target/
+guide/build/
+/gh-pages
+
+*.so
+*.out
+*.pyc
+*.pid
+*.sock
+*~
+.DS_Store
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# Configuration directory generated by CLion
+.idea
+
+# Configuration directory generated by VSCode
+.vscode

server/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "server"
+version = "1.0.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web ="4"
+utoipa = { version = "3", features = ["actix_extras"] }

server/readme.md

@@ -0,0 +1,15 @@
+# installation
+
+## windows (step 1)
+
+choco install -y
+
+## Linux, macos (alernate step 1)
+
+use apt, pacman, curl, brew or whatever.
+
+## Always (steps 2 and so on)
+
+- `rustup-init.sh` (Windows: rustup-init.ex, e.g. %AppData%\Local\Temp\chocolatey\rustup.install\1.25.1\rustup-init.exe)
+- select a good match in the dialog of this CLI installer
+

server/src/main.rs

@@ -0,0 +1,28 @@
+use actix_web::{get, post, web, App, HttpResponse, HttpServer, Responder};
+
+#[get("/")]
+async fn hello() -> impl Responder {
+    HttpResponse::Ok().body("Hello world!")
+}
+
+#[post("/echo")]
+async fn echo(req_body: String) -> impl Responder {
+    HttpResponse::Ok().body(req_body)
+}
+
+async fn manual_hello() -> impl Responder {
+    HttpResponse::Ok().body("Hey there!")
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    HttpServer::new(|| {
+        App::new()
+            .service(hello)
+            .service(echo)
+            .route("/hey", web::get().to(manual_hello))
+    })
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
+}