feat: Initial implementation of Annas Rechnungsmanager
Full-stack German accounting & invoice management web application: - Multi-company management (Mandantenverwaltung) with full CRUD - Invoice creation with dynamic line items and automatic tax calculation - Sequential invoice numbering per company (RE-2024-001 format) - §14 UStG compliant PDF invoice generation via @react-pdf/renderer - Customer management (Kundenverwaltung) per company - Tax reports: quarterly USt-Voranmeldung and monthly revenue overview - Email/password authentication via NextAuth.js v5 - Responsive, modern UI with Tailwind CSS and custom shadcn/ui components - Prisma v5 ORM with MySQL/MariaDB schema + demo seed data Stack: Next.js 14 (App Router) · TypeScript · Prisma/MySQL · NextAuth.js https://claude.ai/code/session_01FN53KKxo5ebrGwqFhxzkT9
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Claude
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generator client {
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provider = "prisma-client-js"
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}
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datasource db {
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provider = "mysql"
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url = env("DATABASE_URL")
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}
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model User {
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id String @id @default(cuid())
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email String @unique
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passwordHash String
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name String
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createdAt DateTime @default(now())
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updatedAt DateTime @updatedAt
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companies Company[]
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@@map("users")
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}
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model Company {
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id String @id @default(cuid())
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name String
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legalForm String?
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taxId String?
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vatId String?
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address String
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zip String
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city String
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country String @default("DE")
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email String?
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phone String?
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website String?
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bankIban String?
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bankBic String?
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bankName String?
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invoicePrefix String @default("RE")
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invoiceSequence Int @default(0)
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userId String
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user User @relation(fields: [userId], references: [id], onDelete: Cascade)
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customers Customer[]
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invoices Invoice[]
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createdAt DateTime @default(now())
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updatedAt DateTime @updatedAt
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@@map("companies")
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}
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model Customer {
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id String @id @default(cuid())
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companyId String
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company Company @relation(fields: [companyId], references: [id], onDelete: Cascade)
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name String
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vatId String?
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taxId String?
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address String
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zip String
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city String
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country String @default("DE")
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email String?
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phone String?
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invoices Invoice[]
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createdAt DateTime @default(now())
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updatedAt DateTime @updatedAt
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@@map("customers")
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}
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model Invoice {
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id String @id @default(cuid())
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number String
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companyId String
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company Company @relation(fields: [companyId], references: [id], onDelete: Cascade)
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customerId String
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customer Customer @relation(fields: [customerId], references: [id])
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issueDate DateTime
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deliveryDate DateTime?
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dueDate DateTime
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status InvoiceStatus @default(DRAFT)
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notes String? @db.Text
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items InvoiceItem[]
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netTotal Decimal @db.Decimal(10, 2)
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taxTotal Decimal @db.Decimal(10, 2)
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grossTotal Decimal @db.Decimal(10, 2)
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createdAt DateTime @default(now())
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updatedAt DateTime @updatedAt
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@@unique([companyId, number])
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@@map("invoices")
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}
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enum InvoiceStatus {
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DRAFT
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SENT
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PAID
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CANCELLED
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}
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model InvoiceItem {
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id String @id @default(cuid())
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invoiceId String
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invoice Invoice @relation(fields: [invoiceId], references: [id], onDelete: Cascade)
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position Int
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description String @db.Text
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quantity Decimal @db.Decimal(10, 3)
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unit String?
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unitPrice Decimal @db.Decimal(10, 2)
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taxRate Decimal @db.Decimal(5, 2)
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netAmount Decimal @db.Decimal(10, 2)
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taxAmount Decimal @db.Decimal(10, 2)
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grossAmount Decimal @db.Decimal(10, 2)
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@@map("invoice_items")
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}
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+112
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import { PrismaClient } from "@prisma/client";
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import bcrypt from "bcryptjs";
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const prisma = new PrismaClient();
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async function main() {
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console.log("Seeding database...");
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// Create demo user
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const passwordHash = await bcrypt.hash("demo123", 12);
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const user = await prisma.user.upsert({
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where: { email: "anna@example.de" },
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update: {},
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create: {
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email: "anna@example.de",
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passwordHash,
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name: "Anna Musterfrau",
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},
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});
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console.log(`✓ User created: ${user.email}`);
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// Create demo company
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const company = await prisma.company.upsert({
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where: { id: "demo-company-1" },
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update: {},
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create: {
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id: "demo-company-1",
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name: "Muster GmbH",
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legalForm: "GmbH",
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taxId: "123/456/78901",
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vatId: "DE123456789",
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address: "Musterstraße 1",
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zip: "10115",
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city: "Berlin",
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email: "info@muster-gmbh.de",
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phone: "+49 30 12345678",
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bankName: "Musterbank",
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bankIban: "DE89 3704 0044 0532 0130 00",
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bankBic: "COBADEFFXXX",
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invoicePrefix: "RE",
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userId: user.id,
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},
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});
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console.log(`✓ Company created: ${company.name}`);
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// Create demo customer
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const customer = await prisma.customer.upsert({
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where: { id: "demo-customer-1" },
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update: {},
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create: {
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id: "demo-customer-1",
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companyId: company.id,
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name: "Beispiel AG",
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vatId: "DE987654321",
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address: "Beispielweg 5",
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zip: "20095",
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city: "Hamburg",
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email: "kontakt@beispiel-ag.de",
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},
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});
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console.log(`✓ Customer created: ${customer.name}`);
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// Create demo invoice
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const invoice = await prisma.invoice.create({
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data: {
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number: "RE-2024-001",
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companyId: company.id,
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customerId: customer.id,
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issueDate: new Date("2024-01-15"),
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deliveryDate: new Date("2024-01-15"),
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dueDate: new Date("2024-02-14"),
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status: "SENT",
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netTotal: 1000.0,
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taxTotal: 190.0,
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grossTotal: 1190.0,
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items: {
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create: [
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{
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position: 1,
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description: "Buchhaltungsleistungen Januar 2024",
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quantity: 10,
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unit: "h",
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unitPrice: 100.0,
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taxRate: 19.0,
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netAmount: 1000.0,
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taxAmount: 190.0,
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grossAmount: 1190.0,
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},
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],
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},
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},
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});
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console.log(`✓ Invoice created: ${invoice.number}`);
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// Update company sequence
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await prisma.company.update({
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where: { id: company.id },
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data: { invoiceSequence: 1 },
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});
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console.log("\n✅ Seed complete!");
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console.log("Login: anna@example.de / demo123");
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}
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main()
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.catch((e) => {
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console.error(e);
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process.exit(1);
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})
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.finally(async () => {
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await prisma.$disconnect();
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});
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