Initial commit with Email Import Wizard and Task Processor updates

paperless-backend/src/kontonummern/kontonummern.service.ts

@@ -0,0 +1,35 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { Kontonummer } from '../database/entities';
+
+@Injectable()
+export class KontonummernService {
+  constructor(
+    @InjectRepository(Kontonummer)
+    private readonly kontonummerRepo: Repository<Kontonummer>,
+  ) {}
+
+  async findByCorrespondent(correspondentId: number): Promise<Kontonummer[]> {
+    return this.kontonummerRepo.find({
+      where: { CorrespondentId: correspondentId },
+    });
+  }
+
+  async create(correspondentId: number, nummer: string): Promise<Kontonummer> {
+    const existing = await this.kontonummerRepo.findOne({
+      where: { CorrespondentId: correspondentId, Nummer: nummer },
+    });
+
+    if (existing) {
+      return existing;
+    }
+
+    const kontonummer = this.kontonummerRepo.create({
+      CorrespondentId: correspondentId,
+      Nummer: nummer,
+    });
+
+    return this.kontonummerRepo.save(kontonummer);
+  }
+}