perf: resolve correspondents via stored AgrarmonitorId instead of name lookup

- getOrCreateCorrespondent first checks CorrespondentSetting by kundenId
- Falls back to name search only when no mapping exists
- Saves the mapping after creation for future polling runs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

paperless-backend/src/agrarmonitor/agrarmonitor-polling.service.ts

@@ -143,7 +143,7 @@ export class AgrarmonitorPollingService implements OnModuleInit {
         (c) => Number(c['ist_lieferant']) === 1 && Number(c['ist_aktiv']) === 1,
       )) {
         try {
-          await this.getOrCreateCorrespondent(customer);
+          await this.getOrCreateCorrespondent(customer, Number(customer.id));
         } catch (err: unknown) {
           this.logger.warn(`Korrespondenten-Sync fehlgeschlagen: ${err instanceof Error ? err.message : err}`);
         }
@@ -237,7 +237,7 @@ export class AgrarmonitorPollingService implements OnModuleInit {
             let correspondentId: number | undefined;
             const customer = customers.find((c) => Number(c.id) === amDoc.kundenId);
             if (customer) {
-              const corr = await this.getOrCreateCorrespondent(customer);
+              const corr = await this.getOrCreateCorrespondent(customer, amDoc.kundenId);
               if (corr) correspondentId = corr.id as number;
             }
 
@@ -409,7 +409,7 @@ export class AgrarmonitorPollingService implements OnModuleInit {
           }
 
           // Korrespondent ermitteln oder anlegen
-          const corr = await this.getOrCreateCorrespondent(customer);
+          const corr = await this.getOrCreateCorrespondent(customer, amDoc.kundenId);
 
           // Owner aus Client-Tabelle
           let ownerId: number | undefined;
@@ -620,7 +620,16 @@ export class AgrarmonitorPollingService implements OnModuleInit {
     return { mergedDocuments };
   }
 
-  private async getOrCreateCorrespondent(customer: Record<string, unknown>): Promise<any> {
+  private async getOrCreateCorrespondent(customer: Record<string, unknown>, kundenId?: number): Promise<any> {
+    // Direkter Lookup über gespeicherte Agrarmonitor-ID
+    if (kundenId !== undefined) {
+      const setting = await this.corrSettingRepo.findOneBy({ AgrarmonitorId: kundenId });
+      if (setting) {
+        return { id: setting.CorrespondentId };
+      }
+    }
+
+    // Fallback: Namensuche und ggf. anlegen
     const lieferantennummer = (customer['lieferantennummer'] as string) ?? '';
     const displayName = this.buildCustomerName(customer, lieferantennummer);
     let corr = await this.paperlessService.getCorrespondentByName(displayName);
@@ -633,6 +642,18 @@ export class AgrarmonitorPollingService implements OnModuleInit {
         owner: null,
       });
     }
+
+    // Link für künftige Läufe speichern
+    if (corr && kundenId !== undefined) {
+      let setting = await this.corrSettingRepo.findOneBy({ CorrespondentId: corr.id as number });
+      if (!setting) {
+        setting = this.corrSettingRepo.create({ CorrespondentId: corr.id as number, AgrarmonitorId: kundenId });
+      } else {
+        setting.AgrarmonitorId = kundenId;
+      }
+      await this.corrSettingRepo.save(setting);
+    }
+
     return corr;
   }