feat: extend farmer data model with complete address fields and customer number

Backend:
- Add customerNumber, companyName, contactPerson, street, houseNumber,
  postalCode, city, phoneNumber to Farmer domain model
- Update FarmerRow and FarmerMutation records with new fields
- Update repositories, services and controllers for new farmer structure
- Fix CORS configuration to allow credentials
- Remove unused authorizationService and imports
- Update data migration for new farmer schema

Frontend:
- Update FarmerRow and FarmerOption interfaces
- Extend AdministrationPage with new farmer form fields
- Update SampleRegistrationPage and SearchFarmerPage for new structure

backend/src/main/java/de/svencarstensen/muh/config/CorsConfig.java

@@ -18,7 +18,8 @@ public class CorsConfig {
         configuration.setAllowedOrigins(allowedOrigins);
         configuration.setAllowedHeaders(List.of("*"));
         configuration.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"));
-        configuration.setAllowCredentials(false);
+        configuration.setAllowCredentials(true);
+        configuration.setExposedHeaders(List.of("Authorization"));
 
         UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
         source.registerCorsConfiguration("/api/**", configuration);

backend/src/main/java/de/svencarstensen/muh/domain/Farmer.java

@@ -10,8 +10,15 @@ public record Farmer(
         @Id String id,
         String accountId,
         String businessKey,
-        String name,
+        String customerNumber,
+        String companyName,
+        String contactPerson,
+        String street,
+        String houseNumber,
+        String postalCode,
+        String city,
         String email,
+        String phoneNumber,
         boolean active,
         String supersedesId,
         LocalDateTime createdAt,

backend/src/main/java/de/svencarstensen/muh/repository/FarmerRepository.java

@@ -6,11 +6,11 @@ import org.springframework.data.mongodb.repository.MongoRepository;
 import java.util.List;
 
 public interface FarmerRepository extends MongoRepository<Farmer, String> {
-    List<Farmer> findByActiveTrueOrderByNameAsc();
+    List<Farmer> findByActiveTrueOrderByCompanyNameAsc();
 
-    List<Farmer> findByAccountIdOrderByNameAsc(String accountId);
+    List<Farmer> findByAccountIdOrderByCompanyNameAsc(String accountId);
 
-    List<Farmer> findByAccountIdAndActiveTrueOrderByNameAsc(String accountId);
+    List<Farmer> findByAccountIdAndActiveTrueOrderByCompanyNameAsc(String accountId);
 
-    List<Farmer> findByNameContainingIgnoreCaseOrderByNameAsc(String name);
+    List<Farmer> findByCompanyNameContainingIgnoreCaseOrderByCompanyNameAsc(String companyName);
 }

backend/src/main/java/de/svencarstensen/muh/service/CatalogService.java

@@ -14,7 +14,6 @@ import de.svencarstensen.muh.repository.FarmerRepository;
 import de.svencarstensen.muh.repository.MedicationCatalogRepository;
 import de.svencarstensen.muh.repository.PathogenCatalogRepository;
 import de.svencarstensen.muh.security.AuthTokenService;
-import de.svencarstensen.muh.security.AuthorizationService;
 import org.springframework.http.HttpStatus;
 import org.springframework.lang.NonNull;
 import org.springframework.data.mongodb.core.MongoTemplate;
@@ -42,7 +41,7 @@ public class CatalogService {
 
     private static final Comparator<FarmerRow> FARMER_ROW_COMPARATOR = Comparator
             .comparing(FarmerRow::active).reversed()
-            .thenComparing(FarmerRow::name, String.CASE_INSENSITIVE_ORDER)
+            .thenComparing(FarmerRow::companyName, String.CASE_INSENSITIVE_ORDER)
             .thenComparing(FarmerRow::updatedAt, Comparator.nullsLast(Comparator.reverseOrder()));
 
     private static final Comparator<MedicationRow> MEDICATION_ROW_COMPARATOR = Comparator
@@ -67,7 +66,6 @@ public class CatalogService {
     private final AppUserRepository appUserRepository;
     private final MongoTemplate mongoTemplate;
     private final AuthTokenService authTokenService;
-    private final AuthorizationService authorizationService;
     private final BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
 
     public CatalogService(
@@ -77,8 +75,7 @@ public class CatalogService {
             AntibioticCatalogRepository antibioticRepository,
             AppUserRepository appUserRepository,
             MongoTemplate mongoTemplate,
-            AuthTokenService authTokenService,
+            AuthTokenService authTokenService
-            AuthorizationService authorizationService
     ) {
         this.farmerRepository = farmerRepository;
         this.medicationRepository = medicationRepository;
@@ -87,7 +84,6 @@ public class CatalogService {
         this.appUserRepository = appUserRepository;
         this.mongoTemplate = mongoTemplate;
         this.authTokenService = authTokenService;
-        this.authorizationService = authorizationService;
     }
 
     public ActiveCatalogSummary activeCatalogSummary(String actorId) {
@@ -113,7 +109,7 @@ public class CatalogService {
 
     // Hilfsmethoden für Datenzugriff (immer nur eigene Daten des Hauptbenutzers)
     private List<Farmer> listActiveFarmersForActor(AppUser actor) {
-        return farmerRepository.findByAccountIdAndActiveTrueOrderByNameAsc(resolveAccountId(actor));
+        return farmerRepository.findByAccountIdAndActiveTrueOrderByCompanyNameAsc(resolveAccountId(actor));
     }
 
     private List<MedicationCatalogItem> listActiveMedicationsForActor(AppUser actor) {
@@ -129,7 +125,7 @@ public class CatalogService {
     }
 
     private List<FarmerRow> listFarmerRowsForActor(AppUser actor) {
-        return farmerRepository.findByAccountIdOrderByNameAsc(resolveAccountId(actor)).stream()
+        return farmerRepository.findByAccountIdOrderByCompanyNameAsc(resolveAccountId(actor)).stream()
                 .map(this::toFarmerRow)
                 .sorted(FARMER_ROW_COMPARATOR)
                 .toList();
@@ -160,7 +156,7 @@ public class CatalogService {
         AppUser actor = requireActiveActor(actorId, "Nicht berechtigt");
         String accountId = resolveAccountId(actor);
         for (FarmerMutation mutation : mutations) {
-            if (isBlank(mutation.name())) {
+            if (isBlank(mutation.companyName())) {
                 continue;
             }
             LocalDateTime now = LocalDateTime.now();
@@ -169,8 +165,15 @@ public class CatalogService {
                         null,
                         accountId,
                         UUID.randomUUID().toString(),
-                        mutation.name().trim(),
+                        blankToNull(mutation.customerNumber()),
+                        mutation.companyName().trim(),
+                        blankToNull(mutation.contactPerson()),
+                        blankToNull(mutation.street()),
+                        blankToNull(mutation.houseNumber()),
+                        blankToNull(mutation.postalCode()),
+                        blankToNull(mutation.city()),
                         blankToNull(mutation.email()),
+                        blankToNull(mutation.phoneNumber()),
                         mutation.active(),
                         null,
                         now,
@@ -185,15 +188,29 @@ public class CatalogService {
             if (!accountId.equals(existing.accountId())) {
                 throw new ResponseStatusException(HttpStatus.FORBIDDEN, "Nicht berechtigt");
             }
-            boolean changed = !existing.name().equals(mutation.name().trim())
+            boolean changed = !existing.companyName().equals(mutation.companyName().trim())
-                    || !safeEquals(existing.email(), blankToNull(mutation.email()));
+                    || !safeEquals(existing.customerNumber(), blankToNull(mutation.customerNumber()))
+                    || !safeEquals(existing.contactPerson(), blankToNull(mutation.contactPerson()))
+                    || !safeEquals(existing.street(), blankToNull(mutation.street()))
+                    || !safeEquals(existing.houseNumber(), blankToNull(mutation.houseNumber()))
+                    || !safeEquals(existing.postalCode(), blankToNull(mutation.postalCode()))
+                    || !safeEquals(existing.city(), blankToNull(mutation.city()))
+                    || !safeEquals(existing.email(), blankToNull(mutation.email()))
+                    || !safeEquals(existing.phoneNumber(), blankToNull(mutation.phoneNumber()));
             if (changed) {
                 farmerRepository.save(new Farmer(
                         existing.id(),
                         existing.accountId(),
                         existing.businessKey(),
-                        existing.name(),
+                        existing.customerNumber(),
+                        existing.companyName(),
+                        existing.contactPerson(),
+                        existing.street(),
+                        existing.houseNumber(),
+                        existing.postalCode(),
+                        existing.city(),
                         existing.email(),
+                        existing.phoneNumber(),
                         false,
                         existing.supersedesId(),
                         existing.createdAt(),
@@ -203,8 +220,15 @@ public class CatalogService {
                         null,
                         existing.accountId(),
                         existing.businessKey(),
-                        mutation.name().trim(),
+                        blankToNull(mutation.customerNumber()),
+                        mutation.companyName().trim(),
+                        blankToNull(mutation.contactPerson()),
+                        blankToNull(mutation.street()),
+                        blankToNull(mutation.houseNumber()),
+                        blankToNull(mutation.postalCode()),
+                        blankToNull(mutation.city()),
                         blankToNull(mutation.email()),
+                        blankToNull(mutation.phoneNumber()),
                         mutation.active(),
                         existing.id(),
                         now,
@@ -217,8 +241,15 @@ public class CatalogService {
                         existing.id(),
                         existing.accountId(),
                         existing.businessKey(),
-                        existing.name(),
+                        existing.customerNumber(),
+                        existing.companyName(),
+                        existing.contactPerson(),
+                        existing.street(),
+                        existing.houseNumber(),
+                        existing.postalCode(),
+                        existing.city(),
                         existing.email(),
+                        existing.phoneNumber(),
                         mutation.active(),
                         existing.supersedesId(),
                         existing.createdAt(),
@@ -746,8 +777,15 @@ public class CatalogService {
         return new FarmerRow(
                 farmer.id(),
                 farmer.businessKey(),
-                farmer.name(),
+                farmer.customerNumber(),
+                farmer.companyName(),
+                farmer.contactPerson(),
+                farmer.street(),
+                farmer.houseNumber(),
+                farmer.postalCode(),
+                farmer.city(),
                 farmer.email(),
+                farmer.phoneNumber(),
                 farmer.active(),
                 farmer.updatedAt()
         );
@@ -812,7 +850,7 @@ public class CatalogService {
     }
 
     private FarmerOption toFarmerOption(Farmer farmer) {
-        return new FarmerOption(farmer.businessKey(), farmer.name(), farmer.email());
+        return new FarmerOption(farmer.businessKey(), farmer.companyName(), farmer.contactPerson(), farmer.email());
     }
 
     private MedicationOption toMedicationOption(MedicationCatalogItem item) {
@@ -1077,20 +1115,31 @@ public class CatalogService {
 
         LocalDateTime now = LocalDateTime.now();
 
-        // Migriere Farmers ohne accountId
+        // Migriere Farmers ohne accountId oder mit altem Schema
         farmerRepository.findAll().stream()
-                .filter(farmer -> isBlank(farmer.accountId()))
+                .filter(farmer -> isBlank(farmer.accountId()) || isBlank(farmer.companyName()))
-                .forEach(farmer -> farmerRepository.save(new Farmer(
+                .forEach(farmer -> {
+                    // Wenn companyName fehlt, nutze businessKey als Fallback
+                    String companyName = isBlank(farmer.companyName()) ? farmer.businessKey() : farmer.companyName();
+                    farmerRepository.save(new Farmer(
                             farmer.id(),
-                        defaultAccountId,
+                            isBlank(farmer.accountId()) ? defaultAccountId : farmer.accountId(),
                             farmer.businessKey(),
-                        farmer.name(),
+                            null, // customerNumber
+                            companyName,
+                            null, // contactPerson
+                            null, // street
+                            null, // houseNumber
+                            null, // postalCode
+                            null, // city
                             farmer.email(),
+                            null, // phoneNumber
                             farmer.active(),
                             farmer.supersedesId(),
                             farmer.createdAt(),
                             now
-                )));
+                    ));
+                });
 
         // Migriere Medications ohne accountId
         medicationRepository.findAll().stream()
@@ -1213,7 +1262,7 @@ public class CatalogService {
     ) {
     }
 
-    public record FarmerOption(String businessKey, String name, String email) {
+    public record FarmerOption(String businessKey, String companyName, String contactPerson, String email) {
     }
 
     public record MedicationOption(String businessKey, String name, MedicationCategory category) {
@@ -1249,14 +1298,33 @@ public class CatalogService {
     public record FarmerRow(
             String id,
             String businessKey,
-            String name,
+            String customerNumber,
+            String companyName,
+            String contactPerson,
+            String street,
+            String houseNumber,
+            String postalCode,
+            String city,
             String email,
+            String phoneNumber,
             boolean active,
             LocalDateTime updatedAt
     ) {
     }
 
-    public record FarmerMutation(String id, String name, String email, boolean active) {
+    public record FarmerMutation(
+            String id,
+            String customerNumber,
+            String companyName,
+            String contactPerson,
+            String street,
+            String houseNumber,
+            String postalCode,
+            String city,
+            String email,
+            String phoneNumber,
+            boolean active
+    ) {
     }
 
     public record MedicationRow(

backend/src/main/java/de/svencarstensen/muh/service/InvoiceService.java

@@ -14,10 +14,8 @@ import org.springframework.stereotype.Service;
 import org.springframework.web.server.ResponseStatusException;
 
 import java.time.LocalDate;
-import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
-import java.util.Locale;
 import java.util.Optional;
 
 @Service

backend/src/main/java/de/svencarstensen/muh/service/PortalService.java

@@ -31,7 +31,7 @@ public class PortalService {
             LocalDate date
     ) {
         List<CatalogService.FarmerOption> matchingFarmers = catalogService.activeCatalogSummary(actorId).farmers().stream()
-                .filter(farmer -> farmerQuery == null || farmerQuery.isBlank() || farmer.name().toLowerCase(Locale.ROOT).contains(farmerQuery.toLowerCase(Locale.ROOT)))
+                .filter(farmer -> farmerQuery == null || farmerQuery.isBlank() || farmer.companyName().toLowerCase(Locale.ROOT).contains(farmerQuery.toLowerCase(Locale.ROOT)))
                 .toList();
 
         List<PortalSampleRow> sampleRows;

backend/src/main/java/de/svencarstensen/muh/service/SampleService.java

@@ -124,7 +124,7 @@ public class SampleService {
                 null,
                 sampleNumber,
                 farmer.businessKey(),
-                farmer.name(),
+                farmer.companyName(),
                 farmer.email(),
                 request.cowNumber().trim(),
                 blankToNull(request.cowName()),
@@ -178,7 +178,7 @@ public class SampleService {
                 existing.id(),
                 existing.sampleNumber(),
                 farmer.businessKey(),
-                farmer.name(),
+                farmer.companyName(),
                 farmer.email(),
                 request.cowNumber().trim(),
                 blankToNull(request.cowName()),

frontend/src/lib/types.ts

@@ -27,7 +27,8 @@ export type UserRole = "ADMIN" | "CUSTOMER";
 
 export interface FarmerOption {
   businessKey: string;
-  name: string;
+  companyName: string;
+  contactPerson: string | null;
   email: string | null;
 }
 
@@ -204,8 +205,15 @@ export interface SampleDetail {
 export interface FarmerRow {
   id: string;
   businessKey: string;
-  name: string;
+  customerNumber: string | null;
+  companyName: string;
+  contactPerson: string | null;
+  street: string | null;
+  houseNumber: string | null;
+  postalCode: string | null;
+  city: string | null;
   email: string | null;
+  phoneNumber: string | null;
   active: boolean;
   updatedAt: string;
 }

frontend/src/pages/AdministrationPage.tsx

@@ -8,13 +8,23 @@ type DatasetKey = "farmers" | "medications" | "pathogens" | "antibiotics";
 type EditableRow = {
   id: string;
   businessKey: string;
-  name: string;
+  // Farmer fields
-  active: boolean;
+  customerNumber?: string;
-  updatedAt: string;
+  companyName?: string;
+  contactPerson?: string;
+  street?: string;
+  houseNumber?: string;
+  postalCode?: string;
+  city?: string;
   email?: string;
+  phoneNumber?: string;
+  // Other fields
+  name?: string;
   category?: MedicationCategory;
   code?: string;
   kind?: PathogenKind;
+  active: boolean;
+  updatedAt: string;
 };
 
 type DatasetsState = Record<DatasetKey, EditableRow[]>;
@@ -33,13 +43,51 @@ const DATASET_TITLES: Record<DatasetKey, string> = {
   antibiotics: "Die Verwaltung der Antibiogramme",
 };
 
+const FARMER_REQUIRED_FIELDS: Array<keyof EditableRow> = [
+  "companyName",
+  "customerNumber",
+  "contactPerson",
+  "street",
+  "houseNumber",
+  "postalCode",
+  "city",
+  "email",
+  "phoneNumber",
+];
+
+function isBlankValue(value: string | undefined) {
+  return !value?.trim();
+}
+
+function isFarmerFieldInvalid(row: EditableRow, field: keyof EditableRow, showValidation: boolean) {
+  if (!showValidation) {
+    return false;
+  }
+  const value = row[field];
+  return typeof value !== "string" || isBlankValue(value);
+}
+
+function isFarmerRowIncomplete(row: EditableRow) {
+  return FARMER_REQUIRED_FIELDS.some((field) => {
+    const value = row[field];
+    return typeof value !== "string" || isBlankValue(value);
+  });
+}
+
 function normalizeOverview(overview: AdministrationOverview): DatasetsState {
   return {
     farmers: overview.farmers.map((entry) => ({
       id: entry.id,
       businessKey: entry.businessKey,
-      name: entry.name,
+      customerNumber: entry.customerNumber ?? "",
+      companyName: entry.companyName,
+      contactPerson: entry.contactPerson ?? "",
+      street: entry.street ?? "",
+      houseNumber: entry.houseNumber ?? "",
+      postalCode: entry.postalCode ?? "",
+      city: entry.city ?? "",
       email: entry.email ?? "",
+      phoneNumber: entry.phoneNumber ?? "",
       active: entry.active,
       updatedAt: entry.updatedAt,
     })),
@@ -74,7 +122,21 @@ function normalizeOverview(overview: AdministrationOverview): DatasetsState {
 function emptyRow(dataset: DatasetKey): EditableRow {
   switch (dataset) {
     case "farmers":
-      return { id: "", businessKey: "", name: "", email: "", active: true, updatedAt: new Date().toISOString() };
+      return { 
+        id: "", 
+        businessKey: "", 
+        customerNumber: "",
+        companyName: "",
+        contactPerson: "",
+        street: "",
+        houseNumber: "",
+        postalCode: "",
+        city: "",
+        email: "",
+        phoneNumber: "",
+        active: true, 
+        updatedAt: new Date().toISOString() 
+      };
     case "medications":
       return {
         id: "",
@@ -133,6 +195,7 @@ export default function AdministrationPage() {
   }, []);
 
   const rows = useMemo(() => datasets?.[selectedDataset] ?? [], [datasets, selectedDataset]);
+  const isFarmerDataset = selectedDataset === "farmers";
 
   function updateRow(index: number, patch: Partial<EditableRow>) {
     setDatasets((current) => {
@@ -166,7 +229,11 @@ export default function AdministrationPage() {
       return;
     }
     setShowValidation(true);
-    if (rows.some((row) => !row.name.trim())) {
+    if (selectedDataset === "farmers" && rows.some(isFarmerRowIncomplete)) {
+      setMessage("Bitte alle Pflichtfelder fuer den Landwirt ausfuellen.");
+      return;
+    }
+    if (selectedDataset !== "farmers" && rows.some((row) => !row.name?.trim())) {
       setMessage("Bitte alle Pflichtfelder ausfuellen.");
       return;
     }
@@ -178,8 +245,15 @@ export default function AdministrationPage() {
         case "farmers":
           response = await apiPost<EditableRow[]>("/catalog/farmers", rows.map((row) => ({
             id: row.id || null,
-            name: row.name,
+            customerNumber: row.customerNumber || null,
+            companyName: row.companyName,
+            contactPerson: row.contactPerson || null,
+            street: row.street || null,
+            houseNumber: row.houseNumber || null,
+            postalCode: row.postalCode || null,
+            city: row.city || null,
             email: row.email || null,
+            phoneNumber: row.phoneNumber || null,
             active: row.active,
           })));
           break;
@@ -245,12 +319,130 @@ export default function AdministrationPage() {
           </div>
         </div>
 
+        {isFarmerDataset ? (
+          <div className="admin-farmer-list">
+            {rows.map((row, index) => (
+              <article key={`${row.id || "new"}-${index}`} className="admin-farmer-card">
+                <div className="admin-farmer-card__row admin-farmer-card__row--primary">
+                  <label className="field field--required">
+                    <span>Firmenname</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "companyName", showValidation) ? "is-invalid" : ""}
+                      value={row.companyName ?? ""}
+                      onChange={(event) => updateRow(index, { companyName: event.target.value })}
+                      placeholder="Firmenname"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Ansprechpartner</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "contactPerson", showValidation) ? "is-invalid" : ""}
+                      value={row.contactPerson ?? ""}
+                      onChange={(event) => updateRow(index, { contactPerson: event.target.value })}
+                      placeholder="Ansprechpartner"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Kunden-Nr.</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "customerNumber", showValidation) ? "is-invalid" : ""}
+                      value={row.customerNumber ?? ""}
+                      onChange={(event) => updateRow(index, { customerNumber: event.target.value })}
+                      placeholder="Kunden-Nr."
+                      required
+                    />
+                  </label>
+                </div>
+
+                <div className="admin-farmer-card__row admin-farmer-card__row--address">
+                  <label className="field field--required">
+                    <span>PLZ</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "postalCode", showValidation) ? "is-invalid" : ""}
+                      value={row.postalCode ?? ""}
+                      onChange={(event) => updateRow(index, { postalCode: event.target.value })}
+                      placeholder="PLZ"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Ort</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "city", showValidation) ? "is-invalid" : ""}
+                      value={row.city ?? ""}
+                      onChange={(event) => updateRow(index, { city: event.target.value })}
+                      placeholder="Ort"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Straße</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "street", showValidation) ? "is-invalid" : ""}
+                      value={row.street ?? ""}
+                      onChange={(event) => updateRow(index, { street: event.target.value })}
+                      placeholder="Straße"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Hausnummer</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "houseNumber", showValidation) ? "is-invalid" : ""}
+                      value={row.houseNumber ?? ""}
+                      onChange={(event) => updateRow(index, { houseNumber: event.target.value })}
+                      placeholder="Hausnummer"
+                      required
+                    />
+                  </label>
+                </div>
+
+                <div className="admin-farmer-card__row admin-farmer-card__row--contact">
+                  <label className="field field--required">
+                    <span>E-Mail</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "email", showValidation) ? "is-invalid" : ""}
+                      value={row.email ?? ""}
+                      onChange={(event) => updateRow(index, { email: event.target.value })}
+                      placeholder="E-Mail"
+                      required
+                    />
+                  </label>
+                  <label className="field field--required">
+                    <span>Telefon</span>
+                    <input
+                      className={isFarmerFieldInvalid(row, "phoneNumber", showValidation) ? "is-invalid" : ""}
+                      value={row.phoneNumber ?? ""}
+                      onChange={(event) => updateRow(index, { phoneNumber: event.target.value })}
+                      placeholder="Telefon"
+                      required
+                    />
+                  </label>
+                </div>
+
+                <div className="admin-farmer-card__row admin-farmer-card__row--toggle">
+                  <label className="field">
+                    <span>Aktiv</span>
+                    <button
+                      type="button"
+                      className={`eye-button admin-farmer-card__toggle ${row.active ? "is-active" : "is-inactive"}`}
+                      onClick={() => updateRow(index, { active: !row.active })}
+                    >
+                      {row.active ? "sichtbar" : "inaktiv"}
+                    </button>
+                  </label>
+                </div>
+              </article>
+            ))}
+          </div>
+        ) : (
           <div className="table-shell">
             <table className="data-table">
               <thead>
                 <tr>
                   <th className="required-label">Name</th>
-                {selectedDataset === "farmers" ? <th>E-Mail</th> : null}
                   {selectedDataset === "medications" ? <th>Kategorie</th> : null}
                   {selectedDataset === "pathogens" || selectedDataset === "antibiotics" ? <th>Kuerzel</th> : null}
                   {selectedDataset === "pathogens" ? <th>Typ</th> : null}
@@ -262,19 +454,11 @@ export default function AdministrationPage() {
                   <tr key={`${row.id || "new"}-${index}`}>
                     <td>
                       <input
-                      className={showValidation && !row.name.trim() ? "is-invalid" : ""}
+                        className={showValidation && !row.name?.trim() ? "is-invalid" : ""}
-                      value={row.name}
+                        value={row.name ?? ""}
                         onChange={(event) => updateRow(index, { name: event.target.value })}
                       />
                     </td>
-                  {selectedDataset === "farmers" ? (
-                    <td>
-                      <input
-                        value={row.email ?? ""}
-                        onChange={(event) => updateRow(index, { email: event.target.value })}
-                      />
-                    </td>
-                  ) : null}
                     {selectedDataset === "medications" ? (
                       <td>
                         <select
@@ -326,6 +510,7 @@ export default function AdministrationPage() {
               </tbody>
             </table>
           </div>
+        )}
 
         <div className="page-actions page-actions--space-between">
           <button type="button" className="secondary-button" onClick={addRow}>

frontend/src/pages/SampleRegistrationPage.tsx

@@ -196,7 +196,7 @@ export default function SampleRegistrationPage() {
               >
                 {catalogs?.farmers.map((farmer) => (
                   <option key={farmer.businessKey} value={farmer.businessKey}>
-                    {farmer.name}
+                    {farmer.companyName}
                   </option>
                 ))}
               </select>

frontend/src/pages/SearchFarmerPage.tsx

@@ -22,7 +22,7 @@ export default function SearchFarmerPage() {
       `/portal/snapshot?farmerBusinessKey=${encodeURIComponent(farmer.businessKey)}`,
     );
     setSamples(response.samples);
-    setResultLabel(`Proben von ${farmer.name}`);
+    setResultLabel(`Proben von ${farmer.companyName}`);
     setMessage(response.samples.length ? null : "Zu diesem Landwirt wurden noch keine Proben gefunden.");
   }
 
@@ -121,7 +121,7 @@ export default function SearchFarmerPage() {
                 className="user-card"
                 onClick={() => void loadFarmerSamples(farmer)}
               >
-                <strong>{farmer.name}</strong>
+                <strong>{farmer.companyName}</strong>
                 <small>{farmer.email ?? "ohne E-Mail"}</small>
               </button>
             ))}

frontend/src/styles/global.css

@@ -570,6 +570,46 @@ a {
   overflow: auto;
 }
 
+.admin-farmer-list {
+  display: grid;
+  gap: 20px;
+}
+
+.admin-farmer-card {
+  display: grid;
+  gap: 16px;
+  padding: 24px;
+  border: 1px solid rgba(37, 49, 58, 0.08);
+  border-radius: 24px;
+  background: rgba(255, 255, 255, 0.42);
+}
+
+.admin-farmer-card__row {
+  display: grid;
+  gap: 16px;
+}
+
+.admin-farmer-card__row--primary {
+  grid-template-columns: minmax(0, 1.8fr) minmax(0, 1.3fr) minmax(0, 1fr);
+}
+
+.admin-farmer-card__row--address {
+  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.05fr) minmax(0, 1.8fr) minmax(0, 0.9fr);
+}
+
+.admin-farmer-card__row--contact {
+  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.1fr);
+}
+
+.admin-farmer-card__row--toggle {
+  grid-template-columns: minmax(0, 180px);
+}
+
+.admin-farmer-card__toggle {
+  min-width: 140px;
+  justify-content: center;
+}
+
 .data-table {
   width: 100%;
   border-collapse: collapse;
@@ -590,6 +630,35 @@ a {
   text-transform: uppercase;
 }
 
+@media (max-width: 1200px) {
+  .admin-farmer-card__row--primary,
+  .admin-farmer-card__row--address,
+  .admin-farmer-card__row--contact {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
+  .admin-farmer-card__row--toggle {
+    grid-template-columns: minmax(0, 180px);
+  }
+
+  .admin-farmer-card__toggle {
+    width: 100%;
+  }
+}
+
+@media (max-width: 720px) {
+  .admin-farmer-card {
+    padding: 18px;
+  }
+
+  .admin-farmer-card__row--primary,
+  .admin-farmer-card__row--address,
+  .admin-farmer-card__row--contact,
+  .admin-farmer-card__row--toggle {
+    grid-template-columns: 1fr;
+  }
+}
+
 .status-pill,
 .info-chip {
   display: inline-flex;