feat: Rechnungsfilter (offen/gesendet), Rabatt-Dialog, Adress-Labels mit voller Adresse und Duplikatsschutz im Adressbuch

- Rechnungen erstellen: Filter Alle/Offene/Gesendete pro Abrechnungsmonat; Versand wird in system_invoice_dispatch protokolliert
- Rabatt pro Kunde jetzt über Icon-Dialog mit Prozentwert und Grund; Grund erscheint auf der Rechnungsposition
- MessageController: stille catch-Blöcke durch Logging ersetzt, offene Pflicht-Tasks werden bei station_completed geloggt
- Auftragserstellung: Abhol- und Lieferadresslisten zeigen die komplette Adresse, Auftraggeber nur den Firmennamen; (2)-Zähler entfernt
- Adressbuch: komplett identische Einträge werden beim Anlegen übersprungen bzw. mit Hinweis abgelehnt
- App: Versionsanzeige liest zur Laufzeit aus dem Build (package_info_plus), pubspec auf 0.9.20+1; Versionspflege dokumentiert (pom.xml fürs Web, pubspec.yaml für die App)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/CLAUDE.md

@@ -13,6 +13,8 @@ flutter run -d <device>      # Run app on device
 dart run build_runner build  # Generate ObjectBox code after entity changes
 ```
 
+**Versioning:** The Flutter app version is maintained in `pubspec.yaml` (`version:`); the settings view shows it at runtime via `package_info_plus`. The web app/backend version is maintained separately in `backend/pom.xml` (`<revision>`) and surfaced through the `app.version` property.
+
 **Important:** Run `flutter analyze` after every task and fix any reported issues before committing.
 
 ## Architecture Overview

app/lib/settings_view.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:package_info_plus/package_info_plus.dart';
 import 'l10n/app_localizations.dart';
 import 'app_state.dart';
 import 'app_theme.dart';
@@ -26,11 +27,23 @@ class SettingsView extends StatefulWidget {
 class _SettingsViewState extends State<SettingsView> {
   late String _selectedLanguageCode;
   final AppState _appState = AppState();
+  String _appVersion = '';
 
   @override
   void initState() {
     super.initState();
     _selectedLanguageCode = _appState.languageCode;
+    _loadAppVersion();
+  }
+
+  Future<void> _loadAppVersion() async {
+    final info = await PackageInfo.fromPlatform();
+    if (!mounted) {
+      return;
+    }
+    setState(() {
+      _appVersion = info.version;
+    });
   }
 
   void _onLanguageSelected(String languageCode) async {
@@ -213,7 +226,7 @@ class _SettingsViewState extends State<SettingsView> {
           ListTile(
             leading: Icon(Icons.info_outline, color: AppColors.textMuted),
             title: Text(l10n.version),
-            subtitle: const Text('0.9.2'),
+            subtitle: Text(_appVersion),
           ),
           const Divider(height: 1, indent: 72),
         ],

app/pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.9.16+1
+version: 0.9.20+1
 
 environment:
   sdk: ^3.7.0

backend/src/main/java/de/assecutor/votianlt/controller/MessageController.java

@@ -383,7 +383,8 @@ public class MessageController {
                 jobHistoryService.logTaskCompletion(jobId, taskType, taskIdStr, completedBy, taskDisplayName,
                         extraDataSummary);
             } catch (Exception e) {
-                // Ignore history logging errors
+                log.error("[TASK] Could not write job history for task {} of job {}: {}", taskIdStr, jobId,
+                        e.getMessage(), e);
             }
 
             // Send email notification for task completion
@@ -395,7 +396,8 @@ public class MessageController {
                 // It is now driven by explicit station_completed messages from the app
                 // (see handleStationCompleted).
             } catch (Exception e) {
-                // Ignore email notification errors
+                log.error("[TASK] Could not send completion notification for task {} of job {}: {}", taskIdStr, jobId,
+                        e.getMessage(), e);
             }
 
             jobUpdateBroadcaster.broadcast(jobId);
@@ -422,11 +424,17 @@ public class MessageController {
                 try {
                     emailService.sendJobCompletionNotification(jobId, completedBy);
                 } catch (Exception e) {
-                    // Ignore email notification errors
+                    log.error("[JOB] Could not send job completion notification for job {}: {}", jobId, e.getMessage(),
+                            e);
                 }
+            } else {
+                List<String> openTaskIds = mandatoryTasks.stream().filter(task -> !task.isCompleted())
+                        .map(task -> task.getIdAsString()).toList();
+                log.info("[JOB] Job {} not completed yet, {} of {} mandatory tasks still open: {}", jobId,
+                        openTaskIds.size(), mandatoryTasks.size(), openTaskIds);
             }
         } catch (Exception e) {
-            // Ignore job completion check errors
+            log.error("[JOB] Completion check failed for job {}: {}", jobId, e.getMessage(), e);
         }
     }
 
@@ -434,6 +442,7 @@ public class MessageController {
         try {
             Optional<Job> jobOpt = jobRepository.findById(jobId);
             if (jobOpt.isEmpty()) {
+                log.warn("[JOB] Cannot mark job {} as completed: job not found", jobId);
                 return;
             }
 
@@ -442,9 +451,10 @@ public class MessageController {
                 job.setStatus(JobStatus.COMPLETED);
                 job.setUpdatedAt(LocalDateTime.now());
                 jobRepository.save(job);
+                log.info("[JOB] Job {} marked as COMPLETED", jobId);
             }
         } catch (Exception e) {
-            // Ignore job status update errors
+            log.error("[JOB] Could not update status of job {} to COMPLETED: {}", jobId, e.getMessage(), e);
         }
     }
 
@@ -511,7 +521,8 @@ public class MessageController {
             ChatMessageInboundPayload inboundPayload = ChatMessageInboundPayload.fromPayload(payload);
             messageService.receiveMessageFromClient(inboundPayload);
         } catch (Exception e) {
-            // Ignore message handling errors
+            log.error("[MESSAGE] Could not process incoming message from app user {}: {}", appUserId, e.getMessage(),
+                    e);
         }
     }
 

backend/src/main/java/de/assecutor/votianlt/model/invoices/SystemInvoiceDispatch.java

@@ -0,0 +1,42 @@
+package de.assecutor.votianlt.model.invoices;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.bson.types.ObjectId;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.index.Indexed;
+import org.springframework.data.mongodb.core.mapping.Document;
+import org.springframework.data.mongodb.core.mapping.Field;
+
+import java.time.LocalDateTime;
+
+/**
+ * Records that a system invoice has been sent to a customer by email. Used to
+ * filter the monthly invoice list into open and already sent invoices.
+ */
+@Data
+@NoArgsConstructor
+@Document(collection = "system_invoice_dispatch")
+public class SystemInvoiceDispatch {
+
+    @Id
+    private ObjectId id;
+
+    /** Invoice number, e.g. SYS-202607-42; one dispatch record per invoice. */
+    @Indexed(unique = true)
+    @Field("invoice_number")
+    private String invoiceNumber;
+
+    @Field("user_id")
+    private ObjectId userId;
+
+    /** Billing month in ISO format, e.g. 2026-07. */
+    @Field("billing_month")
+    private String billingMonth;
+
+    @Field("sent_at")
+    private LocalDateTime sentAt;
+
+    @Field("sent_to")
+    private String sentTo;
+}

backend/src/main/java/de/assecutor/votianlt/pages/base/ui/component/CustomerAddressLabelHelper.java

@@ -8,28 +8,49 @@ public final class CustomerAddressLabelHelper {
     private CustomerAddressLabelHelper() {
     }
 
-    public static void putUnique(Map<String, Customer> target, Customer customer, String fallbackLabel) {
+    /** Adds the customer under its full address label ("Name, Street No, Zip City"). */
-        String label = build(customer, fallbackLabel);
+    public static void put(Map<String, Customer> target, Customer customer, String fallbackLabel) {
-        String uniqueLabel = label;
+        target.put(build(customer, fallbackLabel), customer);
-        int counter = 2;
-        while (target.containsKey(uniqueLabel)) {
-            uniqueLabel = label + " (" + counter++ + ")";
-        }
-        target.put(uniqueLabel, customer);
     }
 
+    /** Adds the customer under its plain name label (company or person name). */
+    public static void putName(Map<String, Customer> target, Customer customer, String fallbackLabel) {
+        target.put(buildName(customer, fallbackLabel), customer);
+    }
+
+    /**
+     * Builds the selection label as full address ("Name, Street No, Zip City")
+     * so that entries with the same name (e.g. branches of one company) remain
+     * distinguishable in the combo boxes.
+     */
     public static String build(Customer customer, String fallbackLabel) {
         if (customer == null) {
             return fallbackLabel;
         }
 
-        String companyName = trimToNull(customer.getCompanyName());
+        StringBuilder label = new StringBuilder(buildName(customer, fallbackLabel));
-        if (companyName != null) {
+        String street = trimToNull(join(" ", customer.getStreet(), customer.getHouseNumber()));
-            return companyName;
+        if (street != null) {
+            label.append(", ").append(street);
+        }
+        String city = trimToNull(join(" ", customer.getZip(), customer.getCity()));
+        if (city != null) {
+            label.append(", ").append(city);
+        }
+        return label.toString();
+    }
+
+    /** Plain name label: company name, otherwise person name, otherwise fallback. */
+    public static String buildName(Customer customer, String fallbackLabel) {
+        if (customer == null) {
+            return fallbackLabel;
         }
 
-        String fullName = trimToNull(join(" ", customer.getFirstname(), customer.getLastName()));
+        String name = trimToNull(customer.getCompanyName());
-        return fullName != null ? fullName : fallbackLabel;
+        if (name == null) {
+            name = trimToNull(join(" ", customer.getFirstname(), customer.getLastName()));
+        }
+        return name != null ? name : fallbackLabel;
     }
 
     public static String resolveCompanyValue(Map<String, Customer> addressOptions, String comboValue) {

backend/src/main/java/de/assecutor/votianlt/pages/base/ui/component/DeliveryStationDialog.java

@@ -687,7 +687,7 @@ public class DeliveryStationDialog extends Dialog {
     private void setupCompanyAutocomplete(ComboBox<String> companyField, List<Customer> customers) {
         companyAddressOptions.clear();
         for (Customer customer : customers) {
-            CustomerAddressLabelHelper.putUnique(companyAddressOptions, customer,
+            CustomerAddressLabelHelper.put(companyAddressOptions, customer,
                     translationHelper.getTranslation("addjob.customer.unnamed"));
         }
 

backend/src/main/java/de/assecutor/votianlt/pages/base/ui/component/DeliveryStationTile.java

@@ -229,7 +229,7 @@ public class DeliveryStationTile extends VerticalLayout {
             TranslationHelper translationHelper) {
         companyAddressOptions.clear();
         for (Customer customer : customers) {
-            CustomerAddressLabelHelper.putUnique(companyAddressOptions, customer,
+            CustomerAddressLabelHelper.put(companyAddressOptions, customer,
                     translationHelper.getTranslation("addjob.customer.unnamed"));
         }
 

backend/src/main/java/de/assecutor/votianlt/pages/base/ui/component/PickupStationDialog.java

@@ -310,7 +310,7 @@ public class PickupStationDialog extends Dialog {
 
         customerLabelMap.clear();
         for (Customer c : customers) {
-            CustomerAddressLabelHelper.putUnique(customerLabelMap, c,
+            CustomerAddressLabelHelper.putName(customerLabelMap, c,
                     translationHelper.getTranslation("addjob.customer.unnamed"));
         }
         customerComboBox.setItems(new ArrayList<>(customerLabelMap.keySet()));
@@ -832,7 +832,7 @@ public class PickupStationDialog extends Dialog {
     private void setupCompanyAutocomplete(ComboBox<String> companyField, List<Customer> customers) {
         companyCustomerMap.clear();
         for (Customer customer : customers) {
-            CustomerAddressLabelHelper.putUnique(companyCustomerMap, customer,
+            CustomerAddressLabelHelper.put(companyCustomerMap, customer,
                     translationHelper.getTranslation("addjob.customer.unnamed"));
         }
         companyField.setItems(new ArrayList<>(companyCustomerMap.keySet()));

backend/src/main/java/de/assecutor/votianlt/pages/domain/AddCustomerRepository.java

@@ -1,9 +1,11 @@
 package de.assecutor.votianlt.pages.domain;
 
 import de.assecutor.votianlt.model.Customer;
+import java.util.List;
 import org.bson.types.ObjectId;
 import org.springframework.data.mongodb.repository.MongoRepository;
 
 public interface AddCustomerRepository extends MongoRepository<Customer, ObjectId> {
 
+    List<Customer> findByOwnerAndInternal(ObjectId owner, boolean internal);
 }

backend/src/main/java/de/assecutor/votianlt/pages/service/AddCustomerService.java

@@ -21,18 +21,29 @@ public class AddCustomerService {
         this.sequenceGeneratorService = sequenceGeneratorService;
     }
 
-    public void addCustomer(Customer customer) {
+    /**
+     * Creates the customer unless a completely identical entry already exists
+     * for the current owner. Returns false if the duplicate was skipped.
+     */
+    public boolean addCustomer(Customer customer) {
         validateCustomer(customer);
 
         // Setze den aktuellen Benutzer als Ersteller - jetzt direkt aus der Session
         de.assecutor.votianlt.model.User currentUser = securityService.getCurrentDatabaseUser();
         customer.setCreatedBy(currentUser.getId());
         customer.setOwner(currentUser.getId());
+
+        // Keine komplett identischen Einträge anlegen
+        if (identicalCustomerExists(customer)) {
+            return false;
+        }
+
         if (customer.getUsrId() == null) {
             customer.setUsrId(sequenceGeneratorService.nextCustomerNumber());
         }
 
         addCustomerRepository.save(customer);
+        return true;
     }
 
     public void addInternalCustomer(Customer customer) {
@@ -44,6 +55,28 @@ public class AddCustomerService {
         addCustomer(customer);
     }
 
+    private boolean identicalCustomerExists(Customer customer) {
+        return addCustomerRepository.findByOwnerAndInternal(customer.getOwner(), customer.isInternal()).stream()
+                .anyMatch(existing -> isIdentical(existing, customer));
+    }
+
+    private boolean isIdentical(Customer a, Customer b) {
+        return equalsNormalized(a.getCompanyName(), b.getCompanyName()) && equalsNormalized(a.getTitle(), b.getTitle())
+                && equalsNormalized(a.getFirstname(), b.getFirstname())
+                && equalsNormalized(a.getLastName(), b.getLastName())
+                && equalsNormalized(a.getTelephone(), b.getTelephone()) && equalsNormalized(a.getMail(), b.getMail())
+                && equalsNormalized(a.getStreet(), b.getStreet())
+                && equalsNormalized(a.getHouseNumber(), b.getHouseNumber())
+                && equalsNormalized(a.getAddressAddition(), b.getAddressAddition())
+                && equalsNormalized(a.getZip(), b.getZip()) && equalsNormalized(a.getCity(), b.getCity());
+    }
+
+    private boolean equalsNormalized(String first, String second) {
+        String left = first != null ? first.trim() : "";
+        String right = second != null ? second.trim() : "";
+        return left.equalsIgnoreCase(right);
+    }
+
     public void updateCustomer(Customer customer) {
         if (customer == null || customer.getId() == null) {
             throw new IllegalArgumentException("Kunden-ID fehlt");

backend/src/main/java/de/assecutor/votianlt/pages/view/AddCustomerView.java

@@ -214,7 +214,13 @@ public class AddCustomerView extends Main implements HasDynamicTitle {
             Customer customer = new Customer();
             binder.writeBean(customer);
 
-            addCustomerService.addCustomer(customer);
+            boolean created = addCustomerService.addCustomer(customer);
+            if (!created) {
+                com.vaadin.flow.component.notification.Notification.show(
+                        getTranslation("addcustomer.notification.duplicate"), 5000,
+                        com.vaadin.flow.component.notification.Notification.Position.TOP_CENTER);
+                return;
+            }
 
             com.vaadin.flow.component.notification.Notification.show(getTranslation("addcustomer.notification.success"),
                     3000, com.vaadin.flow.component.notification.Notification.Position.TOP_CENTER);

backend/src/main/java/de/assecutor/votianlt/pages/view/AddJobView.java

@@ -243,7 +243,7 @@ public class AddJobView extends Main implements HasDynamicTitle {
         List<Customer> ownerCustomers = customerService.findAllForCurrentOwner();
         customerLabelToEntity.clear();
         for (Customer c : ownerCustomers) {
-            CustomerAddressLabelHelper.putUnique(customerLabelToEntity, c, getTranslation("addjob.customer.unnamed"));
+            CustomerAddressLabelHelper.putName(customerLabelToEntity, c, getTranslation("addjob.customer.unnamed"));
         }
         customerSelection.setItems(new ArrayList<>(customerLabelToEntity.keySet()));
 
@@ -1415,7 +1415,7 @@ public class AddJobView extends Main implements HasDynamicTitle {
 
         Map<String, Customer> addressOptions = new LinkedHashMap<>();
         for (Customer customer : allCustomers) {
-            CustomerAddressLabelHelper.putUnique(addressOptions, customer, getTranslation("addjob.customer.unnamed"));
+            CustomerAddressLabelHelper.put(addressOptions, customer, getTranslation("addjob.customer.unnamed"));
         }
 
         // Set items for autocomplete

backend/src/main/java/de/assecutor/votianlt/pages/view/AdminCreateInvoicesView.java

@@ -23,11 +23,13 @@ import com.vaadin.flow.theme.lumo.LumoUtility;
 import de.assecutor.votianlt.model.PriceTable;
 import de.assecutor.votianlt.model.User;
 import de.assecutor.votianlt.model.invoices.SystemInvoiceData;
+import de.assecutor.votianlt.model.invoices.SystemInvoiceDispatch;
 import de.assecutor.votianlt.pages.base.ui.component.DialogStylingHelper;
 import de.assecutor.votianlt.pages.base.ui.component.ViewToolbar;
 import de.assecutor.votianlt.pages.base.ui.view.AdminLayout;
 import de.assecutor.votianlt.repository.AppUserRepository;
 import de.assecutor.votianlt.repository.PriceTableRepository;
+import de.assecutor.votianlt.repository.SystemInvoiceDispatchRepository;
 import de.assecutor.votianlt.repository.UserRepository;
 import de.assecutor.votianlt.service.CustomerInvoiceService;
 import de.assecutor.votianlt.service.EmailService;
@@ -40,6 +42,7 @@ import lombok.extern.slf4j.Slf4j;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.time.YearMonth;
 import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
@@ -72,10 +75,20 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
     private final CustomerInvoiceService customerInvoiceService;
     private final SystemCompanyProfileService systemCompanyProfileService;
     private final EmailService emailService;
+    private final SystemInvoiceDispatchRepository dispatchRepository;
+
+    private final Grid<BillingInfo> grid = new Grid<>();
 
     /** Billing month, selectable by the user; defaults to the current month. */
     private YearMonth billingMonth = YearMonth.now();
 
+    /** Filter for the invoice list: all, only open or only sent invoices. */
+    private enum InvoiceFilter {
+        ALL, OPEN, SENT
+    }
+
+    private InvoiceFilter invoiceFilter = InvoiceFilter.ALL;
+
     /** Discount with reason per customer (user id), entered via the dialog. */
     private final Map<org.bson.types.ObjectId, DiscountEntry> discounts = new HashMap<>();
 
@@ -86,7 +99,7 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
     public AdminCreateInvoicesView(UserRepository userRepository, PriceTableRepository priceTableRepository,
             AppUserRepository appUserRepository, InvoiceTemplateService invoiceTemplateService,
             CustomerInvoiceService customerInvoiceService, SystemCompanyProfileService systemCompanyProfileService,
-            EmailService emailService) {
+            EmailService emailService, SystemInvoiceDispatchRepository dispatchRepository) {
         this.userRepository = userRepository;
         this.priceTableRepository = priceTableRepository;
         this.appUserRepository = appUserRepository;
@@ -94,6 +107,7 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
         this.customerInvoiceService = customerInvoiceService;
         this.systemCompanyProfileService = systemCompanyProfileService;
         this.emailService = emailService;
+        this.dispatchRepository = dispatchRepository;
 
         setSizeFull();
         addClassNames(LumoUtility.BoxSizing.BORDER, LumoUtility.Display.FLEX, LumoUtility.FlexDirection.COLUMN,
@@ -116,17 +130,33 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
                 month -> month.format(DateTimeFormatter.ofPattern("LLLL yyyy", getLocale())));
         monthSelect.setValue(billingMonth);
 
+        // Filter: all invoices of the month, only open or only sent ones
+        Select<InvoiceFilter> filterSelect = new Select<>();
+        filterSelect.setLabel(getTranslation("admincreateinvoices.filter.label"));
+        filterSelect.setItems(InvoiceFilter.values());
+        filterSelect.setItemLabelGenerator(
+                filter -> getTranslation("admincreateinvoices.filter." + filter.name().toLowerCase()));
+        filterSelect.setValue(invoiceFilter);
+        filterSelect.addValueChangeListener(event -> {
+            if (event.getValue() != null) {
+                invoiceFilter = event.getValue();
+                grid.deselectAll();
+                grid.setItems(loadBillingInfos());
+            }
+        });
+
         add(new ViewToolbar(getTranslation("admincreateinvoices.title")));
 
-        // Month selection left-aligned below the heading
+        // Month and filter selection left-aligned below the heading
-        monthSelect.getStyle().set("align-self", "flex-start");
+        com.vaadin.flow.component.orderedlayout.HorizontalLayout selectionLayout = new com.vaadin.flow.component.orderedlayout.HorizontalLayout(
-        add(monthSelect);
+                monthSelect, filterSelect);
+        selectionLayout.getStyle().set("align-self", "flex-start");
+        add(selectionLayout);
 
         Paragraph hint = new Paragraph(getTranslation("admincreateinvoices.hint"));
         hint.addClassNames(LumoUtility.TextColor.SECONDARY, LumoUtility.FontSize.SMALL, LumoUtility.Margin.NONE);
         add(hint);
 
-        Grid<BillingInfo> grid = new Grid<>();
         grid.setItems(loadBillingInfos());
         grid.addColumn(info -> customerDisplayName(info.user()))
                 .setHeader(getTranslation("admincreateinvoices.column.customer")).setFlexGrow(2).setSortable(true);
@@ -211,8 +241,16 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
 
     private List<BillingInfo> loadBillingInfos() {
         PriceTable priceTable = priceTableRepository.findAll().stream().findFirst().orElse(null);
-        return userRepository.findAll().stream().filter(this::isCurrentCustomer)
+        List<BillingInfo> infos = userRepository.findAll().stream().filter(this::isCurrentCustomer)
                 .filter(this::existedInBillingMonth).map(user -> computeBilling(user, priceTable)).toList();
+        if (invoiceFilter == InvoiceFilter.ALL) {
+            return infos;
+        }
+        java.util.Set<String> sentInvoiceNumbers = dispatchRepository.findByBillingMonth(billingMonth.toString())
+                .stream().map(SystemInvoiceDispatch::getInvoiceNumber).collect(java.util.stream.Collectors.toSet());
+        boolean wantSent = invoiceFilter == InvoiceFilter.SENT;
+        return infos.stream()
+                .filter(info -> sentInvoiceNumbers.contains(buildInvoiceNumber(info.user())) == wantSent).toList();
     }
 
     /**
@@ -535,6 +573,7 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
                         getTranslation("admincreateinvoices.mail.body", preview.invoiceNumber(), monthLabel,
                                 issuerName),
                         preview.pdf(), preview.invoiceNumber() + ".pdf");
+                recordDispatch(preview, email);
                 sent++;
             } catch (Exception ex) {
                 log.error("Error sending invoice {} to {}: {}", preview.invoiceNumber(), email, ex.getMessage(), ex);
@@ -542,6 +581,8 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
             }
         }
         if (sent > 0) {
+            grid.deselectAll();
+            grid.setItems(loadBillingInfos());
             Notification
                     .show(getTranslation("admincreateinvoices.notification.sent", sent), 5000,
                             Notification.Position.BOTTOM_CENTER)
@@ -555,6 +596,25 @@ public class AdminCreateInvoicesView extends Main implements HasDynamicTitle {
         }
     }
 
+    /**
+     * Persists (or refreshes) the dispatch record of a sent invoice so the
+     * list can be filtered into open and sent invoices.
+     */
+    private void recordDispatch(InvoicePreview preview, String email) {
+        try {
+            SystemInvoiceDispatch dispatch = dispatchRepository.findByInvoiceNumber(preview.invoiceNumber())
+                    .orElseGet(SystemInvoiceDispatch::new);
+            dispatch.setInvoiceNumber(preview.invoiceNumber());
+            dispatch.setUserId(preview.info().user().getId());
+            dispatch.setBillingMonth(billingMonth.toString());
+            dispatch.setSentAt(LocalDateTime.now());
+            dispatch.setSentTo(email);
+            dispatchRepository.save(dispatch);
+        } catch (Exception ex) {
+            log.error("Error recording dispatch of invoice {}: {}", preview.invoiceNumber(), ex.getMessage(), ex);
+        }
+    }
+
     /**
      * Returns the stored system template data, or null (with a notification)
      * if no template has been saved yet.

backend/src/main/java/de/assecutor/votianlt/repository/SystemInvoiceDispatchRepository.java

@@ -0,0 +1,15 @@
+package de.assecutor.votianlt.repository;
+
+import de.assecutor.votianlt.model.invoices.SystemInvoiceDispatch;
+import org.bson.types.ObjectId;
+import org.springframework.data.mongodb.repository.MongoRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface SystemInvoiceDispatchRepository extends MongoRepository<SystemInvoiceDispatch, ObjectId> {
+
+    List<SystemInvoiceDispatch> findByBillingMonth(String billingMonth);
+
+    Optional<SystemInvoiceDispatch> findByInvoiceNumber(String invoiceNumber);
+}

backend/src/main/resources/messages_de.properties

@@ -353,6 +353,7 @@ addcustomer.title=Neue Adresse anlegen
 addcustomer.button.submit=Adresse anlegen
 addcustomer.notification.validation=Bitte füllen Sie alle Pflichtfelder aus
 addcustomer.notification.success=Kunde erfolgreich angelegt
+addcustomer.notification.duplicate=Ein identischer Adressbucheintrag existiert bereits
 addcustomer.notification.check=Bitte überprüfen Sie Ihre Eingaben
 addcustomer.notification.error=Fehler: {0}
 addcustomer.validation.required=Dieses Feld ist erforderlich
@@ -1131,6 +1132,10 @@ admincreateinvoices.notification.notemplate=Kein Rechnungstemplate vorhanden. Bi
 admincreateinvoices.notification.error=Fehler beim Erstellen der Rechnung: {0}
 admincreateinvoices.button.createselected=Rechnungen erstellen ({0})
 admincreateinvoices.field.month=Abrechnungsmonat
+admincreateinvoices.filter.label=Anzeigen
+admincreateinvoices.filter.all=Alle Rechnungen
+admincreateinvoices.filter.open=Nur offene
+admincreateinvoices.filter.sent=Nur gesendete
 admincreateinvoices.dialog.title=Rechnungen prüfen
 admincreateinvoices.dialog.position=Rechnung {0} von {1}
 admincreateinvoices.dialog.button.previous=Zurück

backend/src/main/resources/messages_ee.properties

@@ -313,6 +313,7 @@ addcustomer.title=Uue aadressi loomine
 addcustomer.button.submit=Loo aadress
 addcustomer.notification.validation=Palun t\u00e4itke k\u00f5ik kohustuslikud v\u00e4ljad
 addcustomer.notification.success=Klient edukalt loodud
+addcustomer.notification.duplicate=Identne aadressiraamatu kirje on juba olemas
 addcustomer.notification.check=Palun kontrollige oma sisestusi
 addcustomer.notification.error=Viga: {0}
 addcustomer.validation.required=See v\u00e4li on kohustuslik
@@ -961,6 +962,10 @@ admincreateinvoices.notification.notemplate=Arve mall puudub. Palun salvestage k
 admincreateinvoices.notification.error=Viga arve koostamisel: {0}
 admincreateinvoices.button.createselected=Koosta arved ({0})
 admincreateinvoices.field.month=Arveldusperiood
+admincreateinvoices.filter.label=Kuva
+admincreateinvoices.filter.all=Kõik arved
+admincreateinvoices.filter.open=Ainult avatud
+admincreateinvoices.filter.sent=Ainult saadetud
 admincreateinvoices.dialog.title=Arvete ülevaatus
 admincreateinvoices.dialog.position=Arve {0} / {1}
 admincreateinvoices.dialog.button.previous=Tagasi

backend/src/main/resources/messages_en.properties

@@ -353,6 +353,7 @@ addcustomer.title=Create New Address
 addcustomer.button.submit=Create Address
 addcustomer.notification.validation=Please fill in all required fields
 addcustomer.notification.success=Customer created successfully
+addcustomer.notification.duplicate=An identical address book entry already exists
 addcustomer.notification.check=Please check your input
 addcustomer.notification.error=Error: {0}
 addcustomer.validation.required=This field is required
@@ -1131,6 +1132,10 @@ admincreateinvoices.notification.notemplate=No invoice template available. Pleas
 admincreateinvoices.notification.error=Error creating the invoice: {0}
 admincreateinvoices.button.createselected=Create invoices ({0})
 admincreateinvoices.field.month=Billing month
+admincreateinvoices.filter.label=Show
+admincreateinvoices.filter.all=All invoices
+admincreateinvoices.filter.open=Only open
+admincreateinvoices.filter.sent=Only sent
 admincreateinvoices.dialog.title=Review invoices
 admincreateinvoices.dialog.position=Invoice {0} of {1}
 admincreateinvoices.dialog.button.previous=Back

backend/src/main/resources/messages_es.properties

@@ -352,6 +352,7 @@ addcustomer.title=Crear nueva dirección
 addcustomer.button.submit=Crear dirección
 addcustomer.notification.validation=Por favor, complete todos los campos obligatorios
 addcustomer.notification.success=Cliente creado correctamente
+addcustomer.notification.duplicate=Ya existe una entrada idéntica en la libreta de direcciones
 addcustomer.notification.check=Por favor, revise sus datos
 addcustomer.notification.error=Error: {0}
 addcustomer.validation.required=Este campo es obligatorio
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=No hay plantilla de factura. Guarde
 admincreateinvoices.notification.error=Error al crear la factura: {0}
 admincreateinvoices.button.createselected=Crear facturas ({0})
 admincreateinvoices.field.month=Mes de facturación
+admincreateinvoices.filter.label=Mostrar
+admincreateinvoices.filter.all=Todas las facturas
+admincreateinvoices.filter.open=Solo abiertas
+admincreateinvoices.filter.sent=Solo enviadas
 admincreateinvoices.dialog.title=Revisar facturas
 admincreateinvoices.dialog.position=Factura {0} de {1}
 admincreateinvoices.dialog.button.previous=Atrás

backend/src/main/resources/messages_fr.properties

@@ -352,6 +352,7 @@ addcustomer.title=Cr\u00e9er une nouvelle adresse
 addcustomer.button.submit=Cr\u00e9er l'adresse
 addcustomer.notification.validation=Veuillez remplir tous les champs obligatoires
 addcustomer.notification.success=Client cr\u00e9\u00e9 avec succ\u00e8s
+addcustomer.notification.duplicate=Une entr\u00e9e identique existe d\u00e9j\u00e0 dans le carnet d'adresses
 addcustomer.notification.check=Veuillez v\u00e9rifier vos saisies
 addcustomer.notification.error=Erreur : {0}
 addcustomer.validation.required=Ce champ est obligatoire
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=Aucun modèle de facture disponible.
 admincreateinvoices.notification.error=Erreur lors de la création de la facture : {0}
 admincreateinvoices.button.createselected=Créer les factures ({0})
 admincreateinvoices.field.month=Mois de facturation
+admincreateinvoices.filter.label=Afficher
+admincreateinvoices.filter.all=Toutes les factures
+admincreateinvoices.filter.open=Uniquement ouvertes
+admincreateinvoices.filter.sent=Uniquement envoyées
 admincreateinvoices.dialog.title=Vérifier les factures
 admincreateinvoices.dialog.position=Facture {0} sur {1}
 admincreateinvoices.dialog.button.previous=Retour

backend/src/main/resources/messages_lt.properties

@@ -352,6 +352,7 @@ addcustomer.title=Sukurti naują adresą
 addcustomer.button.submit=Sukurti adresą
 addcustomer.notification.validation=Prašome užpildyti visus privalomus laukus
 addcustomer.notification.success=Klientas sėkmingai sukurtas
+addcustomer.notification.duplicate=Identiškas adresų knygos įrašas jau egzistuoja
 addcustomer.notification.check=Prašome patikrinti savo įvestį
 addcustomer.notification.error=Klaida: {0}
 addcustomer.validation.required=Šis laukas yra privalomas
@@ -1064,6 +1065,10 @@ admincreateinvoices.notification.notemplate=Nėra sąskaitos šablono. Pirmiausi
 admincreateinvoices.notification.error=Klaida kuriant sąskaitą: {0}
 admincreateinvoices.button.createselected=Sukurti sąskaitas ({0})
 admincreateinvoices.field.month=Atsiskaitymo mėnuo
+admincreateinvoices.filter.label=Rodyti
+admincreateinvoices.filter.all=Visos sąskaitos
+admincreateinvoices.filter.open=Tik atviros
+admincreateinvoices.filter.sent=Tik išsiųstos
 admincreateinvoices.dialog.title=Peržiūrėti sąskaitas
 admincreateinvoices.dialog.position=Sąskaita {0} iš {1}
 admincreateinvoices.dialog.button.previous=Atgal

backend/src/main/resources/messages_lv.properties

@@ -352,6 +352,7 @@ addcustomer.title=Izveidot jaunu adresi
 addcustomer.button.submit=Izveidot adresi
 addcustomer.notification.validation=Lūdzu, aizpildiet visus obligātos laukus
 addcustomer.notification.success=Klients veiksmīgi izveidots
+addcustomer.notification.duplicate=Identisks adrešu grāmatas ieraksts jau pastāv
 addcustomer.notification.check=Lūdzu, pārbaudiet savus ievadītos datus
 addcustomer.notification.error=Kļūda: {0}
 addcustomer.validation.required=Šis lauks ir obligāts
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=Nav rēķina veidnes. Lūdzu, vispir
 admincreateinvoices.notification.error=Kļūda, veidojot rēķinu: {0}
 admincreateinvoices.button.createselected=Izveidot rēķinus ({0})
 admincreateinvoices.field.month=Norēķinu mēnesis
+admincreateinvoices.filter.label=Rādīt
+admincreateinvoices.filter.all=Visi rēķini
+admincreateinvoices.filter.open=Tikai atvērtie
+admincreateinvoices.filter.sent=Tikai nosūtītie
 admincreateinvoices.dialog.title=Pārskatīt rēķinus
 admincreateinvoices.dialog.position=Rēķins {0} no {1}
 admincreateinvoices.dialog.button.previous=Atpakaļ

backend/src/main/resources/messages_pl.properties

@@ -352,6 +352,7 @@ addcustomer.title=Dodaj nowy adres
 addcustomer.button.submit=Dodaj adres
 addcustomer.notification.validation=Prosz\u0119 wype\u0142ni\u0107 wszystkie wymagane pola
 addcustomer.notification.success=Klient zosta\u0142 pomy\u015blnie dodany
+addcustomer.notification.duplicate=Identyczny wpis w ksi\u0105\u017cce adresowej ju\u017c istnieje
 addcustomer.notification.check=Prosz\u0119 sprawdzi\u0107 wprowadzone dane
 addcustomer.notification.error=B\u0142\u0105d: {0}
 addcustomer.validation.required=To pole jest wymagane
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=Brak szablonu faktury. Najpierw zapi
 admincreateinvoices.notification.error=Błąd podczas tworzenia faktury: {0}
 admincreateinvoices.button.createselected=Utwórz faktury ({0})
 admincreateinvoices.field.month=Miesiąc rozliczeniowy
+admincreateinvoices.filter.label=Pokaż
+admincreateinvoices.filter.all=Wszystkie faktury
+admincreateinvoices.filter.open=Tylko otwarte
+admincreateinvoices.filter.sent=Tylko wysłane
 admincreateinvoices.dialog.title=Przegląd faktur
 admincreateinvoices.dialog.position=Faktura {0} z {1}
 admincreateinvoices.dialog.button.previous=Wstecz

backend/src/main/resources/messages_ru.properties

@@ -352,6 +352,7 @@ addcustomer.title=Создать новый адрес
 addcustomer.button.submit=Создать адрес
 addcustomer.notification.validation=Пожалуйста, заполните все обязательные поля
 addcustomer.notification.success=Клиент успешно создан
+addcustomer.notification.duplicate=Идентичная запись в адресной книге уже существует
 addcustomer.notification.check=Пожалуйста, проверьте ваши данные
 addcustomer.notification.error=Ошибка: {0}
 addcustomer.validation.required=Это поле обязательно для заполнения
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=Шаблон счета отсутс
 admincreateinvoices.notification.error=Ошибка при создании счета: {0}
 admincreateinvoices.button.createselected=Создать счета ({0})
 admincreateinvoices.field.month=Расчетный месяц
+admincreateinvoices.filter.label=Показать
+admincreateinvoices.filter.all=Все счета
+admincreateinvoices.filter.open=Только открытые
+admincreateinvoices.filter.sent=Только отправленные
 admincreateinvoices.dialog.title=Проверка счетов
 admincreateinvoices.dialog.position=Счет {0} из {1}
 admincreateinvoices.dialog.button.previous=Назад

backend/src/main/resources/messages_tr.properties

@@ -352,6 +352,7 @@ addcustomer.title=Yeni Adres Olu\u015ftur
 addcustomer.button.submit=Adres Olu\u015ftur
 addcustomer.notification.validation=L\u00fctfen t\u00fcm zorunlu alanlar\u0131 doldurun
 addcustomer.notification.success=M\u00fc\u015fteri ba\u015far\u0131yla olu\u015fturuldu
+addcustomer.notification.duplicate=Adres defterinde ayn\u0131 kay\u0131t zaten mevcut
 addcustomer.notification.check=L\u00fctfen giri\u015flerinizi kontrol edin
 addcustomer.notification.error=Hata: {0}
 addcustomer.validation.required=Bu alan gereklidir
@@ -1062,6 +1063,10 @@ admincreateinvoices.notification.notemplate=Fatura şablonu yok. Lütfen önce f
 admincreateinvoices.notification.error=Fatura oluşturulurken hata: {0}
 admincreateinvoices.button.createselected=Fatura oluştur ({0})
 admincreateinvoices.field.month=Fatura ayı
+admincreateinvoices.filter.label=Göster
+admincreateinvoices.filter.all=Tüm faturalar
+admincreateinvoices.filter.open=Yalnızca açık
+admincreateinvoices.filter.sent=Yalnızca gönderilen
 admincreateinvoices.dialog.title=Faturaları incele
 admincreateinvoices.dialog.position=Fatura {0} / {1}
 admincreateinvoices.dialog.button.previous=Geri