refactor(usermanagement,masterdata): UnitOfWork-Pattern + JdbcClient-Migration

Migriert UserManagement und MasterData BCs von JPA/Spring Data auf
JdbcClient + UnitOfWork, analog zum Production-BC. Inventory bleibt auf JPA.

- 6 neue JdbcClient-Repositories (User, Role, Article, Supplier, Customer, ProductCategory)
- 45 Use Cases: UoW für schreibende, @Transactional entfernt bei allen
- AbstractIntegrationTest + 20 Integration-Tests auf JdbcClient umgestellt
- 12 Unit-Test-Klassen mit UoW-Mock erweitert
- 34 alte JPA-Dateien gelöscht (Entities, Spring Data Repos, Adapter, Mapper)

backend/src/main/java/de/effigenix/application/masterdata/ActivateArticle.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class ActivateArticle {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public ActivateArticle(ArticleRepository articleRepository) {
+    public ActivateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(ArticleId articleId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class ActivateArticle {
         }
         article.activate();
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/ActivateCustomer.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class ActivateCustomer {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public ActivateCustomer(CustomerRepository customerRepository) {
+    public ActivateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(CustomerId customerId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class ActivateCustomer {
         }
         customer.activate();
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/ActivateSupplier.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class ActivateSupplier {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public ActivateSupplier(SupplierRepository supplierRepository) {
+    public ActivateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(SupplierId supplierId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class ActivateSupplier {
         }
         supplier.activate();
 
-        switch (supplierRepository.save(supplier)) {
-            case Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/AddCertificate.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.AddCertificateCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class AddCertificate {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public AddCertificate(SupplierRepository supplierRepository) {
+    public AddCertificate(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(AddCertificateCommand cmd, ActorId performedBy) {
@@ -39,12 +40,13 @@ public class AddCertificate {
         }
         supplier.addCertificate(certificate);
 
-        switch (supplierRepository.save(supplier)) {
-            case Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/AddDeliveryAddress.java

@@ -4,18 +4,19 @@ import de.effigenix.application.masterdata.command.AddDeliveryAddressCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Address;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class AddDeliveryAddress {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public AddDeliveryAddress(CustomerRepository customerRepository) {
+    public AddDeliveryAddress(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(AddDeliveryAddressCommand cmd, ActorId performedBy) {
@@ -46,12 +47,13 @@ public class AddDeliveryAddress {
         }
         customer.addDeliveryAddress(deliveryAddress);
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/AddSalesUnit.java

@@ -4,18 +4,19 @@ import de.effigenix.application.masterdata.command.AddSalesUnitCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Money;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class AddSalesUnit {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public AddSalesUnit(ArticleRepository articleRepository) {
+    public AddSalesUnit(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(AddSalesUnitCommand cmd, ActorId performedBy) {
@@ -50,12 +51,13 @@ public class AddSalesUnit {
             case Success(var ignored) -> { }
         }
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/AssignSupplier.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.AssignSupplierCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class AssignSupplier {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public AssignSupplier(ArticleRepository articleRepository) {
+    public AssignSupplier(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(AssignSupplierCommand cmd, ActorId performedBy) {
@@ -33,12 +34,13 @@ public class AssignSupplier {
         }
         article.addSupplierReference(SupplierId.of(cmd.supplierId()));
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/CreateArticle.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.CreateArticleCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class CreateArticle {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public CreateArticle(ArticleRepository articleRepository) {
+    public CreateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(CreateArticleCommand cmd, ActorId performedBy) {
@@ -37,12 +38,13 @@ public class CreateArticle {
             }
         }
 
-        switch (articleRepository.save(article)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/CreateCustomer.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.CreateCustomerCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class CreateCustomer {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public CreateCustomer(CustomerRepository customerRepository) {
+    public CreateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(CreateCustomerCommand cmd, ActorId performedBy) {
@@ -38,12 +39,13 @@ public class CreateCustomer {
             }
         }
 
-        switch (customerRepository.save(customer)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/CreateProductCategory.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.CreateProductCategoryCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class CreateProductCategory {
 
     private final ProductCategoryRepository categoryRepository;
+    private final UnitOfWork unitOfWork;
 
-    public CreateProductCategory(ProductCategoryRepository categoryRepository) {
+    public CreateProductCategory(ProductCategoryRepository categoryRepository, UnitOfWork unitOfWork) {
         this.categoryRepository = categoryRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ProductCategoryError, ProductCategory> execute(CreateProductCategoryCommand cmd, ActorId performedBy) {
@@ -34,12 +35,13 @@ public class CreateProductCategory {
             }
         }
 
-        switch (categoryRepository.save(category)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(category);
+        return unitOfWork.executeAtomically(() -> {
+            switch (categoryRepository.save(category)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(category);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/CreateSupplier.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.CreateSupplierCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class CreateSupplier {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public CreateSupplier(SupplierRepository supplierRepository) {
+    public CreateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(CreateSupplierCommand cmd, ActorId performedBy) {
@@ -42,12 +43,13 @@ public class CreateSupplier {
         }
 
         // 4. Speichern
-        switch (supplierRepository.save(supplier)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/DeactivateArticle.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class DeactivateArticle {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public DeactivateArticle(ArticleRepository articleRepository) {
+    public DeactivateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(ArticleId articleId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class DeactivateArticle {
         }
         article.deactivate();
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/DeactivateCustomer.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class DeactivateCustomer {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public DeactivateCustomer(CustomerRepository customerRepository) {
+    public DeactivateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(CustomerId customerId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class DeactivateCustomer {
         }
         customer.deactivate();
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/DeactivateSupplier.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class DeactivateSupplier {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public DeactivateSupplier(SupplierRepository supplierRepository) {
+    public DeactivateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(SupplierId supplierId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class DeactivateSupplier {
         }
         supplier.deactivate();
 
-        switch (supplierRepository.save(supplier)) {
-            case Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/DeleteProductCategory.java

@@ -2,20 +2,21 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class DeleteProductCategory {
 
     private final ProductCategoryRepository categoryRepository;
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public DeleteProductCategory(ProductCategoryRepository categoryRepository, ArticleRepository articleRepository) {
+    public DeleteProductCategory(ProductCategoryRepository categoryRepository, ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.categoryRepository = categoryRepository;
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ProductCategoryError, Void> execute(ProductCategoryId categoryId, ActorId performedBy) {
@@ -31,22 +32,24 @@ public class DeleteProductCategory {
             }
         }
 
-        switch (articleRepository.findByCategory(categoryId)) {
-            case Failure(var err) ->
-                { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
-            case Success(var articles) -> {
-                if (!articles.isEmpty()) {
-                    return Result.failure(new ProductCategoryError.CategoryInUse(categoryId));
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.findByCategory(categoryId)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
+                case Success(var articles) -> {
+                    if (!articles.isEmpty()) {
+                        return Result.failure(new ProductCategoryError.CategoryInUse(categoryId));
+                    }
                 }
             }
-        }
 
-        switch (categoryRepository.delete(category)) {
-            case Failure(var err) ->
-                { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
+            switch (categoryRepository.delete(category)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
 
-        return Result.success(null);
+            return Result.success(null);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/GetArticle.java

@@ -2,11 +2,9 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class GetArticle {
 
     private final ArticleRepository articleRepository;

backend/src/main/java/de/effigenix/application/masterdata/GetCustomer.java

@@ -2,11 +2,9 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class GetCustomer {
 
     private final CustomerRepository customerRepository;

backend/src/main/java/de/effigenix/application/masterdata/GetSupplier.java

@@ -2,11 +2,9 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class GetSupplier {
 
     private final SupplierRepository supplierRepository;

backend/src/main/java/de/effigenix/application/masterdata/ListArticles.java

@@ -2,13 +2,11 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class ListArticles {
 
     private final ArticleRepository articleRepository;

backend/src/main/java/de/effigenix/application/masterdata/ListCustomers.java

@@ -2,13 +2,11 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class ListCustomers {
 
     private final CustomerRepository customerRepository;

backend/src/main/java/de/effigenix/application/masterdata/ListProductCategories.java

@@ -2,13 +2,11 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class ListProductCategories {
 
     private final ProductCategoryRepository categoryRepository;

backend/src/main/java/de/effigenix/application/masterdata/ListSuppliers.java

@@ -2,13 +2,11 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional(readOnly = true)
 public class ListSuppliers {
 
     private final SupplierRepository supplierRepository;

backend/src/main/java/de/effigenix/application/masterdata/RateSupplier.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.RateSupplierCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RateSupplier {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RateSupplier(SupplierRepository supplierRepository) {
+    public RateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(RateSupplierCommand cmd, ActorId performedBy) {
@@ -39,12 +40,13 @@ public class RateSupplier {
         }
         supplier.rate(rating);
 
-        switch (supplierRepository.save(supplier)) {
-            case Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/RemoveCertificate.java

@@ -3,20 +3,21 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.RemoveCertificateCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Objects;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RemoveCertificate {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RemoveCertificate(SupplierRepository supplierRepository) {
+    public RemoveCertificate(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(RemoveCertificateCommand cmd, ActorId performedBy) {
@@ -45,12 +46,13 @@ public class RemoveCertificate {
         }
         supplier.removeCertificate(certificate.get());
 
-        switch (supplierRepository.save(supplier)) {
-            case Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/RemoveDeliveryAddress.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.RemoveDeliveryAddressCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RemoveDeliveryAddress {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RemoveDeliveryAddress(CustomerRepository customerRepository) {
+    public RemoveDeliveryAddress(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(RemoveDeliveryAddressCommand cmd, ActorId performedBy) {
@@ -33,12 +34,13 @@ public class RemoveDeliveryAddress {
         }
         customer.removeDeliveryAddress(cmd.label());
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/RemoveFrameContract.java

@@ -2,18 +2,19 @@ package de.effigenix.application.masterdata;
 
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RemoveFrameContract {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RemoveFrameContract(CustomerRepository customerRepository) {
+    public RemoveFrameContract(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(CustomerId customerId, ActorId performedBy) {
@@ -30,12 +31,13 @@ public class RemoveFrameContract {
         }
         customer.removeFrameContract();
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/RemoveSalesUnit.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.RemoveSalesUnitCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RemoveSalesUnit {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RemoveSalesUnit(ArticleRepository articleRepository) {
+    public RemoveSalesUnit(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(RemoveSalesUnitCommand cmd, ActorId performedBy) {
@@ -37,12 +38,13 @@ public class RemoveSalesUnit {
             case Success(var ignored) -> { }
         }
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/RemoveSupplier.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.RemoveSupplierCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class RemoveSupplier {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public RemoveSupplier(ArticleRepository articleRepository) {
+    public RemoveSupplier(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(RemoveSupplierCommand cmd, ActorId performedBy) {
@@ -33,12 +34,13 @@ public class RemoveSupplier {
         }
         article.removeSupplierReference(SupplierId.of(cmd.supplierId()));
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/SetFrameContract.java

@@ -4,20 +4,21 @@ import de.effigenix.application.masterdata.command.SetFrameContractCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Money;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.ArrayList;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class SetFrameContract {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public SetFrameContract(CustomerRepository customerRepository) {
+    public SetFrameContract(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(SetFrameContractCommand cmd, ActorId performedBy) {
@@ -62,12 +63,13 @@ public class SetFrameContract {
             case Success(var ignored) -> { }
         }
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/SetPreferences.java

@@ -3,18 +3,19 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.SetPreferencesCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class SetPreferences {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public SetPreferences(CustomerRepository customerRepository) {
+    public SetPreferences(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(SetPreferencesCommand cmd, ActorId performedBy) {
@@ -33,12 +34,13 @@ public class SetPreferences {
         }
         customer.setPreferences(cmd.preferences());
 
-        switch (customerRepository.save(customer)) {
-            case Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/UpdateArticle.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.UpdateArticleCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class UpdateArticle {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateArticle(ArticleRepository articleRepository) {
+    public UpdateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(UpdateArticleCommand cmd, ActorId performedBy) {
@@ -36,12 +37,13 @@ public class UpdateArticle {
             case Result.Success(var ignored) -> { }
         }
 
-        switch (articleRepository.save(article)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/UpdateCustomer.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.UpdateCustomerCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class UpdateCustomer {
 
     private final CustomerRepository customerRepository;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateCustomer(CustomerRepository customerRepository) {
+    public UpdateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
         this.customerRepository = customerRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<CustomerError, Customer> execute(UpdateCustomerCommand cmd, ActorId performedBy) {
@@ -40,12 +41,13 @@ public class UpdateCustomer {
             case Result.Success(var ignored) -> { }
         }
 
-        switch (customerRepository.save(customer)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(customer);
+        return unitOfWork.executeAtomically(() -> {
+            switch (customerRepository.save(customer)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new CustomerError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(customer);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/UpdateProductCategory.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.UpdateProductCategoryCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class UpdateProductCategory {
 
     private final ProductCategoryRepository categoryRepository;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateProductCategory(ProductCategoryRepository categoryRepository) {
+    public UpdateProductCategory(ProductCategoryRepository categoryRepository, UnitOfWork unitOfWork) {
         this.categoryRepository = categoryRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ProductCategoryError, ProductCategory> execute(UpdateProductCategoryCommand cmd, ActorId performedBy) {
@@ -36,12 +37,13 @@ public class UpdateProductCategory {
             case Result.Success(var ignored) -> { }
         }
 
-        switch (categoryRepository.save(category)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(category);
+        return unitOfWork.executeAtomically(() -> {
+            switch (categoryRepository.save(category)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new ProductCategoryError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(category);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/UpdateSalesUnitPrice.java

@@ -4,18 +4,19 @@ import de.effigenix.application.masterdata.command.UpdateSalesUnitPriceCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Money;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import static de.effigenix.shared.common.Result.*;
 
-@Transactional
 public class UpdateSalesUnitPrice {
 
     private final ArticleRepository articleRepository;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateSalesUnitPrice(ArticleRepository articleRepository) {
+    public UpdateSalesUnitPrice(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
         this.articleRepository = articleRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<ArticleError, Article> execute(UpdateSalesUnitPriceCommand cmd, ActorId performedBy) {
@@ -44,12 +45,13 @@ public class UpdateSalesUnitPrice {
             case Success(var ignored) -> { }
         }
 
-        switch (articleRepository.save(article)) {
-            case Failure(var err) ->
-                { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
-            case Success(var ignored) -> { }
-        }
-
-        return Result.success(article);
+        return unitOfWork.executeAtomically(() -> {
+            switch (articleRepository.save(article)) {
+                case Failure(var err) ->
+                    { return Result.failure(new ArticleError.RepositoryFailure(err.message())); }
+                case Success(var ignored) -> { }
+            }
+            return Result.success(article);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/masterdata/UpdateSupplier.java

@@ -3,16 +3,17 @@ package de.effigenix.application.masterdata;
 import de.effigenix.application.masterdata.command.UpdateSupplierCommand;
 import de.effigenix.domain.masterdata.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
-@Transactional
 public class UpdateSupplier {
 
     private final SupplierRepository supplierRepository;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateSupplier(SupplierRepository supplierRepository) {
+    public UpdateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
         this.supplierRepository = supplierRepository;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<SupplierError, Supplier> execute(UpdateSupplierCommand cmd, ActorId performedBy) {
@@ -43,12 +44,13 @@ public class UpdateSupplier {
         }
 
         // 3. Speichern
-        switch (supplierRepository.save(supplier)) {
-            case Result.Failure(var err) ->
-                { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
-            case Result.Success(var ignored) -> { }
-        }
-
-        return Result.success(supplier);
+        return unitOfWork.executeAtomically(() -> {
+            switch (supplierRepository.save(supplier)) {
+                case Result.Failure(var err) ->
+                    { return Result.failure(new SupplierError.RepositoryFailure(err.message())); }
+                case Result.Success(var ignored) -> { }
+            }
+            return Result.success(supplier);
+        });
     }
 }

backend/src/main/java/de/effigenix/application/usermanagement/AssignRole.java

@@ -6,32 +6,34 @@ import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.RepositoryError;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Optional;
 
 /**
  * Use Case: Assign a role to a user.
  */
-@Transactional
 public class AssignRole {
 
     private final UserRepository userRepository;
     private final RoleRepository roleRepository;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
     public AssignRole(
             UserRepository userRepository,
             RoleRepository roleRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
         this.userRepository = userRepository;
         this.roleRepository = roleRepository;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(AssignRoleCommand cmd, ActorId performedBy) {
@@ -61,12 +63,13 @@ public class AssignRole {
                     }
                     Role role = optRole.get();
                     return user.assignRole(role)
-                            .flatMap(updated -> userRepository.save(updated)
-                                    .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                                    .map(ignored -> {
-                                        auditLogger.log(AuditEvent.ROLE_ASSIGNED, updated.id().value(), "Role: " + role.name(), performedBy);
-                                        return UserDTO.from(updated);
-                                    }));
+                            .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                                    userRepository.save(updated)
+                                            .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                            .map(ignored -> {
+                                                auditLogger.log(AuditEvent.ROLE_ASSIGNED, updated.id().value(), "Role: " + role.name(), performedBy);
+                                                return UserDTO.from(updated);
+                                            })));
                 });
     }
 

backend/src/main/java/de/effigenix/application/usermanagement/AuthenticateUser.java

@@ -4,8 +4,8 @@ import de.effigenix.application.usermanagement.command.AuthenticateCommand;
 import de.effigenix.application.usermanagement.dto.SessionToken;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.ActorId;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
@@ -17,24 +17,26 @@ import java.util.Optional;
  * Returns a JWT session token on success.
  * Logs all authentication attempts for security auditing.
  */
-@Transactional
 public class AuthenticateUser {
 
     private final UserRepository userRepository;
     private final PasswordHasher passwordHasher;
     private final SessionManager sessionManager;
     private final AuditLogger auditLogger;
+    private final UnitOfWork unitOfWork;
 
     public AuthenticateUser(
             UserRepository userRepository,
             PasswordHasher passwordHasher,
             SessionManager sessionManager,
-            AuditLogger auditLogger
+            AuditLogger auditLogger,
+            UnitOfWork unitOfWork
     ) {
         this.userRepository = userRepository;
         this.passwordHasher = passwordHasher;
         this.sessionManager = sessionManager;
         this.auditLogger = auditLogger;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, SessionToken> execute(AuthenticateCommand cmd) {
@@ -73,11 +75,12 @@ public class AuthenticateUser {
 
         // 5. Update last login timestamp (immutable)
         return user.withLastLogin(OffsetDateTime.now(ZoneOffset.UTC))
-                .flatMap(updated -> userRepository.save(updated)
-                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                        .map(ignored -> {
-                            auditLogger.log(AuditEvent.LOGIN_SUCCESS, updated.id().value(), ActorId.of(updated.id().value()));
-                            return token;
-                        }));
+                .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                        userRepository.save(updated)
+                                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                .map(ignored -> {
+                                    auditLogger.log(AuditEvent.LOGIN_SUCCESS, updated.id().value(), ActorId.of(updated.id().value()));
+                                    return token;
+                                })));
     }
 }

backend/src/main/java/de/effigenix/application/usermanagement/ChangePassword.java

@@ -4,8 +4,8 @@ import de.effigenix.application.usermanagement.command.ChangePasswordCommand;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Change user password.
@@ -13,24 +13,26 @@ import org.springframework.transaction.annotation.Transactional;
  * Requires current password verification for security.
  * Self-service: users can change their own password without PASSWORD_CHANGE permission.
  */
-@Transactional
 public class ChangePassword {
 
     private final UserRepository userRepository;
     private final PasswordHasher passwordHasher;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
     public ChangePassword(
             UserRepository userRepository,
             PasswordHasher passwordHasher,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
         this.userRepository = userRepository;
         this.passwordHasher = passwordHasher;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, Void> execute(ChangePasswordCommand cmd, ActorId performedBy) {
@@ -71,12 +73,13 @@ public class ChangePassword {
         // 5. Hash and update (immutable)
         PasswordHash newPasswordHash = passwordHasher.hash(cmd.newPassword());
         return user.changePassword(newPasswordHash)
-                .flatMap(updated -> userRepository.save(updated)
-                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                        .map(ignored -> {
-                            auditLogger.log(AuditEvent.PASSWORD_CHANGED, updated.id().value(), performedBy);
-                            return null;
-                        }));
+                .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                        userRepository.save(updated)
+                                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                .map(ignored -> {
+                                    auditLogger.log(AuditEvent.PASSWORD_CHANGED, updated.id().value(), performedBy);
+                                    return null;
+                                })));
     }
 
     private Result<UserError, User> findUser(UserId userId) {

backend/src/main/java/de/effigenix/application/usermanagement/CreateUser.java

@@ -6,8 +6,8 @@ import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.RepositoryError;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -15,7 +15,6 @@ import java.util.Set;
 /**
  * Use Case: Create a new user account.
  */
-@Transactional
 public class CreateUser {
 
     private final UserRepository userRepository;
@@ -23,19 +22,22 @@ public class CreateUser {
     private final PasswordHasher passwordHasher;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
     public CreateUser(
             UserRepository userRepository,
             RoleRepository roleRepository,
             PasswordHasher passwordHasher,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
         this.userRepository = userRepository;
         this.roleRepository = roleRepository;
         this.passwordHasher = passwordHasher;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(CreateUserCommand cmd, ActorId performedBy) {
@@ -99,11 +101,12 @@ public class CreateUser {
         }
 
         return User.create(cmd.username(), cmd.email(), passwordHash, roles, cmd.branchId())
-                .flatMap(user -> userRepository.save(user)
-                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                        .map(ignored -> {
-                            auditLogger.log(AuditEvent.USER_CREATED, user.id().value(), performedBy);
-                            return UserDTO.from(user);
-                        }));
+                .flatMap(user -> unitOfWork.executeAtomically(() ->
+                        userRepository.save(user)
+                                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                .map(ignored -> {
+                                    auditLogger.log(AuditEvent.USER_CREATED, user.id().value(), performedBy);
+                                    return UserDTO.from(user);
+                                })));
     }
 }

backend/src/main/java/de/effigenix/application/usermanagement/GetUser.java

@@ -5,12 +5,10 @@ import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Get a single user by ID.
  */
-@Transactional(readOnly = true)
 public class GetUser {
 
     private final UserRepository userRepository;

backend/src/main/java/de/effigenix/application/usermanagement/ListUsers.java

@@ -8,7 +8,6 @@ import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
 import de.effigenix.shared.security.AuthorizationPort;
 import de.effigenix.shared.security.BranchId;
-import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 import java.util.stream.Collectors;
@@ -16,7 +15,6 @@ import java.util.stream.Collectors;
 /**
  * Use Case: List all users (with optional branch filtering).
  */
-@Transactional(readOnly = true)
 public class ListUsers {
 
     private final UserRepository userRepository;

backend/src/main/java/de/effigenix/application/usermanagement/LockUser.java

@@ -5,23 +5,24 @@ import de.effigenix.application.usermanagement.dto.UserDTO;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Lock a user account (prevent login).
  */
-@Transactional
 public class LockUser {
 
     private final UserRepository userRepository;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
-    public LockUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort) {
+    public LockUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort, UnitOfWork unitOfWork) {
         this.userRepository = userRepository;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(LockUserCommand cmd, ActorId performedBy) {
@@ -38,12 +39,13 @@ public class LockUser {
         UserId userId = UserId.of(cmd.userId());
         return findUser(userId)
                 .flatMap(User::lock)
-                .flatMap(updated -> userRepository.save(updated)
-                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                        .map(ignored -> {
-                            auditLogger.log(AuditEvent.USER_LOCKED, updated.id().value(), performedBy);
-                            return UserDTO.from(updated);
-                        }));
+                .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                        userRepository.save(updated)
+                                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                .map(ignored -> {
+                                    auditLogger.log(AuditEvent.USER_LOCKED, updated.id().value(), performedBy);
+                                    return UserDTO.from(updated);
+                                })));
     }
 
     private Result<UserError, User> findUser(UserId userId) {

backend/src/main/java/de/effigenix/application/usermanagement/RemoveRole.java

@@ -5,30 +5,32 @@ import de.effigenix.application.usermanagement.dto.UserDTO;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Remove a role from a user.
  */
-@Transactional
 public class RemoveRole {
 
     private final UserRepository userRepository;
     private final RoleRepository roleRepository;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
     public RemoveRole(
             UserRepository userRepository,
             RoleRepository roleRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
         this.userRepository = userRepository;
         this.roleRepository = roleRepository;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(RemoveRoleCommand cmd, ActorId performedBy) {
@@ -58,12 +60,13 @@ public class RemoveRole {
                     }
                     Role role = optRole.get();
                     return user.removeRole(role)
-                            .flatMap(updated -> userRepository.save(updated)
-                                    .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                                    .map(ignored -> {
-                                        auditLogger.log(AuditEvent.ROLE_REMOVED, updated.id().value(), "Role: " + role.name(), performedBy);
-                                        return UserDTO.from(updated);
-                                    }));
+                            .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                                    userRepository.save(updated)
+                                            .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                            .map(ignored -> {
+                                                auditLogger.log(AuditEvent.ROLE_REMOVED, updated.id().value(), "Role: " + role.name(), performedBy);
+                                                return UserDTO.from(updated);
+                                            })));
                 });
     }
 

backend/src/main/java/de/effigenix/application/usermanagement/UnlockUser.java

@@ -5,23 +5,24 @@ import de.effigenix.application.usermanagement.dto.UserDTO;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Unlock a user account (allow login).
  */
-@Transactional
 public class UnlockUser {
 
     private final UserRepository userRepository;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
-    public UnlockUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort) {
+    public UnlockUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort, UnitOfWork unitOfWork) {
         this.userRepository = userRepository;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(UnlockUserCommand cmd, ActorId performedBy) {
@@ -38,12 +39,13 @@ public class UnlockUser {
         UserId userId = UserId.of(cmd.userId());
         return findUser(userId)
                 .flatMap(User::unlock)
-                .flatMap(updated -> userRepository.save(updated)
-                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                        .map(ignored -> {
-                            auditLogger.log(AuditEvent.USER_UNLOCKED, updated.id().value(), performedBy);
-                            return UserDTO.from(updated);
-                        }));
+                .flatMap(updated -> unitOfWork.executeAtomically(() ->
+                        userRepository.save(updated)
+                                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                                .map(ignored -> {
+                                    auditLogger.log(AuditEvent.USER_UNLOCKED, updated.id().value(), performedBy);
+                                    return UserDTO.from(updated);
+                                })));
     }
 
     private Result<UserError, User> findUser(UserId userId) {

backend/src/main/java/de/effigenix/application/usermanagement/UpdateUser.java

@@ -5,23 +5,24 @@ import de.effigenix.application.usermanagement.dto.UserDTO;
 import de.effigenix.domain.usermanagement.*;
 import de.effigenix.shared.common.Result;
 import de.effigenix.shared.security.ActorId;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Use Case: Update user details (email, branch).
  */
-@Transactional
 public class UpdateUser {
 
     private final UserRepository userRepository;
     private final AuditLogger auditLogger;
     private final AuthorizationPort authPort;
+    private final UnitOfWork unitOfWork;
 
-    public UpdateUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort) {
+    public UpdateUser(UserRepository userRepository, AuditLogger auditLogger, AuthorizationPort authPort, UnitOfWork unitOfWork) {
         this.userRepository = userRepository;
         this.auditLogger = auditLogger;
         this.authPort = authPort;
+        this.unitOfWork = unitOfWork;
     }
 
     public Result<UserError, UserDTO> execute(UpdateUserCommand cmd, ActorId performedBy) {
@@ -54,12 +55,13 @@ public class UpdateUser {
             current = current.flatMap(u -> u.updateBranch(cmd.branchId()));
         }
 
-        return current.flatMap(updated -> userRepository.save(updated)
-                .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
-                .map(ignored -> {
-                    auditLogger.log(AuditEvent.USER_UPDATED, updated.id().value(), performedBy);
-                    return UserDTO.from(updated);
-                }));
+        return current.flatMap(updated -> unitOfWork.executeAtomically(() ->
+                userRepository.save(updated)
+                        .mapError(err -> (UserError) new UserError.RepositoryFailure(err.message()))
+                        .map(ignored -> {
+                            auditLogger.log(AuditEvent.USER_UPDATED, updated.id().value(), performedBy);
+                            return UserDTO.from(updated);
+                        })));
     }
 
     private Result<UserError, User> findUser(UserId userId) {

backend/src/main/java/de/effigenix/infrastructure/config/MasterDataUseCaseConfiguration.java

@@ -5,6 +5,7 @@ import de.effigenix.domain.masterdata.ArticleRepository;
 import de.effigenix.domain.masterdata.CustomerRepository;
 import de.effigenix.domain.masterdata.ProductCategoryRepository;
 import de.effigenix.domain.masterdata.SupplierRepository;
+import de.effigenix.shared.persistence.UnitOfWork;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -14,13 +15,13 @@ public class MasterDataUseCaseConfiguration {
     // ==================== Article Use Cases ====================
 
     @Bean
-    public CreateArticle createArticle(ArticleRepository articleRepository) {
-        return new CreateArticle(articleRepository);
+    public CreateArticle createArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new CreateArticle(articleRepository, unitOfWork);
     }
 
     @Bean
-    public UpdateArticle updateArticle(ArticleRepository articleRepository) {
-        return new UpdateArticle(articleRepository);
+    public UpdateArticle updateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new UpdateArticle(articleRepository, unitOfWork);
     }
 
     @Bean
@@ -34,50 +35,50 @@ public class MasterDataUseCaseConfiguration {
     }
 
     @Bean
-    public ActivateArticle activateArticle(ArticleRepository articleRepository) {
-        return new ActivateArticle(articleRepository);
+    public ActivateArticle activateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new ActivateArticle(articleRepository, unitOfWork);
     }
 
     @Bean
-    public DeactivateArticle deactivateArticle(ArticleRepository articleRepository) {
-        return new DeactivateArticle(articleRepository);
+    public DeactivateArticle deactivateArticle(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new DeactivateArticle(articleRepository, unitOfWork);
     }
 
     @Bean
-    public AddSalesUnit addSalesUnit(ArticleRepository articleRepository) {
-        return new AddSalesUnit(articleRepository);
+    public AddSalesUnit addSalesUnit(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new AddSalesUnit(articleRepository, unitOfWork);
     }
 
     @Bean
-    public RemoveSalesUnit removeSalesUnit(ArticleRepository articleRepository) {
-        return new RemoveSalesUnit(articleRepository);
+    public RemoveSalesUnit removeSalesUnit(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new RemoveSalesUnit(articleRepository, unitOfWork);
     }
 
     @Bean
-    public UpdateSalesUnitPrice updateSalesUnitPrice(ArticleRepository articleRepository) {
-        return new UpdateSalesUnitPrice(articleRepository);
+    public UpdateSalesUnitPrice updateSalesUnitPrice(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new UpdateSalesUnitPrice(articleRepository, unitOfWork);
     }
 
     @Bean
-    public AssignSupplier assignSupplier(ArticleRepository articleRepository) {
-        return new AssignSupplier(articleRepository);
+    public AssignSupplier assignSupplier(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new AssignSupplier(articleRepository, unitOfWork);
     }
 
     @Bean
-    public RemoveSupplier removeSupplier(ArticleRepository articleRepository) {
-        return new RemoveSupplier(articleRepository);
+    public RemoveSupplier removeSupplier(ArticleRepository articleRepository, UnitOfWork unitOfWork) {
+        return new RemoveSupplier(articleRepository, unitOfWork);
     }
 
     // ==================== ProductCategory Use Cases ====================
 
     @Bean
-    public CreateProductCategory createProductCategory(ProductCategoryRepository categoryRepository) {
-        return new CreateProductCategory(categoryRepository);
+    public CreateProductCategory createProductCategory(ProductCategoryRepository categoryRepository, UnitOfWork unitOfWork) {
+        return new CreateProductCategory(categoryRepository, unitOfWork);
     }
 
     @Bean
-    public UpdateProductCategory updateProductCategory(ProductCategoryRepository categoryRepository) {
-        return new UpdateProductCategory(categoryRepository);
+    public UpdateProductCategory updateProductCategory(ProductCategoryRepository categoryRepository, UnitOfWork unitOfWork) {
+        return new UpdateProductCategory(categoryRepository, unitOfWork);
     }
 
     @Bean
@@ -88,21 +89,22 @@ public class MasterDataUseCaseConfiguration {
     @Bean
     public DeleteProductCategory deleteProductCategory(
             ProductCategoryRepository categoryRepository,
-            ArticleRepository articleRepository
+            ArticleRepository articleRepository,
+            UnitOfWork unitOfWork
     ) {
-        return new DeleteProductCategory(categoryRepository, articleRepository);
+        return new DeleteProductCategory(categoryRepository, articleRepository, unitOfWork);
     }
 
     // ==================== Supplier Use Cases ====================
 
     @Bean
-    public CreateSupplier createSupplier(SupplierRepository supplierRepository) {
-        return new CreateSupplier(supplierRepository);
+    public CreateSupplier createSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new CreateSupplier(supplierRepository, unitOfWork);
     }
 
     @Bean
-    public UpdateSupplier updateSupplier(SupplierRepository supplierRepository) {
-        return new UpdateSupplier(supplierRepository);
+    public UpdateSupplier updateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new UpdateSupplier(supplierRepository, unitOfWork);
     }
 
     @Bean
@@ -116,40 +118,40 @@ public class MasterDataUseCaseConfiguration {
     }
 
     @Bean
-    public ActivateSupplier activateSupplier(SupplierRepository supplierRepository) {
-        return new ActivateSupplier(supplierRepository);
+    public ActivateSupplier activateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new ActivateSupplier(supplierRepository, unitOfWork);
     }
 
     @Bean
-    public DeactivateSupplier deactivateSupplier(SupplierRepository supplierRepository) {
-        return new DeactivateSupplier(supplierRepository);
+    public DeactivateSupplier deactivateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new DeactivateSupplier(supplierRepository, unitOfWork);
     }
 
     @Bean
-    public RateSupplier rateSupplier(SupplierRepository supplierRepository) {
-        return new RateSupplier(supplierRepository);
+    public RateSupplier rateSupplier(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new RateSupplier(supplierRepository, unitOfWork);
     }
 
     @Bean
-    public AddCertificate addCertificate(SupplierRepository supplierRepository) {
-        return new AddCertificate(supplierRepository);
+    public AddCertificate addCertificate(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new AddCertificate(supplierRepository, unitOfWork);
     }
 
     @Bean
-    public RemoveCertificate removeCertificate(SupplierRepository supplierRepository) {
-        return new RemoveCertificate(supplierRepository);
+    public RemoveCertificate removeCertificate(SupplierRepository supplierRepository, UnitOfWork unitOfWork) {
+        return new RemoveCertificate(supplierRepository, unitOfWork);
     }
 
     // ==================== Customer Use Cases ====================
 
     @Bean
-    public CreateCustomer createCustomer(CustomerRepository customerRepository) {
-        return new CreateCustomer(customerRepository);
+    public CreateCustomer createCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new CreateCustomer(customerRepository, unitOfWork);
     }
 
     @Bean
-    public UpdateCustomer updateCustomer(CustomerRepository customerRepository) {
-        return new UpdateCustomer(customerRepository);
+    public UpdateCustomer updateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new UpdateCustomer(customerRepository, unitOfWork);
     }
 
     @Bean
@@ -163,37 +165,37 @@ public class MasterDataUseCaseConfiguration {
     }
 
     @Bean
-    public ActivateCustomer activateCustomer(CustomerRepository customerRepository) {
-        return new ActivateCustomer(customerRepository);
+    public ActivateCustomer activateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new ActivateCustomer(customerRepository, unitOfWork);
     }
 
     @Bean
-    public DeactivateCustomer deactivateCustomer(CustomerRepository customerRepository) {
-        return new DeactivateCustomer(customerRepository);
+    public DeactivateCustomer deactivateCustomer(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new DeactivateCustomer(customerRepository, unitOfWork);
     }
 
     @Bean
-    public AddDeliveryAddress addDeliveryAddress(CustomerRepository customerRepository) {
-        return new AddDeliveryAddress(customerRepository);
+    public AddDeliveryAddress addDeliveryAddress(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new AddDeliveryAddress(customerRepository, unitOfWork);
     }
 
     @Bean
-    public RemoveDeliveryAddress removeDeliveryAddress(CustomerRepository customerRepository) {
-        return new RemoveDeliveryAddress(customerRepository);
+    public RemoveDeliveryAddress removeDeliveryAddress(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new RemoveDeliveryAddress(customerRepository, unitOfWork);
     }
 
     @Bean
-    public SetFrameContract setFrameContract(CustomerRepository customerRepository) {
-        return new SetFrameContract(customerRepository);
+    public SetFrameContract setFrameContract(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new SetFrameContract(customerRepository, unitOfWork);
     }
 
     @Bean
-    public RemoveFrameContract removeFrameContract(CustomerRepository customerRepository) {
-        return new RemoveFrameContract(customerRepository);
+    public RemoveFrameContract removeFrameContract(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new RemoveFrameContract(customerRepository, unitOfWork);
     }
 
     @Bean
-    public SetPreferences setPreferences(CustomerRepository customerRepository) {
-        return new SetPreferences(customerRepository);
+    public SetPreferences setPreferences(CustomerRepository customerRepository, UnitOfWork unitOfWork) {
+        return new SetPreferences(customerRepository, unitOfWork);
     }
 }

backend/src/main/java/de/effigenix/infrastructure/config/UseCaseConfiguration.java

@@ -3,6 +3,7 @@ package de.effigenix.infrastructure.config;
 import de.effigenix.application.usermanagement.*;
 import de.effigenix.domain.usermanagement.RoleRepository;
 import de.effigenix.domain.usermanagement.UserRepository;
+import de.effigenix.shared.persistence.UnitOfWork;
 import de.effigenix.shared.security.AuthorizationPort;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -22,9 +23,10 @@ public class UseCaseConfiguration {
             RoleRepository roleRepository,
             PasswordHasher passwordHasher,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new CreateUser(userRepository, roleRepository, passwordHasher, auditLogger, authPort);
+        return new CreateUser(userRepository, roleRepository, passwordHasher, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
@@ -32,9 +34,10 @@ public class UseCaseConfiguration {
             UserRepository userRepository,
             PasswordHasher passwordHasher,
             SessionManager sessionManager,
-            AuditLogger auditLogger
+            AuditLogger auditLogger,
+            UnitOfWork unitOfWork
     ) {
-        return new AuthenticateUser(userRepository, passwordHasher, sessionManager, auditLogger);
+        return new AuthenticateUser(userRepository, passwordHasher, sessionManager, auditLogger, unitOfWork);
     }
 
     @Bean
@@ -42,18 +45,20 @@ public class UseCaseConfiguration {
             UserRepository userRepository,
             PasswordHasher passwordHasher,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new ChangePassword(userRepository, passwordHasher, auditLogger, authPort);
+        return new ChangePassword(userRepository, passwordHasher, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
     public UpdateUser updateUser(
             UserRepository userRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new UpdateUser(userRepository, auditLogger, authPort);
+        return new UpdateUser(userRepository, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
@@ -61,9 +66,10 @@ public class UseCaseConfiguration {
             UserRepository userRepository,
             RoleRepository roleRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new AssignRole(userRepository, roleRepository, auditLogger, authPort);
+        return new AssignRole(userRepository, roleRepository, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
@@ -71,27 +77,30 @@ public class UseCaseConfiguration {
             UserRepository userRepository,
             RoleRepository roleRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new RemoveRole(userRepository, roleRepository, auditLogger, authPort);
+        return new RemoveRole(userRepository, roleRepository, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
     public LockUser lockUser(
             UserRepository userRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new LockUser(userRepository, auditLogger, authPort);
+        return new LockUser(userRepository, auditLogger, authPort, unitOfWork);
     }
 
     @Bean
     public UnlockUser unlockUser(
             UserRepository userRepository,
             AuditLogger auditLogger,
-            AuthorizationPort authPort
+            AuthorizationPort authPort,
+            UnitOfWork unitOfWork
     ) {
-        return new UnlockUser(userRepository, auditLogger, authPort);
+        return new UnlockUser(userRepository, auditLogger, authPort, unitOfWork);
     }
 
     @Bean

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/JdbcArticleRepository.java

@@ -0,0 +1,239 @@
+package de.effigenix.infrastructure.masterdata.persistence;
+
+import de.effigenix.domain.masterdata.*;
+import de.effigenix.shared.common.Money;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.OffsetDateTime;
+import java.util.*;
+
+@Repository
+@Profile("!no-db")
+public class JdbcArticleRepository implements ArticleRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcArticleRepository.class);
+
+    private final JdbcClient jdbc;
+
+    public JdbcArticleRepository(JdbcClient jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Article>> findById(ArticleId id) {
+        try {
+            var articleOpt = jdbc.sql("SELECT * FROM articles WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapArticleRow)
+                    .optional();
+            if (articleOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadChildren(articleOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findAll() {
+        try {
+            var articles = jdbc.sql("SELECT * FROM articles ORDER BY name")
+                    .query(this::mapArticleRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(articles);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findByCategory(ProductCategoryId categoryId) {
+        try {
+            var articles = jdbc.sql("SELECT * FROM articles WHERE category_id = :categoryId ORDER BY name")
+                    .param("categoryId", categoryId.value())
+                    .query(this::mapArticleRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(articles);
+        } catch (Exception e) {
+            logger.trace("Database error in findByCategory", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findByStatus(ArticleStatus status) {
+        try {
+            var articles = jdbc.sql("SELECT * FROM articles WHERE status = :status ORDER BY name")
+                    .param("status", status.name())
+                    .query(this::mapArticleRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(articles);
+        } catch (Exception e) {
+            logger.trace("Database error in findByStatus", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Article article) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE articles
+                    SET name = :name, article_number = :articleNumber, category_id = :categoryId,
+                        status = :status, updated_at = :updatedAt
+                    WHERE id = :id
+                    """)
+                    .param("id", article.id().value())
+                    .param("name", article.name().value())
+                    .param("articleNumber", article.articleNumber().value())
+                    .param("categoryId", article.categoryId().value())
+                    .param("status", article.status().name())
+                    .param("updatedAt", article.updatedAt())
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO articles (id, name, article_number, category_id, status, created_at, updated_at)
+                        VALUES (:id, :name, :articleNumber, :categoryId, :status, :createdAt, :updatedAt)
+                        """)
+                        .param("id", article.id().value())
+                        .param("name", article.name().value())
+                        .param("articleNumber", article.articleNumber().value())
+                        .param("categoryId", article.categoryId().value())
+                        .param("status", article.status().name())
+                        .param("createdAt", article.createdAt())
+                        .param("updatedAt", article.updatedAt())
+                        .update();
+            }
+
+            saveSalesUnits(article);
+            saveSupplierReferences(article);
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Article article) {
+        try {
+            jdbc.sql("DELETE FROM articles WHERE id = :id")
+                    .param("id", article.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByArticleNumber(ArticleNumber articleNumber) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM articles WHERE article_number = :articleNumber")
+                    .param("articleNumber", articleNumber.value())
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByArticleNumber", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private void saveSalesUnits(Article article) {
+        jdbc.sql("DELETE FROM sales_units WHERE article_id = :articleId")
+                .param("articleId", article.id().value())
+                .update();
+
+        for (SalesUnit su : article.salesUnits()) {
+            jdbc.sql("""
+                    INSERT INTO sales_units (id, article_id, unit, price_model, price_amount, price_currency)
+                    VALUES (:id, :articleId, :unit, :priceModel, :priceAmount, :priceCurrency)
+                    """)
+                    .param("id", su.id().value())
+                    .param("articleId", article.id().value())
+                    .param("unit", su.unit().name())
+                    .param("priceModel", su.priceModel().name())
+                    .param("priceAmount", su.price().amount())
+                    .param("priceCurrency", su.price().currency().getCurrencyCode())
+                    .update();
+        }
+    }
+
+    private void saveSupplierReferences(Article article) {
+        jdbc.sql("DELETE FROM article_suppliers WHERE article_id = :articleId")
+                .param("articleId", article.id().value())
+                .update();
+
+        for (SupplierId supplierId : article.supplierReferences()) {
+            jdbc.sql("INSERT INTO article_suppliers (article_id, supplier_id) VALUES (:articleId, :supplierId)")
+                    .param("articleId", article.id().value())
+                    .param("supplierId", supplierId.value())
+                    .update();
+        }
+    }
+
+    private Article loadChildren(Article article) {
+        var salesUnits = jdbc.sql("SELECT * FROM sales_units WHERE article_id = :articleId")
+                .param("articleId", article.id().value())
+                .query(this::mapSalesUnitRow)
+                .list();
+
+        var supplierIds = jdbc.sql("SELECT supplier_id FROM article_suppliers WHERE article_id = :articleId")
+                .param("articleId", article.id().value())
+                .query((rs, rowNum) -> SupplierId.of(rs.getString("supplier_id")))
+                .set();
+
+        return Article.reconstitute(
+                article.id(), article.name(), article.articleNumber(), article.categoryId(),
+                salesUnits, article.status(), supplierIds, article.createdAt(), article.updatedAt()
+        );
+    }
+
+    private Article mapArticleRow(ResultSet rs, int rowNum) throws SQLException {
+        return Article.reconstitute(
+                ArticleId.of(rs.getString("id")),
+                new ArticleName(rs.getString("name")),
+                new ArticleNumber(rs.getString("article_number")),
+                ProductCategoryId.of(rs.getString("category_id")),
+                List.of(),
+                ArticleStatus.valueOf(rs.getString("status")),
+                Set.of(),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("updated_at", OffsetDateTime.class)
+        );
+    }
+
+    private SalesUnit mapSalesUnitRow(ResultSet rs, int rowNum) throws SQLException {
+        return SalesUnit.reconstitute(
+                SalesUnitId.of(rs.getString("id")),
+                Unit.valueOf(rs.getString("unit")),
+                PriceModel.valueOf(rs.getString("price_model")),
+                new Money(rs.getBigDecimal("price_amount"),
+                        java.util.Currency.getInstance(rs.getString("price_currency")))
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/JdbcCustomerRepository.java

@@ -0,0 +1,382 @@
+package de.effigenix.infrastructure.masterdata.persistence;
+
+import de.effigenix.domain.masterdata.*;
+import de.effigenix.shared.common.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.math.BigDecimal;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.util.*;
+
+@Repository
+@Profile("!no-db")
+public class JdbcCustomerRepository implements CustomerRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcCustomerRepository.class);
+
+    private final JdbcClient jdbc;
+
+    public JdbcCustomerRepository(JdbcClient jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Customer>> findById(CustomerId id) {
+        try {
+            var customerOpt = jdbc.sql("SELECT * FROM customers WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapCustomerRow)
+                    .optional();
+            if (customerOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadChildren(customerOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findAll() {
+        try {
+            var customers = jdbc.sql("SELECT * FROM customers ORDER BY name")
+                    .query(this::mapCustomerRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(customers);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findByType(CustomerType type) {
+        try {
+            var customers = jdbc.sql("SELECT * FROM customers WHERE type = :type ORDER BY name")
+                    .param("type", type.name())
+                    .query(this::mapCustomerRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(customers);
+        } catch (Exception e) {
+            logger.trace("Database error in findByType", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findByStatus(CustomerStatus status) {
+        try {
+            var customers = jdbc.sql("SELECT * FROM customers WHERE status = :status ORDER BY name")
+                    .param("status", status.name())
+                    .query(this::mapCustomerRow)
+                    .list()
+                    .stream()
+                    .map(this::loadChildren)
+                    .toList();
+            return Result.success(customers);
+        } catch (Exception e) {
+            logger.trace("Database error in findByStatus", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Customer customer) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE customers
+                    SET name = :name, type = :type, phone = :phone, email = :email,
+                        contact_person = :contactPerson,
+                        billing_street = :billingStreet, billing_house_number = :billingHouseNumber,
+                        billing_postal_code = :billingPostalCode, billing_city = :billingCity,
+                        billing_country = :billingCountry,
+                        payment_due_days = :paymentDueDays, payment_description = :paymentDescription,
+                        status = :status, updated_at = :updatedAt
+                    WHERE id = :id
+                    """)
+                    .param("id", customer.id().value())
+                    .params(customerParams(customer))
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO customers
+                        (id, name, type, phone, email, contact_person,
+                         billing_street, billing_house_number, billing_postal_code, billing_city, billing_country,
+                         payment_due_days, payment_description, status, created_at, updated_at)
+                        VALUES (:id, :name, :type, :phone, :email, :contactPerson,
+                                :billingStreet, :billingHouseNumber, :billingPostalCode, :billingCity, :billingCountry,
+                                :paymentDueDays, :paymentDescription, :status, :createdAt, :updatedAt)
+                        """)
+                        .param("id", customer.id().value())
+                        .param("createdAt", customer.createdAt())
+                        .params(customerParams(customer))
+                        .update();
+            }
+
+            saveDeliveryAddresses(customer);
+            savePreferences(customer);
+            saveFrameContract(customer);
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Customer customer) {
+        try {
+            jdbc.sql("DELETE FROM frame_contracts WHERE customer_id = :customerId")
+                    .param("customerId", customer.id().value())
+                    .update();
+            jdbc.sql("DELETE FROM customers WHERE id = :id")
+                    .param("id", customer.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(CustomerName name) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM customers WHERE name = :name")
+                    .param("name", name.value())
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByName", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private Map<String, Object> customerParams(Customer customer) {
+        var params = new LinkedHashMap<String, Object>();
+        params.put("name", customer.name().value());
+        params.put("type", customer.type().name());
+        params.put("phone", customer.contactInfo() != null ? customer.contactInfo().phone() : null);
+        params.put("email", customer.contactInfo() != null ? customer.contactInfo().email() : null);
+        params.put("contactPerson", customer.contactInfo() != null ? customer.contactInfo().contactPerson() : null);
+        params.put("billingStreet", customer.billingAddress().street());
+        params.put("billingHouseNumber", customer.billingAddress().houseNumber());
+        params.put("billingPostalCode", customer.billingAddress().postalCode());
+        params.put("billingCity", customer.billingAddress().city());
+        params.put("billingCountry", customer.billingAddress().country());
+        params.put("paymentDueDays", customer.paymentTerms() != null ? customer.paymentTerms().paymentDueDays() : null);
+        params.put("paymentDescription", customer.paymentTerms() != null ? customer.paymentTerms().description() : null);
+        params.put("status", customer.status().name());
+        params.put("updatedAt", customer.updatedAt());
+        return params;
+    }
+
+    private void saveDeliveryAddresses(Customer customer) {
+        jdbc.sql("DELETE FROM delivery_addresses WHERE customer_id = :customerId")
+                .param("customerId", customer.id().value())
+                .update();
+
+        for (DeliveryAddress da : customer.deliveryAddresses()) {
+            jdbc.sql("""
+                    INSERT INTO delivery_addresses
+                    (customer_id, label, street, house_number, postal_code, city, country, contact_person, delivery_notes)
+                    VALUES (:customerId, :label, :street, :houseNumber, :postalCode, :city, :country, :contactPerson, :deliveryNotes)
+                    """)
+                    .param("customerId", customer.id().value())
+                    .param("label", da.label())
+                    .param("street", da.address().street())
+                    .param("houseNumber", da.address().houseNumber())
+                    .param("postalCode", da.address().postalCode())
+                    .param("city", da.address().city())
+                    .param("country", da.address().country())
+                    .param("contactPerson", da.contactPerson())
+                    .param("deliveryNotes", da.deliveryNotes())
+                    .update();
+        }
+    }
+
+    private void savePreferences(Customer customer) {
+        jdbc.sql("DELETE FROM customer_preferences WHERE customer_id = :customerId")
+                .param("customerId", customer.id().value())
+                .update();
+
+        for (CustomerPreference pref : customer.preferences()) {
+            jdbc.sql("INSERT INTO customer_preferences (customer_id, preference) VALUES (:customerId, :preference)")
+                    .param("customerId", customer.id().value())
+                    .param("preference", pref.name())
+                    .update();
+        }
+    }
+
+    private void saveFrameContract(Customer customer) {
+        jdbc.sql("DELETE FROM frame_contracts WHERE customer_id = :customerId")
+                .param("customerId", customer.id().value())
+                .update();
+
+        if (customer.frameContract() != null) {
+            var fc = customer.frameContract();
+            jdbc.sql("""
+                    INSERT INTO frame_contracts (id, customer_id, valid_from, valid_until, delivery_rhythm)
+                    VALUES (:id, :customerId, :validFrom, :validUntil, :deliveryRhythm)
+                    """)
+                    .param("id", fc.id().value())
+                    .param("customerId", customer.id().value())
+                    .param("validFrom", fc.validFrom())
+                    .param("validUntil", fc.validUntil())
+                    .param("deliveryRhythm", fc.deliveryRhythm().name())
+                    .update();
+
+            saveContractLineItems(fc);
+        }
+    }
+
+    private void saveContractLineItems(FrameContract fc) {
+        jdbc.sql("DELETE FROM contract_line_items WHERE frame_contract_id = :fcId")
+                .param("fcId", fc.id().value())
+                .update();
+
+        for (ContractLineItem item : fc.lineItems()) {
+            jdbc.sql("""
+                    INSERT INTO contract_line_items
+                    (frame_contract_id, article_id, agreed_price_amount, agreed_price_currency, agreed_quantity, unit)
+                    VALUES (:fcId, :articleId, :priceAmount, :priceCurrency, :quantity, :unit)
+                    """)
+                    .param("fcId", fc.id().value())
+                    .param("articleId", item.articleId().value())
+                    .param("priceAmount", item.agreedPrice().amount())
+                    .param("priceCurrency", item.agreedPrice().currency().getCurrencyCode())
+                    .param("quantity", item.agreedQuantity())
+                    .param("unit", item.unit() != null ? item.unit().name() : null)
+                    .update();
+        }
+    }
+
+    private Customer loadChildren(Customer customer) {
+        var deliveryAddresses = jdbc.sql(
+                        "SELECT * FROM delivery_addresses WHERE customer_id = :customerId")
+                .param("customerId", customer.id().value())
+                .query(this::mapDeliveryAddressRow)
+                .list();
+
+        var preferences = jdbc.sql(
+                        "SELECT preference FROM customer_preferences WHERE customer_id = :customerId")
+                .param("customerId", customer.id().value())
+                .query((rs, rowNum) -> CustomerPreference.valueOf(rs.getString("preference")))
+                .set();
+
+        FrameContract frameContract = loadFrameContract(customer.id().value());
+
+        return Customer.reconstitute(
+                customer.id(), customer.name(), customer.type(), customer.billingAddress(),
+                customer.contactInfo(), customer.paymentTerms(), deliveryAddresses,
+                frameContract, preferences, customer.status(), customer.createdAt(), customer.updatedAt()
+        );
+    }
+
+    private FrameContract loadFrameContract(String customerId) {
+        var fcOpt = jdbc.sql("SELECT * FROM frame_contracts WHERE customer_id = :customerId")
+                .param("customerId", customerId)
+                .query(this::mapFrameContractRow)
+                .optional();
+
+        if (fcOpt.isEmpty()) {
+            return null;
+        }
+
+        var fc = fcOpt.get();
+        var lineItems = jdbc.sql(
+                        "SELECT * FROM contract_line_items WHERE frame_contract_id = :fcId")
+                .param("fcId", fc.id().value())
+                .query(this::mapContractLineItemRow)
+                .list();
+
+        return FrameContract.reconstitute(fc.id(), fc.validFrom(), fc.validUntil(),
+                fc.deliveryRhythm(), lineItems);
+    }
+
+    private Customer mapCustomerRow(ResultSet rs, int rowNum) throws SQLException {
+        Address billingAddress = new Address(
+                rs.getString("billing_street"),
+                rs.getString("billing_house_number"),
+                rs.getString("billing_postal_code"),
+                rs.getString("billing_city"),
+                rs.getString("billing_country")
+        );
+
+        ContactInfo contactInfo = new ContactInfo(
+                rs.getString("phone"), rs.getString("email"), rs.getString("contact_person"));
+
+        PaymentTerms paymentTerms = null;
+        Integer dueDays = rs.getObject("payment_due_days", Integer.class);
+        if (dueDays != null) {
+            paymentTerms = new PaymentTerms(dueDays, rs.getString("payment_description"));
+        }
+
+        return Customer.reconstitute(
+                CustomerId.of(rs.getString("id")),
+                new CustomerName(rs.getString("name")),
+                CustomerType.valueOf(rs.getString("type")),
+                billingAddress,
+                contactInfo,
+                paymentTerms,
+                List.of(),
+                null,
+                Set.of(),
+                CustomerStatus.valueOf(rs.getString("status")),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("updated_at", OffsetDateTime.class)
+        );
+    }
+
+    private DeliveryAddress mapDeliveryAddressRow(ResultSet rs, int rowNum) throws SQLException {
+        Address address = new Address(
+                rs.getString("street"),
+                rs.getString("house_number"),
+                rs.getString("postal_code"),
+                rs.getString("city"),
+                rs.getString("country")
+        );
+        return new DeliveryAddress(
+                rs.getString("label"), address,
+                rs.getString("contact_person"), rs.getString("delivery_notes")
+        );
+    }
+
+    private FrameContract mapFrameContractRow(ResultSet rs, int rowNum) throws SQLException {
+        return FrameContract.reconstitute(
+                FrameContractId.of(rs.getString("id")),
+                rs.getObject("valid_from", LocalDate.class),
+                rs.getObject("valid_until", LocalDate.class),
+                DeliveryRhythm.valueOf(rs.getString("delivery_rhythm")),
+                List.of()
+        );
+    }
+
+    private ContractLineItem mapContractLineItemRow(ResultSet rs, int rowNum) throws SQLException {
+        String unitStr = rs.getString("unit");
+        return new ContractLineItem(
+                ArticleId.of(rs.getString("article_id")),
+                new Money(rs.getBigDecimal("agreed_price_amount"),
+                        Currency.getInstance(rs.getString("agreed_price_currency"))),
+                rs.getObject("agreed_quantity", BigDecimal.class),
+                unitStr != null ? Unit.valueOf(unitStr) : null
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/JdbcProductCategoryRepository.java

@@ -0,0 +1,120 @@
+package de.effigenix.infrastructure.masterdata.persistence;
+
+import de.effigenix.domain.masterdata.*;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("!no-db")
+public class JdbcProductCategoryRepository implements ProductCategoryRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcProductCategoryRepository.class);
+
+    private final JdbcClient jdbc;
+
+    public JdbcProductCategoryRepository(JdbcClient jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<ProductCategory>> findById(ProductCategoryId id) {
+        try {
+            var result = jdbc.sql("SELECT * FROM product_categories WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapRow)
+                    .optional();
+            return Result.success(result);
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<ProductCategory>> findAll() {
+        try {
+            var result = jdbc.sql("SELECT * FROM product_categories ORDER BY name")
+                    .query(this::mapRow)
+                    .list();
+            return Result.success(result);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(ProductCategory category) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE product_categories SET name = :name, description = :description
+                    WHERE id = :id
+                    """)
+                    .param("id", category.id().value())
+                    .param("name", category.name().value())
+                    .param("description", category.description())
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO product_categories (id, name, description)
+                        VALUES (:id, :name, :description)
+                        """)
+                        .param("id", category.id().value())
+                        .param("name", category.name().value())
+                        .param("description", category.description())
+                        .update();
+            }
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(ProductCategory category) {
+        try {
+            jdbc.sql("DELETE FROM product_categories WHERE id = :id")
+                    .param("id", category.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(CategoryName name) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM product_categories WHERE name = :name")
+                    .param("name", name.value())
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByName", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private ProductCategory mapRow(ResultSet rs, int rowNum) throws SQLException {
+        return ProductCategory.reconstitute(
+                ProductCategoryId.of(rs.getString("id")),
+                new CategoryName(rs.getString("name")),
+                rs.getString("description")
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/JdbcSupplierRepository.java

@@ -0,0 +1,253 @@
+package de.effigenix.infrastructure.masterdata.persistence;
+
+import de.effigenix.domain.masterdata.*;
+import de.effigenix.shared.common.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("!no-db")
+public class JdbcSupplierRepository implements SupplierRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcSupplierRepository.class);
+
+    private final JdbcClient jdbc;
+
+    public JdbcSupplierRepository(JdbcClient jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Supplier>> findById(SupplierId id) {
+        try {
+            var supplierOpt = jdbc.sql("SELECT * FROM suppliers WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapSupplierRow)
+                    .optional();
+            if (supplierOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadCertificates(supplierOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Supplier>> findAll() {
+        try {
+            var suppliers = jdbc.sql("SELECT * FROM suppliers ORDER BY name")
+                    .query(this::mapSupplierRow)
+                    .list()
+                    .stream()
+                    .map(this::loadCertificates)
+                    .toList();
+            return Result.success(suppliers);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Supplier>> findByStatus(SupplierStatus status) {
+        try {
+            var suppliers = jdbc.sql("SELECT * FROM suppliers WHERE status = :status ORDER BY name")
+                    .param("status", status.name())
+                    .query(this::mapSupplierRow)
+                    .list()
+                    .stream()
+                    .map(this::loadCertificates)
+                    .toList();
+            return Result.success(suppliers);
+        } catch (Exception e) {
+            logger.trace("Database error in findByStatus", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Supplier supplier) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE suppliers
+                    SET name = :name, phone = :phone, email = :email, contact_person = :contactPerson,
+                        street = :street, house_number = :houseNumber, postal_code = :postalCode,
+                        city = :city, country = :country,
+                        payment_due_days = :paymentDueDays, payment_description = :paymentDescription,
+                        quality_score = :qualityScore, delivery_score = :deliveryScore, price_score = :priceScore,
+                        status = :status, updated_at = :updatedAt
+                    WHERE id = :id
+                    """)
+                    .param("id", supplier.id().value())
+                    .params(supplierParams(supplier))
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO suppliers
+                        (id, name, phone, email, contact_person, street, house_number, postal_code, city, country,
+                         payment_due_days, payment_description, quality_score, delivery_score, price_score,
+                         status, created_at, updated_at)
+                        VALUES (:id, :name, :phone, :email, :contactPerson, :street, :houseNumber, :postalCode,
+                                :city, :country, :paymentDueDays, :paymentDescription,
+                                :qualityScore, :deliveryScore, :priceScore, :status, :createdAt, :updatedAt)
+                        """)
+                        .param("id", supplier.id().value())
+                        .param("createdAt", supplier.createdAt())
+                        .params(supplierParams(supplier))
+                        .update();
+            }
+
+            saveCertificates(supplier);
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Supplier supplier) {
+        try {
+            jdbc.sql("DELETE FROM suppliers WHERE id = :id")
+                    .param("id", supplier.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(SupplierName name) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM suppliers WHERE name = :name")
+                    .param("name", name.value())
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByName", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private java.util.Map<String, Object> supplierParams(Supplier supplier) {
+        var params = new java.util.LinkedHashMap<String, Object>();
+        params.put("name", supplier.name().value());
+        params.put("phone", supplier.contactInfo() != null ? supplier.contactInfo().phone() : null);
+        params.put("email", supplier.contactInfo() != null ? supplier.contactInfo().email() : null);
+        params.put("contactPerson", supplier.contactInfo() != null ? supplier.contactInfo().contactPerson() : null);
+        params.put("street", supplier.address() != null ? supplier.address().street() : null);
+        params.put("houseNumber", supplier.address() != null ? supplier.address().houseNumber() : null);
+        params.put("postalCode", supplier.address() != null ? supplier.address().postalCode() : null);
+        params.put("city", supplier.address() != null ? supplier.address().city() : null);
+        params.put("country", supplier.address() != null ? supplier.address().country() : null);
+        params.put("paymentDueDays", supplier.paymentTerms() != null ? supplier.paymentTerms().paymentDueDays() : null);
+        params.put("paymentDescription", supplier.paymentTerms() != null ? supplier.paymentTerms().description() : null);
+        params.put("qualityScore", supplier.rating() != null ? supplier.rating().qualityScore() : null);
+        params.put("deliveryScore", supplier.rating() != null ? supplier.rating().deliveryScore() : null);
+        params.put("priceScore", supplier.rating() != null ? supplier.rating().priceScore() : null);
+        params.put("status", supplier.status().name());
+        params.put("updatedAt", supplier.updatedAt());
+        return params;
+    }
+
+    private void saveCertificates(Supplier supplier) {
+        jdbc.sql("DELETE FROM quality_certificates WHERE supplier_id = :supplierId")
+                .param("supplierId", supplier.id().value())
+                .update();
+
+        for (QualityCertificate cert : supplier.certificates()) {
+            jdbc.sql("""
+                    INSERT INTO quality_certificates (supplier_id, certificate_type, issuer, valid_from, valid_until)
+                    VALUES (:supplierId, :certificateType, :issuer, :validFrom, :validUntil)
+                    """)
+                    .param("supplierId", supplier.id().value())
+                    .param("certificateType", cert.certificateType())
+                    .param("issuer", cert.issuer())
+                    .param("validFrom", cert.validFrom())
+                    .param("validUntil", cert.validUntil())
+                    .update();
+        }
+    }
+
+    private Supplier loadCertificates(Supplier supplier) {
+        var certificates = jdbc.sql(
+                        "SELECT * FROM quality_certificates WHERE supplier_id = :supplierId")
+                .param("supplierId", supplier.id().value())
+                .query(this::mapCertificateRow)
+                .list();
+
+        return Supplier.reconstitute(
+                supplier.id(), supplier.name(), supplier.address(), supplier.contactInfo(),
+                supplier.paymentTerms(), certificates, supplier.rating(), supplier.status(),
+                supplier.createdAt(), supplier.updatedAt()
+        );
+    }
+
+    private Supplier mapSupplierRow(ResultSet rs, int rowNum) throws SQLException {
+        // Address (optional)
+        Address address = null;
+        String street = rs.getString("street");
+        if (street != null) {
+            address = new Address(street, rs.getString("house_number"),
+                    rs.getString("postal_code"), rs.getString("city"), rs.getString("country"));
+        }
+
+        // ContactInfo
+        ContactInfo contactInfo = new ContactInfo(
+                rs.getString("phone"), rs.getString("email"), rs.getString("contact_person"));
+
+        // PaymentTerms (optional)
+        PaymentTerms paymentTerms = null;
+        Integer dueDays = rs.getObject("payment_due_days", Integer.class);
+        if (dueDays != null) {
+            paymentTerms = new PaymentTerms(dueDays, rs.getString("payment_description"));
+        }
+
+        // SupplierRating (optional)
+        SupplierRating rating = null;
+        Integer qualityScore = rs.getObject("quality_score", Integer.class);
+        if (qualityScore != null) {
+            rating = new SupplierRating(qualityScore,
+                    rs.getInt("delivery_score"), rs.getInt("price_score"));
+        }
+
+        return Supplier.reconstitute(
+                SupplierId.of(rs.getString("id")),
+                new SupplierName(rs.getString("name")),
+                address,
+                contactInfo,
+                paymentTerms,
+                List.of(),
+                rating,
+                SupplierStatus.valueOf(rs.getString("status")),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("updated_at", OffsetDateTime.class)
+        );
+    }
+
+    private QualityCertificate mapCertificateRow(ResultSet rs, int rowNum) throws SQLException {
+        return new QualityCertificate(
+                rs.getString("certificate_type"),
+                rs.getString("issuer"),
+                rs.getObject("valid_from", LocalDate.class),
+                rs.getObject("valid_until", LocalDate.class)
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/ArticleEntity.java

@@ -1,77 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.*;
-
-import java.time.OffsetDateTime;
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-
-@Entity
-@Table(name = "articles")
-public class ArticleEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "name", nullable = false, length = 200)
-    private String name;
-
-    @Column(name = "article_number", nullable = false, unique = true, length = 50)
-    private String articleNumber;
-
-    @Column(name = "category_id", nullable = false, length = 36)
-    private String categoryId;
-
-    @Column(name = "status", nullable = false, length = 20)
-    private String status;
-
-    @Column(name = "created_at", nullable = false, updatable = false)
-    private OffsetDateTime createdAt;
-
-    @Column(name = "updated_at", nullable = false)
-    private OffsetDateTime updatedAt;
-
-    @OneToMany(mappedBy = "article", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
-    private List<SalesUnitEntity> salesUnits = new ArrayList<>();
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "article_suppliers", joinColumns = @JoinColumn(name = "article_id"))
-    @Column(name = "supplier_id")
-    private Set<String> supplierIds = new HashSet<>();
-
-    protected ArticleEntity() {}
-
-    public ArticleEntity(String id, String name, String articleNumber, String categoryId,
-                         String status, OffsetDateTime createdAt, OffsetDateTime updatedAt) {
-        this.id = id;
-        this.name = name;
-        this.articleNumber = articleNumber;
-        this.categoryId = categoryId;
-        this.status = status;
-        this.createdAt = createdAt;
-        this.updatedAt = updatedAt;
-    }
-
-    public String getId() { return id; }
-    public String getName() { return name; }
-    public String getArticleNumber() { return articleNumber; }
-    public String getCategoryId() { return categoryId; }
-    public String getStatus() { return status; }
-    public OffsetDateTime getCreatedAt() { return createdAt; }
-    public OffsetDateTime getUpdatedAt() { return updatedAt; }
-    public List<SalesUnitEntity> getSalesUnits() { return salesUnits; }
-    public Set<String> getSupplierIds() { return supplierIds; }
-
-    public void setId(String id) { this.id = id; }
-    public void setName(String name) { this.name = name; }
-    public void setArticleNumber(String articleNumber) { this.articleNumber = articleNumber; }
-    public void setCategoryId(String categoryId) { this.categoryId = categoryId; }
-    public void setStatus(String status) { this.status = status; }
-    public void setCreatedAt(OffsetDateTime createdAt) { this.createdAt = createdAt; }
-    public void setUpdatedAt(OffsetDateTime updatedAt) { this.updatedAt = updatedAt; }
-    public void setSalesUnits(List<SalesUnitEntity> salesUnits) { this.salesUnits = salesUnits; }
-    public void setSupplierIds(Set<String> supplierIds) { this.supplierIds = supplierIds; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/ContractLineItemEmbeddable.java

@@ -1,42 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Embeddable;
-
-import java.math.BigDecimal;
-
-@Embeddable
-public class ContractLineItemEmbeddable {
-
-    @Column(name = "article_id", nullable = false, length = 36)
-    private String articleId;
-
-    @Column(name = "agreed_price_amount", nullable = false, precision = 19, scale = 2)
-    private BigDecimal agreedPriceAmount;
-
-    @Column(name = "agreed_price_currency", nullable = false, length = 3)
-    private String agreedPriceCurrency;
-
-    @Column(name = "agreed_quantity", precision = 19, scale = 4)
-    private BigDecimal agreedQuantity;
-
-    @Column(name = "unit", length = 30)
-    private String unit;
-
-    protected ContractLineItemEmbeddable() {}
-
-    public ContractLineItemEmbeddable(String articleId, BigDecimal agreedPriceAmount,
-                                      String agreedPriceCurrency, BigDecimal agreedQuantity, String unit) {
-        this.articleId = articleId;
-        this.agreedPriceAmount = agreedPriceAmount;
-        this.agreedPriceCurrency = agreedPriceCurrency;
-        this.agreedQuantity = agreedQuantity;
-        this.unit = unit;
-    }
-
-    public String getArticleId() { return articleId; }
-    public BigDecimal getAgreedPriceAmount() { return agreedPriceAmount; }
-    public String getAgreedPriceCurrency() { return agreedPriceCurrency; }
-    public BigDecimal getAgreedQuantity() { return agreedQuantity; }
-    public String getUnit() { return unit; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/CustomerEntity.java

@@ -1,119 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.*;
-
-import java.time.OffsetDateTime;
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-
-@Entity
-@Table(name = "customers")
-public class CustomerEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "name", nullable = false, unique = true, length = 200)
-    private String name;
-
-    @Column(name = "type", nullable = false, length = 10)
-    private String type;
-
-    @Column(name = "phone", length = 50)
-    private String phone;
-
-    @Column(name = "email", length = 255)
-    private String email;
-
-    @Column(name = "contact_person", length = 200)
-    private String contactPerson;
-
-    @Column(name = "billing_street", nullable = false, length = 200)
-    private String billingStreet;
-
-    @Column(name = "billing_house_number", length = 20)
-    private String billingHouseNumber;
-
-    @Column(name = "billing_postal_code", nullable = false, length = 20)
-    private String billingPostalCode;
-
-    @Column(name = "billing_city", nullable = false, length = 100)
-    private String billingCity;
-
-    @Column(name = "billing_country", nullable = false, length = 2)
-    private String billingCountry;
-
-    @Column(name = "payment_due_days")
-    private Integer paymentDueDays;
-
-    @Column(name = "payment_description", length = 500)
-    private String paymentDescription;
-
-    @Column(name = "status", nullable = false, length = 20)
-    private String status;
-
-    @Column(name = "created_at", nullable = false, updatable = false)
-    private OffsetDateTime createdAt;
-
-    @Column(name = "updated_at", nullable = false)
-    private OffsetDateTime updatedAt;
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "delivery_addresses", joinColumns = @JoinColumn(name = "customer_id"))
-    private List<DeliveryAddressEmbeddable> deliveryAddresses = new ArrayList<>();
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "customer_preferences", joinColumns = @JoinColumn(name = "customer_id"))
-    @Column(name = "preference")
-    @Enumerated(EnumType.STRING)
-    private Set<de.effigenix.domain.masterdata.CustomerPreference> preferences = new HashSet<>();
-
-    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
-    @JoinColumn(name = "id", referencedColumnName = "customer_id", insertable = false, updatable = false)
-    private FrameContractEntity frameContract;
-
-    public CustomerEntity() {}
-
-    public String getId() { return id; }
-    public String getName() { return name; }
-    public String getType() { return type; }
-    public String getPhone() { return phone; }
-    public String getEmail() { return email; }
-    public String getContactPerson() { return contactPerson; }
-    public String getBillingStreet() { return billingStreet; }
-    public String getBillingHouseNumber() { return billingHouseNumber; }
-    public String getBillingPostalCode() { return billingPostalCode; }
-    public String getBillingCity() { return billingCity; }
-    public String getBillingCountry() { return billingCountry; }
-    public Integer getPaymentDueDays() { return paymentDueDays; }
-    public String getPaymentDescription() { return paymentDescription; }
-    public String getStatus() { return status; }
-    public OffsetDateTime getCreatedAt() { return createdAt; }
-    public OffsetDateTime getUpdatedAt() { return updatedAt; }
-    public List<DeliveryAddressEmbeddable> getDeliveryAddresses() { return deliveryAddresses; }
-    public Set<de.effigenix.domain.masterdata.CustomerPreference> getPreferences() { return preferences; }
-    public FrameContractEntity getFrameContract() { return frameContract; }
-
-    public void setId(String id) { this.id = id; }
-    public void setName(String name) { this.name = name; }
-    public void setType(String type) { this.type = type; }
-    public void setPhone(String phone) { this.phone = phone; }
-    public void setEmail(String email) { this.email = email; }
-    public void setContactPerson(String contactPerson) { this.contactPerson = contactPerson; }
-    public void setBillingStreet(String billingStreet) { this.billingStreet = billingStreet; }
-    public void setBillingHouseNumber(String billingHouseNumber) { this.billingHouseNumber = billingHouseNumber; }
-    public void setBillingPostalCode(String billingPostalCode) { this.billingPostalCode = billingPostalCode; }
-    public void setBillingCity(String billingCity) { this.billingCity = billingCity; }
-    public void setBillingCountry(String billingCountry) { this.billingCountry = billingCountry; }
-    public void setPaymentDueDays(Integer paymentDueDays) { this.paymentDueDays = paymentDueDays; }
-    public void setPaymentDescription(String paymentDescription) { this.paymentDescription = paymentDescription; }
-    public void setStatus(String status) { this.status = status; }
-    public void setCreatedAt(OffsetDateTime createdAt) { this.createdAt = createdAt; }
-    public void setUpdatedAt(OffsetDateTime updatedAt) { this.updatedAt = updatedAt; }
-    public void setDeliveryAddresses(List<DeliveryAddressEmbeddable> deliveryAddresses) { this.deliveryAddresses = deliveryAddresses; }
-    public void setPreferences(Set<de.effigenix.domain.masterdata.CustomerPreference> preferences) { this.preferences = preferences; }
-    public void setFrameContract(FrameContractEntity frameContract) { this.frameContract = frameContract; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/DeliveryAddressEmbeddable.java

@@ -1,56 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Embeddable;
-
-@Embeddable
-public class DeliveryAddressEmbeddable {
-
-    @Column(name = "label", length = 100)
-    private String label;
-
-    @Column(name = "street", nullable = false, length = 200)
-    private String street;
-
-    @Column(name = "house_number", length = 20)
-    private String houseNumber;
-
-    @Column(name = "postal_code", nullable = false, length = 20)
-    private String postalCode;
-
-    @Column(name = "city", nullable = false, length = 100)
-    private String city;
-
-    @Column(name = "country", nullable = false, length = 2)
-    private String country;
-
-    @Column(name = "contact_person", length = 200)
-    private String contactPerson;
-
-    @Column(name = "delivery_notes", length = 500)
-    private String deliveryNotes;
-
-    protected DeliveryAddressEmbeddable() {}
-
-    public DeliveryAddressEmbeddable(String label, String street, String houseNumber,
-                                     String postalCode, String city, String country,
-                                     String contactPerson, String deliveryNotes) {
-        this.label = label;
-        this.street = street;
-        this.houseNumber = houseNumber;
-        this.postalCode = postalCode;
-        this.city = city;
-        this.country = country;
-        this.contactPerson = contactPerson;
-        this.deliveryNotes = deliveryNotes;
-    }
-
-    public String getLabel() { return label; }
-    public String getStreet() { return street; }
-    public String getHouseNumber() { return houseNumber; }
-    public String getPostalCode() { return postalCode; }
-    public String getCity() { return city; }
-    public String getCountry() { return country; }
-    public String getContactPerson() { return contactPerson; }
-    public String getDeliveryNotes() { return deliveryNotes; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/FrameContractEntity.java

@@ -1,57 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.*;
-
-import java.time.LocalDate;
-import java.util.ArrayList;
-import java.util.List;
-
-@Entity
-@Table(name = "frame_contracts")
-public class FrameContractEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "customer_id", nullable = false, unique = true, length = 36)
-    private String customerId;
-
-    @Column(name = "valid_from")
-    private LocalDate validFrom;
-
-    @Column(name = "valid_until")
-    private LocalDate validUntil;
-
-    @Column(name = "delivery_rhythm", nullable = false, length = 20)
-    private String deliveryRhythm;
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "contract_line_items", joinColumns = @JoinColumn(name = "frame_contract_id"))
-    private List<ContractLineItemEmbeddable> lineItems = new ArrayList<>();
-
-    protected FrameContractEntity() {}
-
-    public FrameContractEntity(String id, String customerId, LocalDate validFrom,
-                               LocalDate validUntil, String deliveryRhythm) {
-        this.id = id;
-        this.customerId = customerId;
-        this.validFrom = validFrom;
-        this.validUntil = validUntil;
-        this.deliveryRhythm = deliveryRhythm;
-    }
-
-    public String getId() { return id; }
-    public String getCustomerId() { return customerId; }
-    public LocalDate getValidFrom() { return validFrom; }
-    public LocalDate getValidUntil() { return validUntil; }
-    public String getDeliveryRhythm() { return deliveryRhythm; }
-    public List<ContractLineItemEmbeddable> getLineItems() { return lineItems; }
-
-    public void setId(String id) { this.id = id; }
-    public void setCustomerId(String customerId) { this.customerId = customerId; }
-    public void setValidFrom(LocalDate validFrom) { this.validFrom = validFrom; }
-    public void setValidUntil(LocalDate validUntil) { this.validUntil = validUntil; }
-    public void setDeliveryRhythm(String deliveryRhythm) { this.deliveryRhythm = deliveryRhythm; }
-    public void setLineItems(List<ContractLineItemEmbeddable> lineItems) { this.lineItems = lineItems; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/ProductCategoryEntity.java

@@ -1,37 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Entity;
-import jakarta.persistence.Id;
-import jakarta.persistence.Table;
-
-@Entity
-@Table(name = "product_categories")
-public class ProductCategoryEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "name", nullable = false, unique = true, length = 100)
-    private String name;
-
-    @Column(name = "description", columnDefinition = "TEXT")
-    private String description;
-
-    protected ProductCategoryEntity() {}
-
-    public ProductCategoryEntity(String id, String name, String description) {
-        this.id = id;
-        this.name = name;
-        this.description = description;
-    }
-
-    public String getId() { return id; }
-    public String getName() { return name; }
-    public String getDescription() { return description; }
-
-    public void setId(String id) { this.id = id; }
-    public void setName(String name) { this.name = name; }
-    public void setDescription(String description) { this.description = description; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/QualityCertificateEmbeddable.java

@@ -1,41 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.Column;
-import jakarta.persistence.Embeddable;
-
-import java.time.LocalDate;
-
-@Embeddable
-public class QualityCertificateEmbeddable {
-
-    @Column(name = "certificate_type", nullable = false, length = 100)
-    private String certificateType;
-
-    @Column(name = "issuer", length = 200)
-    private String issuer;
-
-    @Column(name = "valid_from")
-    private LocalDate validFrom;
-
-    @Column(name = "valid_until")
-    private LocalDate validUntil;
-
-    protected QualityCertificateEmbeddable() {}
-
-    public QualityCertificateEmbeddable(String certificateType, String issuer, LocalDate validFrom, LocalDate validUntil) {
-        this.certificateType = certificateType;
-        this.issuer = issuer;
-        this.validFrom = validFrom;
-        this.validUntil = validUntil;
-    }
-
-    public String getCertificateType() { return certificateType; }
-    public String getIssuer() { return issuer; }
-    public LocalDate getValidFrom() { return validFrom; }
-    public LocalDate getValidUntil() { return validUntil; }
-
-    public void setCertificateType(String certificateType) { this.certificateType = certificateType; }
-    public void setIssuer(String issuer) { this.issuer = issuer; }
-    public void setValidFrom(LocalDate validFrom) { this.validFrom = validFrom; }
-    public void setValidUntil(LocalDate validUntil) { this.validUntil = validUntil; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/SalesUnitEntity.java

@@ -1,56 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.*;
-
-import java.math.BigDecimal;
-
-@Entity
-@Table(name = "sales_units")
-public class SalesUnitEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "article_id", nullable = false)
-    private ArticleEntity article;
-
-    @Column(name = "unit", nullable = false, length = 30)
-    private String unit;
-
-    @Column(name = "price_model", nullable = false, length = 30)
-    private String priceModel;
-
-    @Column(name = "price_amount", nullable = false, precision = 19, scale = 2)
-    private BigDecimal priceAmount;
-
-    @Column(name = "price_currency", nullable = false, length = 3)
-    private String priceCurrency;
-
-    protected SalesUnitEntity() {}
-
-    public SalesUnitEntity(String id, ArticleEntity article, String unit, String priceModel,
-                           BigDecimal priceAmount, String priceCurrency) {
-        this.id = id;
-        this.article = article;
-        this.unit = unit;
-        this.priceModel = priceModel;
-        this.priceAmount = priceAmount;
-        this.priceCurrency = priceCurrency;
-    }
-
-    public String getId() { return id; }
-    public ArticleEntity getArticle() { return article; }
-    public String getUnit() { return unit; }
-    public String getPriceModel() { return priceModel; }
-    public BigDecimal getPriceAmount() { return priceAmount; }
-    public String getPriceCurrency() { return priceCurrency; }
-
-    public void setId(String id) { this.id = id; }
-    public void setArticle(ArticleEntity article) { this.article = article; }
-    public void setUnit(String unit) { this.unit = unit; }
-    public void setPriceModel(String priceModel) { this.priceModel = priceModel; }
-    public void setPriceAmount(BigDecimal priceAmount) { this.priceAmount = priceAmount; }
-    public void setPriceCurrency(String priceCurrency) { this.priceCurrency = priceCurrency; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/entity/SupplierEntity.java

@@ -1,113 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.entity;
-
-import jakarta.persistence.*;
-
-import java.time.OffsetDateTime;
-import java.util.ArrayList;
-import java.util.List;
-
-@Entity
-@Table(name = "suppliers")
-public class SupplierEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "name", nullable = false, unique = true, length = 200)
-    private String name;
-
-    @Column(name = "phone", length = 50)
-    private String phone;
-
-    @Column(name = "email", length = 255)
-    private String email;
-
-    @Column(name = "contact_person", length = 200)
-    private String contactPerson;
-
-    @Column(name = "street", length = 200)
-    private String street;
-
-    @Column(name = "house_number", length = 20)
-    private String houseNumber;
-
-    @Column(name = "postal_code", length = 20)
-    private String postalCode;
-
-    @Column(name = "city", length = 100)
-    private String city;
-
-    @Column(name = "country", length = 2)
-    private String country;
-
-    @Column(name = "payment_due_days")
-    private Integer paymentDueDays;
-
-    @Column(name = "payment_description", length = 500)
-    private String paymentDescription;
-
-    @Column(name = "quality_score")
-    private Integer qualityScore;
-
-    @Column(name = "delivery_score")
-    private Integer deliveryScore;
-
-    @Column(name = "price_score")
-    private Integer priceScore;
-
-    @Column(name = "status", nullable = false, length = 20)
-    private String status;
-
-    @Column(name = "created_at", nullable = false, updatable = false)
-    private OffsetDateTime createdAt;
-
-    @Column(name = "updated_at", nullable = false)
-    private OffsetDateTime updatedAt;
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "quality_certificates", joinColumns = @JoinColumn(name = "supplier_id"))
-    private List<QualityCertificateEmbeddable> certificates = new ArrayList<>();
-
-    public SupplierEntity() {}
-
-    public String getId() { return id; }
-    public String getName() { return name; }
-    public String getPhone() { return phone; }
-    public String getEmail() { return email; }
-    public String getContactPerson() { return contactPerson; }
-    public String getStreet() { return street; }
-    public String getHouseNumber() { return houseNumber; }
-    public String getPostalCode() { return postalCode; }
-    public String getCity() { return city; }
-    public String getCountry() { return country; }
-    public Integer getPaymentDueDays() { return paymentDueDays; }
-    public String getPaymentDescription() { return paymentDescription; }
-    public Integer getQualityScore() { return qualityScore; }
-    public Integer getDeliveryScore() { return deliveryScore; }
-    public Integer getPriceScore() { return priceScore; }
-    public String getStatus() { return status; }
-    public OffsetDateTime getCreatedAt() { return createdAt; }
-    public OffsetDateTime getUpdatedAt() { return updatedAt; }
-    public List<QualityCertificateEmbeddable> getCertificates() { return certificates; }
-
-    public void setId(String id) { this.id = id; }
-    public void setName(String name) { this.name = name; }
-    public void setPhone(String phone) { this.phone = phone; }
-    public void setEmail(String email) { this.email = email; }
-    public void setContactPerson(String contactPerson) { this.contactPerson = contactPerson; }
-    public void setStreet(String street) { this.street = street; }
-    public void setHouseNumber(String houseNumber) { this.houseNumber = houseNumber; }
-    public void setPostalCode(String postalCode) { this.postalCode = postalCode; }
-    public void setCity(String city) { this.city = city; }
-    public void setCountry(String country) { this.country = country; }
-    public void setPaymentDueDays(Integer paymentDueDays) { this.paymentDueDays = paymentDueDays; }
-    public void setPaymentDescription(String paymentDescription) { this.paymentDescription = paymentDescription; }
-    public void setQualityScore(Integer qualityScore) { this.qualityScore = qualityScore; }
-    public void setDeliveryScore(Integer deliveryScore) { this.deliveryScore = deliveryScore; }
-    public void setPriceScore(Integer priceScore) { this.priceScore = priceScore; }
-    public void setStatus(String status) { this.status = status; }
-    public void setCreatedAt(OffsetDateTime createdAt) { this.createdAt = createdAt; }
-    public void setUpdatedAt(OffsetDateTime updatedAt) { this.updatedAt = updatedAt; }
-    public void setCertificates(List<QualityCertificateEmbeddable> certificates) { this.certificates = certificates; }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/mapper/ArticleMapper.java

@@ -1,83 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.mapper;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.entity.ArticleEntity;
-import de.effigenix.infrastructure.masterdata.persistence.entity.SalesUnitEntity;
-import de.effigenix.shared.common.Money;
-import org.springframework.stereotype.Component;
-
-import java.util.Currency;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-import java.util.stream.Collectors;
-
-@Component
-public class ArticleMapper {
-
-    public ArticleEntity toEntity(Article article) {
-        var entity = new ArticleEntity(
-                article.id().value(),
-                article.name().value(),
-                article.articleNumber().value(),
-                article.categoryId().value(),
-                article.status().name(),
-                article.createdAt(),
-                article.updatedAt()
-        );
-
-        List<SalesUnitEntity> salesUnitEntities = article.salesUnits().stream()
-                .map(su -> toSalesUnitEntity(su, entity))
-                .collect(Collectors.toList());
-        entity.setSalesUnits(salesUnitEntities);
-
-        Set<String> supplierIds = article.supplierReferences().stream()
-                .map(SupplierId::value)
-                .collect(Collectors.toSet());
-        entity.setSupplierIds(supplierIds);
-
-        return entity;
-    }
-
-    public Article toDomain(ArticleEntity entity) {
-        List<SalesUnit> salesUnits = entity.getSalesUnits().stream()
-                .map(this::toDomainSalesUnit)
-                .collect(Collectors.toList());
-
-        Set<SupplierId> supplierRefs = entity.getSupplierIds().stream()
-                .map(SupplierId::of)
-                .collect(Collectors.toSet());
-
-        return Article.reconstitute(
-                ArticleId.of(entity.getId()),
-                new ArticleName(entity.getName()),
-                new ArticleNumber(entity.getArticleNumber()),
-                ProductCategoryId.of(entity.getCategoryId()),
-                salesUnits,
-                ArticleStatus.valueOf(entity.getStatus()),
-                supplierRefs,
-                entity.getCreatedAt(),
-                entity.getUpdatedAt()
-        );
-    }
-
-    private SalesUnitEntity toSalesUnitEntity(SalesUnit su, ArticleEntity article) {
-        return new SalesUnitEntity(
-                su.id().value(),
-                article,
-                su.unit().name(),
-                su.priceModel().name(),
-                su.price().amount(),
-                su.price().currency().getCurrencyCode()
-        );
-    }
-
-    private SalesUnit toDomainSalesUnit(SalesUnitEntity entity) {
-        return SalesUnit.reconstitute(
-                SalesUnitId.of(entity.getId()),
-                Unit.valueOf(entity.getUnit()),
-                PriceModel.valueOf(entity.getPriceModel()),
-                new Money(entity.getPriceAmount(), Currency.getInstance(entity.getPriceCurrency()))
-        );
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/mapper/CustomerMapper.java

@@ -1,138 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.mapper;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.entity.*;
-import de.effigenix.shared.common.Address;
-import de.effigenix.shared.common.ContactInfo;
-import de.effigenix.shared.common.Money;
-import de.effigenix.shared.common.PaymentTerms;
-import org.springframework.stereotype.Component;
-
-import java.util.Currency;
-import java.util.List;
-import java.util.stream.Collectors;
-
-@Component
-public class CustomerMapper {
-
-    public CustomerEntity toEntity(Customer customer) {
-        var entity = new CustomerEntity();
-        entity.setId(customer.id().value());
-        entity.setName(customer.name().value());
-        entity.setType(customer.type().name());
-
-        var contact = customer.contactInfo();
-        if (contact != null) {
-            entity.setPhone(contact.phone());
-            entity.setEmail(contact.email());
-            entity.setContactPerson(contact.contactPerson());
-        }
-
-        var billing = customer.billingAddress();
-        entity.setBillingStreet(billing.street());
-        entity.setBillingHouseNumber(billing.houseNumber());
-        entity.setBillingPostalCode(billing.postalCode());
-        entity.setBillingCity(billing.city());
-        entity.setBillingCountry(billing.country());
-
-        var terms = customer.paymentTerms();
-        if (terms != null) {
-            entity.setPaymentDueDays(terms.paymentDueDays());
-            entity.setPaymentDescription(terms.description());
-        }
-
-        entity.setStatus(customer.status().name());
-        entity.setCreatedAt(customer.createdAt());
-        entity.setUpdatedAt(customer.updatedAt());
-
-        entity.setDeliveryAddresses(customer.deliveryAddresses().stream()
-                .map(da -> new DeliveryAddressEmbeddable(
-                        da.label(),
-                        da.address().street(), da.address().houseNumber(),
-                        da.address().postalCode(), da.address().city(), da.address().country(),
-                        da.contactPerson(), da.deliveryNotes()))
-                .collect(Collectors.toList()));
-
-        entity.setPreferences(customer.preferences());
-
-        // FrameContract is saved separately — not via the @OneToOne mapping
-        // (handled in JpaCustomerRepository)
-
-        return entity;
-    }
-
-    public Customer toDomain(CustomerEntity entity, FrameContractEntity fcEntity) {
-        Address billingAddress = new Address(
-                entity.getBillingStreet(), entity.getBillingHouseNumber(),
-                entity.getBillingPostalCode(), entity.getBillingCity(), entity.getBillingCountry()
-        );
-
-        ContactInfo contactInfo = new ContactInfo(
-                entity.getPhone(), entity.getEmail(), entity.getContactPerson()
-        );
-
-        PaymentTerms paymentTerms = null;
-        if (entity.getPaymentDueDays() != null) {
-            paymentTerms = new PaymentTerms(entity.getPaymentDueDays(), entity.getPaymentDescription());
-        }
-
-        List<DeliveryAddress> deliveryAddresses = entity.getDeliveryAddresses().stream()
-                .map(da -> new DeliveryAddress(
-                        da.getLabel(),
-                        new Address(da.getStreet(), da.getHouseNumber(),
-                                da.getPostalCode(), da.getCity(), da.getCountry()),
-                        da.getContactPerson(), da.getDeliveryNotes()))
-                .collect(Collectors.toList());
-
-        FrameContract frameContract = null;
-        if (fcEntity != null) {
-            List<ContractLineItem> lineItems = fcEntity.getLineItems().stream()
-                    .map(li -> new ContractLineItem(
-                            ArticleId.of(li.getArticleId()),
-                            new Money(li.getAgreedPriceAmount(), Currency.getInstance(li.getAgreedPriceCurrency())),
-                            li.getAgreedQuantity(),
-                            li.getUnit() != null ? Unit.valueOf(li.getUnit()) : null))
-                    .collect(Collectors.toList());
-
-            frameContract = FrameContract.reconstitute(
-                    FrameContractId.of(fcEntity.getId()),
-                    fcEntity.getValidFrom(),
-                    fcEntity.getValidUntil(),
-                    DeliveryRhythm.valueOf(fcEntity.getDeliveryRhythm()),
-                    lineItems
-            );
-        }
-
-        return Customer.reconstitute(
-                CustomerId.of(entity.getId()),
-                new CustomerName(entity.getName()),
-                CustomerType.valueOf(entity.getType()),
-                billingAddress,
-                contactInfo,
-                paymentTerms,
-                deliveryAddresses,
-                frameContract,
-                entity.getPreferences(),
-                CustomerStatus.valueOf(entity.getStatus()),
-                entity.getCreatedAt(),
-                entity.getUpdatedAt()
-        );
-    }
-
-    public FrameContractEntity toFrameContractEntity(FrameContract fc, String customerId) {
-        var entity = new FrameContractEntity(
-                fc.id().value(), customerId,
-                fc.validFrom(), fc.validUntil(),
-                fc.deliveryRhythm().name()
-        );
-        entity.setLineItems(fc.lineItems().stream()
-                .map(li -> new ContractLineItemEmbeddable(
-                        li.articleId().value(),
-                        li.agreedPrice().amount(),
-                        li.agreedPrice().currency().getCurrencyCode(),
-                        li.agreedQuantity(),
-                        li.unit() != null ? li.unit().name() : null))
-                .collect(Collectors.toList()));
-        return entity;
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/mapper/ProductCategoryMapper.java

@@ -1,27 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.mapper;
-
-import de.effigenix.domain.masterdata.CategoryName;
-import de.effigenix.domain.masterdata.ProductCategory;
-import de.effigenix.domain.masterdata.ProductCategoryId;
-import de.effigenix.infrastructure.masterdata.persistence.entity.ProductCategoryEntity;
-import org.springframework.stereotype.Component;
-
-@Component
-public class ProductCategoryMapper {
-
-    public ProductCategoryEntity toEntity(ProductCategory category) {
-        return new ProductCategoryEntity(
-                category.id().value(),
-                category.name().value(),
-                category.description()
-        );
-    }
-
-    public ProductCategory toDomain(ProductCategoryEntity entity) {
-        return ProductCategory.reconstitute(
-                ProductCategoryId.of(entity.getId()),
-                new CategoryName(entity.getName()),
-                entity.getDescription()
-        );
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/mapper/SupplierMapper.java

@@ -1,107 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.mapper;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.entity.QualityCertificateEmbeddable;
-import de.effigenix.infrastructure.masterdata.persistence.entity.SupplierEntity;
-import de.effigenix.shared.common.Address;
-import de.effigenix.shared.common.ContactInfo;
-import de.effigenix.shared.common.PaymentTerms;
-import org.springframework.stereotype.Component;
-
-import java.util.List;
-import java.util.stream.Collectors;
-
-@Component
-public class SupplierMapper {
-
-    public SupplierEntity toEntity(Supplier supplier) {
-        var entity = new SupplierEntity();
-        entity.setId(supplier.id().value());
-        entity.setName(supplier.name().value());
-
-        var contact = supplier.contactInfo();
-        if (contact != null) {
-            entity.setPhone(contact.phone());
-            entity.setEmail(contact.email());
-            entity.setContactPerson(contact.contactPerson());
-        }
-
-        var address = supplier.address();
-        if (address != null) {
-            entity.setStreet(address.street());
-            entity.setHouseNumber(address.houseNumber());
-            entity.setPostalCode(address.postalCode());
-            entity.setCity(address.city());
-            entity.setCountry(address.country());
-        }
-
-        var terms = supplier.paymentTerms();
-        if (terms != null) {
-            entity.setPaymentDueDays(terms.paymentDueDays());
-            entity.setPaymentDescription(terms.description());
-        }
-
-        var rating = supplier.rating();
-        if (rating != null) {
-            entity.setQualityScore(rating.qualityScore());
-            entity.setDeliveryScore(rating.deliveryScore());
-            entity.setPriceScore(rating.priceScore());
-        }
-
-        entity.setStatus(supplier.status().name());
-        entity.setCreatedAt(supplier.createdAt());
-        entity.setUpdatedAt(supplier.updatedAt());
-
-        List<QualityCertificateEmbeddable> certs = supplier.certificates().stream()
-                .map(c -> new QualityCertificateEmbeddable(
-                        c.certificateType(), c.issuer(), c.validFrom(), c.validUntil()))
-                .collect(Collectors.toList());
-        entity.setCertificates(certs);
-
-        return entity;
-    }
-
-    public Supplier toDomain(SupplierEntity entity) {
-        Address address = null;
-        if (entity.getStreet() != null) {
-            address = new Address(
-                    entity.getStreet(), entity.getHouseNumber(),
-                    entity.getPostalCode(), entity.getCity(), entity.getCountry()
-            );
-        }
-
-        ContactInfo contactInfo = new ContactInfo(
-                entity.getPhone(), entity.getEmail(), entity.getContactPerson()
-        );
-
-        PaymentTerms paymentTerms = null;
-        if (entity.getPaymentDueDays() != null) {
-            paymentTerms = new PaymentTerms(entity.getPaymentDueDays(), entity.getPaymentDescription());
-        }
-
-        SupplierRating rating = null;
-        if (entity.getQualityScore() != null) {
-            rating = new SupplierRating(
-                    entity.getQualityScore(), entity.getDeliveryScore(), entity.getPriceScore()
-            );
-        }
-
-        List<QualityCertificate> certificates = entity.getCertificates().stream()
-                .map(c -> new QualityCertificate(
-                        c.getCertificateType(), c.getIssuer(), c.getValidFrom(), c.getValidUntil()))
-                .collect(Collectors.toList());
-
-        return Supplier.reconstitute(
-                SupplierId.of(entity.getId()),
-                new SupplierName(entity.getName()),
-                address,
-                contactInfo,
-                paymentTerms,
-                certificates,
-                rating,
-                SupplierStatus.valueOf(entity.getStatus()),
-                entity.getCreatedAt(),
-                entity.getUpdatedAt()
-        );
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/ArticleJpaRepository.java

@@ -1,15 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.infrastructure.masterdata.persistence.entity.ArticleEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-import java.util.List;
-
-public interface ArticleJpaRepository extends JpaRepository<ArticleEntity, String> {
-
-    List<ArticleEntity> findByCategoryId(String categoryId);
-
-    List<ArticleEntity> findByStatus(String status);
-
-    boolean existsByArticleNumber(String articleNumber);
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/CustomerJpaRepository.java

@@ -1,15 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.infrastructure.masterdata.persistence.entity.CustomerEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-import java.util.List;
-
-public interface CustomerJpaRepository extends JpaRepository<CustomerEntity, String> {
-
-    List<CustomerEntity> findByType(String type);
-
-    List<CustomerEntity> findByStatus(String status);
-
-    boolean existsByName(String name);
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/FrameContractJpaRepository.java

@@ -1,16 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.infrastructure.masterdata.persistence.entity.FrameContractEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-import java.util.List;
-import java.util.Optional;
-
-public interface FrameContractJpaRepository extends JpaRepository<FrameContractEntity, String> {
-
-    Optional<FrameContractEntity> findByCustomerId(String customerId);
-
-    List<FrameContractEntity> findByCustomerIdIn(List<String> customerIds);
-
-    void deleteByCustomerId(String customerId);
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaArticleRepository.java

@@ -1,116 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.mapper.ArticleMapper;
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.shared.common.Result;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaArticleRepository implements ArticleRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaArticleRepository.class);
-
-    private final ArticleJpaRepository jpaRepository;
-    private final ArticleMapper mapper;
-
-    public JpaArticleRepository(ArticleJpaRepository jpaRepository, ArticleMapper mapper) {
-        this.jpaRepository = jpaRepository;
-        this.mapper = mapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<Article>> findById(ArticleId id) {
-        try {
-            Optional<Article> result = jpaRepository.findById(id.value())
-                    .map(mapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Article>> findAll() {
-        try {
-            List<Article> result = jpaRepository.findAll().stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Article>> findByCategory(ProductCategoryId categoryId) {
-        try {
-            List<Article> result = jpaRepository.findByCategoryId(categoryId.value()).stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByCategory", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Article>> findByStatus(ArticleStatus status) {
-        try {
-            List<Article> result = jpaRepository.findByStatus(status.name()).stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByStatus", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(Article article) {
-        try {
-            jpaRepository.save(mapper.toEntity(article));
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(Article article) {
-        try {
-            jpaRepository.deleteById(article.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByArticleNumber(ArticleNumber articleNumber) {
-        try {
-            return Result.success(jpaRepository.existsByArticleNumber(articleNumber.value()));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByArticleNumber", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaCustomerRepository.java

@@ -1,138 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.entity.CustomerEntity;
-import de.effigenix.infrastructure.masterdata.persistence.entity.FrameContractEntity;
-import de.effigenix.infrastructure.masterdata.persistence.mapper.CustomerMapper;
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.shared.common.Result;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.function.Function;
-import java.util.stream.Collectors;
-
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaCustomerRepository implements CustomerRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaCustomerRepository.class);
-
-    private final CustomerJpaRepository jpaRepository;
-    private final FrameContractJpaRepository frameContractJpaRepository;
-    private final CustomerMapper mapper;
-
-    public JpaCustomerRepository(CustomerJpaRepository jpaRepository,
-                                 FrameContractJpaRepository frameContractJpaRepository,
-                                 CustomerMapper mapper) {
-        this.jpaRepository = jpaRepository;
-        this.frameContractJpaRepository = frameContractJpaRepository;
-        this.mapper = mapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<Customer>> findById(CustomerId id) {
-        try {
-            var entityOpt = jpaRepository.findById(id.value());
-            if (entityOpt.isEmpty()) {
-                return Result.success(Optional.empty());
-            }
-            var fcEntity = frameContractJpaRepository.findByCustomerId(id.value()).orElse(null);
-            return Result.success(Optional.of(mapper.toDomain(entityOpt.get(), fcEntity)));
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Customer>> findAll() {
-        try {
-            return Result.success(mapWithFrameContracts(jpaRepository.findAll()));
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Customer>> findByType(CustomerType type) {
-        try {
-            return Result.success(mapWithFrameContracts(jpaRepository.findByType(type.name())));
-        } catch (Exception e) {
-            logger.trace("Database error in findByType", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Customer>> findByStatus(CustomerStatus status) {
-        try {
-            return Result.success(mapWithFrameContracts(jpaRepository.findByStatus(status.name())));
-        } catch (Exception e) {
-            logger.trace("Database error in findByStatus", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    private List<Customer> mapWithFrameContracts(List<CustomerEntity> entities) {
-        List<String> customerIds = entities.stream()
-                .map(CustomerEntity::getId)
-                .toList();
-        Map<String, FrameContractEntity> fcMap = frameContractJpaRepository.findByCustomerIdIn(customerIds).stream()
-                .collect(Collectors.toMap(FrameContractEntity::getCustomerId, Function.identity()));
-        return entities.stream()
-                .map(entity -> mapper.toDomain(entity, fcMap.get(entity.getId())))
-                .collect(Collectors.toList());
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(Customer customer) {
-        try {
-            jpaRepository.save(mapper.toEntity(customer));
-
-            // Handle FrameContract separately
-            frameContractJpaRepository.deleteByCustomerId(customer.id().value());
-            if (customer.frameContract() != null) {
-                var fcEntity = mapper.toFrameContractEntity(customer.frameContract(), customer.id().value());
-                frameContractJpaRepository.save(fcEntity);
-            }
-
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(Customer customer) {
-        try {
-            frameContractJpaRepository.deleteByCustomerId(customer.id().value());
-            jpaRepository.deleteById(customer.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByName(CustomerName name) {
-        try {
-            return Result.success(jpaRepository.existsByName(name.value()));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByName", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaProductCategoryRepository.java

@@ -1,93 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.domain.masterdata.CategoryName;
-import de.effigenix.domain.masterdata.ProductCategory;
-import de.effigenix.domain.masterdata.ProductCategoryId;
-import de.effigenix.domain.masterdata.ProductCategoryRepository;
-import de.effigenix.infrastructure.masterdata.persistence.mapper.ProductCategoryMapper;
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.shared.common.Result;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaProductCategoryRepository implements ProductCategoryRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaProductCategoryRepository.class);
-
-    private final ProductCategoryJpaRepository jpaRepository;
-    private final ProductCategoryMapper mapper;
-
-    public JpaProductCategoryRepository(ProductCategoryJpaRepository jpaRepository, ProductCategoryMapper mapper) {
-        this.jpaRepository = jpaRepository;
-        this.mapper = mapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<ProductCategory>> findById(ProductCategoryId id) {
-        try {
-            Optional<ProductCategory> result = jpaRepository.findById(id.value())
-                    .map(mapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<ProductCategory>> findAll() {
-        try {
-            List<ProductCategory> result = jpaRepository.findAll().stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(ProductCategory category) {
-        try {
-            jpaRepository.save(mapper.toEntity(category));
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(ProductCategory category) {
-        try {
-            jpaRepository.deleteById(category.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByName(CategoryName name) {
-        try {
-            return Result.success(jpaRepository.existsByName(name.value()));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByName", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaSupplierRepository.java

@@ -1,103 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.domain.masterdata.*;
-import de.effigenix.infrastructure.masterdata.persistence.mapper.SupplierMapper;
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.shared.common.Result;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaSupplierRepository implements SupplierRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaSupplierRepository.class);
-
-    private final SupplierJpaRepository jpaRepository;
-    private final SupplierMapper mapper;
-
-    public JpaSupplierRepository(SupplierJpaRepository jpaRepository, SupplierMapper mapper) {
-        this.jpaRepository = jpaRepository;
-        this.mapper = mapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<Supplier>> findById(SupplierId id) {
-        try {
-            Optional<Supplier> result = jpaRepository.findById(id.value())
-                    .map(mapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Supplier>> findAll() {
-        try {
-            List<Supplier> result = jpaRepository.findAll().stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Supplier>> findByStatus(SupplierStatus status) {
-        try {
-            List<Supplier> result = jpaRepository.findByStatus(status.name()).stream()
-                    .map(mapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByStatus", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(Supplier supplier) {
-        try {
-            jpaRepository.save(mapper.toEntity(supplier));
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(Supplier supplier) {
-        try {
-            jpaRepository.deleteById(supplier.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByName(SupplierName name) {
-        try {
-            return Result.success(jpaRepository.existsByName(name.value()));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByName", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/ProductCategoryJpaRepository.java

@@ -1,13 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.infrastructure.masterdata.persistence.entity.ProductCategoryEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-import java.util.Optional;
-
-public interface ProductCategoryJpaRepository extends JpaRepository<ProductCategoryEntity, String> {
-
-    boolean existsByName(String name);
-
-    Optional<ProductCategoryEntity> findByName(String name);
-}

backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/SupplierJpaRepository.java

@@ -1,13 +0,0 @@
-package de.effigenix.infrastructure.masterdata.persistence.repository;
-
-import de.effigenix.infrastructure.masterdata.persistence.entity.SupplierEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-import java.util.List;
-
-public interface SupplierJpaRepository extends JpaRepository<SupplierEntity, String> {
-
-    List<SupplierEntity> findByStatus(String status);
-
-    boolean existsByName(String name);
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/JdbcRoleRepository.java

@@ -0,0 +1,166 @@
+package de.effigenix.infrastructure.usermanagement.persistence;
+
+import de.effigenix.domain.usermanagement.*;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.*;
+
+@Repository
+@Profile("!no-db")
+public class JdbcRoleRepository implements RoleRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcRoleRepository.class);
+
+    private final JdbcClient jdbc;
+
+    public JdbcRoleRepository(JdbcClient jdbc) {
+        this.jdbc = jdbc;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Role>> findById(RoleId id) {
+        try {
+            var roleOpt = jdbc.sql("SELECT * FROM roles WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapRoleRow)
+                    .optional();
+            if (roleOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadPermissions(roleOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Role>> findByName(RoleName name) {
+        try {
+            var roleOpt = jdbc.sql("SELECT * FROM roles WHERE name = :name")
+                    .param("name", name.name())
+                    .query(this::mapRoleRow)
+                    .optional();
+            if (roleOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadPermissions(roleOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findByName", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<Role>> findAll() {
+        try {
+            var roles = jdbc.sql("SELECT * FROM roles ORDER BY name")
+                    .query(this::mapRoleRow)
+                    .list()
+                    .stream()
+                    .map(this::loadPermissions)
+                    .toList();
+            return Result.success(roles);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Role role) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE roles SET name = :name, description = :description
+                    WHERE id = :id
+                    """)
+                    .param("id", role.id().value())
+                    .param("name", role.name().name())
+                    .param("description", role.description())
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO roles (id, name, description)
+                        VALUES (:id, :name, :description)
+                        """)
+                        .param("id", role.id().value())
+                        .param("name", role.name().name())
+                        .param("description", role.description())
+                        .update();
+            }
+
+            savePermissions(role);
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Role role) {
+        try {
+            jdbc.sql("DELETE FROM roles WHERE id = :id")
+                    .param("id", role.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(RoleName name) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM roles WHERE name = :name")
+                    .param("name", name.name())
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByName", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private void savePermissions(Role role) {
+        jdbc.sql("DELETE FROM role_permissions WHERE role_id = :roleId")
+                .param("roleId", role.id().value())
+                .update();
+
+        for (Permission permission : role.permissions()) {
+            jdbc.sql("INSERT INTO role_permissions (role_id, permission) VALUES (:roleId, :permission)")
+                    .param("roleId", role.id().value())
+                    .param("permission", permission.name())
+                    .update();
+        }
+    }
+
+    private Role loadPermissions(Role role) {
+        var permissions = jdbc.sql("SELECT permission FROM role_permissions WHERE role_id = :roleId")
+                .param("roleId", role.id().value())
+                .query((rs, rowNum) -> Permission.valueOf(rs.getString("permission")))
+                .set();
+        return Role.reconstitute(role.id(), role.name(), permissions, role.description());
+    }
+
+    private Role mapRoleRow(ResultSet rs, int rowNum) throws SQLException {
+        return Role.reconstitute(
+                RoleId.of(rs.getString("id")),
+                RoleName.valueOf(rs.getString("name")),
+                Set.of(),
+                rs.getString("description")
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/JdbcUserRepository.java

@@ -0,0 +1,263 @@
+package de.effigenix.infrastructure.usermanagement.persistence;
+
+import de.effigenix.domain.usermanagement.*;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.OffsetDateTime;
+import java.util.*;
+
+@Repository
+@Profile("!no-db")
+public class JdbcUserRepository implements UserRepository {
+
+    private static final Logger logger = LoggerFactory.getLogger(JdbcUserRepository.class);
+
+    private final JdbcClient jdbc;
+    private final RoleRepository roleRepository;
+
+    public JdbcUserRepository(JdbcClient jdbc, RoleRepository roleRepository) {
+        this.jdbc = jdbc;
+        this.roleRepository = roleRepository;
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findById(UserId id) {
+        try {
+            var userOpt = jdbc.sql("SELECT * FROM users WHERE id = :id")
+                    .param("id", id.value())
+                    .query(this::mapUserRow)
+                    .optional();
+            if (userOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadRoles(userOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findById", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findByUsername(String username) {
+        try {
+            var userOpt = jdbc.sql("SELECT * FROM users WHERE username = :username")
+                    .param("username", username)
+                    .query(this::mapUserRow)
+                    .optional();
+            if (userOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadRoles(userOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findByUsername", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findByEmail(String email) {
+        try {
+            var userOpt = jdbc.sql("SELECT * FROM users WHERE email = :email")
+                    .param("email", email)
+                    .query(this::mapUserRow)
+                    .optional();
+            if (userOpt.isEmpty()) {
+                return Result.success(Optional.empty());
+            }
+            return Result.success(Optional.of(loadRoles(userOpt.get())));
+        } catch (Exception e) {
+            logger.trace("Database error in findByEmail", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findByBranchId(String branchId) {
+        try {
+            var users = jdbc.sql("SELECT * FROM users WHERE branch_id = :branchId")
+                    .param("branchId", branchId)
+                    .query(this::mapUserRow)
+                    .list()
+                    .stream()
+                    .map(this::loadRoles)
+                    .toList();
+            return Result.success(users);
+        } catch (Exception e) {
+            logger.trace("Database error in findByBranchId", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findByStatus(UserStatus status) {
+        try {
+            var users = jdbc.sql("SELECT * FROM users WHERE status = :status")
+                    .param("status", status.name())
+                    .query(this::mapUserRow)
+                    .list()
+                    .stream()
+                    .map(this::loadRoles)
+                    .toList();
+            return Result.success(users);
+        } catch (Exception e) {
+            logger.trace("Database error in findByStatus", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findAll() {
+        try {
+            var users = jdbc.sql("SELECT * FROM users ORDER BY username")
+                    .query(this::mapUserRow)
+                    .list()
+                    .stream()
+                    .map(this::loadRoles)
+                    .toList();
+            return Result.success(users);
+        } catch (Exception e) {
+            logger.trace("Database error in findAll", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(User user) {
+        try {
+            int rows = jdbc.sql("""
+                    UPDATE users
+                    SET username = :username, email = :email, password_hash = :passwordHash,
+                        branch_id = :branchId, status = :status, last_login = :lastLogin
+                    WHERE id = :id
+                    """)
+                    .param("id", user.id().value())
+                    .param("username", user.username())
+                    .param("email", user.email())
+                    .param("passwordHash", user.passwordHash().value())
+                    .param("branchId", user.branchId())
+                    .param("status", user.status().name())
+                    .param("lastLogin", user.lastLogin())
+                    .update();
+
+            if (rows == 0) {
+                jdbc.sql("""
+                        INSERT INTO users (id, username, email, password_hash, branch_id, status, created_at, last_login)
+                        VALUES (:id, :username, :email, :passwordHash, :branchId, :status, :createdAt, :lastLogin)
+                        """)
+                        .param("id", user.id().value())
+                        .param("username", user.username())
+                        .param("email", user.email())
+                        .param("passwordHash", user.passwordHash().value())
+                        .param("branchId", user.branchId())
+                        .param("status", user.status().name())
+                        .param("createdAt", user.createdAt())
+                        .param("lastLogin", user.lastLogin())
+                        .update();
+            }
+
+            saveUserRoles(user);
+
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in save", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(User user) {
+        try {
+            jdbc.sql("DELETE FROM users WHERE id = :id")
+                    .param("id", user.id().value())
+                    .update();
+            return Result.success(null);
+        } catch (Exception e) {
+            logger.trace("Database error in delete", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByUsername(String username) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM users WHERE username = :username")
+                    .param("username", username)
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByUsername", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByEmail(String email) {
+        try {
+            int count = jdbc.sql("SELECT COUNT(*) FROM users WHERE email = :email")
+                    .param("email", email)
+                    .query(Integer.class)
+                    .single();
+            return Result.success(count > 0);
+        } catch (Exception e) {
+            logger.trace("Database error in existsByEmail", e);
+            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
+        }
+    }
+
+    private void saveUserRoles(User user) {
+        jdbc.sql("DELETE FROM user_roles WHERE user_id = :userId")
+                .param("userId", user.id().value())
+                .update();
+
+        for (Role role : user.roles()) {
+            jdbc.sql("INSERT INTO user_roles (user_id, role_id) VALUES (:userId, :roleId)")
+                    .param("userId", user.id().value())
+                    .param("roleId", role.id().value())
+                    .update();
+        }
+    }
+
+    private User loadRoles(User user) {
+        var roleIds = jdbc.sql("SELECT role_id FROM user_roles WHERE user_id = :userId")
+                .param("userId", user.id().value())
+                .query((rs, rowNum) -> rs.getString("role_id"))
+                .list();
+
+        Set<Role> roles = new HashSet<>();
+        for (String roleId : roleIds) {
+            switch (roleRepository.findById(RoleId.of(roleId))) {
+                case Result.Success(var opt) -> opt.ifPresent(roles::add);
+                case Result.Failure(var err) ->
+                    logger.trace("Failed to load role {}: {}", roleId, err.message());
+            }
+        }
+
+        return User.reconstitute(
+                user.id(), user.username(), user.email(), user.passwordHash(),
+                roles, user.branchId(), user.status(), user.createdAt(), user.lastLogin()
+        );
+    }
+
+    private User mapUserRow(ResultSet rs, int rowNum) throws SQLException {
+        return User.reconstitute(
+                UserId.of(rs.getString("id")),
+                rs.getString("username"),
+                rs.getString("email"),
+                PasswordHash.of(rs.getString("password_hash")),
+                Set.of(),
+                rs.getString("branch_id"),
+                UserStatus.valueOf(rs.getString("status")),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("last_login", OffsetDateTime.class)
+        );
+    }
+}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/entity/RoleEntity.java

@@ -1,83 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.entity;
-
-import de.effigenix.domain.usermanagement.Permission;
-import de.effigenix.domain.usermanagement.RoleName;
-import jakarta.persistence.*;
-
-import java.util.HashSet;
-import java.util.Set;
-
-/**
- * JPA Entity for Role.
- * Infrastructure layer - NOT part of domain model!
- */
-@Entity
-@Table(name = "roles")
-public class RoleEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Enumerated(EnumType.STRING)
-    @Column(name = "name", nullable = false, unique = true, length = 50)
-    private RoleName name;
-
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(name = "role_permissions", joinColumns = @JoinColumn(name = "role_id"))
-    @Enumerated(EnumType.STRING)
-    @Column(name = "permission", nullable = false, length = 100)
-    private Set<Permission> permissions = new HashSet<>();
-
-    @Column(name = "description", length = 500)
-    private String description;
-
-    // JPA requires no-arg constructor
-    protected RoleEntity() {
-    }
-
-    public RoleEntity(
-            String id,
-            RoleName name,
-            Set<Permission> permissions,
-            String description
-    ) {
-        this.id = id;
-        this.name = name;
-        this.permissions = permissions != null ? permissions : new HashSet<>();
-        this.description = description;
-    }
-
-    // Getters and Setters
-    public String getId() {
-        return id;
-    }
-
-    public void setId(String id) {
-        this.id = id;
-    }
-
-    public RoleName getName() {
-        return name;
-    }
-
-    public void setName(RoleName name) {
-        this.name = name;
-    }
-
-    public Set<Permission> getPermissions() {
-        return permissions;
-    }
-
-    public void setPermissions(Set<Permission> permissions) {
-        this.permissions = permissions;
-    }
-
-    public String getDescription() {
-        return description;
-    }
-
-    public void setDescription(String description) {
-        this.description = description;
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/entity/UserEntity.java

@@ -1,154 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.entity;
-
-import de.effigenix.domain.usermanagement.UserStatus;
-import jakarta.persistence.*;
-import org.springframework.data.annotation.CreatedDate;
-import org.springframework.data.jpa.domain.support.AuditingEntityListener;
-
-import java.time.OffsetDateTime;
-import java.util.HashSet;
-import java.util.Set;
-
-/**
- * JPA Entity for User.
- * Infrastructure layer - NOT part of domain model!
- */
-@Entity
-@Table(name = "users")
-@EntityListeners(AuditingEntityListener.class)
-public class UserEntity {
-
-    @Id
-    @Column(name = "id", nullable = false, length = 36)
-    private String id;
-
-    @Column(name = "username", nullable = false, unique = true, length = 100)
-    private String username;
-
-    @Column(name = "email", nullable = false, unique = true, length = 255)
-    private String email;
-
-    @Column(name = "password_hash", nullable = false, length = 60)
-    private String passwordHash;
-
-    @ManyToMany(fetch = FetchType.EAGER)
-    @JoinTable(
-            name = "user_roles",
-            joinColumns = @JoinColumn(name = "user_id"),
-            inverseJoinColumns = @JoinColumn(name = "role_id")
-    )
-    private Set<RoleEntity> roles = new HashSet<>();
-
-    @Column(name = "branch_id", length = 36)
-    private String branchId;
-
-    @Enumerated(EnumType.STRING)
-    @Column(name = "status", nullable = false, length = 20)
-    private UserStatus status;
-
-    @CreatedDate
-    @Column(name = "created_at", nullable = false, updatable = false)
-    private OffsetDateTime createdAt;
-
-    @Column(name = "last_login")
-    private OffsetDateTime lastLogin;
-
-    // JPA requires no-arg constructor
-    protected UserEntity() {
-    }
-
-    public UserEntity(
-            String id,
-            String username,
-            String email,
-            String passwordHash,
-            Set<RoleEntity> roles,
-            String branchId,
-            UserStatus status,
-            OffsetDateTime createdAt,
-            OffsetDateTime lastLogin
-    ) {
-        this.id = id;
-        this.username = username;
-        this.email = email;
-        this.passwordHash = passwordHash;
-        this.roles = roles != null ? roles : new HashSet<>();
-        this.branchId = branchId;
-        this.status = status;
-        this.createdAt = createdAt;
-        this.lastLogin = lastLogin;
-    }
-
-    // Getters and Setters
-    public String getId() {
-        return id;
-    }
-
-    public void setId(String id) {
-        this.id = id;
-    }
-
-    public String getUsername() {
-        return username;
-    }
-
-    public void setUsername(String username) {
-        this.username = username;
-    }
-
-    public String getEmail() {
-        return email;
-    }
-
-    public void setEmail(String email) {
-        this.email = email;
-    }
-
-    public String getPasswordHash() {
-        return passwordHash;
-    }
-
-    public void setPasswordHash(String passwordHash) {
-        this.passwordHash = passwordHash;
-    }
-
-    public Set<RoleEntity> getRoles() {
-        return roles;
-    }
-
-    public void setRoles(Set<RoleEntity> roles) {
-        this.roles = roles;
-    }
-
-    public String getBranchId() {
-        return branchId;
-    }
-
-    public void setBranchId(String branchId) {
-        this.branchId = branchId;
-    }
-
-    public UserStatus getStatus() {
-        return status;
-    }
-
-    public void setStatus(UserStatus status) {
-        this.status = status;
-    }
-
-    public OffsetDateTime getCreatedAt() {
-        return createdAt;
-    }
-
-    public void setCreatedAt(OffsetDateTime createdAt) {
-        this.createdAt = createdAt;
-    }
-
-    public OffsetDateTime getLastLogin() {
-        return lastLogin;
-    }
-
-    public void setLastLogin(OffsetDateTime lastLogin) {
-        this.lastLogin = lastLogin;
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/mapper/RoleMapper.java

@@ -1,55 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.mapper;
-
-import de.effigenix.domain.usermanagement.Role;
-import de.effigenix.domain.usermanagement.RoleId;
-import de.effigenix.infrastructure.usermanagement.persistence.entity.RoleEntity;
-import org.springframework.stereotype.Component;
-
-import java.util.HashSet;
-
-/**
- * Maps between Role domain entity and RoleEntity JPA entity.
- * Infrastructure Layer - translates between Domain and Persistence layers.
- *
- * This is a crucial part of Hexagonal Architecture:
- * - Domain layer defines pure business logic (Role)
- * - Infrastructure layer handles persistence (RoleEntity)
- * - Mapper translates between the two layers
- */
-@Component
-public class RoleMapper {
-
-    /**
-     * Converts a Role domain entity to a RoleEntity JPA entity.
-     * Used when saving to the database.
-     */
-    public RoleEntity toEntity(Role role) {
-        if (role == null) {
-            return null;
-        }
-
-        return new RoleEntity(
-                role.id().value(),
-                role.name(),
-                new HashSet<>(role.permissions()),
-                role.description()
-        );
-    }
-
-    /**
-     * Converts a RoleEntity JPA entity to a Role domain entity.
-     * Used when loading from the database.
-     */
-    public Role toDomain(RoleEntity entity) {
-        if (entity == null) {
-            return null;
-        }
-
-        return Role.reconstitute(
-                RoleId.of(entity.getId()),
-                entity.getName(),
-                new HashSet<>(entity.getPermissions()),
-                entity.getDescription()
-        );
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/mapper/UserMapper.java

@@ -1,83 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.mapper;
-
-import de.effigenix.domain.usermanagement.*;
-import de.effigenix.infrastructure.usermanagement.persistence.entity.RoleEntity;
-import de.effigenix.infrastructure.usermanagement.persistence.entity.UserEntity;
-import org.springframework.stereotype.Component;
-
-import java.util.HashSet;
-import java.util.Set;
-import java.util.stream.Collectors;
-
-/**
- * Maps between User domain entity and UserEntity JPA entity.
- * Infrastructure Layer - translates between Domain and Persistence layers.
- *
- * This is a crucial part of Hexagonal Architecture:
- * - Domain layer defines pure business logic (User)
- * - Infrastructure layer handles persistence (UserEntity)
- * - Mapper translates between the two layers
- */
-@Component
-public class UserMapper {
-
-    private final RoleMapper roleMapper;
-
-    public UserMapper(RoleMapper roleMapper) {
-        this.roleMapper = roleMapper;
-    }
-
-    /**
-     * Converts a User domain entity to a UserEntity JPA entity.
-     * Used when saving to the database.
-     */
-    public UserEntity toEntity(User user) {
-        if (user == null) {
-            return null;
-        }
-
-        Set<RoleEntity> roleEntities = user.roles().stream()
-                .map(roleMapper::toEntity)
-                .collect(Collectors.toSet());
-
-        return new UserEntity(
-                user.id().value(),
-                user.username(),
-                user.email(),
-                user.passwordHash().value(),
-                roleEntities,
-                user.branchId(),
-                user.status(),
-                user.createdAt(),
-                user.lastLogin()
-        );
-    }
-
-    /**
-     * Converts a UserEntity JPA entity to a User domain entity.
-     * Used when loading from the database.
-     */
-    public User toDomain(UserEntity entity) {
-        if (entity == null) {
-            return null;
-        }
-
-        Set<Role> roles = entity.getRoles() != null
-                ? entity.getRoles().stream()
-                        .map(roleMapper::toDomain)
-                        .collect(Collectors.toSet())
-                : new HashSet<>();
-
-        return User.reconstitute(
-                UserId.of(entity.getId()),
-                entity.getUsername(),
-                entity.getEmail(),
-                PasswordHash.of(entity.getPasswordHash()),
-                roles,
-                entity.getBranchId(),
-                entity.getStatus(),
-                entity.getCreatedAt(),
-                entity.getLastLogin()
-        );
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaRoleRepository.java

@@ -1,117 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.repository;
-
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.domain.usermanagement.Role;
-import de.effigenix.domain.usermanagement.RoleId;
-import de.effigenix.domain.usermanagement.RoleName;
-import de.effigenix.domain.usermanagement.RoleRepository;
-import de.effigenix.infrastructure.usermanagement.persistence.mapper.RoleMapper;
-import de.effigenix.shared.common.Result;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-/**
- * JPA Adapter for RoleRepository (Domain Interface).
- * Infrastructure Layer - implements the Domain's RoleRepository interface.
- *
- * This is the Adapter pattern in Hexagonal Architecture:
- * - Domain defines the interface (RoleRepository)
- * - Infrastructure implements it (JpaRoleRepository)
- * - Uses Spring Data JPA (RoleJpaRepository) internally
- * - Translates between Domain and JPA entities using RoleMapper
- *
- * @Transactional ensures database consistency.
- */
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaRoleRepository implements RoleRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaRoleRepository.class);
-
-    private final RoleJpaRepository jpaRepository;
-    private final RoleMapper roleMapper;
-
-    public JpaRoleRepository(RoleJpaRepository jpaRepository, RoleMapper roleMapper) {
-        this.jpaRepository = jpaRepository;
-        this.roleMapper = roleMapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<Role>> findById(RoleId id) {
-        try {
-            Optional<Role> result = jpaRepository.findById(id.value())
-                    .map(roleMapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<Role>> findByName(RoleName name) {
-        try {
-            Optional<Role> result = jpaRepository.findByName(name)
-                    .map(roleMapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByName", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<Role>> findAll() {
-        try {
-            List<Role> result = jpaRepository.findAll().stream()
-                    .map(roleMapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(Role role) {
-        try {
-            jpaRepository.save(roleMapper.toEntity(role));
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(Role role) {
-        try {
-            jpaRepository.deleteById(role.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByName(RoleName name) {
-        try {
-            return Result.success(jpaRepository.existsByName(name));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByName", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaUserRepository.java

@@ -1,164 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.repository;
-
-import de.effigenix.shared.common.RepositoryError;
-import de.effigenix.domain.usermanagement.User;
-import de.effigenix.domain.usermanagement.UserId;
-import de.effigenix.domain.usermanagement.UserRepository;
-import de.effigenix.domain.usermanagement.UserStatus;
-import de.effigenix.infrastructure.usermanagement.persistence.mapper.UserMapper;
-import de.effigenix.shared.common.Result;
-import org.springframework.context.annotation.Profile;
-import org.springframework.stereotype.Repository;
-import org.springframework.transaction.annotation.Transactional;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.List;
-import java.util.Optional;
-import java.util.stream.Collectors;
-
-/**
- * JPA Adapter for UserRepository (Domain Interface).
- * Infrastructure Layer - implements the Domain's UserRepository interface.
- *
- * This is the Adapter pattern in Hexagonal Architecture:
- * - Domain defines the interface (UserRepository)
- * - Infrastructure implements it (JpaUserRepository)
- * - Uses Spring Data JPA (UserJpaRepository) internally
- * - Translates between Domain and JPA entities using UserMapper
- *
- * @Transactional ensures database consistency.
- */
-@Repository
-@Profile("!no-db")
-@Transactional(readOnly = true)
-public class JpaUserRepository implements UserRepository {
-
-    private static final Logger logger = LoggerFactory.getLogger(JpaUserRepository.class);
-    private final UserJpaRepository jpaRepository;
-    private final UserMapper userMapper;
-
-    public JpaUserRepository(UserJpaRepository jpaRepository, UserMapper userMapper) {
-        this.jpaRepository = jpaRepository;
-        this.userMapper = userMapper;
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<User>> findById(UserId id) {
-        try {
-            Optional<User> result = jpaRepository.findById(id.value())
-                    .map(userMapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findById", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<User>> findByUsername(String username) {
-        try {
-            Optional<User> result = jpaRepository.findByUsername(username)
-                    .map(userMapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByUsername", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Optional<User>> findByEmail(String email) {
-        try {
-            Optional<User> result = jpaRepository.findByEmail(email)
-                    .map(userMapper::toDomain);
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByEmail", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<User>> findByBranchId(String branchId) {
-        try {
-            List<User> result = jpaRepository.findByBranchId(branchId).stream()
-                    .map(userMapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByBranchId", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<User>> findByStatus(UserStatus status) {
-        try {
-            List<User> result = jpaRepository.findByStatus(status).stream()
-                    .map(userMapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findByStatus", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, List<User>> findAll() {
-        try {
-            List<User> result = jpaRepository.findAll().stream()
-                    .map(userMapper::toDomain)
-                    .collect(Collectors.toList());
-            return Result.success(result);
-        } catch (Exception e) {
-            logger.trace("Database error in findAll", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> save(User user) {
-        try {
-            jpaRepository.save(userMapper.toEntity(user));
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in save", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    @Transactional
-    public Result<RepositoryError, Void> delete(User user) {
-        try {
-            jpaRepository.deleteById(user.id().value());
-            return Result.success(null);
-        } catch (Exception e) {
-            logger.trace("Database error in delete", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByUsername(String username) {
-        try {
-            return Result.success(jpaRepository.existsByUsername(username));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByUsername", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-
-    @Override
-    public Result<RepositoryError, Boolean> existsByEmail(String email) {
-        try {
-            return Result.success(jpaRepository.existsByEmail(email));
-        } catch (Exception e) {
-            logger.trace("Database error in existsByEmail", e);
-            return Result.failure(new RepositoryError.DatabaseError(e.getMessage()));
-        }
-    }
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/RoleJpaRepository.java

@@ -1,28 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.repository;
-
-import de.effigenix.domain.usermanagement.RoleName;
-import de.effigenix.infrastructure.usermanagement.persistence.entity.RoleEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.stereotype.Repository;
-
-import java.util.Optional;
-
-/**
- * Spring Data JPA Repository for RoleEntity.
- * Infrastructure Layer - automatically provides CRUD operations.
- *
- * Spring Data generates implementations at runtime based on method names.
- */
-@Repository
-public interface RoleJpaRepository extends JpaRepository<RoleEntity, String> {
-
-    /**
-     * Finds a role by its name.
-     */
-    Optional<RoleEntity> findByName(RoleName name);
-
-    /**
-     * Checks if a role with the given name exists.
-     */
-    boolean existsByName(RoleName name);
-}

backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/UserJpaRepository.java

@@ -1,49 +0,0 @@
-package de.effigenix.infrastructure.usermanagement.persistence.repository;
-
-import de.effigenix.domain.usermanagement.UserStatus;
-import de.effigenix.infrastructure.usermanagement.persistence.entity.UserEntity;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.stereotype.Repository;
-
-import java.util.List;
-import java.util.Optional;
-
-/**
- * Spring Data JPA Repository for UserEntity.
- * Infrastructure Layer - automatically provides CRUD operations.
- *
- * Spring Data generates implementations at runtime based on method names.
- */
-@Repository
-public interface UserJpaRepository extends JpaRepository<UserEntity, String> {
-
-    /**
-     * Finds a user by their username.
-     */
-    Optional<UserEntity> findByUsername(String username);
-
-    /**
-     * Finds a user by their email.
-     */
-    Optional<UserEntity> findByEmail(String email);
-
-    /**
-     * Finds all users assigned to a specific branch.
-     */
-    List<UserEntity> findByBranchId(String branchId);
-
-    /**
-     * Finds all users with a specific status.
-     */
-    List<UserEntity> findByStatus(UserStatus status);
-
-    /**
-     * Checks if a username already exists.
-     */
-    boolean existsByUsername(String username);
-
-    /**
-     * Checks if an email already exists.
-     */
-    boolean existsByEmail(String email);
-}