diff --git a/backend/src/main/java/de/effigenix/EffigenixApplication.java b/backend/src/main/java/de/effigenix/EffigenixApplication.java
index 2d87769..f17d281 100644
--- a/backend/src/main/java/de/effigenix/EffigenixApplication.java
+++ b/backend/src/main/java/de/effigenix/EffigenixApplication.java
@@ -1,8 +1,8 @@
 package de.effigenix;
 
+import de.effigenix.infrastructure.config.DatabaseProfileInitializer;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 import org.springframework.scheduling.annotation.EnableAsync;
 
 /**
@@ -15,11 +15,12 @@ import org.springframework.scheduling.annotation.EnableAsync;
  * - Shared Kernel: Cross-cutting concerns (AuthorizationPort, Result, etc.)
  */
 @SpringBootApplication
-@EnableJpaAuditing
 @EnableAsync
 public class EffigenixApplication {
 
     public static void main(String[] args) {
-        SpringApplication.run(EffigenixApplication.class, args);
+        var app = new SpringApplication(EffigenixApplication.class);
+        app.addInitializers(new DatabaseProfileInitializer());
+        app.run(args);
     }
 }
diff --git a/backend/src/main/java/de/effigenix/infrastructure/audit/DatabaseAuditLogger.java b/backend/src/main/java/de/effigenix/infrastructure/audit/DatabaseAuditLogger.java
index ea3d50e..bc74709 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/audit/DatabaseAuditLogger.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/audit/DatabaseAuditLogger.java
@@ -6,6 +6,7 @@ import de.effigenix.shared.security.ActorId;
 import jakarta.servlet.http.HttpServletRequest;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
@@ -30,6 +31,7 @@ import java.util.UUID;
  * - Uses REQUIRES_NEW transaction to ensure audit logs are committed even if business transaction fails
  */
 @Service
+@Profile("!no-db")
 public class DatabaseAuditLogger implements AuditLogger {
 
     private static final Logger log = LoggerFactory.getLogger(DatabaseAuditLogger.class);
diff --git a/backend/src/main/java/de/effigenix/infrastructure/config/DatabaseProfileInitializer.java b/backend/src/main/java/de/effigenix/infrastructure/config/DatabaseProfileInitializer.java
new file mode 100644
index 0000000..1088ed5
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/config/DatabaseProfileInitializer.java
@@ -0,0 +1,34 @@
+package de.effigenix.infrastructure.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.env.ConfigurableEnvironment;
+
+import java.sql.DriverManager;
+
+/**
+ * Prüft vor dem Context-Start, ob die Datenbank erreichbar ist.
+ * Schlägt die Verbindung fehl, wird das Spring-Profil "no-db" aktiviert.
+ * Damit werden JPA, DataSource und Liquibase ausgeschlossen und Stub-Beans registriert.
+ */
+public class DatabaseProfileInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
+
+    private static final Logger log = LoggerFactory.getLogger(DatabaseProfileInitializer.class);
+
+    @Override
+    public void initialize(ConfigurableApplicationContext ctx) {
+        var env = ctx.getEnvironment();
+        var url  = env.getProperty("spring.datasource.url",      "jdbc:postgresql://localhost:5432/effigenix");
+        var user = env.getProperty("spring.datasource.username", "effigenix");
+        var pass = env.getProperty("spring.datasource.password", "effigenix");
+
+        try (var ignored = DriverManager.getConnection(url, user, pass)) {
+            log.debug("Datenbankverbindung erfolgreich – normaler Start.");
+        } catch (Exception e) {
+            log.warn("⚠️  Keine Datenbankverbindung – Stub-Modus aktiv. Einige Features sind nicht verfügbar. ({})", e.getMessage());
+            ((ConfigurableEnvironment) env).addActiveProfile("no-db");
+        }
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/config/JpaAuditingConfig.java b/backend/src/main/java/de/effigenix/infrastructure/config/JpaAuditingConfig.java
new file mode 100644
index 0000000..ff165e2
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/config/JpaAuditingConfig.java
@@ -0,0 +1,14 @@
+package de.effigenix.infrastructure.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+/**
+ * Aktiviert JPA-Auditing nur, wenn eine Datenbankverbindung vorhanden ist.
+ */
+@Configuration
+@Profile("!no-db")
+@EnableJpaAuditing
+public class JpaAuditingConfig {
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaArticleRepository.java b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaArticleRepository.java
index a76f142..7da7dd7 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaArticleRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaArticleRepository.java
@@ -4,6 +4,7 @@ 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.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -12,6 +13,7 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaArticleRepository implements ArticleRepository {
 
diff --git a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaCustomerRepository.java b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaCustomerRepository.java
index 00d822b..311b87a 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaCustomerRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaCustomerRepository.java
@@ -5,6 +5,7 @@ import de.effigenix.infrastructure.masterdata.persistence.entity.FrameContractEn
 import de.effigenix.infrastructure.masterdata.persistence.mapper.CustomerMapper;
 import de.effigenix.shared.common.RepositoryError;
 import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -13,6 +14,7 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaCustomerRepository implements CustomerRepository {
 
diff --git a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaProductCategoryRepository.java b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaProductCategoryRepository.java
index a9b71a7..8828fc6 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaProductCategoryRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaProductCategoryRepository.java
@@ -7,6 +7,7 @@ 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.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -15,6 +16,7 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaProductCategoryRepository implements ProductCategoryRepository {
 
diff --git a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaSupplierRepository.java b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaSupplierRepository.java
index 4af2358..92efd78 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaSupplierRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/masterdata/persistence/repository/JpaSupplierRepository.java
@@ -4,6 +4,7 @@ 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.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -12,6 +13,7 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaSupplierRepository implements SupplierRepository {
 
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/NoOpAuditLogger.java b/backend/src/main/java/de/effigenix/infrastructure/stub/NoOpAuditLogger.java
new file mode 100644
index 0000000..9db18af
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/NoOpAuditLogger.java
@@ -0,0 +1,36 @@
+package de.effigenix.infrastructure.stub;
+
+import de.effigenix.application.usermanagement.AuditEvent;
+import de.effigenix.application.usermanagement.AuditLogger;
+import de.effigenix.shared.security.ActorId;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Service;
+
+/**
+ * No-Op-Implementierung von AuditLogger für den Stub-Modus (keine Datenbankverbindung).
+ * Audit-Events werden verworfen.
+ */
+@Service
+@Profile("no-db")
+public class NoOpAuditLogger implements AuditLogger {
+
+    @Override
+    public void log(AuditEvent event, String entityId, ActorId performedBy) {
+        // Stub: kein Audit-Log
+    }
+
+    @Override
+    public void log(AuditEvent event, String details) {
+        // Stub: kein Audit-Log
+    }
+
+    @Override
+    public void log(AuditEvent event, String entityId, String details, ActorId performedBy) {
+        // Stub: kein Audit-Log
+    }
+
+    @Override
+    public void log(AuditEvent event, ActorId performedBy) {
+        // Stub: kein Audit-Log
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubArticleRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubArticleRepository.java
new file mode 100644
index 0000000..03f5a83
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubArticleRepository.java
@@ -0,0 +1,58 @@
+package de.effigenix.infrastructure.stub;
+
+import de.effigenix.domain.masterdata.Article;
+import de.effigenix.domain.masterdata.ArticleId;
+import de.effigenix.domain.masterdata.ArticleNumber;
+import de.effigenix.domain.masterdata.ArticleRepository;
+import de.effigenix.domain.masterdata.ArticleStatus;
+import de.effigenix.domain.masterdata.ProductCategoryId;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubArticleRepository implements ArticleRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<Article>> findById(ArticleId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findByCategory(ProductCategoryId categoryId) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Article>> findByStatus(ArticleStatus status) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Article article) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Article article) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByArticleNumber(ArticleNumber articleNumber) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubCustomerRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubCustomerRepository.java
new file mode 100644
index 0000000..31a14af
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubCustomerRepository.java
@@ -0,0 +1,58 @@
+package de.effigenix.infrastructure.stub;
+
+import de.effigenix.domain.masterdata.Customer;
+import de.effigenix.domain.masterdata.CustomerId;
+import de.effigenix.domain.masterdata.CustomerName;
+import de.effigenix.domain.masterdata.CustomerRepository;
+import de.effigenix.domain.masterdata.CustomerStatus;
+import de.effigenix.domain.masterdata.CustomerType;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubCustomerRepository implements CustomerRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<Customer>> findById(CustomerId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findByType(CustomerType type) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Customer>> findByStatus(CustomerStatus status) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Customer customer) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Customer customer) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(CustomerName name) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubProductCategoryRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubProductCategoryRepository.java
new file mode 100644
index 0000000..04d482f
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubProductCategoryRepository.java
@@ -0,0 +1,46 @@
+package de.effigenix.infrastructure.stub;
+
+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.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubProductCategoryRepository implements ProductCategoryRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<ProductCategory>> findById(ProductCategoryId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<ProductCategory>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(ProductCategory category) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(ProductCategory category) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(CategoryName name) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubRoleRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubRoleRepository.java
new file mode 100644
index 0000000..22b02e6
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubRoleRepository.java
@@ -0,0 +1,51 @@
+package de.effigenix.infrastructure.stub;
+
+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.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubRoleRepository implements RoleRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<Role>> findById(RoleId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<Role>> findByName(RoleName name) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Role>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Role role) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Role role) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(RoleName name) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubSupplierRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubSupplierRepository.java
new file mode 100644
index 0000000..ff99609
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubSupplierRepository.java
@@ -0,0 +1,52 @@
+package de.effigenix.infrastructure.stub;
+
+import de.effigenix.domain.masterdata.Supplier;
+import de.effigenix.domain.masterdata.SupplierId;
+import de.effigenix.domain.masterdata.SupplierName;
+import de.effigenix.domain.masterdata.SupplierRepository;
+import de.effigenix.domain.masterdata.SupplierStatus;
+import de.effigenix.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubSupplierRepository implements SupplierRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<Supplier>> findById(SupplierId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Supplier>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<Supplier>> findByStatus(SupplierStatus status) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(Supplier supplier) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(Supplier supplier) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByName(SupplierName name) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/stub/StubUserRepository.java b/backend/src/main/java/de/effigenix/infrastructure/stub/StubUserRepository.java
new file mode 100644
index 0000000..72485d0
--- /dev/null
+++ b/backend/src/main/java/de/effigenix/infrastructure/stub/StubUserRepository.java
@@ -0,0 +1,71 @@
+package de.effigenix.infrastructure.stub;
+
+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.shared.common.RepositoryError;
+import de.effigenix.shared.common.Result;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+@Profile("no-db")
+public class StubUserRepository implements UserRepository {
+
+    private static final RepositoryError.DatabaseError STUB_ERROR =
+            new RepositoryError.DatabaseError("Stub-Modus: keine Datenbankverbindung");
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findById(UserId id) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findByUsername(String username) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Optional<User>> findByEmail(String email) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findByBranchId(String branchId) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findByStatus(UserStatus status) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, List<User>> findAll() {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> save(User user) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Void> delete(User user) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByUsername(String username) {
+        return Result.failure(STUB_ERROR);
+    }
+
+    @Override
+    public Result<RepositoryError, Boolean> existsByEmail(String email) {
+        return Result.failure(STUB_ERROR);
+    }
+}
diff --git a/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaRoleRepository.java b/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaRoleRepository.java
index 540f775..b7c159e 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaRoleRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaRoleRepository.java
@@ -7,6 +7,7 @@ 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;
 
@@ -27,6 +28,7 @@ import java.util.stream.Collectors;
  * @Transactional ensures database consistency.
  */
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaRoleRepository implements RoleRepository {
 
diff --git a/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaUserRepository.java b/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaUserRepository.java
index e038dda..32cb9b6 100644
--- a/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaUserRepository.java
+++ b/backend/src/main/java/de/effigenix/infrastructure/usermanagement/persistence/repository/JpaUserRepository.java
@@ -7,6 +7,7 @@ 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;
 
@@ -27,6 +28,7 @@ import java.util.stream.Collectors;
  * @Transactional ensures database consistency.
  */
 @Repository
+@Profile("!no-db")
 @Transactional(readOnly = true)
 public class JpaUserRepository implements UserRepository {
 
diff --git a/backend/src/main/resources/application-no-db.yml b/backend/src/main/resources/application-no-db.yml
new file mode 100644
index 0000000..e167e7e
--- /dev/null
+++ b/backend/src/main/resources/application-no-db.yml
@@ -0,0 +1,8 @@
+spring:
+  autoconfigure:
+    exclude:
+      - org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
+      - org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration
+      - org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration
+      - org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration
+      - org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration