diff --git a/backend/src/main/java/de/svencarstensen/muh/service/CatalogService.java b/backend/src/main/java/de/svencarstensen/muh/service/CatalogService.java
index 243bdff..56721d0 100644
--- a/backend/src/main/java/de/svencarstensen/muh/service/CatalogService.java
+++ b/backend/src/main/java/de/svencarstensen/muh/service/CatalogService.java
@@ -439,6 +439,7 @@ public class CatalogService {
                     encodeIfPresent(mutation.password()),
                     mutation.active(),
                     adminManaged ? normalizeManagedRole(mutation.role()) : UserRole.CUSTOMER,
+                    100000L,
                     now,
                     now
             ));
@@ -471,6 +472,7 @@ public class CatalogService {
                 actor.role() == UserRole.ADMIN
                         ? (mutation.role() == null ? normalizeStoredRole(existing.role()) : normalizeManagedRole(mutation.role()))
                         : normalizeStoredRole(existing.role()),
+                existing.nextSampleNumber(),
                 existing.createdAt(),
                 now
         ));
@@ -517,6 +519,7 @@ public class CatalogService {
                 passwordEncoder.encode(newPassword),
                 existing.active(),
                 existing.role(),
+                existing.nextSampleNumber(),
                 existing.createdAt(),
                 LocalDateTime.now()
         ));
@@ -580,6 +583,7 @@ public class CatalogService {
                 passwordEncoder.encode(mutation.password()),
                 true,
                 UserRole.CUSTOMER,
+                100000L,
                 now,
                 now
         ));
@@ -599,6 +603,7 @@ public class CatalogService {
                 created.passwordHash(),
                 created.active(),
                 created.role(),
+                created.nextSampleNumber(),
                 created.createdAt(),
                 created.updatedAt()
         ));
@@ -830,6 +835,7 @@ public class CatalogService {
                         user.passwordHash(),
                         user.active(),
                         normalizeStoredRole(user.role()),
+                        user.nextSampleNumber(),
                         user.createdAt(),
                         now
                 )));
@@ -864,6 +870,7 @@ public class CatalogService {
                 passwordEncoder.encode(rawPassword),
                 true,
                 role,
+                100000L,
                 now,
                 now
         ));