src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java

@@ -17,7 +17,7 @@ public class JsonObjectMapperConfiguration {
     public Jackson2ObjectMapperBuilder customObjectMapper() {
         return new Jackson2ObjectMapperBuilder()
                 .modules(new JsonNullableModule(), new JavaTimeModule())
-                .featuresToEnable(JsonParser.Feature.ALLOW_COMMENTS)
+                .featuresToEnable(JsonParser.Feature.ALLOW_COMMENTS, JsonParser.Feature.ALLOW_COMMENTS)
                 .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
     }
 }

src/main/java/net/hostsharing/hsadminng/hash/HashGenerator.java

@@ -27,7 +27,7 @@ public final class HashGenerator {
             "abcdefghijklmnopqrstuvwxyz" +
                     "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
                     "0123456789/.";
-    private static boolean couldBeHashEnabled; // TODO.impl: remove after legacy data is migrated
+    private static boolean couldBeHashEnabled; // TODO.legacy: remove after legacy data is migrated
 
     public enum Algorithm {
         LINUX_SHA512(LinuxEtcShadowHashGenerator::hash, "6"),

src/main/java/net/hostsharing/hsadminng/hs/booking/item/BookingItemCreatedEvent.java

@@ -4,13 +4,57 @@ import lombok.Getter;
 import org.springframework.context.ApplicationEvent;
 
 import jakarta.validation.constraints.NotNull;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
 
 @Getter
 public class BookingItemCreatedEvent extends ApplicationEvent {
-    private final @NotNull HsBookingItem newBookingItem;
 
-    public BookingItemCreatedEvent(@NotNull HsBookingItemController source, @NotNull final HsBookingItem newBookingItem) {
+    private static final Map<UUID, BookingItemCreatedEvent> events = new HashMap<>(); // FIXME: use DB table
+
+    static BookingItemCreatedEvent of(final HsBookingItemRealEntity bookingItem) {
+        return events.get(bookingItem.getUuid());
+    }
+
+    @Getter
+    public static class Status {
+
+        private final String message;
+
+        private Status(final String message) {
+            this.message = message;
+        }
+
+        public static Status finished() {
+            return new Status(null);
+        }
+
+        public static Status failed(final String errorMessage) {
+            return new Status(errorMessage);
+        }
+
+        boolean isFinished() {
+            return message == null;
+        }
+    }
+
+    private final @NotNull UUID bookingItemUuid;
+    private final @NotNull String assetJson;
+
+    private Status status;
+
+    public BookingItemCreatedEvent(
+            @NotNull final HsBookingItemController source,
+            @NotNull final HsBookingItem newBookingItem,
+            final String assetJson) {
         super(source);
-        this.newBookingItem = newBookingItem;
+        this.bookingItemUuid = newBookingItem.getUuid();
+        this.assetJson = assetJson;
+    }
+
+    public void setStatus(final Status status) {
+        this.status = status;
+        events.put(bookingItemUuid, this);
     }
 }

src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java

@@ -1,5 +1,7 @@
 package net.hostsharing.hsadminng.hs.booking.item;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import net.hostsharing.hsadminng.context.Context;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.api.HsBookingItemsApi;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemInsertResource;
@@ -40,6 +42,9 @@ public class HsBookingItemController implements HsBookingItemsApi {
     @Autowired
     private HsBookingItemRbacRepository bookingItemRepo;
 
+    @Autowired
+    private ObjectMapper jsonMapper;
+
     @Autowired
     private EntityManagerWrapper em;
 
@@ -77,7 +82,12 @@ public class HsBookingItemController implements HsBookingItemsApi {
                 .mapUsing(e -> mapper.map(e, HsBookingItemResource.class, ITEM_TO_RESOURCE_POSTMAPPER))
                 .revampProperties();
 
-        applicationEventPublisher.publishEvent(new BookingItemCreatedEvent(this, saveProcessor.getEntity()));
+        try {
+            applicationEventPublisher.publishEvent(new BookingItemCreatedEvent(
+                    this, saveProcessor.getEntity(), jsonMapper.writeValueAsString(body.getAsset())));
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
 
         final var uri =
                 MvcUriComponentsBuilder.fromController(getClass())

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/BookingItemEntitySaveProcessor.java

@@ -48,7 +48,7 @@ public class BookingItemEntitySaveProcessor {
         return this;
     }
 
-    // TODO.impl: remove once the migration of legacy data is done
+    // TODO.legacy: remove once the migration of legacy data is done
     /// validates the entity itself including its properties, but ignoring some error messages for import of legacy data
     public BookingItemEntitySaveProcessor validateEntityIgnoring(final String... ignoreRegExp) {
         step("validateEntity", "prepareForSave");

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsDomainSetupBookingItemValidator.java

@@ -1,39 +1,30 @@
 
 package net.hostsharing.hsadminng.hs.booking.item.validators;
 
-import net.hostsharing.hsadminng.hs.booking.item.HsBookingItem;
 import net.hostsharing.hsadminng.hs.validation.PropertiesProvider;
 
 import jakarta.persistence.EntityManager;
 import java.security.SecureRandom;
-import java.util.ArrayList;
-import java.util.List;
 
 import static net.hostsharing.hsadminng.hs.hosting.asset.validators.Dns.REGISTRAR_LEVEL_DOMAINS;
 import static net.hostsharing.hsadminng.hs.validation.StringProperty.stringProperty;
 
 class HsDomainSetupBookingItemValidator extends HsBookingItemEntityValidator {
+    public static final String DOMAIN_NAME_PROPERTY_NAME = "domainName";
 
     public static final String FQDN_REGEX = "^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\\.)+[A-Za-z]{2,12}";
-    public static final String DOMAIN_NAME_PROPERTY_NAME = "domainName";
-    public static final String TARGET_UNIX_USER_PROPERTY_NAME = "targetUnixUser";
     public static final String WEBSPACE_NAME_REGEX = "[a-z][a-z0-9]{2}[0-9]{2}";
     public static final String TARGET_UNIX_USER_NAME_REGEX = "^"+WEBSPACE_NAME_REGEX+"$|^"+WEBSPACE_NAME_REGEX+"-[a-z0-9\\._-]+$";
     public static final String VERIFICATION_CODE_PROPERTY_NAME = "verificationCode";
 
     HsDomainSetupBookingItemValidator() {
         super(
+                // TODO.spec: feels wrong
                 stringProperty(DOMAIN_NAME_PROPERTY_NAME).writeOnce()
                         .maxLength(253)
                         .matchesRegEx(FQDN_REGEX).describedAs("is not a (non-top-level) fully qualified domain name")
                         .notMatchesRegEx(REGISTRAR_LEVEL_DOMAINS).describedAs("is a forbidden registrar-level domain name")
                         .required(),
-                // TODO.legacy: remove the following property once we give up legacy compatibility
-                stringProperty(TARGET_UNIX_USER_PROPERTY_NAME).writeOnce()
-                        .maxLength(253)
-                        .matchesRegEx(TARGET_UNIX_USER_NAME_REGEX).describedAs("is not a valid unix-user name")
-                        .writeOnce()
-                        .required(),
                 stringProperty(VERIFICATION_CODE_PROPERTY_NAME)
                         .minLength(12)
                         .maxLength(64)
@@ -41,19 +32,6 @@ class HsDomainSetupBookingItemValidator extends HsBookingItemEntityValidator {
         );
     }
 
-    @Override
-    public List<String> validateEntity(final HsBookingItem bookingItem) {
-        final var violations = new ArrayList<String>();
-        final var domainName = bookingItem.getDirectValue(DOMAIN_NAME_PROPERTY_NAME, String.class);
-        if (!bookingItem.isLoaded() &&
-                domainName.matches("hostsharing.(com|net|org|coop|de)")) {
-            violations.add("'" + bookingItem.toShortString() + ".resources." + DOMAIN_NAME_PROPERTY_NAME + "' = '" + domainName
-                    + "' is a forbidden Hostsharing domain name");
-        }
-        violations.addAll(super.validateEntity(bookingItem));
-        return violations;
-    }
-
     private static String generateVerificationCode(final EntityManager em, final PropertiesProvider propertiesProvider) {
         final var userDefinedVerificationCode = propertiesProvider.getDirectValue(VERIFICATION_CODE_PROPERTY_NAME, String.class);
         if (userDefinedVerificationCode != null) {

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsBookingItemCreatedListener.java

@@ -1,14 +1,31 @@
 package net.hostsharing.hsadminng.hs.hosting.asset;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.SneakyThrows;
+import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsHostingAssetAutoInsertResource;
+import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsHostingAssetTypeResource;
 import net.hostsharing.hsadminng.hs.booking.item.BookingItemCreatedEvent;
+import net.hostsharing.hsadminng.hs.booking.item.BookingItemCreatedEvent.Status;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRealEntity;
 import net.hostsharing.hsadminng.hs.hosting.asset.validators.HostingAssetEntitySaveProcessor;
+import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactRealEntity;
+import net.hostsharing.hsadminng.mapper.StandardMapper;
 import net.hostsharing.hsadminng.persistence.EntityManagerWrapper;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.ApplicationListener;
 import org.springframework.stereotype.Component;
 
-import java.util.List;
+import jakarta.validation.ValidationException;
+import java.net.IDN;
+import java.util.Map;
+import java.util.UUID;
+
+import static java.util.Map.entry;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_DNS_SETUP;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_HTTP_SETUP;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_MBOX_SETUP;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.DOMAIN_SMTP_SETUP;
 
 @Component
 public class HsBookingItemCreatedListener implements ApplicationListener<BookingItemCreatedEvent> {
@@ -16,41 +33,143 @@ public class HsBookingItemCreatedListener implements ApplicationListener<Booking
     @Autowired
     private EntityManagerWrapper emw;
 
+    @Autowired
+    private ObjectMapper jsonMapper;
+
+    @Autowired
+    private StandardMapper standardMapper;
+
     @Override
+    @SneakyThrows
     public void onApplicationEvent(final BookingItemCreatedEvent event) {
-        System.out.println("Received newly created booking item: " + event.getNewBookingItem());
         final var newBookingItemRealEntity =
-                emw.getReference(HsBookingItemRealEntity.class, event.getNewBookingItem().getUuid());
-        final var newHostingAsset = switch (newBookingItemRealEntity.getType()) {
+                emw.getReference(HsBookingItemRealEntity.class, event.getBookingItemUuid());
+        final var asset = jsonMapper.readValue(event.getAssetJson(), HsHostingAssetAutoInsertResource.class);
+        final var factory = switch (newBookingItemRealEntity.getType()) {
             case PRIVATE_CLOUD -> null;
             case CLOUD_SERVER -> null;
             case MANAGED_SERVER -> null;
             case MANAGED_WEBSPACE -> null;
-            case DOMAIN_SETUP -> createDomainSetupHostingAsset(newBookingItemRealEntity);
+            case DOMAIN_SETUP -> new DomainSetupHostingAssetFactory(newBookingItemRealEntity, asset);
         };
-        if (newHostingAsset != null) {
-            try {
-                new HostingAssetEntitySaveProcessor(emw, newHostingAsset)
-                        .preprocessEntity()
-                        .validateEntity()
-                        .prepareForSave()
-                        .save()
-                        .validateContext();
-            } catch (final Exception e) {
-                // TODO.impl: store status in a separate field, maybe enum+message
-                newBookingItemRealEntity.getResources().put("status", e.getMessage());
-            }
+        if (factory != null) {
+            event.setStatus(factory.performSaveProcess());
         }
     }
 
-    private HsHostingAsset createDomainSetupHostingAsset(final HsBookingItemRealEntity fromBookingItem) {
-        return HsHostingAssetRbacEntity.builder()
-                .bookingItem(fromBookingItem)
-                .type(HsHostingAssetType.DOMAIN_SETUP)
-                .identifier(fromBookingItem.getDirectValue("domainName", String.class))
-                .subHostingAssets(List.of(
-                        // TARGET_UNIX_USER_PROPERTY_NAME
-                ))
-                .build();
+    private <T> T ref(final Class<T> entityClass, final UUID uuid) {
+        return uuid != null ? emw.getReference(entityClass, uuid) : null;
+    }
+
+    @RequiredArgsConstructor
+    abstract class HostingAssetFactory {
+
+        final HsBookingItemRealEntity fromBookingItem;
+        final HsHostingAssetAutoInsertResource asset;
+
+        protected HsHostingAsset create() {
+            return null;
+        }
+
+        Status performSaveProcess() {
+            final var newHostingAsset = create();
+            try {
+                return persist(newHostingAsset);
+            } catch (final Exception e) {
+                return Status.failed(e.getMessage());
+            }
+        }
+
+        protected Status persist(final HsHostingAsset newHostingAsset) {
+            new HostingAssetEntitySaveProcessor(emw, newHostingAsset)
+                    .preprocessEntity()
+                    .validateEntity()
+                    .prepareForSave()
+                    .save()
+                    .validateContext();
+            return Status.finished();
+        }
+    }
+
+    class DomainSetupHostingAssetFactory extends HostingAssetFactory {
+
+        public DomainSetupHostingAssetFactory(
+                final HsBookingItemRealEntity newBookingItemRealEntity,
+                final HsHostingAssetAutoInsertResource asset) {
+            super(newBookingItemRealEntity, asset);
+        }
+
+        @Override
+        protected HsHostingAsset create() {
+            final String domainName = asset.getIdentifier();
+            final var domainSetupAsset = createDomainSetupAsset(domainName);
+
+            // TODO.legacy: as long as we need to be compatible, we always do all technical domain-setups
+            final var subHostingAssetResources = asset.getSubHostingAssets();
+            final var domainHttpSetupAssetResource = subHostingAssetResources.stream()
+                    .filter(ha -> ha.getType() == HsHostingAssetTypeResource.DOMAIN_HTTP_SETUP)
+                    .findFirst().orElseThrow(() -> new ValidationException(
+                            domainName + ": missing target unix user (assignedToHostingAssetUuid) for DOMAIN_HTTP_SETUP "));
+            final var domainHttpSetupAsset = domainSetupAsset.getSubHostingAssets().stream().filter(sha -> sha.getType() == DOMAIN_HTTP_SETUP).findFirst().orElseThrow();
+            domainHttpSetupAsset.setParentAsset(domainSetupAsset);
+            final HsHostingAssetRealEntity assignedToUnixUserAsset =
+                    emw.find(HsHostingAssetRealEntity.class, domainHttpSetupAssetResource.getAssignedToAssetUuid());
+            domainHttpSetupAsset.setAssignedToAsset(assignedToUnixUserAsset);
+
+            if (subHostingAssetResources.stream().noneMatch(ha -> ha.getType() == HsHostingAssetTypeResource.DOMAIN_DNS_SETUP)) {
+                domainSetupAsset.getSubHostingAssets().add(HsHostingAssetRealEntity.builder()
+                        .type(DOMAIN_DNS_SETUP)
+                        .parentAsset(domainSetupAsset)
+                        .assignedToAsset(assignedToUnixUserAsset.getParentAsset()) // FIXME: why is that needed?
+                        .identifier(domainName + "|DNS")
+                        .config(Map.ofEntries(
+                                // FIXME:
+                                entry("TTL", 21600),
+                                entry("auto-SOA", true)
+                        ))
+                        .build());
+            }
+            if (subHostingAssetResources.stream().noneMatch(ha -> ha.getType() == HsHostingAssetTypeResource.DOMAIN_MBOX_SETUP)) {
+                domainSetupAsset.getSubHostingAssets().add(HsHostingAssetRealEntity.builder()
+                        .type(DOMAIN_MBOX_SETUP)
+                        .parentAsset(domainSetupAsset)
+                        .assignedToAsset(assignedToUnixUserAsset.getParentAsset())
+                        .identifier(domainName + "|MBOX")
+                        .caption("HTTP-Setup für " + IDN.toUnicode(domainName))
+                        .build());
+            }
+            if (subHostingAssetResources.stream().noneMatch(ha -> ha.getType() == HsHostingAssetTypeResource.DOMAIN_SMTP_SETUP)) {
+                domainSetupAsset.getSubHostingAssets().add(HsHostingAssetRealEntity.builder()
+                        .type(DOMAIN_SMTP_SETUP)
+                        .parentAsset(domainSetupAsset)
+                        .assignedToAsset(assignedToUnixUserAsset.getParentAsset())
+                        .identifier(domainName + "|SMTP")
+                        .caption("HTTP-Setup für " + IDN.toUnicode(domainName))
+                        .build());
+            }
+            return domainSetupAsset;
+        }
+
+        private HsHostingAssetRealEntity createDomainSetupAsset(final String domainName) {
+            return HsHostingAssetRealEntity.builder()
+                    .bookingItem(fromBookingItem)
+                    .type(HsHostingAssetType.DOMAIN_SETUP)
+                    .identifier(domainName)
+                    .caption(asset.getCaption() != null ? asset.getCaption() : domainName)
+                    .parentAsset(ref(HsHostingAssetRealEntity.class, asset.getParentAssetUuid()))
+                    .alarmContact(ref(HsOfficeContactRealEntity.class, asset.getAlarmContactUuid()))
+                    // FIXME .config(asset.getConfig())
+                    .subHostingAssets(
+                            standardMapper.mapList(asset.getSubHostingAssets(), HsHostingAssetRealEntity.class)
+                    )
+                    .build();
+        }
+
+        @Override
+        protected Status persist(final HsHostingAsset newHostingAsset) {
+            final var status = super.persist(newHostingAsset);
+            newHostingAsset.getSubHostingAssets().forEach(super::persist);
+            return status;
+        }
     }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetRealRepository.java

@@ -3,6 +3,7 @@ package net.hostsharing.hsadminng.hs.hosting.asset;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.Repository;
 
+import jakarta.validation.constraints.NotNull;
 import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
@@ -13,6 +14,18 @@ public interface HsHostingAssetRealRepository extends HsHostingAssetRepository<H
 
     List<HsHostingAssetRealEntity> findByIdentifier(String assetIdentifier);
 
+    default List<HsHostingAssetRealEntity> findByTypeAndIdentifier(@NotNull HsHostingAssetType type,  @NotNull String identifier) {
+        return findByTypeAndIdentifierImpl(type.name(), identifier);
+    }
+
+    @Query("""
+            select ha
+              from HsHostingAssetRealEntity ha
+             where cast(ha.type as String) = :type
+               and ha.identifier = :identifier
+            """)
+    List<HsHostingAssetRealEntity> findByTypeAndIdentifierImpl(@NotNull String type, @NotNull String identifier);
+
     @Query(value = """
         select ha.uuid,
                ha.alarmcontactuuid,

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HostingAssetEntitySaveProcessor.java

@@ -42,7 +42,7 @@ public class HostingAssetEntitySaveProcessor {
         return this;
     }
 
-    // TODO.impl: remove once the migration of legacy data is done
+    // TODO.legacy: remove once the migration of legacy data is done
     /// validates the entity itself including its properties, but ignoring some error messages for import of legacy data
     public HostingAssetEntitySaveProcessor validateEntityIgnoring(final String... ignoreRegExp) {
         step("validateEntity", "prepareForSave");

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsDomainDnsSetupHostingAssetValidator.java

@@ -15,7 +15,7 @@ import static net.hostsharing.hsadminng.hs.validation.BooleanProperty.booleanPro
 import static net.hostsharing.hsadminng.hs.validation.IntegerProperty.integerProperty;
 import static net.hostsharing.hsadminng.hs.validation.StringProperty.stringProperty;
 
-// TODO.impl: make package private once we've migrated the legacy data
+// TODO.legacy: make package private once we've migrated the legacy data
 public class HsDomainDnsSetupHostingAssetValidator extends HostingAssetEntityValidator {
 
     // according to  RFC 1035 (section 5) and RFC 1034
@@ -33,7 +33,7 @@ public class HsDomainDnsSetupHostingAssetValidator extends HostingAssetEntityVal
             RR_REGEX_NAME  + RR_REGEX_IN + RR_REGEX_TTL + RR_RECORD_TYPE + RR_RECORD_DATA + RR_COMMENT;
     public static final String IDENTIFIER_SUFFIX = "|DNS";
 
-    private static List<String> zoneFileErrors = null; // TODO.impl: remove once legacy data is migrated
+    private static List<String> zoneFileErrors = null; // TODO.legacy: remove once legacy data is migrated
 
     HsDomainDnsSetupHostingAssetValidator() {
         super(

src/main/java/net/hostsharing/hsadminng/hs/validation/PasswordProperty.java

@@ -31,7 +31,7 @@ public class PasswordProperty extends StringProperty<PasswordProperty> {
 
     @Override
     protected void validate(final List<String> result, final String propValue, final PropertiesProvider propProvider) {
-        // TODO.impl: remove after legacy data is migrated
+        // TODO.legacy: remove after legacy data is migrated
         if (HashGenerator.using(hashedUsing).couldBeHash(propValue) && propValue.length() > this.maxLength()) {
             // already hashed => do not validate
             return;

src/main/resources/api-definition/hs-booking/hs-booking-item-schemas.yaml

@@ -58,6 +58,17 @@ components:
                     nullable: false
                 type:
                     $ref: '#/components/schemas/HsBookingItemType'
+                identifier:
+                    type: string
+                    minLength: 3
+                    maxLength: 80
+                    nullable: false
+                    description: only used as a default value for automatically created hosting assets, not part of the booking item
+                assignedToHostingAssetUuid:
+                    type: string
+                    format: uuid
+                    nullable: false
+                    description: only used as a default value for automatically created hosting assets, not part of the booking item
                 caption:
                     type: string
                     minLength: 3
@@ -69,6 +80,8 @@ components:
                     nullable: true
                 resources:
                     $ref: '#/components/schemas/BookingResources'
+                asset:
+                    $ref: '../hs-hosting/hs-hosting-asset-schemas.yaml#/components/schemas/HsHostingAssetAutoInsert'
             required:
                 - caption
                 - projectUuid

src/main/resources/api-definition/hs-hosting/hs-hosting-asset-schemas.yaml

@@ -94,7 +94,68 @@ components:
                 - type
                 - identifier
                 - caption
-                - config
+            additionalProperties: false
+
+        HsHostingAssetAutoInsert:
+            type: object
+            properties:
+                parentAssetUuid:
+                    type: string
+                    format: uuid
+                    nullable: true
+                assignedToAssetUuid:
+                    type: string
+                    format: uuid
+                type:
+                    $ref: '#/components/schemas/HsHostingAssetType'
+                identifier:
+                    type: string
+                    minLength: 3
+                    maxLength: 80
+                    nullable: false
+                caption:
+                    type: string
+                    minLength: 3
+                    maxLength: 80
+                    nullable: false
+                alarmContactUuid:
+                    type: string
+                    format: uuid
+                    nullable: true
+                config:
+                    $ref: '#/components/schemas/HsHostingAssetConfiguration'
+                subHostingAssets:
+                    type: array
+                    items:
+                        $ref: '#/components/schemas/HsHostingAssetSubInsert'
+            required:
+                - identifier
+            additionalProperties: false
+
+        HsHostingAssetSubInsert:
+            type: object
+            properties:
+                assignedToAssetUuid:
+                    type: string
+                    format: uuid
+                type:
+                    $ref: '#/components/schemas/HsHostingAssetType'
+                identifier:
+                    type: string
+                    minLength: 3
+                    maxLength: 80
+                    nullable: false
+                caption:
+                    type: string
+                    minLength: 3
+                    maxLength: 80
+                    nullable: false
+                alarmContactUuid:
+                    type: string
+                    format: uuid
+                    nullable: true
+                config:
+                    $ref: '#/components/schemas/HsHostingAssetConfiguration'
             additionalProperties: false
 
         HsHostingAssetConfiguration:

src/main/resources/db/changelog/5-hs-office/501-contact/5016-hs-office-contact-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/main/resources/db/changelog/5-hs-office/504-partner/5046-hs-office-partner-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/main/resources/db/changelog/5-hs-office/507-sepamandate/5076-hs-office-sepamandate-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/main/resources/db/changelog/5-hs-office/511-coopshares/5116-hs-office-coopshares-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/main/resources/db/changelog/5-hs-office/512-coopassets/5126-hs-office-coopassets-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/main/resources/db/changelog/7-hs-hosting/701-hosting-asset/7010-hs-hosting-asset.sql

@@ -41,7 +41,7 @@ create table if not exists hs_hosting.asset
     config              jsonb not null,
     alarmContactUuid    uuid null references hs_office.contact(uuid) initially deferred,
 
-    unique (type, identifier), -- at least as long as we need to be compatible to the legacy system
+    unique (type, identifier), -- TODO.legacy: at least as long as we need to be compatible to the legacy system
 
     constraint hosting_asset_has_booking_item_or_parent_asset
         check (bookingItemUuid is not null or parentAssetUuid is not null or type in ('DOMAIN_SETUP', 'IPV4_NUMBER', 'IPV6_NUMBER'))

src/main/resources/db/changelog/7-hs-hosting/701-hosting-asset/7016-hs-hosting-asset-migration.sql

@@ -1,6 +1,6 @@
 --liquibase formatted sql
 
--- TODO: These changesets are just for the external remote views to simulate the legacy tables.
+-- TODO.legacy: These changesets are just for the external remote views to simulate the legacy tables.
 --  Once we don't need the external remote views anymore, create revert changesets.
 
 -- ============================================================================

src/test/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemControllerAcceptanceTest.java

@@ -5,12 +5,14 @@ import io.restassured.RestAssured;
 import io.restassured.http.ContentType;
 import net.hostsharing.hsadminng.HsadminNgApplication;
 import net.hostsharing.hsadminng.hs.booking.debitor.HsBookingDebitorRepository;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectRealEntity;
 import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectRealRepository;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAsset;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetRealRepository;
 import net.hostsharing.hsadminng.hs.hosting.asset.validators.Dns;
 import net.hostsharing.hsadminng.rbac.test.ContextBasedTestWithCleanup;
 import net.hostsharing.hsadminng.rbac.test.JpaAttempt;
+import org.jetbrains.annotations.NotNull;
 import org.junit.jupiter.api.ClassOrderer;
 import org.junit.jupiter.api.MethodOrderer;
 import org.junit.jupiter.api.Nested;
@@ -31,6 +33,7 @@ import java.util.UUID;
 import static java.util.Map.entry;
 import static java.util.Optional.ofNullable;
 import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType.MANAGED_WEBSPACE;
+import static net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType.UNIX_USER;
 import static net.hostsharing.hsadminng.rbac.test.JsonMatcher.lenientlyEquals;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.Matchers.matchesRegex;
@@ -70,11 +73,7 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
 
             // given
             context("superuser-alex@hostsharing.net");
-            final var givenProject = debitorRepo.findByDebitorNumber(1000111).stream()
-                            .map(d -> realProjectRepo.findAllByDebitorUuid(d.getUuid()))
-                            .flatMap(List::stream)
-                            .findFirst()
-                            .orElseThrow();
+            final var givenProject = findDefaultProjectOfDebitorNumber(1000111);
 
             RestAssured // @formatter:off
                 .given()
@@ -138,11 +137,7 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
         void globalAdmin_canAddBookingItem() {
 
             context.define("superuser-alex@hostsharing.net");
-            final var givenProject = debitorRepo.findByDebitorNumber(1000111).stream()
-                    .map(d -> realProjectRepo.findAllByDebitorUuid(d.getUuid()))
-                    .flatMap(List::stream)
-                    .findFirst()
-                    .orElseThrow();
+            final var givenProject = findDefaultProjectOfDebitorNumber(1000111);
 
             final var location = RestAssured // @formatter:off
                     .given()
@@ -189,34 +184,41 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
         void projectAgent_canAddBookingItemWithHostingAsset() {
 
             context.define("superuser-alex@hostsharing.net", "hs_booking.project#D-1000111-D-1000111defaultproject:AGENT");
-            final var givenProject = debitorRepo.findByDebitorNumber(1000111).stream()
-                    .map(d -> realProjectRepo.findAllByDebitorUuid(d.getUuid()))
-                    .flatMap(List::stream)
-                    .findFirst()
-                    .orElseThrow();
+            final var givenProject = findDefaultProjectOfDebitorNumber(1000111);
+            final var givenUnixUser = realHostingAssetRepo.findByTypeAndIdentifier(UNIX_USER, "fir01-web").stream()
+                    .findFirst().orElseThrow();
 
             Dns.fakeResultForDomain("example.org",
                     Dns.Result.fromRecords("Hostsharing-domain-setup-verification-code=just-a-fake-verification-code"));
 
             final var location = RestAssured // @formatter:off
                     .given()
-                    .header("current-subject", "superuser-alex@hostsharing.net")
-                    .contentType(ContentType.JSON)
-                    .body("""
-                            {
-                                "projectUuid": "{projectUuid}",
-                                "type": "DOMAIN_SETUP",
-                                "caption": "some new domain-setup booking",
-                                "resources": {
-                                    "domainName": "example.org",
-                                    "targetUnixUser": "fir01-web",
-                                    "verificationCode": "just-a-fake-verification-code"
+                        .header("current-subject", "superuser-alex@hostsharing.net")
+                        .contentType(ContentType.JSON)
+                        .body("""
+                                {
+                                    "projectUuid": "{projectUuid}",
+                                    "type": "DOMAIN_SETUP",
+                                    "caption": "Domain-Setup for example.org",
+                                    "resources": {
+                                        "domainName": "example.org",
+                                        "verificationCode": "just-a-fake-verification-code"
+                                    },
+                                    "asset": { // FIXME: rename to hostingAsset
+                                        "identifier": "example.org", // also as default for all subAssets
+                                        "subHostingAssets": [
+                                            {
+                                                "type": "DOMAIN_HTTP_SETUP",
+                                                "assignedToAssetUuid": "{unixUserUuid}"
+                                            }
+                                        ]
+                                    }
                                 }
-                            }
-                            """
-                            .replace("{projectUuid}", givenProject.getUuid().toString())
-                    )
-                    .port(port)
+                                """
+                                .replace("{projectUuid}", givenProject.getUuid().toString())
+                                .replace("{unixUserUuid}", givenUnixUser.getUuid().toString())
+                        )
+                        .port(port)
                     .when()
                         .post("http://localhost/api/hs/booking/items")
                     .then().log().all().assertThat()
@@ -225,10 +227,9 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
                         .body("", lenientlyEquals("""
                                 {
                                     "type": "DOMAIN_SETUP",
-                                    "caption": "some new domain-setup booking",
+                                    "caption": "Domain-Setup for example.org",
                                     "validFrom": "{today}",
-                                    "validTo": null,
-                                    "resources": { "domainName": "example.org", "targetUnixUser": "fir01-web" }
+                                    "validTo": null
                                  }
                                 """
                                 .replace("{today}", LocalDate.now().toString())
@@ -240,24 +241,37 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
             // then, the new BookingItem can be accessed under the generated UUID
             final var newBookingItem = fetchRealBookingItemFromURI(location);
             assertThat(newBookingItem)
-                    .extracting(bi -> bi.getDirectValue("domainName", String.class))
-                    .isEqualTo("example.org");
+                    .extracting(HsBookingItem::getCaption)
+                    .isEqualTo("Domain-Setup for example.org");
 
-            // and the related HostingAsset also got created
-            assertThat(realHostingAssetRepo.findByIdentifier("example.org")).isNotEmpty()
+            // and the related HostingAssets are also got created
+            final var domainSetupHostingAsset = realHostingAssetRepo.findByIdentifier("example.org");
+            assertThat(domainSetupHostingAsset).isNotEmpty()
                     .map(HsHostingAsset::getBookingItem)
                     .contains(newBookingItem);
+            assertThat(realHostingAssetRepo.findByIdentifier("example.org|DNS")).isNotEmpty()
+                    .map(HsHostingAsset::getParentAsset)
+                    .isEqualTo(domainSetupHostingAsset);
+            assertThat(realHostingAssetRepo.findByIdentifier("example.org|HTTP")).isNotEmpty()
+                    .map(HsHostingAsset::getParentAsset)
+                    .isEqualTo(domainSetupHostingAsset);
+            assertThat(realHostingAssetRepo.findByIdentifier("example.org|MBOX")).isNotEmpty()
+                    .map(HsHostingAsset::getParentAsset)
+                    .isEqualTo(domainSetupHostingAsset);
+            assertThat(realHostingAssetRepo.findByIdentifier("example.org|SMTP")).isNotEmpty()
+                    .map(HsHostingAsset::getParentAsset)
+                    .isEqualTo(domainSetupHostingAsset);
+            final var status = BookingItemCreatedEvent.of(newBookingItem);
+            assertThat(status.getStatus().isFinished());
+
         }
 
         @Test
         void projectAgent_canAddBookingItemEvenIfHostingAssetCreationFails() {
 
             context.define("superuser-alex@hostsharing.net", "hs_booking.project#D-1000111-D-1000111defaultproject:AGENT");
-            final var givenProject = debitorRepo.findByDebitorNumber(1000111).stream()
-                    .map(d -> realProjectRepo.findAllByDebitorUuid(d.getUuid()))
-                    .flatMap(List::stream)
-                    .findFirst()
-                    .orElseThrow();
+            final var givenProject = findDefaultProjectOfDebitorNumber(1000111);
+            final var givenUnixUser = realHostingAssetRepo.findByIdentifier("fir01-web").stream().findFirst().orElseThrow();
 
             Dns.fakeResultForDomain("example.org", Dns.Result.fromRecords()); // without valid verificationCode
 
@@ -272,12 +286,21 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
                                     "caption": "some new domain-setup booking",
                                     "resources": {
                                         "domainName": "example.org",
-                                        "targetUnixUser": "fir01-web",
                                         "verificationCode": "just-a-fake-verification-code"
+                                    },
+                                    "asset": { // FIXME: rename to hostingAsset
+                                        "identifier": "example.org", // also as default for all subAssets
+                                        "subHostingAssets": [
+                                            {
+                                                "type": "DOMAIN_HTTP_SETUP",
+                                                "assignedToAssetUuid": "{unixUserUuid}"
+                                            }
+                                        ]
                                     }
                                 }
                                 """
                                 .replace("{projectUuid}", givenProject.getUuid().toString())
+                                .replace("{unixUserUuid}", givenUnixUser.getUuid().toString())
                         )
                         .port(port)
                     .when()
@@ -291,7 +314,7 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
                                     "caption": "some new domain-setup booking",
                                     "validFrom": "{today}",
                                     "validTo": null,
-                                    "resources": { "domainName": "example.org", "targetUnixUser": "fir01-web" }
+                                    "resources": { "domainName": "example.org" }
                                  }
                                 """
                                 .replace("{today}", LocalDate.now().toString())
@@ -305,8 +328,8 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
             assertThat(newBookingItem)
                     .extracting(bi -> bi.getDirectValue("domainName", String.class))
                     .isEqualTo("example.org");
-            assertThat(newBookingItem)
-                    .extracting(bi -> bi.getDirectValue("status", String.class))
+            final var status = BookingItemCreatedEvent.of(newBookingItem);
+            assertThat(status.getStatus().getMessage())
                     .isEqualTo("[[DNS] no TXT record 'Hostsharing-domain-setup-verification-code=just-a-fake-verification-code' found for domain name 'example.org' (nor in its super-domain)]");
 
             // but the related HostingAsset did not get created
@@ -314,6 +337,14 @@ class HsBookingItemControllerAcceptanceTest extends ContextBasedTestWithCleanup
         }
     }
 
+    private @NotNull HsBookingProjectRealEntity findDefaultProjectOfDebitorNumber(final int debitorNumber) {
+        return debitorRepo.findByDebitorNumber(debitorNumber).stream()
+                .map(d -> realProjectRepo.findAllByDebitorUuid(d.getUuid()))
+                .flatMap(List::stream)
+                .findFirst()
+                .orElseThrow();
+    }
+
     @Nested
     @Order(1)
     @TestMethodOrder(MethodOrderer.OrderAnnotation.class)

src/test/java/net/hostsharing/hsadminng/hs/migration/BaseOfficeDataImport.java

@@ -502,7 +502,7 @@ public abstract class BaseOfficeDataImport extends CsvDataImport {
         // this happens if a natural person is marked as 'contractual' for itself
         final var idsToRemove = new HashSet<Integer>();
         relations.forEach((id, r) -> {
-            if (r.getHolder() == r.getAnchor()) {
+            if (r.getType() == HsOfficeRelationType.REPRESENTATIVE && r.getHolder() == r.getAnchor()) {
                 idsToRemove.add(id);
             }
         });