diff --git a/src/Entity/Groups/AccommodationPrice.php b/src/Entity/Groups/AccommodationPrice.php
index 0a6a676..751d07c 100644
--- a/src/Entity/Groups/AccommodationPrice.php
+++ b/src/Entity/Groups/AccommodationPrice.php
@@ -6,6 +6,7 @@ use App\Entity\BlameableEntity;
 use App\Entity\BlameableEntityInterface;
 use App\Entity\TimestampableEntity;
 use App\Entity\TimestampableEntityInterface;
+use App\Entity\TimestampableParentAwareInterface;
 use App\Enum\Groups\PriceType;
 use App\Enum\Groups\Season;
 use App\Repository\Groups\AccommodationPriceRepository;
@@ -14,7 +15,7 @@ use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
 #[ORM\Entity(repositoryClass: AccommodationPriceRepository::class)]
-class AccommodationPrice implements BlameableEntityInterface, TimestampableEntityInterface
+class AccommodationPrice implements BlameableEntityInterface, TimestampableEntityInterface, TimestampableParentAwareInterface
 {
     use BlameableEntity;
     use TimestampableEntity;
@@ -89,6 +90,11 @@ class AccommodationPrice implements BlameableEntityInterface, TimestampableEntit
         return $this;
     }
 
+    public function getTimestampableParent(): ?TimestampableEntityInterface
+    {
+        return $this->accommodation;
+    }
+
     public function getDateFrom(): ?\DateTimeImmutable
     {
         return $this->dateFrom;
diff --git a/src/Entity/Groups/AdditionalService.php b/src/Entity/Groups/AdditionalService.php
index 7cdba23..7f6dc34 100644
--- a/src/Entity/Groups/AdditionalService.php
+++ b/src/Entity/Groups/AdditionalService.php
@@ -6,6 +6,7 @@ use App\Entity\BlameableEntity;
 use App\Entity\BlameableEntityInterface;
 use App\Entity\TimestampableEntity;
 use App\Entity\TimestampableEntityInterface;
+use App\Entity\TimestampableParentAwareInterface;
 use App\Enum\Groups\AdditionalServiceType;
 use App\Repository\Groups\AdditionalServiceRepository;
 use Doctrine\DBAL\Types\Types;
@@ -13,7 +14,7 @@ use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
 #[ORM\Entity(repositoryClass: AdditionalServiceRepository::class)]
-class AdditionalService implements BlameableEntityInterface, TimestampableEntityInterface
+class AdditionalService implements BlameableEntityInterface, TimestampableEntityInterface, TimestampableParentAwareInterface
 {
     use BlameableEntity;
     use TimestampableEntity;
@@ -87,6 +88,11 @@ class AdditionalService implements BlameableEntityInterface, TimestampableEntity
         return $this;
     }
 
+    public function getTimestampableParent(): ?TimestampableEntityInterface
+    {
+        return $this->accommodation;
+    }
+
     public function getLabel(): ?string
     {
         return $this->label;
diff --git a/src/Entity/Groups/BoardService.php b/src/Entity/Groups/BoardService.php
index bbcc5eb..20b9839 100644
--- a/src/Entity/Groups/BoardService.php
+++ b/src/Entity/Groups/BoardService.php
@@ -6,13 +6,14 @@ use App\Entity\BlameableEntity;
 use App\Entity\BlameableEntityInterface;
 use App\Entity\TimestampableEntity;
 use App\Entity\TimestampableEntityInterface;
+use App\Entity\TimestampableParentAwareInterface;
 use App\Repository\Groups\BoardServiceRepository;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 
 #[ORM\Entity(repositoryClass: BoardServiceRepository::class)]
-class BoardService implements BlameableEntityInterface, TimestampableEntityInterface
+class BoardService implements BlameableEntityInterface, TimestampableEntityInterface, TimestampableParentAwareInterface
 {
     use BlameableEntity;
     use TimestampableEntity;
@@ -67,6 +68,11 @@ class BoardService implements BlameableEntityInterface, TimestampableEntityInter
         return $this;
     }
 
+    public function getTimestampableParent(): ?TimestampableEntityInterface
+    {
+        return $this->accommodation;
+    }
+
     public function getLabel(): ?string
     {
         return $this->label;
diff --git a/src/Entity/TimestampableParentAwareInterface.php b/src/Entity/TimestampableParentAwareInterface.php
new file mode 100644
index 0000000..4802998
--- /dev/null
+++ b/src/Entity/TimestampableParentAwareInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Entity;
+
+interface TimestampableParentAwareInterface
+{
+    /**
+     * The entity whose updatedAt should be bumped whenever this entity is created, changed or removed.
+     */
+    public function getTimestampableParent(): ?TimestampableEntityInterface;
+}
diff --git a/src/EventListener/TimestampableEntityListener.php b/src/EventListener/TimestampableEntityListener.php
index 02d7c7b..3ee332e 100644
--- a/src/EventListener/TimestampableEntityListener.php
+++ b/src/EventListener/TimestampableEntityListener.php
@@ -3,13 +3,16 @@
 namespace App\EventListener;
 
 use App\Entity\TimestampableEntityInterface;
+use App\Entity\TimestampableParentAwareInterface;
 use Doctrine\Bundle\DoctrineBundle\Attribute\AsDoctrineListener;
+use Doctrine\ORM\Event\OnFlushEventArgs;
 use Doctrine\ORM\Event\PrePersistEventArgs;
 use Doctrine\ORM\Event\PreUpdateEventArgs;
 use Doctrine\ORM\Events;
 
 #[AsDoctrineListener(Events::prePersist)]
 #[AsDoctrineListener(Events::preUpdate)]
+#[AsDoctrineListener(Events::onFlush)]
 class TimestampableEntityListener
 {
     public function prePersist(PrePersistEventArgs $args): void
@@ -31,4 +34,55 @@ class TimestampableEntityListener
             $entity->setUpdatedAt($now);
         }
     }
+
+    /**
+     * Doctrine has no notion of "collection member changed, so the owner changed". Entities that
+     * only make sense as part of their parent therefore push their own changes upwards, so the
+     * parent's updatedAt reflects the last change to the aggregate as a whole.
+     */
+    public function onFlush(OnFlushEventArgs $args): void
+    {
+        $entityManager = $args->getObjectManager();
+        $unitOfWork = $entityManager->getUnitOfWork();
+
+        $scheduled = [
+            ...$unitOfWork->getScheduledEntityInsertions(),
+            ...$unitOfWork->getScheduledEntityUpdates(),
+            ...$unitOfWork->getScheduledEntityDeletions(),
+        ];
+
+        /** @var array<int, TimestampableEntityInterface> $parents */
+        $parents = [];
+
+        foreach ($scheduled as $entity) {
+            if (!$entity instanceof TimestampableParentAwareInterface) {
+                continue;
+            }
+
+            $parent = $entity->getTimestampableParent();
+
+            // A parent created in this very flush already gets its createdAt, and one being
+            // removed must not be resurrected by an update.
+            if (null === $parent
+                || $unitOfWork->isScheduledForInsert($parent)
+                || $unitOfWork->isScheduledForDelete($parent)) {
+                continue;
+            }
+
+            $parents[spl_object_id($parent)] = $parent;
+        }
+
+        $now = new \DateTimeImmutable();
+
+        foreach ($parents as $parent) {
+            $parent->setUpdatedAt($now);
+
+            // Registers the parent as an update even when it had no changeset of its own. The
+            // preUpdate listeners run afterwards, so updatedBy stays in sync with updatedAt.
+            $unitOfWork->recomputeSingleEntityChangeSet(
+                $entityManager->getClassMetadata($parent::class),
+                $parent,
+            );
+        }
+    }
 }