diff --git a/modules/store/src/main/scala/de/nowchess/store/config/GameWritebackEventDtoMixin.scala b/modules/store/src/main/scala/de/nowchess/store/config/GameWritebackEventDtoMixin.scala
new file mode 100644
index 0000000..eb446dc
--- /dev/null
+++ b/modules/store/src/main/scala/de/nowchess/store/config/GameWritebackEventDtoMixin.scala
@@ -0,0 +1,10 @@
+package de.nowchess.store.config
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+
+abstract class GameWritebackEventDtoMixin:
+  @JsonDeserialize(contentAs = classOf[java.lang.Long]) val whiteRemainingMs: Option[Long]
+  @JsonDeserialize(contentAs = classOf[java.lang.Long]) val blackRemainingMs: Option[Long]
+  @JsonDeserialize(contentAs = classOf[java.lang.Long]) val incrementMs: Option[Long]
+  @JsonDeserialize(contentAs = classOf[java.lang.Long]) val clockLastTickAt: Option[Long]
+  @JsonDeserialize(contentAs = classOf[java.lang.Long]) val clockMoveDeadline: Option[Long]
diff --git a/modules/store/src/main/scala/de/nowchess/store/config/JacksonConfig.scala b/modules/store/src/main/scala/de/nowchess/store/config/JacksonConfig.scala
index 5042bb2..d0d2f7a 100644
--- a/modules/store/src/main/scala/de/nowchess/store/config/JacksonConfig.scala
+++ b/modules/store/src/main/scala/de/nowchess/store/config/JacksonConfig.scala
@@ -3,6 +3,7 @@ package de.nowchess.store.config
 import com.fasterxml.jackson.core.Version
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.module.scala.DefaultScalaModule
+import de.nowchess.api.dto.GameWritebackEventDto
 import io.quarkus.jackson.ObjectMapperCustomizer
 import jakarta.inject.Singleton
 
@@ -15,3 +16,4 @@ class JacksonConfig extends ObjectMapperCustomizer:
         new Version(2, 21, 1, null, "com.fasterxml.jackson.module", "jackson-module-scala")
         // scalafix:on DisableSyntax.null
     })
+    mapper.addMixIn(classOf[GameWritebackEventDto], classOf[GameWritebackEventDtoMixin])