diff --git a/modules/api/build.gradle.kts b/modules/api/build.gradle.kts
index 311b187..faba907 100644
--- a/modules/api/build.gradle.kts
+++ b/modules/api/build.gradle.kts
@@ -49,6 +49,7 @@ dependencies {
             strictly(versions["SCALA_LIBRARY"]!!)
         }
     }
+    implementation("com.fasterxml.jackson.databind:jackson-databind:${versions["JACKSON"]!!}")
 
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")
diff --git a/modules/api/src/main/scala/de/nowchess/api/dto/GameWritebackEventDto.scala b/modules/api/src/main/scala/de/nowchess/api/dto/GameWritebackEventDto.scala
index f1feb9f..044a216 100644
--- a/modules/api/src/main/scala/de/nowchess/api/dto/GameWritebackEventDto.scala
+++ b/modules/api/src/main/scala/de/nowchess/api/dto/GameWritebackEventDto.scala
@@ -1,5 +1,7 @@
 package de.nowchess.api.dto
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+
 case class GameWritebackEventDto(
     gameId: String,
     fen: String,
@@ -14,11 +16,11 @@ case class GameWritebackEventDto(
     limitSeconds: Option[Int],
     incrementSeconds: Option[Int],
     daysPerMove: Option[Int],
-    whiteRemainingMs: Option[Long],
-    blackRemainingMs: Option[Long],
-    incrementMs: Option[Long],
-    clockLastTickAt: Option[Long],
-    clockMoveDeadline: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long]) whiteRemainingMs: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long]) blackRemainingMs: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long]) incrementMs: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long]) clockLastTickAt: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long]) clockMoveDeadline: Option[Long],
     clockActiveColor: Option[String],
     pendingDrawOffer: Option[String],
     result: Option[String] = None,
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
deleted file mode 100644
index eb446dc..0000000
--- a/modules/store/src/main/scala/de/nowchess/store/config/GameWritebackEventDtoMixin.scala
+++ /dev/null
@@ -1,10 +0,0 @@
-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 d0d2f7a..5042bb2 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
@@ -3,7 +3,6 @@ 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
 
@@ -16,4 +15,3 @@ 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])