diff --git a/core/src/lu/foyer/EventSourcing.scala b/core/src/lu/foyer/EventSourcing.scala
index bd157af..370a4bf 100644
--- a/core/src/lu/foyer/EventSourcing.scala
+++ b/core/src/lu/foyer/EventSourcing.scala
@@ -12,13 +12,3 @@ trait StateRepository[Data] extends Repository[Entity[Data], String]
 trait EventRepository[Data] extends Repository[Event[Data], String]:
   def fetchOne(entityId: String, eventId: String): Task[Option[Event[Data]]]
   def fetchMany(entityId: String, page: Page): Task[Paged[Event[Data]]]
-
-trait Reducer[Event, State]:
-  def fromEmpty: PartialFunction[Event, State]
-  def fromState: PartialFunction[(State, Event), State]
-
-  def reduce(event: Event): Option[State] =
-    fromEmpty.lift(event)
-
-  def reduce(state: State, event: Event): Option[State] =
-    fromState.lift((state, event))
diff --git a/core/src/lu/foyer/Reducer.scala b/core/src/lu/foyer/Reducer.scala
new file mode 100644
index 0000000..6d567fd
--- /dev/null
+++ b/core/src/lu/foyer/Reducer.scala
@@ -0,0 +1,11 @@
+package lu.foyer
+
+trait Reducer[Event, State]:
+  def fromEmpty: PartialFunction[Event, State]
+  def fromState: PartialFunction[(State, Event), State]
+
+  def reduce(event: Event): Option[State] =
+    fromEmpty.lift(event)
+
+  def reduce(state: State, event: Event): Option[State] =
+    fromState.lift((state, event))