diff -r 5c4364d6e726 -r 2d14f02ba3bd base/src/sqwl/cms/Service.scala
--- a/base/src/sqwl/cms/Service.scala	Tue Nov 24 11:17:26 2020 +0100
+++ b/base/src/sqwl/cms/Service.scala	Tue Nov 24 13:15:49 2020 +0100
@@ -1,12 +1,26 @@
+/*
+ * Copyright 2018-2020 Tomas Zeman <tomas@functionals.cz>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package sqwl.cms
 
-import akka.actor.ActorSystem
-import akka.stream.Materializer
+
+import akka.actor.typed.ActorSystem
 
 import scala.concurrent.ExecutionContextExecutor
 
-trait Service {
-  implicit val system: ActorSystem
+trait Service[T] {
+  implicit val system: ActorSystem[T]
   implicit def executor: ExecutionContextExecutor
-  implicit val materializer: Materializer
 }