diff --git a/common/src/main/protobuf/model/schedule.proto b/common/src/main/protobuf/model/schedule.proto
index 02a8a41..23ea5d0 100644
--- a/common/src/main/protobuf/model/schedule.proto
+++ b/common/src/main/protobuf/model/schedule.proto
@@ -47,6 +47,10 @@ message CronTab {
     required string cron = 4;
     optional google.protobuf.Timestamp lastTriggered = 5 [(scalapb.field).type = "java.util.Date"];
     optional google.protobuf.Timestamp nextTriggered = 6 [(scalapb.field).type = "java.util.Date"];
+    // Story 13.7 — cross-service correlation id. Carried onto the derived Schedule in
+    // cronTabToSchedule so cron-based recurring renewals reach the consumer with the originating
+    // id. ScalaPB → correlationId: Option[String] + withCorrelationId.
+    optional string correlation_id = 7;
 }
 
 // Scheduler
diff --git a/common/src/main/scala/app/softnetwork/scheduler/model/package.scala b/common/src/main/scala/app/softnetwork/scheduler/model/package.scala
index dabd9ad..770de1f 100644
--- a/common/src/main/scala/app/softnetwork/scheduler/model/package.scala
+++ b/common/src/main/scala/app/softnetwork/scheduler/model/package.scala
@@ -116,6 +116,7 @@ package object model {
             .withScheduledDate(date)
 //            .withRepeatedly(true)
             .withCronTab(cronTab.uuid)
+            .copy(correlationId = cronTab.correlationId)
         )
       case _ => None
     }