diff --git a/config/models b/config/models
index 9d396a0..ffded75 100644
--- a/config/models
+++ b/config/models
@@ -312,8 +312,10 @@ TicketAuthorLocal
 TicketAuthorRemote
     ticket TicketId
     author RemoteActorId
+    offer  RemoteActivityId
 
     UniqueTicketAuthorRemote ticket
+    UniqueTicketAuthorRemoteOffer offer
 
 TicketDependency
     parent TicketId
diff --git a/src/Vervis/Migration.hs b/src/Vervis/Migration.hs
index 0fcc8ba..28bd6e9 100644
--- a/src/Vervis/Migration.hs
+++ b/src/Vervis/Migration.hs
@@ -663,6 +663,11 @@ changes hLocal ctx =
         "FollowerSet"
       -- 111
     , addUnique "Project" $ Unique "UniqueProjectFollowers" ["followers"]
+      -- 112
+    , addFieldRefRequiredEmpty "TicketAuthorRemote" "offer" "RemoteActivity"
+      -- 113
+    , addUnique "TicketAuthorRemote" $
+        Unique "UniqueTicketAuthorRemoteOffer" ["offer"]
     ]
 
 migrateDB