fix(activitypub-base): deterministic announce IDs so Undo(Announce) can reference original activity

crates/application/src/services/federation_event.rs

@@ -414,6 +414,21 @@ mod tests {
         assert_eq!(undo_announced[0], "https://mastodon.social/users/bob/statuses/456");
     }
 
+    #[tokio::test]
+    async fn boost_removed_does_not_broadcast_if_thought_missing() {
+        let store = TestStore::default();
+        let alice = alice();
+        let spy = Arc::new(SpyPort::default());
+        svc(&store, spy.clone())
+            .process(&DomainEvent::BoostRemoved {
+                user_id: alice.id.clone(),
+                thought_id: ThoughtId::new(), // doesn't exist in store
+            })
+            .await
+            .unwrap();
+        assert!(spy.undo_announced.lock().unwrap().is_empty());
+    }
+
     #[tokio::test]
     async fn thought_updated_does_not_broadcast_if_user_missing() {
         let store = TestStore::default();