append async

pkg/actor/simple_grain_pool.go

@@ -370,9 +370,13 @@ func (p *SimpleGrainPool[V]) Apply(id uint64, mutation proto.Message) (*V, error
 	if applyErr := p.mutationRegistry.Apply(grain, mutation); applyErr != nil {
 		return nil, applyErr
 	}
+	if p.storage != nil {
+		go func() {
 			if err := p.storage.AppendEvent(id, mutation); err != nil {
 				log.Printf("failed to store mutation for grain %d: %v", id, err)
 			}
+		}()
+	}
 	return grain.GetCurrentState()
 }