I guess I could just write in if partition date is before _ do nothing, but I wonder if there is another way

Hi Lindsay, there is unfortunately no way to mark a partition as being materialized without just directly materializing the asset. We do have an issue to track this. I would say your best options are to do the "before _ do nothing" change, or to yield your desired materializations separately within a different job i.e.

context.log_event(AssetMaterialization(...))

.