Background I currently use add_messages for message state management. Every checkpoint stores the full message list into PostgreSQL, which causes O(n²) storage growth over long conversations. I’d like to migrate to DeltaChannel for incremental storage. My graph also performs message compression — using RemoveMessage to delete old messages to keep context window manageable. My Confusion With add_messages, RemoveMessageis interpreted by the reducer and the target message is removed from the ac...