Filtering and trimming messages

Filtering and trimming messages Review Now, we have a deeper understanding of a few things: * How to customize the graph state schema * How to define custom state reducers * How to use multiple graph state schemas Goals Now, we can start using these concepts with models in LangGraph! In the next few sessions, we'll build towards a chatbot that has long-term memory. Because our chatbot will use messages, let's first talk a bit more about advanced ways to work with messages in graph state.