Does the system message gets updated? RealtimeAPI

API
,
1

Because the realtime api does not have a mechanism to access the historic messages for a session, I want to know if I send a new system message, the system message in question gets updated or I am appending a new one, that would cause hallucination? The use case is the following: I have a foreign language coach that teaches the user languages and the user, in the middle of the conversation can change the proficiency level (begginer, intermediate, advanced) that changes a variable in the system message and sends it again as:

socket.data.openAiWs.send(
      JSON.stringify({
        type: 'conversation.item.create',
        item: {
          type: 'message',
          role: 'system',
          content: [
            {
              type: 'input_text',
              text,
            },
          ],
        },
      })
    );

Is this updating the system message or appending a new system message?