How to clear pipeline data?

[Panicum]

I created the RAG pipeline in which I am saving data in the variable "self.campaign_data":

def __init__(self):
        # Optionally, you can set the id and name of the pipeline.
        self.name = "Pipeline XYZ"
        self.campaign_data = {
            "company_name": None,
            "product_name": None,
            "date_from": None,
            "date_to": None
        }
        pass

I would like to have it reset on every new "Pipeline XYZ" chat window, but for now, it is taking data entered in different chats and using it in the new conversations.