Folks I have using PGVector as the vector store for llama index. However when add/refresh documents a new row is create in the table ? Why is that? I was under the impression that if the content is the same, and the ids are the same new embeddings won't be created and now new rows will be created in the postgres database

I have a question regarding llama index and pg vectors. Let's say I have index created with the document (ex paul graham essary). Let say a few file is created now I have 2 documents 1 for paul graham and 2nd is for Naval. How do I make sure that only the Naval document is indexed into pg vector and not paul graham? Currently its creating new rows