How do you handle a "Delete" request in your vector database if a user wants their data removed (Right to be Forgotten)?

Walk me through the lifecycle of a user query, from the moment they hit "Enter" to the final response generation.

If the retriever returns zero relevant documents, how do you prevent the LLM from making up an answer?

Why is "fixed-length" chunking often insufficient? How would you handle a document where a single sentence contains a critical fact but spans a chunk boundary?