what do I put in the field 'model' if I have Vapi as the model provider? and how to prevent affecting an existing assistent when only adding the knowledge base? (if I use vapi model and the blocks, duplicating wont make sense because I have to build the blocks again) https://cdn.discordapp.com/attachments/1211484481848873020/1327263339637637162/Screenshot_2025-01-10_at_2.09.17_PM.png?ex=67826dcf&is=67811c4f&hm=0ba9aedead82717287b95a6ad9573cf1937a0c684eee563bf6c8fe087666480a& https://cdn.discordapp.com/attachments/1211484481848873020/1327263340006740140/Screenshot_2025-01-10_at_2.09.08_PM.png?ex=67826dcf&is=67811c4f&hm=b8524ef27e8899ac3e951a1a2071284953b2c018a341baae32c7e30661641830&