I've been working on a hobby project to make all the site, videos and conversations I've seen searchable (aka external memory). While building it I used this to prepare the data and get around the prompt limits https://github.com/jerryjliu/gpt_index
Could you share anything (e.g. how many rows of data and tokens in each row) around how much it cost you to use GPT Index? It looks interesting, but it seems it'd be expensive.