Very nice! I added a similar feature to https://sitespeak.ai recently that allows my users to connect their virtual assistant to a Sqlite database to retrieve data to answer visitor questions. Initially this was just a way around the difficulty of "chatting to a CSV" so the solution was to convert any CSV to a Sqlite database and using that, but it's proved very useful.
Will definitely look at using Dataherald for adding proper SQL support!
Will definitely look at using Dataherald for adding proper SQL support!