I haven't loaded this up so maybe this has been accounted for, but I think a critical feature is tying the original SQL query to all artifacts generated by Vanna.

Vanna would be helpful for someone that knows SQL when they don't know the existing schema and business logic and also just to save time as a co-pilot. But the users that get the most value out of this are the ones without the ability to validate the generated SQL. Issues will occur - people will give incomplete definitions to the AI, the AI will reproduce some rookie mistake it saw 1,000,000 times in its training data (like failing to realize that by default a UNIQUE INDEX will consider NULL != NULL), etc. At least if all distributed assets can tie back to the query people will be able to retroactively verify the query.