QA - Ensure that the app works well with the 3 questions selected by the Marketing Team

[cvbriggler]

We want to make sure that the canned questions to be used in the demo will work perfectly.

Test the app with the canned questions provided by marketing in the Top Marketing Question document in the code repository. Update the GEN_SQL system prompt so that the LLM provides SQL that generates a relevant result set.

Make sure that the data visualization makes sense for the response. Update plotly_helper..py and plotly_graphs.py to ensure correct graphing of responses for canned questions.