Great job! And congrats on actually getting something out there. I can really see this being useful for some organizations.
I also envisioned this same type of tool around 10 years ago and it is still on my ever growing list of ideas to implement. I took the idea further to support not only SQL but other languages such as HTML, JavaScript, Python, C#, etc. You could then support returning different types of media based on the URL extension such as .html to return a webpage, .json to return a JSON API, .csv to return a CSV file, etc. As time marched on, many of these same ideas came to fruition in things like AWS Lambda, Jupiter Notebooks, Microsoft Monaco Editor, etc.
I also envisioned this same type of tool around 10 years ago and it is still on my ever growing list of ideas to implement. I took the idea further to support not only SQL but other languages such as HTML, JavaScript, Python, C#, etc. You could then support returning different types of media based on the URL extension such as .html to return a webpage, .json to return a JSON API, .csv to return a CSV file, etc. As time marched on, many of these same ideas came to fruition in things like AWS Lambda, Jupiter Notebooks, Microsoft Monaco Editor, etc.