Hey! First of all, thank you for a great platform! I'm interested in how it is implemented. Is there any page that describes the architecture of DB<>Fiddle? 

The most interested questions for me are as follows:
- How and where queries are executed?
- Do you use transactions to abort changes and allow arbitrary types of queries?
- Is it open-sourced? Couldn't find any repository in GitHub. If no, is it possible to open source it?

Thank you in advance.