Does Metabase execute any queries to the application DB when idle?

Wondering if the app makes queries to the application database when idle? If so, is it possible to configure how often these queries are made? I have a serverless DB but it never seems to go idle. This is the only app connected to that Database and it is a fresh Metabase docker install, and no browser clients are connected to the app.

unfortunately Metabase keeps a persistent connection to the app db

Thank you for clarifying this for me!