What is the database solution behind this Cayenne


Would like to know what is the database behind this Cayenne Dashboard.
Is it NoSQL or SQL and do you have an example how to use custom sql-like query…

What is the correct syntax for this?

WHERE created_at >= 1593723955000 ORDER BY “created_at”
AND Unit == “P” desc


I also need to know as I want to create a custom query that can fetch past 72 hrs data and I dont see any help in Cayenne on how to achieve it.