H2
H2 is an in memory database which you can query using standard SQL.
See https://h2database.com/html/main.html and ?? for more.
Spring Boot and Debug View §1
How to get started with using h2, please take a look at https://www.baeldung.com/spring-boot-h2-database
To use the console, run the application and go to http:/localhost:8080/h2-console. To log in use the jdbc:h2:file:./runtime/fordel.h2 url and leave the username and password blank.