Notes:

• I decide to not cover 100% of test, I added test for you to have a notion what is possible to do it with integration and unit tests.
• I decide to not implement 100% CRUD actions, I tried to keep simple and follow the minimal requirements with responsibility separation.
• I also decide to not map all relations between the tables using JPA, only the necessary for the features.
• I added data.sql to be load always for purpose test.

Generate jar:

 mvn install

Build docker project

 docker build -t quiz-api-docker.jar .

Start project

 docker-compose up 
# OR
 java -jar target/quiz-api-docker.jar

Discussion points

• Migration tool like Flyway and Liquibase.
• Persistence in memory or dedicated db and JPA decoupling code.
• Caching
• Pagination on API
• Reactive API: Project Reactor and Spring WebFlux