Description

In Spring, I could change the transaction isolation level in their @Transactional annotation (please see https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/transaction/annotation/Transactional.html) however Quarkus is using the Java EE annotation which doesn't permit isolation level configuration.

My app is separated between read only API endpoints (high traffic) and write API endpoints (low traffic), so it would be very useful to have serializable isolation level for the write endpoints and default (read uncommitted) isolation level for read only endpoints.

Implementation ideas

Quarkus already has a TransactionConfiguration annotation to configure transaction timeout, it would be a good idea to add an isolation level configuration there.