https://www.baeldung.com/learn-jpa-hibernate

2022
https://vladmihalcea.com/spring-data-jpa-findbyid/
    https://www.reddit.com/r/java/comments/yvoyov/the_spring_data_jpa_findbyid_antipattern/
https://springbootlearning.medium.com/jdbc-vs-jpa-623fe8258e8
    https://habr.com/ru/company/otus/blog/686082/
2021
https://thorben-janssen.com/spring-data-jpa-state-detection/
2019
https://habr.com/ru/articles/441386/
    ! tons of misc stuff