JPA best practices

1.  https://stackoverflow.com/questions/2585641/hibernate-jpa-db-schema-generation-best-practices
2.  
3. do not let hibernate create the schema
4. https://stackoverflow.com/questions/8815037/how-to-create-database-schema-in-hibernate-first-time-and-further-update-it-in-c 
5. https://www.thoughts-on-java.org/hibernate-tips-create-initialize-database/
6. https://shekhargulati.com/2018/01/09/programmatically-generating-database-schema-with-hibernate-5/ 
7.  http://what-when-how.com/enterprise-javabeans-3/domain-modeling-and-the-jpa-ejb-3/