createEntityAgent() returns: org.hibernate.internal.StatelessSessionImpl
instanceof org.hibernate.StatelessSession: true

upsert(theme=dark) on an existing row, upsert(language=en) on a new row (2 statements)
  merge into setting as t using (select cast(? as varchar(255)) name,cast(? as varchar(255)) val) as s on (t.name=s.name) when not matched then insert (name,val) values (s.name,s.val) when matched then update set val=s.val
  merge into setting as t using (select cast(? as varchar(255)) name,cast(? as varchar(255)) val) as s on (t.name=s.name) when not matched then insert (name,val) values (s.name,s.val) when matched then update set val=s.val
theme    -> dark
language -> en

insert() with an existing primary key -> jakarta.persistence.EntityExistsException
find() after delete() -> null
