Hi @beikov ,
thanks, I confirm that using a custom BooleanJavaType with @JavaTypeRegistration it works. What initially held me back from this approach is that I can’t understand why Hibernate generates constraints even though I have set generate-ddl: false and ddl-auto: none. My database already exists, so Hibernate should not be responsible for generating the database script (and consequently, not the check condition either). Why does Hibernate always generate the check conditions?