Triggers and procedures

I’ve been looking for refactorings to add new triggers and stored procedures, but unable to do so.

Isn’t this possible? If so, is this feature planned? 

To edit myself, there is a refactoring for procedures, but why not for triggers?

Triggers and procedures get into more database-specific type code that I have not yet gotten to so the support is just not there yet. You should be able to create them with extensions, though. The liquibase-oracle extension has some support for them as well for oracle.