Use repoapi instead of dbapi for cwctl shell, upgrade and db-init
Hopefully nobody uses dbapi-specific API in their migration scripts. I
guess we'll find out.
ifnotrql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',ask_confirm=False):rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',ask_confirm=False)