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Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/db-string-type-cleanup. Description: The proposal here is to change from using SQLAlchemy's String type directly in our models to using logical datatypes that may or may not (depending on the database) map to string columns under the hood. Specification URL (additional information): https://wiki.openstack.org/wiki/Db-string-type-cleanup