The nova.db.sqlalchemy.migrate_repo.versions.089_add_volume_id_mappings Module

downgrade(migrate_engine)
upgrade(migrate_engine)

Build mapping tables for our volume uuid migration.

These mapping tables serve two purposes: 1. Provide a method for downgrade after UUID conversion 2. Provide a uuid to associate with existing volumes and snapshots

when we do the actual datatype migration from int to uuid

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