OpenStack Study: migration.py

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def db_sync(version=None):

    """Migrate the database to `version` or the most recent version."""

    return IMPL.db_sync(version=version)

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def db_version():

    """Display the current database version."""

    return IMPL.db_version()

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def db_initial_version():

    """The starting version for the database."""

    return IMPL.db_initial_version()