def restore_db(release=None):
    """
    Restores backup back to version, uses current version by default.
    """

    if not release:
        release = paths.get_current_release_name()

    if not release:
        raise Exception("Release %s was not found" % release)

    backup_file = "postgresql/%s.sql.gz" % release
    backup_path = paths.get_backup_path(backup_file)

    if not env.exists(backup_path):
        raise Exception("Backup file %s not found" % backup_path)

    with context_managers.shell_env(PGPASSWORD=env.psql_password):
        env.run("pg_restore --clean -h localhost -d %s -U %s '%s'" % (
            env.psql_db,
            env.psql_user,
            backup_path)
        )
Restores backup back to version, uses current version by default.