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geo_db_meta = MetaData()
geo_db_meta.reflect(bind=engine)

geom_table = geo_db_meta.tables[table_name]
initial_cols = _column_metadata_from_columns(geom_table.columns)
stmt = (
    update(snapshots).where(snapshots.c.id==snapshot_id)
    .values(columns=initial_cols)
)
session = orm.Session(bind=bind)