docs: def bootstrap_unihan(metadata, options={}):
      """Download, extract and import unihan to database."""
      options = merge_dict(UNIHAN_ETL_DEFAULT_OPTIONS.copy(), options)
  
      p = unihan.Packager(options)
      p.download()
      data = p.export()
      table = create_unihan_table(UNIHAN_FIELDS, metadata)
      metadata.create_all()
      metadata.bind.execute(table.insert(), data)