docs: def is_bootstrapped(metadata):
      """Return True if cihai is correctly bootstrapped."""
      fields = UNIHAN_FIELDS + DEFAULT_COLUMNS
      if TABLE_NAME in metadata.tables.keys():
          table = metadata.tables[TABLE_NAME]
  
          if set(fields) == set(c.name for c in table.columns):
              return True
          else:
              return False
      else:
          return False