text: from pydantic import validator
  from pydantic.dataclasses import dataclass
  
  from typing import List, Optional
  
  
  @dataclass
  class HdsTableMetadataConfig:
      """
      Attributes:
          eff_start_time_column_name : Insertion time column name
          eff_end_time_column_name: Expiry time column name
          partition_time_column_name: Partition time column name
          hash_column_name : Hash column name
      """
  
      eff_start_time_column_name: str = "af_metadata_created_at"
      eff_end_time_column_name: str = "af_metadata_expired_at"
      partition_time_column_name: str = "partition_time"
      hash_column_name: str = "af_metadata_row_hash"
  