text: from common.constants import Blockchain
  from common.sql.enum import Enum
  from common.sql.hex_string import HexString
  from common.sql.uuid import UUID
  from sqlalchemy import Column, Integer
  
  from backend.sql.base import Base
  
  
  class BlockchainTransaction(Base):
      __tablename__ = "BlockchainTransaction"
      blockchain = Column(Enum(Blockchain), primary_key=True, nullable=False)
      blockchain_transaction_identifier = Column(HexString(32), primary_key=True, nullable=False)
      block_number = Column(Integer, index=True)
      transaction_uuid = Column(UUID, nullable=False, index=True)
  