code: def _read_bytes(col_name: str, value: Any) -> Optional[bytes]:
      if value is None or isinstance(value, bytes):
          return value
      # Note that the Postgres Driver returns memoryview's for BLOB types
      if isinstance(value, memoryview):
          return value.tobytes()
      if isinstance(value, str):
          return bytes(value.encode("utf8"))
  
      # Just bail if we haven't seen this type before...
      raise ValueError(
          _(
              "DB column %(col_name)s has unknown type: %(value_type)s",
              col_name=col_name,
              value_type=type(value),
          )
      )
  
imports: import logging
  from abc import ABC, abstractmethod
  from typing import Any, Optional
  from flask import Flask
  from flask_babel import lazy_gettext
  from sqlalchemy import text, TypeDecorator
  from sqlalchemy.engine import Connection, Dialect, Row
  from sqlalchemy_utils import EncryptedType
label_desc: Use image node_id 3 for calling the SecretsMigrator obj's underlying member method code with example usage: obj._read_bytes(col_name, value) and returns: value, value, bytes