code: def send_internal(self, write_file: BinaryIO):
      raise NotImplementedError(
          "Must implement send_internal in sub-class"
      )
  
file_path: mindsdb/mindsdb/api/postgres/postgres_proxy/postgres_packets/postgres_message.py
imports: from typing import Union, BinaryIO
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_message_identifiers import PostgresBackendMessageIdentifier, PostgresFrontendMessageIdentifier
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_packets import PostgresPacketReader, PostgresPacketBuilder
label_desc: Use image node_id 3 for calling the PostgresMessage obj's underlying member method code with example usage: obj.send_internal(write_file) without return types