code: def get_ssh_tunnel(cls, database_id: int) -> SSHTunnel | None:
      ssh_tunnel = (
          db.session.query(SSHTunnel)
          .filter(SSHTunnel.database_id == database_id)
          .one_or_none()
      )
  
      return ssh_tunnel
  
imports: from __future__ import annotations
  import logging
  from typing import Any
  from superset.daos.base import BaseDAO
  from superset.databases.filters import DatabaseFilter
  from superset.databases.ssh_tunnel.models import SSHTunnel
  from superset.extensions import db
  from superset.models.core import Database
  from superset.models.dashboard import Dashboard
  from superset.models.slice import Slice
  from superset.models.sql_lab import TabState
  from superset.utils.core import DatasourceType
  from superset.utils.ssh_tunnel import unmask_password_info
label_desc: Use image node_id 7 for calling the DatabaseDAO obj's underlying member method code with example usage: obj.get_ssh_tunnel(cls, database_id) and returns: ssh_tunnel