class_docstr: Base class for database handlers
  
  Base class for handlers that associate a source of information with the
  broader MindsDB ecosystem via SQL commands.
docstr: Set up any connections required by the handler
  
  Should return connection
code: def connect(self):
      """Set up any connections required by the handler
  
      Should return connection
  
      """
      raise NotImplementedError()
  
imports: import ast
  import inspect
  import textwrap
  from _ast import AnnAssign, AugAssign
  from typing import Any, Dict, List, Optional
  import pandas
  from mindsdb_sql.parser.ast.base import ASTNode
  from mindsdb.utilities import log
  from mindsdb.integrations.libs.response import HandlerResponse, HandlerStatusResponse
label_desc: Use image node_id 2 for calling the BaseHandler obj's underlying member method code with example usage: obj.connect() without return types