code: def get_histories_group_by_user(self, context: AuthedServiceContext):
      result = self.stash.get_all(credentials=context.credentials)
      if result.is_err():
          return SyftError(message=result.err())
      code_histories: List[CodeHistory] = result.ok()
  
      user_service = context.node.get_service("userservice")
      result = user_service.stash.get_all(context.credentials)
      if result.is_err():
          return SyftError(message=result.err())
      users = result.ok()
  
      user_code_histories = UsersCodeHistoriesDict(
          node_uid=context.node.id
      )
  
      verify_key_2_user_email = {}
      for user in users:
          user_code_histories.user_dict[user.email] = []
          verify_key_2_user_email[user.verify_key] = user.email
  
      for code_history in code_histories:
          user_email = verify_key_2_user_email[
              code_history.user_verify_key
          ]
          user_code_histories.user_dict[user_email].append(
              code_history.service_func_name
          )
  
      return user_code_histories
  
imports: from typing import List
  from typing import Optional
  from typing import Union
  from ...serde.serializable import serializable
  from ...store.document_store import DocumentStore
  from ...types.uid import UID
  from ...util.telemetry import instrument
  from ..code.user_code import SubmitUserCode
  from ..code.user_code import UserCode
  from ..context import AuthedServiceContext
  from ..response import SyftError
  from ..response import SyftSuccess
  from ..service import AbstractService
  from ..service import service_method
  from ..user.user_roles import DATA_OWNER_ROLE_LEVEL
  from ..user.user_roles import DATA_SCIENTIST_ROLE_LEVEL
  from .code_history import CodeHistoriesDict
  from .code_history import CodeHistory
  from .code_history import CodeHistoryView
  from .code_history import UsersCodeHistoriesDict
  from .code_history_stash import CodeHistoryStash
label_desc: Use image node_id 9 for calling the CodeHistoryService obj's underlying member method code with example usage: obj.get_histories_group_by_user(context) and returns: user_code_histories, SyftError, SyftError