code: def delete_by_url(
      self, credentials: SyftVerifyKey, url: str
  ) -> Result[SyftSuccess, str]:
      qk = URLPartitionKey.with_obj(url)
      result = super().delete(credentials=credentials, qk=qk)
      if result.is_ok():
          return Ok(SyftSuccess(message=f"URL: {url} deleted"))
      return result
  
file_path: PySyft/packages/syft/src/syft/service/worker/image_registry_stash.py
imports: from typing import Optional
  from result import Ok
  from result import Result
  from ...node.credentials import SyftVerifyKey
  from ...serde.serializable import serializable
  from ...store.document_store import BaseUIDStoreStash
  from ...store.document_store import DocumentStore
  from ...store.document_store import PartitionKey
  from ...store.document_store import PartitionSettings
  from ...store.document_store import QueryKeys
  from ..response import SyftSuccess
  from .image_registry import SyftImageRegistry
label_desc: Use image node_id 3 for calling the SyftImageRegistryStash obj's underlying member method code with example usage: obj.delete_by_url(credentials, url) and returns: result, Ok