diff --git a/numalogic/registry/redis_registry.py b/numalogic/registry/redis_registry.py
index 0aec7530..f19c759e 100644
--- a/numalogic/registry/redis_registry.py
+++ b/numalogic/registry/redis_registry.py
@@ -14,13 +14,14 @@
 from datetime import datetime, timedelta
 from typing import Optional
 import orjson
+import redis.client
 
 from redis.exceptions import RedisError
 
 from numalogic.registry.artifact import ArtifactManager, ArtifactData, ArtifactCache
 from numalogic.registry._serialize import loads, dumps
 from numalogic.tools.exceptions import ModelKeyNotFound, RedisRegistryError
-from numalogic.tools.types import artifact_t, redis_client_t, KEYS, META_T, META_VT, ArtifactTuple
+from numalogic.tools.types import artifact_t, redis_client_t, KEYS, META_T, META_VT, KeyedArtifact
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -180,7 +181,7 @@ def __load_version_artifact(self, version: str, key: str) -> tuple[ArtifactData,
             _LOGGER.debug("Found cached version artifact for key: %s", version_key)
             return cached_artifact, True
         if not self.client.exists(version_key):
-            raise ModelKeyNotFound("Could not find model key with key: %s" % version_key)
+            raise ModelKeyNotFound(f"Could not find model key with key: {version_key}")
         return (
             self.__get_artifact_data(
                 model_key=version_key,
@@ -253,7 +254,9 @@ def load(
         else:
             if not is_cached:
                 if latest:
-                    _LOGGER.info("Saving %s, in cache as %s", self.__construct_latest_key(key), key)
+                    _LOGGER.debug(
+                        "Saving %s, in cache as %s", self.__construct_latest_key(key), key
+                    )
                     self._save_in_cache(self.__construct_latest_key(key), artifact_data)
                 else:
                     _LOGGER.info(
@@ -269,7 +272,7 @@ def save(
         skeys: KEYS,
         dkeys: KEYS,
         artifact: artifact_t,
-        pipe=None,
+        _pipe: Optional[redis.client.Pipeline] = None,
         **metadata: META_VT,
     ) -> Optional[str]:
         """Saves the artifact into redis registry and updates version.
@@ -279,6 +282,7 @@ def save(
             skeys: static key fields as list/tuple of strings
             dkeys: dynamic key fields as list/tuple of strings
             artifact: primary artifact to be saved
+            _pipe: RedisPipeline object
             metadata: additional metadata surrounding the artifact that needs to be saved.
 
         Returns
@@ -297,15 +301,15 @@ def save(
                 _LOGGER.debug("Latest key: %s exists for the model", latest_key)
                 version_key = self.client.get(name=latest_key)
                 version = int(self.get_version(version_key.decode())) + 1
-            redis_pipe = (
-                self.client.pipeline(transaction=self.transactional) if pipe is None else pipe
+            _redis_pipe = (
+                self.client.pipeline(transaction=self.transactional) if _pipe is None else _pipe
             )
             new_version_key = self.__save_artifact(
-                pipe=redis_pipe, artifact=artifact, key=key, version=str(version), **metadata
+                pipe=_redis_pipe, artifact=artifact, key=key, version=str(version), **metadata
             )
-            redis_pipe.expire(name=new_version_key, time=self.ttl)
-            if pipe is None:
-                redis_pipe.execute()
+            _redis_pipe.expire(name=new_version_key, time=self.ttl)
+            if _pipe is None:
+                _redis_pipe.execute()
         except RedisError as err:
             raise RedisRegistryError(f"{err.__class__.__name__} raised") from err
         else:
@@ -333,7 +337,7 @@ def delete(self, skeys: KEYS, dkeys: KEYS, version: str) -> None:
                 self.client.delete(del_key)
             else:
                 raise ModelKeyNotFound(
-                    "Key to delete: %s, Not Found!" % del_key,
+                    f"Key to delete: {del_key}, Not Found!",
                 )
         except RedisError as err:
             raise RedisRegistryError(f"{err.__class__.__name__} raised") from err
@@ -369,7 +373,7 @@ def is_artifact_stale(artifact_data: ArtifactData, freq_hr: int) -> bool:
     def save_multiple(
         self,
         skeys: KEYS,
-        dict_artifacts: dict[str, ArtifactTuple],
+        dict_artifacts: dict[str, KeyedArtifact],
         **metadata: META_VT,
     ):
         """
@@ -391,7 +395,7 @@ def save_multiple(
                         skeys=skeys,
                         dkeys=value.dkeys,
                         artifact=value.artifact,
-                        pipe=pipe,
+                        _pipe=pipe,
                         **metadata,
                     )
 
@@ -400,7 +404,7 @@ def save_multiple(
                             skeys=skeys,
                             dkeys=value.dkeys,
                             artifact=value.artifact,
-                            pipe=pipe,
+                            _pipe=pipe,
                             artifact_versions=dict_model_ver,
                             **metadata,
                         )
diff --git a/numalogic/tools/types.py b/numalogic/tools/types.py
index f50cc42d..22214b3c 100644
--- a/numalogic/tools/types.py
+++ b/numalogic/tools/types.py
@@ -38,7 +38,7 @@
 KEYS = TypeVar("KEYS", bound=Sequence[str], covariant=True)
 
 
-class ArtifactTuple(NamedTuple):
+class KeyedArtifact(NamedTuple):
     r"""namedtuple for artifacts."""
 
     dkeys: KEYS
diff --git a/numalogic/udfs/tools.py b/numalogic/udfs/tools.py
index b2dee9de..d9cd39fb 100644
--- a/numalogic/udfs/tools.py
+++ b/numalogic/udfs/tools.py
@@ -65,7 +65,7 @@ def make_stream_payload(
     )
 
 
-# TODO: move to base NumalogicUDF class
+# TODO: move to base NumalogicUDF class and look into payload mutation
 def _load_artifact(
     skeys: KEYS,
     dkeys: KEYS,
diff --git a/numalogic/udfs/trainer.py b/numalogic/udfs/trainer.py
index 5d53a195..f35b6ca9 100644
--- a/numalogic/udfs/trainer.py
+++ b/numalogic/udfs/trainer.py
@@ -19,7 +19,7 @@
 from numalogic.registry import RedisRegistry
 from numalogic.tools.data import StreamingDataset
 from numalogic.tools.exceptions import ConfigNotFoundError, RedisRegistryError
-from numalogic.tools.types import redis_client_t, artifact_t, KEYS, ArtifactTuple
+from numalogic.tools.types import redis_client_t, artifact_t, KEYS, KeyedArtifact
 from numalogic.udfs import NumalogicUDF
 from numalogic.udfs._config import StreamConf, PipelineConf
 from numalogic.udfs.entities import TrainerPayload, StreamPayload
@@ -194,13 +194,13 @@ def exec(self, keys: list[str], datum: Datum) -> Messages:
         # TODO perform multi-save here
         skeys = payload.composite_keys
         dict_artifacts = {
-            "postproc": ArtifactTuple(
+            "postproc": KeyedArtifact(
                 dkeys=[_conf.numalogic_conf.threshold.name], artifact=artifacts["threshold_clf"]
             ),
-            "inference": ArtifactTuple(
+            "inference": KeyedArtifact(
                 dkeys=[_conf.numalogic_conf.model.name], artifact=artifacts["model"]
             ),
-            "preproc": ArtifactTuple(
+            "preproc": KeyedArtifact(
                 dkeys=[_conf.name for _conf in _conf.numalogic_conf.preprocess],
                 artifact=artifacts["preproc_clf"],
             ),
@@ -233,7 +233,7 @@ def _construct_preproc_clf(_conf: StreamConf) -> Optional[artifact_t]:
     @staticmethod
     def artifacts_to_save(
         skeys: KEYS,
-        dict_artifacts: dict[str, ArtifactTuple],
+        dict_artifacts: dict[str, KeyedArtifact],
         model_registry: RedisRegistry,
         payload: StreamPayload,
     ) -> None:
diff --git a/tests/registry/test_redis_registry.py b/tests/registry/test_redis_registry.py
index 09e138d4..de252cf1 100644
--- a/tests/registry/test_redis_registry.py
+++ b/tests/registry/test_redis_registry.py
@@ -13,7 +13,7 @@
 from numalogic.models.autoencoder.variants import VanillaAE
 from numalogic.registry import RedisRegistry, LocalLRUCache, ArtifactData
 from numalogic.tools.exceptions import ModelKeyNotFound, RedisRegistryError
-from numalogic.tools.types import ArtifactTuple
+from numalogic.tools.types import KeyedArtifact
 
 logging.basicConfig(level=logging.DEBUG)
 
@@ -191,8 +191,8 @@ def test_multiple_save(self):
         self.registry.save_multiple(
             skeys=self.skeys,
             dict_artifacts={
-                "AE": ArtifactTuple(dkeys=["AE"], artifact=VanillaAE(10)),
-                "scaler": ArtifactTuple(dkeys=["scaler"], artifact=StandardScaler()),
+                "AE": KeyedArtifact(dkeys=["AE"], artifact=VanillaAE(10)),
+                "scaler": KeyedArtifact(dkeys=["scaler"], artifact=StandardScaler()),
             },
             **{"a": "b"}
         )
@@ -248,5 +248,5 @@ def test_exception_call4(self):
         with self.assertRaises(RedisRegistryError):
             self.registry.save_multiple(
                 skeys=self.skeys,
-                dict_artifacts={"AE": ArtifactTuple(dkeys=self.dkeys, artifact=VanillaAE(10))},
+                dict_artifacts={"AE": KeyedArtifact(dkeys=self.dkeys, artifact=VanillaAE(10))},
             )
diff --git a/tests/udfs/utility.py b/tests/udfs/utility.py
index 7587e8e6..bb7da059 100644
--- a/tests/udfs/utility.py
+++ b/tests/udfs/utility.py
@@ -7,7 +7,7 @@
 
 from numalogic.config import PreprocessFactory
 from numalogic.models.autoencoder.variants import VanillaAE
-from numalogic.tools.types import ArtifactTuple
+from numalogic.tools.types import KeyedArtifact
 
 
 def input_json_from_file(data_path: str) -> Datum:
@@ -50,8 +50,8 @@ def store_in_redis(pl_conf, registry):
         registry.save_multiple(
             skeys=pl_conf.stream_confs["druid-config"].composite_keys,
             dict_artifacts={
-                "inference": ArtifactTuple(dkeys=["AE"], artifact=VanillaAE(10)),
-                "preproc": ArtifactTuple(
+                "inference": KeyedArtifact(dkeys=["AE"], artifact=VanillaAE(10)),
+                "preproc": KeyedArtifact(
                     dkeys=[
                         _conf.name
                         for _conf in pl_conf.stream_confs["druid-config"].numalogic_conf.preprocess