diff --git a/ax/core/arm.py b/ax/core/arm.py
index af2fc40b924..ffc54976b2e 100644
--- a/ax/core/arm.py
+++ b/ax/core/arm.py
@@ -90,7 +90,7 @@ def md5hash(parameters: Mapping[str, TParamValue]) -> str:
         new_parameters = {}
         for k, v in parameters.items():
             new_parameters[k] = numpy_type_to_python_type(v)
-        parameters_str = json.dumps(parameters, sort_keys=True)
+        parameters_str = json.dumps(new_parameters, sort_keys=True)
         return hashlib.md5(parameters_str.encode("utf-8")).hexdigest()
 
     def clone(self, clear_name: bool = False) -> "Arm":
diff --git a/ax/core/experiment.py b/ax/core/experiment.py
index 3662eb51cd2..0f2755be912 100644
--- a/ax/core/experiment.py
+++ b/ax/core/experiment.py
@@ -727,7 +727,7 @@ def bulk_configure_metrics_of_class(
                 UserInputError(
                     f"Metric class {metric_class} does not contain the requested "
                     "attributes to update. Requested updates to attributes: "
-                    f"{set(attributes_to_update.keys())} but metric class defines"
+                    f"{set(attributes_to_update.keys())} but metric class defines "
                     f"{metric_attributes}."
                 )
             )
diff --git a/ax/core/generator_run.py b/ax/core/generator_run.py
index b4b17290662..2235e2c8e9a 100644
--- a/ax/core/generator_run.py
+++ b/ax/core/generator_run.py
@@ -343,6 +343,14 @@ def clone(self) -> GeneratorRun:
             if self._generator_state_after_gen is not None
             else None
         )
+        generator_run._gen_metadata = (
+            self._gen_metadata.copy() if self._gen_metadata is not None else None
+        )
+        generator_run._candidate_metadata_by_arm_signature = (
+            self._candidate_metadata_by_arm_signature.copy()
+            if self._candidate_metadata_by_arm_signature is not None
+            else None
+        )
         return generator_run
 
     def add_arm(self, arm: Arm, weight: float = 1.0) -> None:
diff --git a/ax/core/metric.py b/ax/core/metric.py
index db006e36823..c5f2289c191 100644
--- a/ax/core/metric.py
+++ b/ax/core/metric.py
@@ -165,7 +165,7 @@ def period_of_new_data_after_trial_completion(cls) -> timedelta:
         return timedelta(0)
 
     @classmethod
-    def is_reconverable_fetch_e(cls, metric_fetch_e: MetricFetchE) -> bool:
+    def is_recoverable_fetch_e(cls, metric_fetch_e: MetricFetchE) -> bool:
         """Checks whether the given MetricFetchE is recoverable for this metric class
         in ``orchestrator._fetch_and_process_trials_data_results``.
         """
diff --git a/ax/core/outcome_constraint.py b/ax/core/outcome_constraint.py
index f7f88386171..1d22616f3f4 100644
--- a/ax/core/outcome_constraint.py
+++ b/ax/core/outcome_constraint.py
@@ -28,7 +28,7 @@
 
 CONSTRAINT_THRESHOLD_WARNING_MESSAGE: str = (
     "Constraint threshold on {name} appears invalid: {bound} bound on metric "
-    + "for which {is_better} values is better."
+    + "for which {is_better} values are better."
 )
 UPPER_BOUND_THRESHOLD: dict[str, str] = {"bound": "Positive", "is_better": "lower"}
 LOWER_BOUND_THRESHOLD: dict[str, str] = {"bound": "Negative", "is_better": "higher"}
@@ -120,7 +120,7 @@ def _validate_metric_constraint_op(
             if op == ComparisonOp.LEQ and not metric.lower_is_better:
                 fmt_data = UPPER_BOUND_MISMATCH
         if fmt_data is not None:
-            fmt_data["name"] = metric.name
+            fmt_data = {**fmt_data, "name": metric.name}
             msg = CONSTRAINT_WARNING_MESSAGE.format(**fmt_data)
             logger.debug(msg)
             return False, msg
@@ -156,7 +156,7 @@ def _validate_constraint(self) -> tuple[bool, str]:
             if self.bound > 0 and not self.metric.lower_is_better:
                 fmt_data = LOWER_BOUND_THRESHOLD
         if fmt_data is not None:
-            fmt_data["name"] = self.metric.name
+            fmt_data = {**fmt_data, "name": self.metric.name}
             msg += CONSTRAINT_THRESHOLD_WARNING_MESSAGE.format(**fmt_data)
             logger.debug(msg)
             return False, msg
diff --git a/ax/core/parameter.py b/ax/core/parameter.py
index 7591c525a35..e396c792677 100644
--- a/ax/core/parameter.py
+++ b/ax/core/parameter.py
@@ -423,13 +423,13 @@ def _validate_range_param(
             ParameterType.FLOAT,
         ):
             raise UserInputError(
-                f"RangeParameter {self.name}type must be int or float."
+                f"RangeParameter {self.name} type must be int or float."
             )
 
         upper = float(upper)
         if lower >= upper:
             raise UserInputError(
-                f"Upper bound of {self.name} must be strictly larger than lower."
+                f"Upper bound of {self.name} must be strictly larger than lower. "
                 f"Got: ({lower}, {upper})."
             )
         width: float = upper - lower
diff --git a/ax/core/parameter_constraint.py b/ax/core/parameter_constraint.py
index ef1621ab36d..3eabdc6db64 100644
--- a/ax/core/parameter_constraint.py
+++ b/ax/core/parameter_constraint.py
@@ -129,7 +129,7 @@ def validate_constraint_parameters(parameters: Sequence[Parameter]) -> None:
     for parameter in parameters:
         if not isinstance(parameter, RangeParameter):
             raise ValueError(
-                "All parameters in a parameter constraint must be RangeParameters."
+                "All parameters in a parameter constraint must be RangeParameters. "
                 f"Found {parameter}"
             )
 
diff --git a/ax/core/tests/test_outcome_constraint.py b/ax/core/tests/test_outcome_constraint.py
index 58072e169e1..fcc6ed79cf5 100644
--- a/ax/core/tests/test_outcome_constraint.py
+++ b/ax/core/tests/test_outcome_constraint.py
@@ -63,14 +63,14 @@ def test_OutcomeConstraintFail(self) -> None:
                 metric=self.minimize_metric, op=ComparisonOp.GEQ, bound=self.bound
             )
         mock_warning.debug.assert_called_once_with(
-            CONSTRAINT_WARNING_MESSAGE.format(**LOWER_BOUND_MISMATCH)
+            CONSTRAINT_WARNING_MESSAGE.format(**LOWER_BOUND_MISMATCH, name="bar")
         )
         with mock.patch(logger_name) as mock_warning:
             OutcomeConstraint(
                 metric=self.maximize_metric, op=ComparisonOp.LEQ, bound=self.bound
             )
         mock_warning.debug.assert_called_once_with(
-            CONSTRAINT_WARNING_MESSAGE.format(**UPPER_BOUND_MISMATCH)
+            CONSTRAINT_WARNING_MESSAGE.format(**UPPER_BOUND_MISMATCH, name="baz")
         )
 
     def test_Sortable(self) -> None:
@@ -144,14 +144,14 @@ def test_ObjectiveThresholdFail(self) -> None:
                 metric=self.minimize_metric, op=ComparisonOp.GEQ, bound=self.bound
             )
         mock_warning.debug.assert_called_once_with(
-            CONSTRAINT_WARNING_MESSAGE.format(**LOWER_BOUND_MISMATCH)
+            CONSTRAINT_WARNING_MESSAGE.format(**LOWER_BOUND_MISMATCH, name="bar")
         )
         with mock.patch(logger_name) as mock_warning:
             ObjectiveThreshold(
                 metric=self.maximize_metric, op=ComparisonOp.LEQ, bound=self.bound
             )
         mock_warning.debug.assert_called_once_with(
-            CONSTRAINT_WARNING_MESSAGE.format(**UPPER_BOUND_MISMATCH)
+            CONSTRAINT_WARNING_MESSAGE.format(**UPPER_BOUND_MISMATCH, name="baz")
         )
 
     def test_Relativize(self) -> None:
diff --git a/ax/orchestration/orchestrator.py b/ax/orchestration/orchestrator.py
index 8d4804893b7..a35cfe8aa51 100644
--- a/ax/orchestration/orchestrator.py
+++ b/ax/orchestration/orchestrator.py
@@ -1227,7 +1227,7 @@ def _check_exit_status_and_report_results(
         if not self.options.wait_for_running_trials:
             return None
         return self.wait_for_completed_trials_and_report_results(
-            idle_callback, force_refit=True
+            idle_callback, force_refit=force_refit
         )
 
     def run(self, max_new_trials: int, timeout_hours: float | None = None) -> bool:
@@ -2093,9 +2093,9 @@ def _fetch_and_process_trials_data_results(
                 if (
                     optimization_config is not None
                     and metric_name in optimization_config.metrics.keys()
-                    and not self.experiment.metrics[
-                        metric_name
-                    ].is_reconverable_fetch_e(metric_fetch_e=metric_fetch_e)
+                    and not self.experiment.metrics[metric_name].is_recoverable_fetch_e(
+                        metric_fetch_e=metric_fetch_e
+                    )
                 ):
                     status = self._mark_err_trial_status(
                         trial=self.experiment.trials[trial_index],
diff --git a/ax/storage/json_store/decoder.py b/ax/storage/json_store/decoder.py
index 0beccd47c09..e31e63a5cb3 100644
--- a/ax/storage/json_store/decoder.py
+++ b/ax/storage/json_store/decoder.py
@@ -1089,10 +1089,10 @@ def generator_spec_from_json(
         kwargs = generator_spec_json.pop("model_kwargs", None)
     else:
         kwargs = generator_spec_json.pop("generator_kwargs", None)
-    for k in _DEPRECATED_GENERATOR_KWARGS:
-        # Remove deprecated model kwargs.
-        kwargs.pop(k, None)
     if kwargs is not None:
+        for k in _DEPRECATED_GENERATOR_KWARGS:
+            # Remove deprecated model kwargs.
+            kwargs.pop(k, None)
         kwargs = _sanitize_surrogate_spec_input(object_json=kwargs)
     if "model_gen_kwargs" in generator_spec_json:
         gen_kwargs = generator_spec_json.pop("model_gen_kwargs", None)
diff --git a/ax/storage/sqa_store/db.py b/ax/storage/sqa_store/db.py
index 19d883bfd37..9da5d98e4e2 100644
--- a/ax/storage/sqa_store/db.py
+++ b/ax/storage/sqa_store/db.py
@@ -218,8 +218,8 @@ def create_all_tables(engine: Engine) -> None:
     """
     if engine.dialect.name == "mysql" and engine.dialect.default_schema_name == "ax":
         raise ValueError(
-            "The open-source Ax table creation is likely not applicable in this case,"
-            + "please contact the Adaptive Experimentation team if you need help."
+            "The open-source Ax table creation is likely not applicable in this case, "
+            "please contact the Adaptive Experimentation team if you need help."
         )
     Base.metadata.create_all(engine)
 
diff --git a/ax/storage/sqa_store/encoder.py b/ax/storage/sqa_store/encoder.py
index b96877a228f..56fbb1ddb5f 100644
--- a/ax/storage/sqa_store/encoder.py
+++ b/ax/storage/sqa_store/encoder.py
@@ -128,7 +128,7 @@ def validate_experiment_metadata(
                 raise ValueError(
                     f"An experiment already exists with the name {experiment.name}. "
                     "If you need to override this existing experiment, first delete it "
-                    "via `delete_experiment` in ax/ax/storage/sqa_store/delete.py, "
+                    "via `delete_experiment` in ax/storage/sqa_store/delete.py, "
                     "and then resave."
                 )
 
@@ -391,14 +391,15 @@ def get_metric_type_and_properties(
         json blob.
         """
         metric_class = type(metric)
-        metric_type = int(self.config.metric_registry.get(metric_class))
-        if metric_type is None:
+        metric_type_or_none = self.config.metric_registry.get(metric_class)
+        if metric_type_or_none is None:
             raise SQAEncodeError(
                 "Cannot encode metric to SQLAlchemy because metric's "
                 f"subclass ({metric_class}) is missing from the registry. "
                 "The metric registry currently contains the following: "
                 f"{','.join(map(str, self.config.metric_registry.keys()))} "
             )
+        metric_type = int(metric_type_or_none)
 
         properties = metric_class.serialize_init_args(obj=metric)
         return metric_type, object_to_json(
@@ -646,13 +647,13 @@ def outcome_constraint_to_sqa(
     def scalarized_outcome_constraint_to_sqa(
         self, outcome_constraint: ScalarizedOutcomeConstraint
     ) -> SQAMetric:
-        """Convert Ax SCalarized OutcomeConstraint to SQLAlchemy."""
+        """Convert Ax Scalarized OutcomeConstraint to SQLAlchemy."""
         metrics, weights = outcome_constraint.metrics, outcome_constraint.weights
 
         if metrics is None or weights is None or len(metrics) != len(weights):
             raise SQAEncodeError(
-                "Metrics and weights in scalarized OutcomeConstraint \
-                must be lists of equal length."
+                "Metrics and weights in scalarized OutcomeConstraint "
+                "must be lists of equal length."
             )
 
         metrics_by_name = self.get_children_metrics_by_name(
diff --git a/ax/storage/sqa_store/load.py b/ax/storage/sqa_store/load.py
index bb2f6e65b88..30c19732f30 100644
--- a/ax/storage/sqa_store/load.py
+++ b/ax/storage/sqa_store/load.py
@@ -757,7 +757,7 @@ def _query_historical_experiments_given_parameters(
                 )
             )
             .filter(SQAExperiment.is_test == False)  # noqa E712 `is` won't work for SQA
-            .filter(SQAExperiment.id is not None)
+            .filter(SQAExperiment.id.isnot(None))
             # Experiments with some data
             .join(SQAData, SQAParameter.experiment_id == SQAData.experiment_id)
         )
diff --git a/ax/storage/sqa_store/save.py b/ax/storage/sqa_store/save.py
index cd3f6ba2eb3..846150ddb8d 100644
--- a/ax/storage/sqa_store/save.py
+++ b/ax/storage/sqa_store/save.py
@@ -242,7 +242,9 @@ def trial_to_reduced_state_sqa_encoder(t: BaseTrial) -> SQATrial:
             objs=trials_to_reduce_state,
             encode_func=trial_to_reduced_state_sqa_encoder,
             decode_func=decoder.trial_from_sqa,
-            decode_args_list=[{"experiment": experiment} for _ in range(len(trials))],
+            decode_args_list=[
+                {"experiment": experiment} for _ in range(len(trials_to_reduce_state))
+            ],
             modify_sqa=add_experiment_id,
             batch_size=batch_size,
         )
@@ -251,7 +253,7 @@ def trial_to_reduced_state_sqa_encoder(t: BaseTrial) -> SQATrial:
             objs=[latest_trial],
             encode_func=encoder.trial_to_sqa,
             decode_func=decoder.trial_from_sqa,
-            decode_args_list=[{"experiment": experiment} for _ in range(len(trials))],
+            decode_args_list=[{"experiment": experiment}],
             modify_sqa=add_experiment_id,
             batch_size=batch_size,
         )
diff --git a/ax/storage/sqa_store/utils.py b/ax/storage/sqa_store/utils.py
index 3fc233ff15e..5d3d89cbf7a 100644
--- a/ax/storage/sqa_store/utils.py
+++ b/ax/storage/sqa_store/utils.py
@@ -46,7 +46,9 @@
     "_metric_fetching_errors",
     "_data_rows",
 }
-SKIP_ATTRS_ERROR_SUFFIX = "Consider adding to COPY_DB_IDS_ATTRS_TO_SKIP if appropriate."
+SKIP_ATTRS_ERROR_SUFFIX = (
+    " Consider adding to COPY_DB_IDS_ATTRS_TO_SKIP if appropriate."
+)
 
 
 def is_foreign_key_field(field: str) -> bool:
@@ -74,7 +76,7 @@ def copy_db_ids(source: Any, target: Any, path: list[str] | None = None) -> None
     if len(path) > 15:
         # This shouldn't happen, but is a precaution against accidentally
         # introducing infinite loops
-        raise SQADecodeError(error_message_prefix + "Encountered path of length > 10.")
+        raise SQADecodeError(error_message_prefix + "Encountered path of length > 15.")
 
     if type(source) is not type(target):
         if not issubclass(type(target), type(source)):
@@ -111,7 +113,7 @@ def copy_db_ids(source: Any, target: Any, path: list[str] | None = None) -> None
                 source_json = getattr(source, attr)
                 target_json = getattr(target, attr)
                 if source_json != target_json:
-                    SQADecodeError(
+                    raise SQADecodeError(
                         error_message_prefix + f"Json attribute {attr} not matching "
                         f"between source: {source_json} and target: {target_json}."
                     )
diff --git a/ax/storage/sqa_store/with_db_settings_base.py b/ax/storage/sqa_store/with_db_settings_base.py
index 0defee1c634..54de2bd8486 100644
--- a/ax/storage/sqa_store/with_db_settings_base.py
+++ b/ax/storage/sqa_store/with_db_settings_base.py
@@ -105,8 +105,9 @@ def __init__(
         if db_settings and (not DBSettings or not isinstance(db_settings, DBSettings)):
             raise ValueError(
                 "`db_settings` argument should be of type ax.storage.sqa_store."
-                f"(Got: {db_settings} of type {type(db_settings)}. "
-                "structs.DBSettings. To use `DBSettings`, you will need SQLAlchemy "
+                "structs.DBSettings. "
+                f"(Got: {db_settings} of type {type(db_settings)}). "
+                "To use `DBSettings`, you will need SQLAlchemy "
                 "installed in your environment (can be installed through pip)."
             )
         self._db_settings = db_settings or self._get_default_db_settings()