chore(): minor fixes around codebase

src/backend/apps/guardrails/services.py

@@ -28,11 +28,6 @@ from apps.notifications.services import (
 )
 from apps.reports.services import calculate_metric_value
 
-_ACTION_SEVERITY = {
-    GuardrailAction.ROLLBACK: 0,
-    GuardrailAction.PAUSE: 1,
-}
-
 
 @transaction.atomic
 def guardrail_create(
@@ -69,6 +64,7 @@ def guardrail_update(
     guardrail: Guardrail,
     **fields: Any,
 ) -> Guardrail:
+    guardrail.experiment.refresh_from_db(fields=["status"])
     if guardrail.experiment.status in STARTED_STATUSES:
         raise ValidationError(
             {
@@ -96,6 +92,7 @@ def guardrail_update(
 
 
 def guardrail_delete(*, guardrail: Guardrail) -> None:
+    guardrail.experiment.refresh_from_db(fields=["status"])
     if guardrail.experiment.status in STARTED_STATUSES:
         raise ValidationError(
             {
@@ -171,7 +168,7 @@ def _execute_guardrail_action(
     guardrail: Guardrail,
     experiment: Experiment,
     actual_value: Decimal,
-) -> GuardrailTrigger:
+) -> GuardrailTrigger | None:
     now = timezone.now()
 
     experiment = Experiment.objects.select_for_update().get(pk=experiment.pk)