chore(): minor fixes around codebase

src/backend/api/v1/events/endpoints.py

@@ -5,7 +5,6 @@ from django.http import Http404, HttpRequest
 from ninja import Router
 from prometheus_client import Counter
 
-from api.v1.auth.endpoints import jwt_bearer
 from api.v1.events.schemas import (
     EventErrorOut,
     EventTypeCreateIn,
@@ -21,6 +20,7 @@ from apps.events.services import (
     event_type_update,
     process_events_batch,
 )
+from apps.users.auth.bearer import jwt_bearer
 
 EVENTS_INGESTED = Counter(
     "lotty_events_ingested_total",
@@ -62,9 +62,7 @@ def list_event_types(
     is_active: bool | None = None,  # noqa: FBT001
 ) -> tuple[int, list[EventTypeOut]]:
     qs = event_type_list(is_active=is_active)
-    return HTTPStatus.OK, [
-        EventTypeOut.model_validate(metric) for metric in qs
-    ]
+    return HTTPStatus.OK, [EventTypeOut.model_validate(et) for et in qs]
 
 
 @router.get(

src/backend/api/v1/notifications/endpoints.py

@@ -132,7 +132,7 @@ def create_rule(
         try:
             experiment = Experiment.objects.get(pk=payload.experiment_id)
         except Experiment.DoesNotExist:
-            raise Http404 from Experiment.DoesNotExist
+            raise Http404 from None
 
     r = rule_create(
         event_type=payload.event_type,

src/backend/api/v1/reports/endpoints.py

@@ -1,14 +1,15 @@
 from http import HTTPStatus
 from uuid import UUID
 
+from django.core.exceptions import ValidationError
 from django.http import Http404, HttpRequest
 from django.utils.dateparse import parse_datetime
 from ninja import Router
 
-from api.v1.auth.endpoints import jwt_bearer
 from api.v1.reports.schemas import ExperimentReportOut
 from apps.experiments.models import Experiment
 from apps.reports.services import build_experiment_report
+from apps.users.auth.bearer import jwt_bearer
 
 router = Router(tags=["reports"], auth=jwt_bearer)
 
@@ -34,11 +35,15 @@ def get_experiment_report(
     if start_date:
         parsed_start = parse_datetime(start_date)
         if parsed_start is None:
-            raise Http404
+            raise ValidationError(
+                {"start_date": "Must be a valid ISO 8601 datetime."}
+            )
     if end_date:
         parsed_end = parse_datetime(end_date)
         if parsed_end is None:
-            raise Http404
+            raise ValidationError(
+                {"end_date": "Must be a valid ISO 8601 datetime."}
+            )
 
     report_data = build_experiment_report(
         experiment=experiment,

src/backend/api/v1/reviews/endpoints.py

@@ -247,7 +247,7 @@ def remove_approver_from_group(
     description=(
         "Retrieve the approver group assigned to a specific experimenter. "
         "Returns 404 if no explicit group exists. "
-        "Available to any authenticated user."
+        "Admin only."
     ),
 )
 @require_admin