diff --git a/litellm/proxy/spend_tracking/spend_management_endpoints.py b/litellm/proxy/spend_tracking/spend_management_endpoints.py
index 9c9bfb554de..b673d98a64c 100644
--- a/litellm/proxy/spend_tracking/spend_management_endpoints.py
+++ b/litellm/proxy/spend_tracking/spend_management_endpoints.py
@@ -2250,9 +2250,8 @@ async def ui_view_spend_logs(
         description="Sort order: asc or desc",
     ),
     filter_time_by: str | None = fastapi.Query(
-        default="startTime",
-        description="Filter field for date range: 'startTime' (default) or 'endTime'"
-    )
+        default="startTime", description="Filter field for date range: 'startTime' (default) or 'endTime'"
+    ),
 ):
     """
     View spend logs with pagination support.
@@ -2307,7 +2306,7 @@ async def ui_view_spend_logs(
         )
 
     # Validate filter_time_by
-    valid_filter_fields = {"startTime", "endTime"}
+    valid_filter_fields: Final = ("startTime", "endTime")
     if filter_time_by not in valid_filter_fields:
         raise ProxyException(
             message=f"Invalid filter_time_by: {filter_time_by}. Must be one of: {', '.join(sorted(valid_filter_fields))}",
@@ -2315,7 +2314,7 @@ async def ui_view_spend_logs(
             param="filter_time_by",
             code=status.HTTP_400_BAD_REQUEST,
         )
-    filter_time_field = "startTime" if filter_time_by == "startTime" else "endTime"
+    filter_time_field: Final = "startTime" if filter_time_by == "startTime" else "endTime"
 
     try:
         is_admin_view: Final = _is_admin_view_safe(user_api_key_dict=user_api_key_dict)
diff --git a/ui/litellm-dashboard/src/lib/http/schema.d.ts b/ui/litellm-dashboard/src/lib/http/schema.d.ts
index 326dfb80a7e..295405ef166 100644
--- a/ui/litellm-dashboard/src/lib/http/schema.d.ts
+++ b/ui/litellm-dashboard/src/lib/http/schema.d.ts
@@ -51494,6 +51494,8 @@ export interface operations {
                 sort_by?: string;
                 /** @description Sort order: asc or desc */
                 sort_order?: string | null;
+                /** @description Filter field for date range: 'startTime' (default) or 'endTime' */
+                filter_time_by?: string | null;
             };
             header?: never;
             path?: never;
@@ -51602,6 +51604,8 @@ export interface operations {
                 sort_by?: string;
                 /** @description Sort order: asc or desc */
                 sort_order?: string | null;
+                /** @description Filter field for date range: 'startTime' (default) or 'endTime' */
+                filter_time_by?: string | null;
             };
             header?: never;
             path?: never;