diff --git a/controller/log.go b/controller/log.go
index a43f7b75..ce9b4666 100644
--- a/controller/log.go
+++ b/controller/log.go
@@ -150,6 +150,10 @@ func GetLogsSelfStat(c *gin.Context) {
 	return
 }
 
+// DeleteHistoryLogs is the legacy synchronous log cleanup endpoint (DELETE /api/log/).
+// It deletes directly instead of going through the async system task. It is kept only
+// for the classic frontend; the default frontend uses POST /api/system-task/log-cleanup.
+// TODO: remove this handler (and its route) once the classic frontend is removed.
 func DeleteHistoryLogs(c *gin.Context) {
 	targetTimestamp, _ := strconv.ParseInt(c.Query("target_timestamp"), 10, 64)
 	if targetTimestamp == 0 {
diff --git a/router/api-router.go b/router/api-router.go
index e16fd285..63401967 100644
--- a/router/api-router.go
+++ b/router/api-router.go
@@ -304,6 +304,8 @@ func SetApiRouter(router *gin.Engine) {
 		}
 		logRoute := apiRouter.Group("/log")
 		logRoute.GET("/", middleware.AdminAuth(), controller.GetAllLogs)
+		// Legacy synchronous direct-delete route used only by the classic frontend.
+		// TODO: remove once the classic frontend is removed; the default frontend uses /system-task/log-cleanup.
 		logRoute.DELETE("/", middleware.RootAuth(), controller.DeleteHistoryLogs)
 		logRoute.GET("/stat", middleware.AdminAuth(), controller.GetLogsStat)
 		logRoute.GET("/self/stat", middleware.UserAuth(), controller.GetLogsSelfStat)
diff --git a/web/default/src/features/system-settings/api.ts b/web/default/src/features/system-settings/api.ts
index d942634f..3ca59a77 100644
--- a/web/default/src/features/system-settings/api.ts
+++ b/web/default/src/features/system-settings/api.ts
@@ -19,7 +19,6 @@ For commercial licensing, please contact support@quantumnous.com
 import { api } from '@/lib/api'
 import type {
   ConfirmPaymentComplianceResponse,
-  DeleteLogsResponse,
   FetchUpstreamRatiosRequest,
   LogCleanupTask,
   SystemOptionsResponse,
@@ -48,13 +47,6 @@ export async function confirmPaymentCompliance() {
   return res.data
 }
 
-export async function deleteLogsBefore(targetTimestamp: number) {
-  const res = await api.delete<DeleteLogsResponse>('/api/log/', {
-    params: { target_timestamp: targetTimestamp },
-  })
-  return res.data
-}
-
 export async function startLogCleanupTask(targetTimestamp: number) {
   const res = await api.post<SystemTaskResponse<LogCleanupTask>>(
     '/api/system-task/log-cleanup',
diff --git a/web/default/src/features/system-settings/types.ts b/web/default/src/features/system-settings/types.ts
index 28acd48e..abcb97d0 100644
--- a/web/default/src/features/system-settings/types.ts
+++ b/web/default/src/features/system-settings/types.ts
@@ -50,12 +50,6 @@ export type ConfirmPaymentComplianceResponse = {
   }
 }
 
-export type DeleteLogsResponse = {
-  success: boolean
-  message: string
-  data?: number
-}
-
 export type SystemTaskStatus = 'pending' | 'running' | 'succeeded' | 'failed'
 
 export type SystemTask<