diff --git a/src/actions/users.ts b/src/actions/users.ts
index 47b396df9..caec9bc46 100644
--- a/src/actions/users.ts
+++ b/src/actions/users.ts
@@ -363,7 +363,7 @@ export async function addUser(data: {
       providerGroup: validatedData.providerGroup || null,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
       limit5hUsd: validatedData.limit5hUsd ?? undefined,
       limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
       limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
@@ -545,7 +545,7 @@ export async function createUserOnly(data: {
       providerGroup: validatedData.providerGroup || null,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
       limit5hUsd: validatedData.limit5hUsd ?? undefined,
       limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
       limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
@@ -698,12 +698,12 @@ export async function editUser(
       providerGroup: validatedData.providerGroup,
       tags: validatedData.tags,
       rpm: validatedData.rpm,
-      dailyQuota: validatedData.dailyQuota,
-      limit5hUsd: validatedData.limit5hUsd,
-      limitWeeklyUsd: validatedData.limitWeeklyUsd,
-      limitMonthlyUsd: validatedData.limitMonthlyUsd,
-      limitTotalUsd: validatedData.limitTotalUsd,
-      limitConcurrentSessions: validatedData.limitConcurrentSessions,
+      dailyQuota: validatedData.dailyQuota ?? undefined,
+      limit5hUsd: validatedData.limit5hUsd ?? undefined,
+      limitWeeklyUsd: validatedData.limitWeeklyUsd ?? undefined,
+      limitMonthlyUsd: validatedData.limitMonthlyUsd ?? undefined,
+      limitTotalUsd: validatedData.limitTotalUsd ?? undefined,
+      limitConcurrentSessions: validatedData.limitConcurrentSessions ?? undefined,
       dailyResetMode: validatedData.dailyResetMode,
       dailyResetTime: validatedData.dailyResetTime,
       isEnabled: validatedData.isEnabled,
diff --git a/src/app/[locale]/dashboard/_components/user/forms/key-edit-section.tsx b/src/app/[locale]/dashboard/_components/user/forms/key-edit-section.tsx
index cc79b8e7b..c8e17f59f 100644
--- a/src/app/[locale]/dashboard/_components/user/forms/key-edit-section.tsx
+++ b/src/app/[locale]/dashboard/_components/user/forms/key-edit-section.tsx
@@ -42,7 +42,10 @@ export interface KeyEditSectionProps {
   };
   /** providerGroup 为 admin-only 字段：非管理员仅可查看不可编辑 */
   isAdmin?: boolean;
-  onChange: (field: string, value: any) => void;
+  onChange: {
+    (field: string, value: any): void;
+    (updates: Record<string, any>): void;
+  };
   scrollRef?: React.RefObject<HTMLDivElement>;
   translations: {
     sections: {
diff --git a/src/app/[locale]/dashboard/_components/user/forms/limit-rule-picker.tsx b/src/app/[locale]/dashboard/_components/user/forms/limit-rule-picker.tsx
index 5aea38f1e..d30d67450 100644
--- a/src/app/[locale]/dashboard/_components/user/forms/limit-rule-picker.tsx
+++ b/src/app/[locale]/dashboard/_components/user/forms/limit-rule-picker.tsx
@@ -1,7 +1,7 @@
 "use client";
 
-import { useEffect, useMemo, useState } from "react";
 import { AlertTriangle } from "lucide-react";
+import { useEffect, useMemo, useState } from "react";
 import { Button } from "@/components/ui/button";
 import {
   Dialog,
diff --git a/src/app/[locale]/dashboard/_components/user/forms/user-edit-section.tsx b/src/app/[locale]/dashboard/_components/user/forms/user-edit-section.tsx
index fd4ffad8d..68542510e 100644
--- a/src/app/[locale]/dashboard/_components/user/forms/user-edit-section.tsx
+++ b/src/app/[locale]/dashboard/_components/user/forms/user-edit-section.tsx
@@ -48,7 +48,10 @@ export interface UserEditSectionProps {
   onToggleEnabled?: () => Promise<void>;
   showProviderGroup?: boolean;
   modelSuggestions?: string[];
-  onChange: (field: string, value: any) => void;
+  onChange: {
+    (field: string, value: any): void;
+    (updates: Record<string, any>): void;
+  };
   translations: {
     sections: {
       basicInfo: string;
@@ -142,8 +145,15 @@ export function UserEditSection({
   const [toggleConfirmOpen, setToggleConfirmOpen] = useState(false);
   const [isToggling, setIsToggling] = useState(false);
 
-  const emitChange = (field: string, value: any) => {
-    onChange(field, value);
+  const emitChange = (field: string | Record<string, any>, value?: any) => {
+    if (typeof field === "object") {
+      // Batch update - call onChange for each field
+      Object.entries(field).forEach(([key, val]) => {
+        (onChange as (f: string, v: any) => void)(key, val);
+      });
+    } else {
+      (onChange as (f: string, v: any) => void)(field, value);
+    }
   };
 
   const handleToggleEnabled = async () => {
diff --git a/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx b/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
index 017d113d2..8782587ef 100644
--- a/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
+++ b/src/app/[locale]/dashboard/_components/user/forms/user-form.tsx
@@ -118,7 +118,7 @@ export function UserForm({ user, onSuccess, currentUser }: UserFormProps) {
               name: data.name,
               note: data.note,
               rpm: data.rpm,
-              dailyQuota: data.dailyQuota,
+              dailyQuota: data.dailyQuota ?? undefined,
               providerGroup: data.providerGroup || null,
               tags: data.tags,
               limit5hUsd: data.limit5hUsd,
@@ -136,7 +136,7 @@ export function UserForm({ user, onSuccess, currentUser }: UserFormProps) {
               name: data.name,
               note: data.note,
               rpm: data.rpm,
-              dailyQuota: data.dailyQuota,
+              dailyQuota: data.dailyQuota ?? undefined,
               providerGroup: data.providerGroup || null,
               tags: data.tags,
               limit5hUsd: data.limit5hUsd,
diff --git a/src/app/[locale]/dashboard/_components/user/unified-edit-dialog.tsx b/src/app/[locale]/dashboard/_components/user/unified-edit-dialog.tsx
index d673d91ce..c32517307 100644
--- a/src/app/[locale]/dashboard/_components/user/unified-edit-dialog.tsx
+++ b/src/app/[locale]/dashboard/_components/user/unified-edit-dialog.tsx
@@ -891,7 +891,9 @@ function UnifiedEditDialogInner({
                             limitConcurrentSessions: key.limitConcurrentSessions ?? 0,
                           }}
                           isAdmin={isAdmin}
-                          onChange={(field, value) => handleKeyChange(key.id, field, value)}
+                          onChange={(field: string | Record<string, any>, value?: any) =>
+                            handleKeyChange(key.id, field, value)
+                          }
                           scrollRef={
                             scrollToKeyId === key.id || newlyAddedKeyId === key.id
                               ? keyScrollRef
diff --git a/src/repository/user.ts b/src/repository/user.ts
index ad220ce7c..d511e6225 100644
--- a/src/repository/user.ts
+++ b/src/repository/user.ts
@@ -157,17 +157,18 @@ export async function updateUser(id: number, userData: UpdateUserData): Promise<
   if (userData.description !== undefined) dbData.description = userData.description;
   if (userData.rpm !== undefined) dbData.rpmLimit = userData.rpm;
   if (userData.dailyQuota !== undefined)
-    dbData.dailyLimitUsd = userData.dailyQuota === null ? null : userData.dailyQuota.toString();
+    dbData.dailyLimitUsd =
+      userData.dailyQuota === null ? undefined : userData.dailyQuota.toString();
   if (userData.providerGroup !== undefined) dbData.providerGroup = userData.providerGroup;
   if (userData.tags !== undefined) dbData.tags = userData.tags;
   if (userData.limit5hUsd !== undefined)
-    dbData.limit5hUsd = userData.limit5hUsd === null ? null : userData.limit5hUsd.toString();
+    dbData.limit5hUsd = userData.limit5hUsd === null ? undefined : userData.limit5hUsd.toString();
   if (userData.limitWeeklyUsd !== undefined)
     dbData.limitWeeklyUsd =
-      userData.limitWeeklyUsd === null ? null : userData.limitWeeklyUsd.toString();
+      userData.limitWeeklyUsd === null ? undefined : userData.limitWeeklyUsd.toString();
   if (userData.limitMonthlyUsd !== undefined)
     dbData.limitMonthlyUsd =
-      userData.limitMonthlyUsd === null ? null : userData.limitMonthlyUsd.toString();
+      userData.limitMonthlyUsd === null ? undefined : userData.limitMonthlyUsd.toString();
   if (userData.limitTotalUsd !== undefined)
     dbData.limitTotalUsd =
       userData.limitTotalUsd === null ? null : userData.limitTotalUsd.toString();