diff --git a/.drone.yml b/.drone.yml
index 027ff27..483cb38 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -5,7 +5,7 @@ name: default
 
 steps:
   - name: test & build
-    image: node:18.16.0-bullseye
+    image: node:18.16.1-bookworm
     commands:
       # - git config --global --add safe.directory "/drone/src"
       - corepack enable
@@ -17,7 +17,7 @@ steps:
       npm_config_registry: https://registry.npmmirror.com
 
   - name: publish
-    image: node:18.16.0-bullseye
+    image: node:18.16.1-bookworm
     environment:
       DRONE_GITEA_SERVER: https://git.unlock-music.dev
       GITEA_API_KEY:
diff --git a/src/components/ImportSecretModal.tsx b/src/components/ImportSecretModal.tsx
index 2a83999..2dd9870 100644
--- a/src/components/ImportSecretModal.tsx
+++ b/src/components/ImportSecretModal.tsx
@@ -28,7 +28,7 @@ export function ImportSecretModal({ clientName, children, show, onClose, onImpor
     <Modal isOpen={show} onClose={onClose} closeOnOverlayClick={false} scrollBehavior="inside" size="xl">
       <ModalOverlay />
       <ModalContent>
-        <ModalHeader>导入密钥数据库</ModalHeader>
+        <ModalHeader>从文件导入密钥</ModalHeader>
         <ModalCloseButton />
         <Flex as={ModalBody} gap={2} flexDir="column" flex={1}>
           <Center>
diff --git a/src/crypto/pasreKuwo.ts b/src/crypto/parseKuwo.ts
similarity index 100%
rename from src/crypto/pasreKuwo.ts
rename to src/crypto/parseKuwo.ts
diff --git a/src/features/settings/Settings.tsx b/src/features/settings/Settings.tsx
index a59155b..6e3ab6a 100644
--- a/src/features/settings/Settings.tsx
+++ b/src/features/settings/Settings.tsx
@@ -1,4 +1,5 @@
 import {
+  chakra,
   Box,
   Button,
   Center,
@@ -20,13 +21,15 @@ import {
   Text,
   VStack,
   useBreakpointValue,
+  useToast,
 } from '@chakra-ui/react';
 import { PanelQMCv2Key } from './panels/PanelQMCv2Key';
 import { useState } from 'react';
 import { MdExpandMore, MdMenu, MdOutlineSettingsBackupRestore } from 'react-icons/md';
-import { useAppDispatch } from '~/hooks';
+import { useAppDispatch, useAppSelector } from '~/hooks';
 import { commitStagingChange, discardStagingChanges } from './settingsSlice';
 import { PanelKWMv2Key } from './panels/PanelKWMv2Key';
+import { selectIsSettingsNotSaved } from './settingsSelector';
 
 const TABS: { name: string; Tab: () => JSX.Element }[] = [
   { name: 'QMCv2 密钥', Tab: PanelQMCv2Key },
@@ -38,6 +41,7 @@ const TABS: { name: string; Tab: () => JSX.Element }[] = [
 ];
 
 export function Settings() {
+  const toast = useToast();
   const dispatch = useAppDispatch();
   const isLargeWidthDevice =
     useBreakpointValue({
@@ -49,8 +53,25 @@ export function Settings() {
   const handleTabChange = (idx: number) => {
     setTabIndex(idx);
   };
-  const handleResetSettings = () => dispatch(discardStagingChanges());
-  const handleApplySettings = () => dispatch(commitStagingChange());
+  const handleResetSettings = () => {
+    dispatch(discardStagingChanges());
+
+    toast({
+      status: 'info',
+      title: '未储存的设定已舍弃',
+      description: '已还原到更改前的状态。',
+      isClosable: true,
+    });
+  };
+  const handleApplySettings = () => {
+    dispatch(commitStagingChange());
+    toast({
+      status: 'success',
+      title: '设定已应用',
+      isClosable: true,
+    });
+  };
+  const isSettingsNotSaved = useAppSelector(selectIsSettingsNotSaved);
 
   return (
     <Flex flexDir="column" flex={1}>
@@ -104,7 +125,16 @@ export function Settings() {
               <VStack mt="4" alignItems="flex-start" w="full">
                 <Flex flexDir="row" gap="2" w="full">
                   <Center>
-                    <Box color="gray">设置会在保存后生效。</Box>
+                    {isSettingsNotSaved ? (
+                      <Box color="gray">
+                        有未储存的更改{' '}
+                        <chakra.span color="red" wordBreak="keep-all">
+                          设定将在保存后生效
+                        </chakra.span>
+                      </Box>
+                    ) : (
+                      <Box color="gray">设定将在保存后生效</Box>
+                    )}
                   </Center>
                   <Spacer />
                   <HStack gap="2" justifyContent="flex-end">
diff --git a/src/features/settings/panels/KWMv2/KWMv2EKeyItem.tsx b/src/features/settings/panels/KWMv2/KWMv2EKeyItem.tsx
index 35244b4..f9969a2 100644
--- a/src/features/settings/panels/KWMv2/KWMv2EKeyItem.tsx
+++ b/src/features/settings/panels/KWMv2/KWMv2EKeyItem.tsx
@@ -53,7 +53,12 @@ export const KWMv2EKeyItem = memo(({ id, ekey, quality, rid, i }: StagingKWMv2Ke
             <InputLeftElement pr="2">
               <Icon as={MdVpnKey} />
             </InputLeftElement>
-            <Input variant="flushed" placeholder="密钥" value={ekey} onChange={(e) => updateKey('ekey', e)} />
+            <Input
+              variant="flushed"
+              placeholder="密钥，通常包含 364 或 704 位字符，没有空格。"
+              value={ekey}
+              onChange={(e) => updateKey('ekey', e)}
+            />
             <InputRightElement>
               <Text pl="2" color={ekey.length ? 'green.500' : 'red.500'}>
                 <code>{ekey.length || '?'}</code>
diff --git a/src/features/settings/panels/PanelKWMv2Key.tsx b/src/features/settings/panels/PanelKWMv2Key.tsx
index 9c41ac4..ba6d4e7 100644
--- a/src/features/settings/panels/PanelKWMv2Key.tsx
+++ b/src/features/settings/panels/PanelKWMv2Key.tsx
@@ -49,8 +49,14 @@ export function PanelKWMv2Key() {
       const fileBuffer = await file.arrayBuffer();
       keys = MMKVParser.parseKuwoEKey(new DataView(fileBuffer));
     }
-
-    if (keys) {
+    if (keys?.length === 0) {
+      toast({
+        title: '未导入密钥',
+        description: '选择的密钥数据库文件未发现任何可用的密钥。',
+        isClosable: true,
+        status: 'warning',
+      });
+    } else if (keys) {
       dispatch(kwm2ImportKeys(keys));
       setShowImportModal(false);
       toast({
@@ -88,7 +94,7 @@ export function PanelKWMv2Key() {
             <MenuButton as={IconButton} icon={<MdExpandMore />}></MenuButton>
             <MenuList>
               <MenuItem onClick={() => setShowImportModal(true)} icon={<Icon as={MdFileUpload} boxSize={5} />}>
-                从文件导入密钥
+                从文件导入密钥…
               </MenuItem>
               <MenuDivider />
               <MenuItem color="red" onClick={clearAll} icon={<Icon as={MdDeleteForever} boxSize={5} />}>
diff --git a/src/features/settings/panels/PanelQMCv2Key.tsx b/src/features/settings/panels/PanelQMCv2Key.tsx
index 2d9d67a..c309b2c 100644
--- a/src/features/settings/panels/PanelQMCv2Key.tsx
+++ b/src/features/settings/panels/PanelQMCv2Key.tsx
@@ -71,14 +71,20 @@ export function PanelQMCv2Key() {
         qmc2Keys = Array.from(map.entries(), ([name, ekey]) => ({ name: getFileName(name), ekey }));
       }
 
-      if (qmc2Keys) {
+      if (qmc2Keys?.length === 0) {
+        toast({
+          title: '未导入密钥',
+          description: '选择的密钥数据库文件未发现任何可用的密钥。',
+          isClosable: true,
+          status: 'warning',
+        });
+      } else if (qmc2Keys) {
         dispatch(qmc2ImportKeys(qmc2Keys));
         setShowImportModal(false);
         toast({
           title: `导入成功 (${qmc2Keys.length})`,
           description: '记得保存更改来应用。',
           isClosable: true,
-          duration: 5000,
           status: 'success',
         });
       } else {
@@ -93,7 +99,7 @@ export function PanelQMCv2Key() {
   return (
     <Flex minH={0} flexDir="column" flex={1}>
       <Heading as="h2" size="lg">
-        QMCv2 密钥
+        QMCv2 解密密钥
       </Heading>
 
       <Text>
@@ -110,7 +116,7 @@ export function PanelQMCv2Key() {
             <MenuButton as={IconButton} icon={<MdExpandMore />}></MenuButton>
             <MenuList>
               <MenuItem onClick={() => setShowImportModal(true)} icon={<Icon as={MdFileUpload} boxSize={5} />}>
-                从文件导入密钥
+                从文件导入密钥…
               </MenuItem>
               <MenuDivider />
               <MenuItem color="red" onClick={clearAll} icon={<Icon as={MdDeleteForever} boxSize={5} />}>
@@ -141,6 +147,7 @@ export function PanelQMCv2Key() {
                   」算法计算相似程度。
                 </Text>
                 <Text>若密钥数量过多，匹配时可能会造成浏览器卡顿或无响应一段时间。</Text>
+                <Text>若不确定，请勾选该项。</Text>
               </Box>
             }
           >
diff --git a/src/features/settings/panels/QMCv2/QMCv2EKeyItem.tsx b/src/features/settings/panels/QMCv2/QMCv2EKeyItem.tsx
index bf133d0..305e4de 100644
--- a/src/features/settings/panels/QMCv2/QMCv2EKeyItem.tsx
+++ b/src/features/settings/panels/QMCv2/QMCv2EKeyItem.tsx
@@ -30,13 +30,23 @@ export const QMCv2EKeyItem = memo(({ id, name, ekey, i }: { id: string; name: st
         </Text>
 
         <VStack flex={1}>
-          <Input variant="flushed" placeholder="文件名" value={name} onChange={(e) => updateKey('name', e)} />
+          <Input
+            variant="flushed"
+            placeholder="文件名，包括后缀名。如 “AAA - BBB.mflac”"
+            value={name}
+            onChange={(e) => updateKey('name', e)}
+          />
 
           <InputGroup size="xs">
             <InputLeftElement pr="2">
               <Icon as={MdVpnKey} />
             </InputLeftElement>
-            <Input variant="flushed" placeholder="密钥" value={ekey} onChange={(e) => updateKey('ekey', e)} />
+            <Input
+              variant="flushed"
+              placeholder="密钥，通常包含 364 或 704 位字符，没有空格。"
+              value={ekey}
+              onChange={(e) => updateKey('ekey', e)}
+            />
             <InputRightElement>
               <Text pl="2" color={ekey.length ? 'green.500' : 'red.500'}>
                 <code>{ekey.length || '?'}</code>
diff --git a/src/features/settings/settingsSelector.ts b/src/features/settings/settingsSelector.ts
index 42d61b7..6b695e5 100644
--- a/src/features/settings/settingsSelector.ts
+++ b/src/features/settings/settingsSelector.ts
@@ -1,9 +1,11 @@
-import { parseKuwoHeader } from '~/crypto/pasreKuwo';
+import { parseKuwoHeader } from '~/crypto/parseKuwo';
 import type { RootState } from '~/store';
 import { closestByLevenshtein } from '~/util/levenshtein';
 import { hasOwn } from '~/util/objects';
 import { kwm2StagingToProductionKey } from './keyFormats';
 
+export const selectIsSettingsNotSaved = (state: RootState) => state.settings.dirty;
+
 export const selectStagingQMCv2Settings = (state: RootState) => state.settings.staging.qmc2;
 export const selectFinalQMCv2Settings = (state: RootState) => state.settings.production.qmc2;
 
diff --git a/src/features/settings/settingsSlice.ts b/src/features/settings/settingsSlice.ts
index e5722e2..10bbaf1 100644
--- a/src/features/settings/settingsSlice.ts
+++ b/src/features/settings/settingsSlice.ts
@@ -37,16 +37,18 @@ export interface ProductionSettings {
 }
 
 export interface SettingsState {
+  dirty: boolean;
   staging: StagingSettings;
   production: ProductionSettings;
 }
 const initialState: SettingsState = {
+  dirty: false,
   staging: {
-    qmc2: { allowFuzzyNameSearch: false, keys: [] },
+    qmc2: { allowFuzzyNameSearch: true, keys: [] },
     kwm2: { keys: [] },
   },
   production: {
-    qmc2: { allowFuzzyNameSearch: false, keys: {} },
+    qmc2: { allowFuzzyNameSearch: true, keys: {} },
     kwm2: { keys: {} },
   },
 };
@@ -77,6 +79,7 @@ export const settingsSlice = createSlice({
   reducers: {
     setProductionChanges: (_state, { payload }: PayloadAction<ProductionSettings>) => {
       return {
+        dirty: false,
         production: payload,
         staging: productionToStaging(payload),
       };
@@ -84,14 +87,17 @@ export const settingsSlice = createSlice({
     //
     qmc2AddKey(state) {
       state.staging.qmc2.keys.push({ id: nanoid(), name: '', ekey: '' });
+      state.dirty = true;
     },
     qmc2ImportKeys(state, { payload }: PayloadAction<Omit<StagingQMCv2Key, 'id'>[]>) {
       const newItems = payload.map((item) => ({ id: nanoid(), ...item }));
       state.staging.qmc2.keys.push(...newItems);
+      state.dirty = true;
     },
     qmc2DeleteKey(state, { payload: { id } }: PayloadAction<{ id: string }>) {
       const qmc2 = state.staging.qmc2;
       qmc2.keys = qmc2.keys.filter((item) => item.id !== id);
+      state.dirty = true;
     },
     qmc2UpdateKey(
       state,
@@ -100,25 +106,31 @@ export const settingsSlice = createSlice({
       const keyItem = state.staging.qmc2.keys.find((item) => item.id === id);
       if (keyItem) {
         keyItem[field] = value;
+        state.dirty = true;
       }
     },
     qmc2ClearKeys(state) {
       state.staging.qmc2.keys = [];
+      state.dirty = true;
     },
     qmc2AllowFuzzyNameSearch(state, { payload: { enable } }: PayloadAction<{ enable: boolean }>) {
       state.staging.qmc2.allowFuzzyNameSearch = enable;
+      state.dirty = true;
     },
     // TODO: reuse the logic somehow?
     kwm2AddKey(state) {
       state.staging.kwm2.keys.push({ id: nanoid(), ekey: '', quality: '', rid: '' });
+      state.dirty = true;
     },
     kwm2ImportKeys(state, { payload }: PayloadAction<Omit<StagingKWMv2Key, 'id'>[]>) {
       const newItems = payload.map((item) => ({ id: nanoid(), ...item }));
       state.staging.kwm2.keys.push(...newItems);
+      state.dirty = true;
     },
     kwm2DeleteKey(state, { payload: { id } }: PayloadAction<{ id: string }>) {
       const kwm2 = state.staging.kwm2;
       kwm2.keys = kwm2.keys.filter((item) => item.id !== id);
+      state.dirty = true;
     },
     kwm2UpdateKey(
       state,
@@ -127,18 +139,22 @@ export const settingsSlice = createSlice({
       const keyItem = state.staging.kwm2.keys.find((item) => item.id === id);
       if (keyItem) {
         keyItem[field] = value;
+        state.dirty = true;
       }
     },
     kwm2ClearKeys(state) {
       state.staging.kwm2.keys = [];
+      state.dirty = true;
     },
     //
     discardStagingChanges: (state) => {
+      state.dirty = false;
       state.staging = productionToStaging(state.production);
     },
     commitStagingChange: (state) => {
       const production = stagingToProduction(state.staging);
       return {
+        dirty: false,
         // Sync back to staging
         staging: productionToStaging(production),
         production,
diff --git a/src/util/DatabaseKeyExtractor.ts b/src/util/DatabaseKeyExtractor.ts
index 5158820..0a4b8e9 100644
--- a/src/util/DatabaseKeyExtractor.ts
+++ b/src/util/DatabaseKeyExtractor.ts
@@ -32,7 +32,12 @@ export class DatabaseKeyExtractor {
         return null;
       }
 
-      const keys = db.exec('select file_path, ekey from `audio_file_ekey_table`')[0].values;
+      const result = db.exec('select file_path, ekey from audio_file_ekey_table');
+      if (result.length === 0) {
+        return [];
+      }
+
+      const keys = result[0].values;
       return keys.map(([path, ekey]) => ({
         // strip dir name
         name: getFileName(String(path)),