diff --git a/frontend/web/src/components/setting/PreferenceSection.tsx b/frontend/web/src/components/setting/PreferenceSection.tsx
index a59a340..7b02b25 100644
--- a/frontend/web/src/components/setting/PreferenceSection.tsx
+++ b/frontend/web/src/components/setting/PreferenceSection.tsx
@@ -2,7 +2,7 @@ import { Option, Select } from "@mui/joy";
 import { useTranslation } from "react-i18next";
 import BetaBadge from "@/components/BetaBadge";
 import { useUserStore } from "@/stores";
-import { UserSetting, UserSetting_ColorTheme, UserSetting_Locale } from "@/types/proto/api/v1/user_setting_service";
+import { UserSetting } from "@/types/proto/api/v1/user_setting_service";
 
 const PreferenceSection: React.FC = () => {
   const { t } = useTranslation();
@@ -13,39 +13,39 @@ const PreferenceSection: React.FC = () => {
 
   const languageOptions = [
     {
-      value: UserSetting_Locale.LOCALE_EN,
+      value: "EN",
       label: "English",
     },
     {
-      value: UserSetting_Locale.LOCALE_ZH,
+      value: "ZH",
       label: "中文",
     },
     {
-      value: UserSetting_Locale.LOCALE_FR,
+      value: "FR",
       label: "Français",
     },
     {
-      value: UserSetting_Locale.LOCALE_JA,
+      value: "JA",
       label: "日本語",
     },
   ];
 
   const colorThemeOptions = [
     {
-      value: UserSetting_ColorTheme.COLOR_THEME_SYSTEM,
+      value: "SYSTEM",
       label: "System",
     },
     {
-      value: UserSetting_ColorTheme.COLOR_THEME_LIGHT,
+      value: "LIGHT",
       label: "Light",
     },
     {
-      value: UserSetting_ColorTheme.COLOR_THEME_DARK,
+      value: "DARK",
       label: "Dark",
     },
   ];
 
-  const handleSelectLanguage = async (locale: UserSetting_Locale) => {
+  const handleSelectLanguage = async (locale: string) => {
     await userStore.updateUserSetting(
       {
         ...userSetting,
@@ -55,7 +55,7 @@ const PreferenceSection: React.FC = () => {
     );
   };
 
-  const handleSelectColorTheme = async (colorTheme: UserSetting_ColorTheme) => {
+  const handleSelectColorTheme = async (colorTheme: string) => {
     await userStore.updateUserSetting(
       {
         ...userSetting,
@@ -73,7 +73,7 @@ const PreferenceSection: React.FC = () => {
           <div className="flex flex-row justify-start items-center gap-x-1">
             <span className="dark:text-gray-400">{t("settings.preference.color-theme")}</span>
           </div>
-          <Select defaultValue={colorTheme} onChange={(_, value) => handleSelectColorTheme(value as UserSetting_ColorTheme)}>
+          <Select defaultValue={colorTheme} onChange={(_, value) => handleSelectColorTheme(value as string)}>
             {colorThemeOptions.map((option) => {
               return (
                 <Option key={option.value} value={option.value}>
@@ -88,7 +88,7 @@ const PreferenceSection: React.FC = () => {
             <span className="dark:text-gray-400">{t("common.language")}</span>
             <BetaBadge />
           </div>
-          <Select defaultValue={language} onChange={(_, value) => handleSelectLanguage(value as UserSetting_Locale)}>
+          <Select defaultValue={language} onChange={(_, value) => handleSelectLanguage(value as string)}>
             {languageOptions.map((option) => {
               return (
                 <Option key={option.value} value={option.value}>
diff --git a/frontend/web/src/layouts/Root.tsx b/frontend/web/src/layouts/Root.tsx
index e1fa33b..b2e9fc2 100644
--- a/frontend/web/src/layouts/Root.tsx
+++ b/frontend/web/src/layouts/Root.tsx
@@ -7,7 +7,6 @@ import Header from "@/components/Header";
 import Navigator from "@/components/Navigator";
 import useNavigateTo from "@/hooks/useNavigateTo";
 import { useUserStore } from "@/stores";
-import { UserSetting_ColorTheme, UserSetting_Locale } from "@/types/proto/api/v1/user_setting_service";
 
 const Root: React.FC = () => {
   const navigateTo = useNavigateTo();
@@ -35,19 +34,19 @@ const Root: React.FC = () => {
       return;
     }
 
-    if (isEqual(currentUserSetting.locale, UserSetting_Locale.LOCALE_ZH)) {
+    if (isEqual(currentUserSetting.locale, "ZH")) {
       i18n.changeLanguage("zh");
-    } else if (isEqual(currentUserSetting.locale, UserSetting_Locale.LOCALE_FR)) {
+    } else if (isEqual(currentUserSetting.locale, "FR")) {
       i18n.changeLanguage("fr");
-    } else if (isEqual(currentUserSetting.locale, UserSetting_Locale.LOCALE_JA)) {
+    } else if (isEqual(currentUserSetting.locale, "JA")) {
       i18n.changeLanguage("ja");
     } else {
       i18n.changeLanguage("en");
     }
 
-    if (currentUserSetting.colorTheme === UserSetting_ColorTheme.COLOR_THEME_LIGHT) {
+    if (currentUserSetting.colorTheme === "LIGHT") {
       setMode("light");
-    } else if (currentUserSetting.colorTheme === UserSetting_ColorTheme.COLOR_THEME_DARK) {
+    } else if (currentUserSetting.colorTheme === "DARK") {
       setMode("dark");
     } else {
       setMode("system");
diff --git a/proto/api/v1/user_setting_service.proto b/proto/api/v1/user_setting_service.proto
index 8dc1807..34b31a9 100644
--- a/proto/api/v1/user_setting_service.proto
+++ b/proto/api/v1/user_setting_service.proto
@@ -28,24 +28,11 @@ message UserSetting {
   // id is the user id.
   int32 id = 1;
 
-  enum Locale {
-    LOCALE_UNSPECIFIED = 0;
-    LOCALE_EN = 1;
-    LOCALE_ZH = 2;
-    LOCALE_FR = 3;
-    LOCALE_JA = 4;
-  }
   // locale is the user locale.
-  Locale locale = 2;
+  string locale = 2;
 
-  enum ColorTheme {
-    COLOR_THEME_UNSPECIFIED = 0;
-    COLOR_THEME_SYSTEM = 1;
-    COLOR_THEME_LIGHT = 2;
-    COLOR_THEME_DARK = 3;
-  }
   // color_theme is the user color theme.
-  ColorTheme color_theme = 3;
+  string color_theme = 3;
 }
 
 message GetUserSettingRequest {
diff --git a/proto/gen/api/v1/README.md b/proto/gen/api/v1/README.md
index 0cd40ad..2d1d58e 100644
--- a/proto/gen/api/v1/README.md
+++ b/proto/gen/api/v1/README.md
@@ -99,9 +99,6 @@
     - [UpdateUserSettingResponse](#slash-api-v1-UpdateUserSettingResponse)
     - [UserSetting](#slash-api-v1-UserSetting)
   
-    - [UserSetting.ColorTheme](#slash-api-v1-UserSetting-ColorTheme)
-    - [UserSetting.Locale](#slash-api-v1-UserSetting-Locale)
-  
     - [UserSettingService](#slash-api-v1-UserSettingService)
   
 - [api/v1/workspace_service.proto](#api_v1_workspace_service-proto)
@@ -1326,8 +1323,8 @@
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | id | [int32](#int32) |  | id is the user id. |
-| locale | [UserSetting.Locale](#slash-api-v1-UserSetting-Locale) |  | locale is the user locale. |
-| color_theme | [UserSetting.ColorTheme](#slash-api-v1-UserSetting-ColorTheme) |  | color_theme is the user color theme. |
+| locale | [string](#string) |  | locale is the user locale. |
+| color_theme | [string](#string) |  | color_theme is the user color theme. |
 
 
 
@@ -1335,35 +1332,6 @@
 
  
 
-
-<a name="slash-api-v1-UserSetting-ColorTheme"></a>
-
-### UserSetting.ColorTheme
-
-
-| Name | Number | Description |
-| ---- | ------ | ----------- |
-| COLOR_THEME_UNSPECIFIED | 0 |  |
-| COLOR_THEME_SYSTEM | 1 |  |
-| COLOR_THEME_LIGHT | 2 |  |
-| COLOR_THEME_DARK | 3 |  |
-
-
-
-<a name="slash-api-v1-UserSetting-Locale"></a>
-
-### UserSetting.Locale
-
-
-| Name | Number | Description |
-| ---- | ------ | ----------- |
-| LOCALE_UNSPECIFIED | 0 |  |
-| LOCALE_EN | 1 |  |
-| LOCALE_ZH | 2 |  |
-| LOCALE_FR | 3 |  |
-| LOCALE_JA | 4 |  |
-
-
  
 
  
diff --git a/proto/gen/api/v1/user_setting_service.pb.go b/proto/gen/api/v1/user_setting_service.pb.go
index 76f3751..623fd10 100644
--- a/proto/gen/api/v1/user_setting_service.pb.go
+++ b/proto/gen/api/v1/user_setting_service.pb.go
@@ -22,113 +22,6 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-type UserSetting_Locale int32
-
-const (
-	UserSetting_LOCALE_UNSPECIFIED UserSetting_Locale = 0
-	UserSetting_LOCALE_EN          UserSetting_Locale = 1
-	UserSetting_LOCALE_ZH          UserSetting_Locale = 2
-	UserSetting_LOCALE_FR          UserSetting_Locale = 3
-	UserSetting_LOCALE_JA          UserSetting_Locale = 4
-)
-
-// Enum value maps for UserSetting_Locale.
-var (
-	UserSetting_Locale_name = map[int32]string{
-		0: "LOCALE_UNSPECIFIED",
-		1: "LOCALE_EN",
-		2: "LOCALE_ZH",
-		3: "LOCALE_FR",
-		4: "LOCALE_JA",
-	}
-	UserSetting_Locale_value = map[string]int32{
-		"LOCALE_UNSPECIFIED": 0,
-		"LOCALE_EN":          1,
-		"LOCALE_ZH":          2,
-		"LOCALE_FR":          3,
-		"LOCALE_JA":          4,
-	}
-)
-
-func (x UserSetting_Locale) Enum() *UserSetting_Locale {
-	p := new(UserSetting_Locale)
-	*p = x
-	return p
-}
-
-func (x UserSetting_Locale) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (UserSetting_Locale) Descriptor() protoreflect.EnumDescriptor {
-	return file_api_v1_user_setting_service_proto_enumTypes[0].Descriptor()
-}
-
-func (UserSetting_Locale) Type() protoreflect.EnumType {
-	return &file_api_v1_user_setting_service_proto_enumTypes[0]
-}
-
-func (x UserSetting_Locale) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use UserSetting_Locale.Descriptor instead.
-func (UserSetting_Locale) EnumDescriptor() ([]byte, []int) {
-	return file_api_v1_user_setting_service_proto_rawDescGZIP(), []int{0, 0}
-}
-
-type UserSetting_ColorTheme int32
-
-const (
-	UserSetting_COLOR_THEME_UNSPECIFIED UserSetting_ColorTheme = 0
-	UserSetting_COLOR_THEME_SYSTEM      UserSetting_ColorTheme = 1
-	UserSetting_COLOR_THEME_LIGHT       UserSetting_ColorTheme = 2
-	UserSetting_COLOR_THEME_DARK        UserSetting_ColorTheme = 3
-)
-
-// Enum value maps for UserSetting_ColorTheme.
-var (
-	UserSetting_ColorTheme_name = map[int32]string{
-		0: "COLOR_THEME_UNSPECIFIED",
-		1: "COLOR_THEME_SYSTEM",
-		2: "COLOR_THEME_LIGHT",
-		3: "COLOR_THEME_DARK",
-	}
-	UserSetting_ColorTheme_value = map[string]int32{
-		"COLOR_THEME_UNSPECIFIED": 0,
-		"COLOR_THEME_SYSTEM":      1,
-		"COLOR_THEME_LIGHT":       2,
-		"COLOR_THEME_DARK":        3,
-	}
-)
-
-func (x UserSetting_ColorTheme) Enum() *UserSetting_ColorTheme {
-	p := new(UserSetting_ColorTheme)
-	*p = x
-	return p
-}
-
-func (x UserSetting_ColorTheme) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (UserSetting_ColorTheme) Descriptor() protoreflect.EnumDescriptor {
-	return file_api_v1_user_setting_service_proto_enumTypes[1].Descriptor()
-}
-
-func (UserSetting_ColorTheme) Type() protoreflect.EnumType {
-	return &file_api_v1_user_setting_service_proto_enumTypes[1]
-}
-
-func (x UserSetting_ColorTheme) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use UserSetting_ColorTheme.Descriptor instead.
-func (UserSetting_ColorTheme) EnumDescriptor() ([]byte, []int) {
-	return file_api_v1_user_setting_service_proto_rawDescGZIP(), []int{0, 1}
-}
-
 type UserSetting struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -137,9 +30,9 @@ type UserSetting struct {
 	// id is the user id.
 	Id int32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 	// locale is the user locale.
-	Locale UserSetting_Locale `protobuf:"varint,2,opt,name=locale,proto3,enum=slash.api.v1.UserSetting_Locale" json:"locale,omitempty"`
+	Locale string `protobuf:"bytes,2,opt,name=locale,proto3" json:"locale,omitempty"`
 	// color_theme is the user color theme.
-	ColorTheme UserSetting_ColorTheme `protobuf:"varint,3,opt,name=color_theme,json=colorTheme,proto3,enum=slash.api.v1.UserSetting_ColorTheme" json:"color_theme,omitempty"`
+	ColorTheme string `protobuf:"bytes,3,opt,name=color_theme,json=colorTheme,proto3" json:"color_theme,omitempty"`
 }
 
 func (x *UserSetting) Reset() {
@@ -181,18 +74,18 @@ func (x *UserSetting) GetId() int32 {
 	return 0
 }
 
-func (x *UserSetting) GetLocale() UserSetting_Locale {
+func (x *UserSetting) GetLocale() string {
 	if x != nil {
 		return x.Locale
 	}
-	return UserSetting_LOCALE_UNSPECIFIED
+	return ""
 }
 
-func (x *UserSetting) GetColorTheme() UserSetting_ColorTheme {
+func (x *UserSetting) GetColorTheme() string {
 	if x != nil {
 		return x.ColorTheme
 	}
-	return UserSetting_COLOR_THEME_UNSPECIFIED
+	return ""
 }
 
 type GetUserSettingRequest struct {
@@ -414,88 +307,70 @@ var file_api_v1_user_setting_service_proto_rawDesc = []byte{
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 }
 
 var (
@@ -510,34 +385,29 @@ func file_api_v1_user_setting_service_proto_rawDescGZIP() []byte {
 	return file_api_v1_user_setting_service_proto_rawDescData
 }
 
-var file_api_v1_user_setting_service_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_api_v1_user_setting_service_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_api_v1_user_setting_service_proto_goTypes = []any{
-	(UserSetting_Locale)(0),           // 0: slash.api.v1.UserSetting.Locale
-	(UserSetting_ColorTheme)(0),       // 1: slash.api.v1.UserSetting.ColorTheme
-	(*UserSetting)(nil),               // 2: slash.api.v1.UserSetting
-	(*GetUserSettingRequest)(nil),     // 3: slash.api.v1.GetUserSettingRequest
-	(*GetUserSettingResponse)(nil),    // 4: slash.api.v1.GetUserSettingResponse
-	(*UpdateUserSettingRequest)(nil),  // 5: slash.api.v1.UpdateUserSettingRequest
-	(*UpdateUserSettingResponse)(nil), // 6: slash.api.v1.UpdateUserSettingResponse
-	(*fieldmaskpb.FieldMask)(nil),     // 7: google.protobuf.FieldMask
+	(*UserSetting)(nil),               // 0: slash.api.v1.UserSetting
+	(*GetUserSettingRequest)(nil),     // 1: slash.api.v1.GetUserSettingRequest
+	(*GetUserSettingResponse)(nil),    // 2: slash.api.v1.GetUserSettingResponse
+	(*UpdateUserSettingRequest)(nil),  // 3: slash.api.v1.UpdateUserSettingRequest
+	(*UpdateUserSettingResponse)(nil), // 4: slash.api.v1.UpdateUserSettingResponse
+	(*fieldmaskpb.FieldMask)(nil),     // 5: google.protobuf.FieldMask
 }
 var file_api_v1_user_setting_service_proto_depIdxs = []int32{
-	0, // 0: slash.api.v1.UserSetting.locale:type_name -> slash.api.v1.UserSetting.Locale
-	1, // 1: slash.api.v1.UserSetting.color_theme:type_name -> slash.api.v1.UserSetting.ColorTheme
-	2, // 2: slash.api.v1.GetUserSettingResponse.user_setting:type_name -> slash.api.v1.UserSetting
-	2, // 3: slash.api.v1.UpdateUserSettingRequest.user_setting:type_name -> slash.api.v1.UserSetting
-	7, // 4: slash.api.v1.UpdateUserSettingRequest.update_mask:type_name -> google.protobuf.FieldMask
-	2, // 5: slash.api.v1.UpdateUserSettingResponse.user_setting:type_name -> slash.api.v1.UserSetting
-	3, // 6: slash.api.v1.UserSettingService.GetUserSetting:input_type -> slash.api.v1.GetUserSettingRequest
-	5, // 7: slash.api.v1.UserSettingService.UpdateUserSetting:input_type -> slash.api.v1.UpdateUserSettingRequest
-	4, // 8: slash.api.v1.UserSettingService.GetUserSetting:output_type -> slash.api.v1.GetUserSettingResponse
-	6, // 9: slash.api.v1.UserSettingService.UpdateUserSetting:output_type -> slash.api.v1.UpdateUserSettingResponse
-	8, // [8:10] is the sub-list for method output_type
-	6, // [6:8] is the sub-list for method input_type
-	6, // [6:6] is the sub-list for extension type_name
-	6, // [6:6] is the sub-list for extension extendee
-	0, // [0:6] is the sub-list for field type_name
+	0, // 0: slash.api.v1.GetUserSettingResponse.user_setting:type_name -> slash.api.v1.UserSetting
+	0, // 1: slash.api.v1.UpdateUserSettingRequest.user_setting:type_name -> slash.api.v1.UserSetting
+	5, // 2: slash.api.v1.UpdateUserSettingRequest.update_mask:type_name -> google.protobuf.FieldMask
+	0, // 3: slash.api.v1.UpdateUserSettingResponse.user_setting:type_name -> slash.api.v1.UserSetting
+	1, // 4: slash.api.v1.UserSettingService.GetUserSetting:input_type -> slash.api.v1.GetUserSettingRequest
+	3, // 5: slash.api.v1.UserSettingService.UpdateUserSetting:input_type -> slash.api.v1.UpdateUserSettingRequest
+	2, // 6: slash.api.v1.UserSettingService.GetUserSetting:output_type -> slash.api.v1.GetUserSettingResponse
+	4, // 7: slash.api.v1.UserSettingService.UpdateUserSetting:output_type -> slash.api.v1.UpdateUserSettingResponse
+	6, // [6:8] is the sub-list for method output_type
+	4, // [4:6] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
 }
 
 func init() { file_api_v1_user_setting_service_proto_init() }
@@ -612,14 +482,13 @@ func file_api_v1_user_setting_service_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_api_v1_user_setting_service_proto_rawDesc,
-			NumEnums:      2,
+			NumEnums:      0,
 			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
 		GoTypes:           file_api_v1_user_setting_service_proto_goTypes,
 		DependencyIndexes: file_api_v1_user_setting_service_proto_depIdxs,
-		EnumInfos:         file_api_v1_user_setting_service_proto_enumTypes,
 		MessageInfos:      file_api_v1_user_setting_service_proto_msgTypes,
 	}.Build()
 	File_api_v1_user_setting_service_proto = out.File
diff --git a/proto/gen/apidocs.swagger.yaml b/proto/gen/apidocs.swagger.yaml
index b0f6cd6..5b6e2db 100644
--- a/proto/gen/apidocs.swagger.yaml
+++ b/proto/gen/apidocs.swagger.yaml
@@ -724,23 +724,6 @@ definitions:
         description: |-
           expires_at is the expiration time of the access token.
           If expires_at is not set, the access token will never expire.
-  UserSettingColorTheme:
-    type: string
-    enum:
-      - COLOR_THEME_UNSPECIFIED
-      - COLOR_THEME_SYSTEM
-      - COLOR_THEME_LIGHT
-      - COLOR_THEME_DARK
-    default: COLOR_THEME_UNSPECIFIED
-  UserSettingLocale:
-    type: string
-    enum:
-      - LOCALE_UNSPECIFIED
-      - LOCALE_EN
-      - LOCALE_ZH
-      - LOCALE_FR
-      - LOCALE_JA
-    default: LOCALE_UNSPECIFIED
   apiv1AutoBackupWorkspaceSetting:
     type: object
     properties:
@@ -845,10 +828,10 @@ definitions:
         format: int32
         description: id is the user id.
       locale:
-        $ref: '#/definitions/UserSettingLocale'
+        type: string
         description: locale is the user locale.
       colorTheme:
-        $ref: '#/definitions/UserSettingColorTheme'
+        type: string
         description: color_theme is the user color theme.
   apiv1Visibility:
     type: string
diff --git a/proto/gen/store/README.md b/proto/gen/store/README.md
index d2c11a8..b7290d8 100644
--- a/proto/gen/store/README.md
+++ b/proto/gen/store/README.md
@@ -23,8 +23,6 @@
     - [AccessTokensUserSetting.AccessToken](#slash-store-AccessTokensUserSetting-AccessToken)
     - [UserSetting](#slash-store-UserSetting)
   
-    - [ColorThemeUserSetting](#slash-store-ColorThemeUserSetting)
-    - [LocaleUserSetting](#slash-store-LocaleUserSetting)
     - [UserSettingKey](#slash-store-UserSettingKey)
   
 - [store/workspace_setting.proto](#store_workspace_setting-proto)
@@ -276,8 +274,8 @@
 | user_id | [int32](#int32) |  |  |
 | key | [UserSettingKey](#slash-store-UserSettingKey) |  |  |
 | access_tokens | [AccessTokensUserSetting](#slash-store-AccessTokensUserSetting) |  |  |
-| locale | [LocaleUserSetting](#slash-store-LocaleUserSetting) |  |  |
-| color_theme | [ColorThemeUserSetting](#slash-store-ColorThemeUserSetting) |  |  |
+| locale | [string](#string) |  |  |
+| color_theme | [string](#string) |  |  |
 
 
 
@@ -286,35 +284,6 @@
  
 
 
-<a name="slash-store-ColorThemeUserSetting"></a>
-
-### ColorThemeUserSetting
-
-
-| Name | Number | Description |
-| ---- | ------ | ----------- |
-| COLOR_THEME_USER_SETTING_UNSPECIFIED | 0 |  |
-| SYSTEM | 1 |  |
-| LIGHT | 2 |  |
-| DARK | 3 |  |
-
-
-
-<a name="slash-store-LocaleUserSetting"></a>
-
-### LocaleUserSetting
-
-
-| Name | Number | Description |
-| ---- | ------ | ----------- |
-| LOCALE_USER_SETTING_UNSPECIFIED | 0 |  |
-| EN | 1 |  |
-| ZH | 2 |  |
-| FR | 3 |  |
-| JA | 4 |  |
-
-
-
 <a name="slash-store-UserSettingKey"></a>
 
 ### UserSettingKey
diff --git a/proto/gen/store/user_setting.pb.go b/proto/gen/store/user_setting.pb.go
index 4b6a42c..3b399e9 100644
--- a/proto/gen/store/user_setting.pb.go
+++ b/proto/gen/store/user_setting.pb.go
@@ -75,113 +75,6 @@ func (UserSettingKey) EnumDescriptor() ([]byte, []int) {
 	return file_store_user_setting_proto_rawDescGZIP(), []int{0}
 }
 
-type LocaleUserSetting int32
-
-const (
-	LocaleUserSetting_LOCALE_USER_SETTING_UNSPECIFIED LocaleUserSetting = 0
-	LocaleUserSetting_EN                              LocaleUserSetting = 1
-	LocaleUserSetting_ZH                              LocaleUserSetting = 2
-	LocaleUserSetting_FR                              LocaleUserSetting = 3
-	LocaleUserSetting_JA                              LocaleUserSetting = 4
-)
-
-// Enum value maps for LocaleUserSetting.
-var (
-	LocaleUserSetting_name = map[int32]string{
-		0: "LOCALE_USER_SETTING_UNSPECIFIED",
-		1: "EN",
-		2: "ZH",
-		3: "FR",
-		4: "JA",
-	}
-	LocaleUserSetting_value = map[string]int32{
-		"LOCALE_USER_SETTING_UNSPECIFIED": 0,
-		"EN":                              1,
-		"ZH":                              2,
-		"FR":                              3,
-		"JA":                              4,
-	}
-)
-
-func (x LocaleUserSetting) Enum() *LocaleUserSetting {
-	p := new(LocaleUserSetting)
-	*p = x
-	return p
-}
-
-func (x LocaleUserSetting) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (LocaleUserSetting) Descriptor() protoreflect.EnumDescriptor {
-	return file_store_user_setting_proto_enumTypes[1].Descriptor()
-}
-
-func (LocaleUserSetting) Type() protoreflect.EnumType {
-	return &file_store_user_setting_proto_enumTypes[1]
-}
-
-func (x LocaleUserSetting) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use LocaleUserSetting.Descriptor instead.
-func (LocaleUserSetting) EnumDescriptor() ([]byte, []int) {
-	return file_store_user_setting_proto_rawDescGZIP(), []int{1}
-}
-
-type ColorThemeUserSetting int32
-
-const (
-	ColorThemeUserSetting_COLOR_THEME_USER_SETTING_UNSPECIFIED ColorThemeUserSetting = 0
-	ColorThemeUserSetting_SYSTEM                               ColorThemeUserSetting = 1
-	ColorThemeUserSetting_LIGHT                                ColorThemeUserSetting = 2
-	ColorThemeUserSetting_DARK                                 ColorThemeUserSetting = 3
-)
-
-// Enum value maps for ColorThemeUserSetting.
-var (
-	ColorThemeUserSetting_name = map[int32]string{
-		0: "COLOR_THEME_USER_SETTING_UNSPECIFIED",
-		1: "SYSTEM",
-		2: "LIGHT",
-		3: "DARK",
-	}
-	ColorThemeUserSetting_value = map[string]int32{
-		"COLOR_THEME_USER_SETTING_UNSPECIFIED": 0,
-		"SYSTEM":                               1,
-		"LIGHT":                                2,
-		"DARK":                                 3,
-	}
-)
-
-func (x ColorThemeUserSetting) Enum() *ColorThemeUserSetting {
-	p := new(ColorThemeUserSetting)
-	*p = x
-	return p
-}
-
-func (x ColorThemeUserSetting) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (ColorThemeUserSetting) Descriptor() protoreflect.EnumDescriptor {
-	return file_store_user_setting_proto_enumTypes[2].Descriptor()
-}
-
-func (ColorThemeUserSetting) Type() protoreflect.EnumType {
-	return &file_store_user_setting_proto_enumTypes[2]
-}
-
-func (x ColorThemeUserSetting) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use ColorThemeUserSetting.Descriptor instead.
-func (ColorThemeUserSetting) EnumDescriptor() ([]byte, []int) {
-	return file_store_user_setting_proto_rawDescGZIP(), []int{2}
-}
-
 type UserSetting struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -257,18 +150,18 @@ func (x *UserSetting) GetAccessTokens() *AccessTokensUserSetting {
 	return nil
 }
 
-func (x *UserSetting) GetLocale() LocaleUserSetting {
+func (x *UserSetting) GetLocale() string {
 	if x, ok := x.GetValue().(*UserSetting_Locale); ok {
 		return x.Locale
 	}
-	return LocaleUserSetting_LOCALE_USER_SETTING_UNSPECIFIED
+	return ""
 }
 
-func (x *UserSetting) GetColorTheme() ColorThemeUserSetting {
+func (x *UserSetting) GetColorTheme() string {
 	if x, ok := x.GetValue().(*UserSetting_ColorTheme); ok {
 		return x.ColorTheme
 	}
-	return ColorThemeUserSetting_COLOR_THEME_USER_SETTING_UNSPECIFIED
+	return ""
 }
 
 type isUserSetting_Value interface {
@@ -280,11 +173,11 @@ type UserSetting_AccessTokens struct {
 }
 
 type UserSetting_Locale struct {
-	Locale LocaleUserSetting `protobuf:"varint,4,opt,name=locale,proto3,enum=slash.store.LocaleUserSetting,oneof"`
+	Locale string `protobuf:"bytes,4,opt,name=locale,proto3,oneof"`
 }
 
 type UserSetting_ColorTheme struct {
-	ColorTheme ColorThemeUserSetting `protobuf:"varint,5,opt,name=color_theme,json=colorTheme,proto3,enum=slash.store.ColorThemeUserSetting,oneof"`
+	ColorTheme string `protobuf:"bytes,5,opt,name=color_theme,json=colorTheme,proto3,oneof"`
 }
 
 func (*UserSetting_AccessTokens) isUserSetting_Value() {}
@@ -403,7 +296,7 @@ var File_store_user_setting_proto protoreflect.FileDescriptor
 var file_store_user_setting_proto_rawDesc = []byte{
 	0x0a, 0x18, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x75, 0x73, 0x65, 0x72, 0x5f, 0x73, 0x65, 0x74,
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@@ -413,57 +306,41 @@ var file_store_user_setting_proto_rawDesc = []byte{
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-	0x6c, 0x61, 0x73, 0x68, 0x5c, 0x53, 0x74, 0x6f, 0x72, 0x65, 0xe2, 0x02, 0x17, 0x53, 0x6c, 0x61,
-	0x73, 0x68, 0x5c, 0x53, 0x74, 0x6f, 0x72, 0x65, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61,
-	0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x3a, 0x3a, 0x53, 0x74,
-	0x6f, 0x72, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x73, 0x12, 0x18, 0x0a, 0x06,
+	0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x06,
+	0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x65, 0x12, 0x21, 0x0a, 0x0b, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x5f,
+	0x74, 0x68, 0x65, 0x6d, 0x65, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x0a, 0x63,
+	0x6f, 0x6c, 0x6f, 0x72, 0x54, 0x68, 0x65, 0x6d, 0x65, 0x42, 0x07, 0x0a, 0x05, 0x76, 0x61, 0x6c,
+	0x75, 0x65, 0x22, 0xc4, 0x01, 0x0a, 0x17, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x54, 0x6f, 0x6b,
+	0x65, 0x6e, 0x73, 0x55, 0x73, 0x65, 0x72, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x12, 0x55,
+	0x0a, 0x0d, 0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x5f, 0x74, 0x6f, 0x6b, 0x65, 0x6e, 0x73, 0x18,
+	0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x30, 0x2e, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x73, 0x74,
+	0x6f, 0x72, 0x65, 0x2e, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x73,
+	0x55, 0x73, 0x65, 0x72, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x41, 0x63, 0x63, 0x65,
+	0x73, 0x73, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x0c, 0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x54,
+	0x6f, 0x6b, 0x65, 0x6e, 0x73, 0x1a, 0x52, 0x0a, 0x0b, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x54,
+	0x6f, 0x6b, 0x65, 0x6e, 0x12, 0x21, 0x0a, 0x0c, 0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x5f, 0x74,
+	0x6f, 0x6b, 0x65, 0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x61, 0x63, 0x63, 0x65,
+	0x73, 0x73, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x12, 0x20, 0x0a, 0x0b, 0x64, 0x65, 0x73, 0x63, 0x72,
+	0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x64, 0x65,
+	0x73, 0x63, 0x72, 0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x2a, 0x62, 0x0a, 0x0e, 0x55, 0x73, 0x65,
+	0x72, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x4b, 0x65, 0x79, 0x12, 0x20, 0x0a, 0x1c, 0x55,
+	0x53, 0x45, 0x52, 0x5f, 0x53, 0x45, 0x54, 0x54, 0x49, 0x4e, 0x47, 0x5f, 0x4b, 0x45, 0x59, 0x5f,
+	0x55, 0x4e, 0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x11, 0x0a,
+	0x0d, 0x41, 0x43, 0x43, 0x45, 0x53, 0x53, 0x5f, 0x54, 0x4f, 0x4b, 0x45, 0x4e, 0x53, 0x10, 0x01,
+	0x12, 0x0a, 0x0a, 0x06, 0x4c, 0x4f, 0x43, 0x41, 0x4c, 0x45, 0x10, 0x02, 0x12, 0x0f, 0x0a, 0x0b,
+	0x43, 0x4f, 0x4c, 0x4f, 0x52, 0x5f, 0x54, 0x48, 0x45, 0x4d, 0x45, 0x10, 0x03, 0x42, 0xa1, 0x01,
+	0x0a, 0x0f, 0x63, 0x6f, 0x6d, 0x2e, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x73, 0x74, 0x6f, 0x72,
+	0x65, 0x42, 0x10, 0x55, 0x73, 0x65, 0x72, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x50, 0x72,
+	0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x79, 0x6f, 0x75, 0x72, 0x73, 0x65, 0x6c, 0x66, 0x68, 0x6f, 0x73, 0x74, 0x65, 0x64,
+	0x2f, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x65, 0x6e,
+	0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0xa2, 0x02, 0x03, 0x53, 0x53, 0x58, 0xaa, 0x02, 0x0b, 0x53,
+	0x6c, 0x61, 0x73, 0x68, 0x2e, 0x53, 0x74, 0x6f, 0x72, 0x65, 0xca, 0x02, 0x0b, 0x53, 0x6c, 0x61,
+	0x73, 0x68, 0x5c, 0x53, 0x74, 0x6f, 0x72, 0x65, 0xe2, 0x02, 0x17, 0x53, 0x6c, 0x61, 0x73, 0x68,
+	0x5c, 0x53, 0x74, 0x6f, 0x72, 0x65, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61,
+	0x74, 0x61, 0xea, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x3a, 0x3a, 0x53, 0x74, 0x6f, 0x72,
+	0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -478,27 +355,23 @@ func file_store_user_setting_proto_rawDescGZIP() []byte {
 	return file_store_user_setting_proto_rawDescData
 }
 
-var file_store_user_setting_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
+var file_store_user_setting_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_store_user_setting_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
 var file_store_user_setting_proto_goTypes = []any{
 	(UserSettingKey)(0),                         // 0: slash.store.UserSettingKey
-	(LocaleUserSetting)(0),                      // 1: slash.store.LocaleUserSetting
-	(ColorThemeUserSetting)(0),                  // 2: slash.store.ColorThemeUserSetting
-	(*UserSetting)(nil),                         // 3: slash.store.UserSetting
-	(*AccessTokensUserSetting)(nil),             // 4: slash.store.AccessTokensUserSetting
-	(*AccessTokensUserSetting_AccessToken)(nil), // 5: slash.store.AccessTokensUserSetting.AccessToken
+	(*UserSetting)(nil),                         // 1: slash.store.UserSetting
+	(*AccessTokensUserSetting)(nil),             // 2: slash.store.AccessTokensUserSetting
+	(*AccessTokensUserSetting_AccessToken)(nil), // 3: slash.store.AccessTokensUserSetting.AccessToken
 }
 var file_store_user_setting_proto_depIdxs = []int32{
 	0, // 0: slash.store.UserSetting.key:type_name -> slash.store.UserSettingKey
-	4, // 1: slash.store.UserSetting.access_tokens:type_name -> slash.store.AccessTokensUserSetting
-	1, // 2: slash.store.UserSetting.locale:type_name -> slash.store.LocaleUserSetting
-	2, // 3: slash.store.UserSetting.color_theme:type_name -> slash.store.ColorThemeUserSetting
-	5, // 4: slash.store.AccessTokensUserSetting.access_tokens:type_name -> slash.store.AccessTokensUserSetting.AccessToken
-	5, // [5:5] is the sub-list for method output_type
-	5, // [5:5] is the sub-list for method input_type
-	5, // [5:5] is the sub-list for extension type_name
-	5, // [5:5] is the sub-list for extension extendee
-	0, // [0:5] is the sub-list for field type_name
+	2, // 1: slash.store.UserSetting.access_tokens:type_name -> slash.store.AccessTokensUserSetting
+	3, // 2: slash.store.AccessTokensUserSetting.access_tokens:type_name -> slash.store.AccessTokensUserSetting.AccessToken
+	3, // [3:3] is the sub-list for method output_type
+	3, // [3:3] is the sub-list for method input_type
+	3, // [3:3] is the sub-list for extension type_name
+	3, // [3:3] is the sub-list for extension extendee
+	0, // [0:3] is the sub-list for field type_name
 }
 
 func init() { file_store_user_setting_proto_init() }
@@ -554,7 +427,7 @@ func file_store_user_setting_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_store_user_setting_proto_rawDesc,
-			NumEnums:      3,
+			NumEnums:      1,
 			NumMessages:   3,
 			NumExtensions: 0,
 			NumServices:   0,
diff --git a/proto/store/user_setting.proto b/proto/store/user_setting.proto
index 5a364a5..bcd17d5 100644
--- a/proto/store/user_setting.proto
+++ b/proto/store/user_setting.proto
@@ -12,9 +12,9 @@ message UserSetting {
   oneof value {
     AccessTokensUserSetting access_tokens = 3;
 
-    LocaleUserSetting locale = 4;
+    string locale = 4;
 
-    ColorThemeUserSetting color_theme = 5;
+    string color_theme = 5;
   }
 }
 
@@ -38,18 +38,3 @@ message AccessTokensUserSetting {
   }
   repeated AccessToken access_tokens = 1;
 }
-
-enum LocaleUserSetting {
-  LOCALE_USER_SETTING_UNSPECIFIED = 0;
-  EN = 1;
-  ZH = 2;
-  FR = 3;
-  JA = 4;
-}
-
-enum ColorThemeUserSetting {
-  COLOR_THEME_USER_SETTING_UNSPECIFIED = 0;
-  SYSTEM = 1;
-  LIGHT = 2;
-  DARK = 3;
-}
diff --git a/server/route/api/v1/user_setting_service.go b/server/route/api/v1/user_setting_service.go
index 67f69f6..1acacea 100644
--- a/server/route/api/v1/user_setting_service.go
+++ b/server/route/api/v1/user_setting_service.go
@@ -37,7 +37,7 @@ func (s *APIV1Service) UpdateUserSetting(ctx context.Context, request *v1pb.Upda
 				UserId: user.ID,
 				Key:    storepb.UserSettingKey_LOCALE,
 				Value: &storepb.UserSetting_Locale{
-					Locale: convertUserSettingLocaleToStore(request.UserSetting.Locale),
+					Locale: request.UserSetting.Locale,
 				},
 			}); err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to update user setting: %v", err)
@@ -47,7 +47,7 @@ func (s *APIV1Service) UpdateUserSetting(ctx context.Context, request *v1pb.Upda
 				UserId: user.ID,
 				Key:    storepb.UserSettingKey_COLOR_THEME,
 				Value: &storepb.UserSetting_ColorTheme{
-					ColorTheme: convertUserSettingColorThemeToStore(request.UserSetting.ColorTheme),
+					ColorTheme: request.UserSetting.ColorTheme,
 				},
 			}); err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to update user setting: %v", err)
@@ -76,71 +76,15 @@ func getUserSetting(ctx context.Context, s *store.Store, userID int32) (*v1pb.Us
 
 	userSetting := &v1pb.UserSetting{
 		Id:         userID,
-		Locale:     v1pb.UserSetting_LOCALE_EN,
-		ColorTheme: v1pb.UserSetting_COLOR_THEME_SYSTEM,
+		Locale:     "EN",
+		ColorTheme: "SYSTEM",
 	}
 	for _, setting := range userSettings {
 		if setting.Key == storepb.UserSettingKey_LOCALE {
-			userSetting.Locale = convertUserSettingLocaleFromStore(setting.GetLocale())
+			userSetting.Locale = setting.GetLocale()
 		} else if setting.Key == storepb.UserSettingKey_COLOR_THEME {
-			userSetting.ColorTheme = convertUserSettingColorThemeFromStore(setting.GetColorTheme())
+			userSetting.ColorTheme = setting.GetColorTheme()
 		}
 	}
 	return userSetting, nil
 }
-
-func convertUserSettingLocaleToStore(locale v1pb.UserSetting_Locale) storepb.LocaleUserSetting {
-	switch locale {
-	case v1pb.UserSetting_LOCALE_EN:
-		return storepb.LocaleUserSetting_EN
-	case v1pb.UserSetting_LOCALE_ZH:
-		return storepb.LocaleUserSetting_ZH
-	case v1pb.UserSetting_LOCALE_FR:
-		return storepb.LocaleUserSetting_FR
-	case v1pb.UserSetting_LOCALE_JA:
-		return storepb.LocaleUserSetting_JA
-	default:
-		return storepb.LocaleUserSetting_LOCALE_USER_SETTING_UNSPECIFIED
-	}
-}
-
-func convertUserSettingLocaleFromStore(locale storepb.LocaleUserSetting) v1pb.UserSetting_Locale {
-	switch locale {
-	case storepb.LocaleUserSetting_EN:
-		return v1pb.UserSetting_LOCALE_EN
-	case storepb.LocaleUserSetting_ZH:
-		return v1pb.UserSetting_LOCALE_ZH
-	case storepb.LocaleUserSetting_FR:
-		return v1pb.UserSetting_LOCALE_FR
-	case storepb.LocaleUserSetting_JA:
-		return v1pb.UserSetting_LOCALE_JA
-	default:
-		return v1pb.UserSetting_LOCALE_UNSPECIFIED
-	}
-}
-
-func convertUserSettingColorThemeToStore(colorTheme v1pb.UserSetting_ColorTheme) storepb.ColorThemeUserSetting {
-	switch colorTheme {
-	case v1pb.UserSetting_COLOR_THEME_SYSTEM:
-		return storepb.ColorThemeUserSetting_SYSTEM
-	case v1pb.UserSetting_COLOR_THEME_LIGHT:
-		return storepb.ColorThemeUserSetting_LIGHT
-	case v1pb.UserSetting_COLOR_THEME_DARK:
-		return storepb.ColorThemeUserSetting_DARK
-	default:
-		return storepb.ColorThemeUserSetting_COLOR_THEME_USER_SETTING_UNSPECIFIED
-	}
-}
-
-func convertUserSettingColorThemeFromStore(colorTheme storepb.ColorThemeUserSetting) v1pb.UserSetting_ColorTheme {
-	switch colorTheme {
-	case storepb.ColorThemeUserSetting_SYSTEM:
-		return v1pb.UserSetting_COLOR_THEME_SYSTEM
-	case storepb.ColorThemeUserSetting_LIGHT:
-		return v1pb.UserSetting_COLOR_THEME_LIGHT
-	case storepb.ColorThemeUserSetting_DARK:
-		return v1pb.UserSetting_COLOR_THEME_DARK
-	default:
-		return v1pb.UserSetting_COLOR_THEME_UNSPECIFIED
-	}
-}
diff --git a/store/db/postgres/user_setting.go b/store/db/postgres/user_setting.go
index 39ca6dd..c42cc8e 100644
--- a/store/db/postgres/user_setting.go
+++ b/store/db/postgres/user_setting.go
@@ -30,9 +30,9 @@ func (d *DB) UpsertUserSetting(ctx context.Context, upsert *storepb.UserSetting)
 		}
 		valueString = string(valueBytes)
 	} else if upsert.Key == storepb.UserSettingKey_LOCALE {
-		valueString = upsert.GetLocale().String()
+		valueString = upsert.GetLocale()
 	} else if upsert.Key == storepb.UserSettingKey_COLOR_THEME {
-		valueString = upsert.GetColorTheme().String()
+		valueString = upsert.GetColorTheme()
 	} else {
 		return nil, errors.New("invalid user setting key")
 	}
@@ -90,11 +90,11 @@ func (d *DB) ListUserSettings(ctx context.Context, find *store.FindUserSetting)
 			}
 		} else if userSetting.Key == storepb.UserSettingKey_LOCALE {
 			userSetting.Value = &storepb.UserSetting_Locale{
-				Locale: storepb.LocaleUserSetting(storepb.LocaleUserSetting_value[valueString]),
+				Locale: valueString,
 			}
 		} else if userSetting.Key == storepb.UserSettingKey_COLOR_THEME {
 			userSetting.Value = &storepb.UserSetting_ColorTheme{
-				ColorTheme: storepb.ColorThemeUserSetting(storepb.ColorThemeUserSetting_value[valueString]),
+				ColorTheme: valueString,
 			}
 		} else {
 			// Skip unknown key.
diff --git a/store/db/sqlite/user_setting.go b/store/db/sqlite/user_setting.go
index 6136d8c..712ea08 100644
--- a/store/db/sqlite/user_setting.go
+++ b/store/db/sqlite/user_setting.go
@@ -29,9 +29,9 @@ func (d *DB) UpsertUserSetting(ctx context.Context, upsert *storepb.UserSetting)
 		}
 		valueString = string(valueBytes)
 	} else if upsert.Key == storepb.UserSettingKey_LOCALE {
-		valueString = upsert.GetLocale().String()
+		valueString = upsert.GetLocale()
 	} else if upsert.Key == storepb.UserSettingKey_COLOR_THEME {
-		valueString = upsert.GetColorTheme().String()
+		valueString = upsert.GetColorTheme()
 	} else {
 		return nil, errors.New("invalid user setting key")
 	}
@@ -89,11 +89,11 @@ func (d *DB) ListUserSettings(ctx context.Context, find *store.FindUserSetting)
 			}
 		} else if userSetting.Key == storepb.UserSettingKey_LOCALE {
 			userSetting.Value = &storepb.UserSetting_Locale{
-				Locale: storepb.LocaleUserSetting(storepb.LocaleUserSetting_value[valueString]),
+				Locale: valueString,
 			}
 		} else if userSetting.Key == storepb.UserSettingKey_COLOR_THEME {
 			userSetting.Value = &storepb.UserSetting_ColorTheme{
-				ColorTheme: storepb.ColorThemeUserSetting(storepb.ColorThemeUserSetting_value[valueString]),
+				ColorTheme: valueString,
 			}
 		} else {
 			// Skip unknown key.
diff --git a/test/store/user_setting_test.go b/test/store/user_setting_test.go
index 1a2eee0..e248acc 100644
--- a/test/store/user_setting_test.go
+++ b/test/store/user_setting_test.go
@@ -79,42 +79,42 @@ func TestUserSettingStore(t *testing.T) {
 		UserId: user.ID,
 		Key:    storepb.UserSettingKey_LOCALE,
 		Value: &storepb.UserSetting_Locale{
-			Locale: storepb.LocaleUserSetting_ZH,
+			Locale: "ZH",
 		},
 	})
 	require.NoError(t, err)
 	require.NotNil(t, localeUserSetting)
 	require.Equal(t, storepb.UserSettingKey_LOCALE, localeUserSetting.Key)
-	require.Equal(t, storepb.LocaleUserSetting_ZH, localeUserSetting.GetLocale())
+	require.Equal(t, "ZH", localeUserSetting.GetLocale())
 	localeUserSetting, err = ts.UpsertUserSetting(ctx, &storepb.UserSetting{
 		UserId: user.ID,
 		Key:    storepb.UserSettingKey_LOCALE,
 		Value: &storepb.UserSetting_Locale{
-			Locale: storepb.LocaleUserSetting_EN,
+			Locale: "EN",
 		},
 	})
 	require.NoError(t, err)
-	require.Equal(t, storepb.LocaleUserSetting_EN, localeUserSetting.GetLocale())
+	require.Equal(t, "EN", localeUserSetting.GetLocale())
 
 	// Test for color theme user setting.
 	colorThemeUserSetting, err := ts.UpsertUserSetting(ctx, &storepb.UserSetting{
 		UserId: user.ID,
 		Key:    storepb.UserSettingKey_COLOR_THEME,
 		Value: &storepb.UserSetting_ColorTheme{
-			ColorTheme: storepb.ColorThemeUserSetting_LIGHT,
+			ColorTheme: "LIGHT",
 		},
 	})
 	require.NoError(t, err)
 	require.NotNil(t, colorThemeUserSetting)
 	require.Equal(t, storepb.UserSettingKey_COLOR_THEME, colorThemeUserSetting.Key)
-	require.Equal(t, storepb.ColorThemeUserSetting_LIGHT, colorThemeUserSetting.GetColorTheme())
+	require.Equal(t, "LIGHT", colorThemeUserSetting.GetColorTheme())
 	colorThemeUserSetting, err = ts.UpsertUserSetting(ctx, &storepb.UserSetting{
 		UserId: user.ID,
 		Key:    storepb.UserSettingKey_COLOR_THEME,
 		Value: &storepb.UserSetting_ColorTheme{
-			ColorTheme: storepb.ColorThemeUserSetting_DARK,
+			ColorTheme: "DARK",
 		},
 	})
 	require.NoError(t, err)
-	require.Equal(t, storepb.ColorThemeUserSetting_DARK, colorThemeUserSetting.GetColorTheme())
+	require.Equal(t, "DARK", colorThemeUserSetting.GetColorTheme())
 }