diff --git a/packages/hydrooj/locales/en.yaml b/packages/hydrooj/locales/en.yaml
index b28e8eed5..7b5d4bde8 100644
--- a/packages/hydrooj/locales/en.yaml
+++ b/packages/hydrooj/locales/en.yaml
@@ -1,3 +1,4 @@
+__id: en
 __langname: English
 Can be Extended For: Extension
 contest_create: Contest Create
diff --git a/packages/hydrooj/locales/ko.yaml b/packages/hydrooj/locales/ko.yaml
index b8a26bf22..2c6c55ec4 100644
--- a/packages/hydrooj/locales/ko.yaml
+++ b/packages/hydrooj/locales/ko.yaml
@@ -1,3 +1,4 @@
+__id: ko
 __langname: 한국어
 '"{data}" copied to clipboard!': “{data}”복사 완료
 '{} is a moderator of this domain.': '{}가 그룹의 관리자입니다.'
diff --git a/packages/hydrooj/locales/zh.yaml b/packages/hydrooj/locales/zh.yaml
index 0ddccd525..7646b2f71 100644
--- a/packages/hydrooj/locales/zh.yaml
+++ b/packages/hydrooj/locales/zh.yaml
@@ -1,3 +1,4 @@
+__id: zh
 __langname: 简体中文
 '"{data}" copied to clipboard!': “{data}”已复制到剪贴板！
 '{} is a moderator of this domain.': '{}是这个域的管理者之一。'
diff --git a/packages/hydrooj/locales/zh_TW.yaml b/packages/hydrooj/locales/zh_TW.yaml
index 3902ec0e6..0dce065fb 100644
--- a/packages/hydrooj/locales/zh_TW.yaml
+++ b/packages/hydrooj/locales/zh_TW.yaml
@@ -1,3 +1,4 @@
+__id: zh_TW
 __langname: 正體中文
 '{0} comments': '{0} 條評論'
 '{0} discussions': '{0} 條討論'
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index f97ca5b05..3dc876eb9 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.15.17",
+    "version": "2.15.18",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/entry/master.ts b/packages/hydrooj/src/entry/master.ts
index cec349439..0afb9a8d8 100644
--- a/packages/hydrooj/src/entry/master.ts
+++ b/packages/hydrooj/src/entry/master.ts
@@ -69,9 +69,14 @@ export async function load(call: Entry) {
     for (const i of builtinModel) require(`../model/${i}`);
     const scripts = require('../upgrade');
     let dbVer = (await modelSystem.get('db.ver')) ?? 0;
+    const isFresh = !dbVer;
     const expected = scripts.length;
     while (dbVer < expected) {
         logger.info('Upgrading database: from %d to %d', dbVer, expected);
+        if (isFresh) {
+            const func = scripts[dbVer].toString();
+            if (func.includes('_FRESH_INSTALL_IGNORE')) continue;
+        }
         const result = await scripts[dbVer]();
         if (!result) break;
         dbVer++;
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 1c182f225..9e7c910ab 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -329,6 +329,7 @@ export interface DomainDoc extends Dictionary<any> {
     bulletin: string,
     pidCounter: number,
     join?: any,
+    hostname?: string,
 }
 
 // Message
diff --git a/packages/hydrooj/src/lib/i18n.ts b/packages/hydrooj/src/lib/i18n.ts
index 40558fa3b..e0053137d 100644
--- a/packages/hydrooj/src/lib/i18n.ts
+++ b/packages/hydrooj/src/lib/i18n.ts
@@ -46,12 +46,8 @@ String.prototype.translate = function translate(...languages: string[]) {
     languages.push(global.Hydro.model.system.get('server.language'));
     for (const language of languages) {
         if (!language) continue;
-        if (locales[language]) {
-            if (locales[language][this] !== undefined) return locales[language][this];
-        }
-        if (locales[language.split('_')[0]]) {
-            if (locales[language.split('_')[0]][this] !== undefined) return locales[language.split('_')[0]][this];
-        }
+        const curr = (locales[language] || {})[this] || (locales[language.split('_')[0]] || {})[this];
+        if (curr) return curr;
     }
     return this;
 };
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index ba4adab03..703c37e80 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -137,6 +137,14 @@ export function count(domainId: string, query: FilterQuery<Pdoc>) {
     return document.count(domainId, document.TYPE_PROBLEM, query);
 }
 
+export function del(domainId: string, docId: number) {
+    return Promise.all([
+        document.deleteOne(domainId, document.TYPE_PROBLEM, docId),
+        document.deleteMultiStatus(domainId, document.TYPE_PROBLEM, { docId }),
+        bus.parallel('problem/delete', domainId, docId),
+    ]);
+}
+
 export async function addTestdata(domainId: string, pid: number, name: string, f: Readable | Buffer | string) {
     await storage.put(`problem/${domainId}/${pid}/testdata/${name}`, f);
     const meta = await storage.getMeta(`problem/${domainId}/${pid}/testdata/${name}`);
@@ -208,11 +216,6 @@ export function setStar(domainId: string, pid: number, uid: number, star: boolea
     return document.setStatus(domainId, document.TYPE_PROBLEM, pid, uid, { star });
 }
 
-bus.on('problem/delete', (domainId, docId) => Promise.all([
-    document.deleteOne(domainId, document.TYPE_PROBLEM, docId),
-    document.deleteMultiStatus(domainId, document.TYPE_PROBLEM, { docId }),
-]));
-
 global.Hydro.model.problem = {
     Pdoc,
 
@@ -227,6 +230,7 @@ global.Hydro.model.problem = {
     add,
     inc,
     get,
+    del,
     edit,
     count,
     push,
diff --git a/packages/hydrooj/src/service/server.ts b/packages/hydrooj/src/service/server.ts
index ce8069393..7b3234a90 100644
--- a/packages/hydrooj/src/service/server.ts
+++ b/packages/hydrooj/src/service/server.ts
@@ -194,69 +194,17 @@ function _descriptor(v: ParamOption) {
     };
 }
 
-export function get(
-    name: string, type: Type, validate: null, convert: Converter
-): MethodDecorator;
-export function get(
-    name: string, type: Type, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function get(
-    name: string, type?: Type, isOptional?: boolean, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function get(
-    name: string, ...args: Array<Type | boolean | Validator | Converter>
-): MethodDecorator;
-export function get(name: string, ...args: any): MethodDecorator {
-    return _descriptor(_buildParam(name, 'get', ...args));
-}
+type DescriptorBuilder =
+    ((name: string, type: Type) => MethodDecorator)
+    & ((name: string, type: Type, validate: null, convert: Converter) => MethodDecorator)
+    & ((name: string, type: Type, validate?: Validator, convert?: Converter) => MethodDecorator)
+    & ((name: string, type?: Type, isOptional?: boolean, validate?: Validator, convert?: Converter) => MethodDecorator)
+    & ((name: string, ...args: Array<Type | boolean | Validator | Converter>) => MethodDecorator)
 
-export function post(
-    name: string, type: Type, validate: null, convert: Converter
-): MethodDecorator;
-export function post(
-    name: string, type?: Type, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function post(
-    name: string, type?: Type, isOptional?: boolean, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function post(
-    name: string, ...args: Array<Type | boolean | Converter | Validator>
-): MethodDecorator;
-export function post(name: string, ...args: any): MethodDecorator {
-    return _descriptor(_buildParam(name, 'post', ...args));
-}
-
-export function route(
-    name: string, type: Type, validate: null, convert: Converter
-): MethodDecorator;
-export function route(
-    name: string, type?: Type, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function route(
-    name: string, type?: Type, isOptional?: boolean, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function route(
-    name: string, ...args: Array<Type | boolean | Converter | Validator>
-): MethodDecorator;
-export function route(name: string, ...args: any): MethodDecorator {
-    return _descriptor(_buildParam(name, 'route', ...args));
-}
-
-export function param(
-    name: string, type: Type, validate: null, convert: Converter
-): MethodDecorator;
-export function param(
-    name: string, type?: Type, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function param(
-    name: string, type?: Type, isOptional?: boolean, validate?: Validator, convert?: Converter,
-): MethodDecorator;
-export function param(
-    name: string, ...args: Array<Type | boolean | Converter | Validator>
-): MethodDecorator;
-export function param(name: string, ...args: any): MethodDecorator {
-    return _descriptor(_buildParam(name, 'all', ...args));
-}
+export const get: DescriptorBuilder = (name, ...args) => _descriptor(_buildParam(name, 'get', ...args));
+export const post: DescriptorBuilder = (name, ...args) => _descriptor(_buildParam(name, 'post', ...args));
+export const route: DescriptorBuilder = (name, ...args) => _descriptor(_buildParam(name, 'route', ...args));
+export const param: DescriptorBuilder = (name, ...args) => _descriptor(_buildParam(name, 'all', ...args));
 
 export function requireCsrfToken(target: any, funcName: string, obj: any) {
     const originalMethod = obj.value;
@@ -323,6 +271,24 @@ export class HandlerCommon {
         if (!this.user.hasPriv(...args)) throw new PrivilegeError(...args);
     }
 
+    async renderHTML(name: string, context: any): Promise<string> {
+        const UserContext: any = {
+            ...this.user,
+            gravatar: misc.gravatar(this.user.gravatar || '', 128),
+            perm: this.user.perm.toString(),
+        };
+        UserContext.viewLang = this.translate('__id');
+        if (!global.Hydro.lib.template) return JSON.stringify(context);
+        const res = await global.Hydro.lib.template.render(name, {
+            handler: this,
+            UserContext,
+            url: this.url.bind(this),
+            _: this.translate.bind(this),
+            ...context,
+        });
+        return res;
+    }
+
     url(name: string, kwargs: any = {}) {
         let res = '#';
         const args: any = {};
@@ -395,9 +361,7 @@ export class Handler extends HandlerCommon {
             ip: ctx.request.ip,
             headers: ctx.request.headers,
             cookies: ctx.cookies,
-            // @ts-ignore
             body: ctx.request.body,
-            // @ts-ignore
             files: ctx.request.files,
             query: ctx.query,
             path: ctx.path,
@@ -428,6 +392,8 @@ export class Handler extends HandlerCommon {
             url_prefix: '/',
         };
         this.session = {};
+        const xff = system.get('server.xff');
+        if (xff) this.request.ip = this.request.headers[xff.toLowerCase()] || this.request.ip;
     }
 
     @lrucache
@@ -436,23 +402,6 @@ export class Handler extends HandlerCommon {
         return hash('csrf_token', id);
     }
 
-    async renderHTML(name: string, context: any): Promise<string> {
-        const UserContext = {
-            ...this.user,
-            gravatar: misc.gravatar(this.user.gravatar || '', 128),
-            perm: this.user.perm.toString(),
-        };
-        if (!global.Hydro.lib.template) return JSON.stringify(context);
-        const res = await global.Hydro.lib.template.render(name, {
-            handler: this,
-            UserContext,
-            url: this.url.bind(this),
-            _: this.translate.bind(this),
-            ...context,
-        });
-        return res;
-    }
-
     async render(name: string, context: any) {
         this.response.body = await this.renderHTML(name, context);
         this.response.type = 'text/html';
@@ -482,10 +431,9 @@ export class Handler extends HandlerCommon {
     }
 
     async init({ domainId }) {
-        const xff = system.get('server.xff') as string;
-        if (xff) this.request.ip = this.request.headers[xff.toLowerCase()];
         [this.domain] = await Promise.all([
             domain.get(domainId),
+            this.limitRate('global', 10, 100),
             this.getSession(),
             this.getBdoc(),
         ]);
@@ -733,15 +681,6 @@ export class ConnectionHandler extends HandlerCommon {
         for (const i in p) this.request.params[p[i][0]] = decodeURIComponent(p[i][1]);
     }
 
-    async renderHTML(name: string, context: any): Promise<string> {
-        const res = await global.Hydro.lib.template.render(name, Object.assign(context, {
-            handler: this,
-            url: this.url.bind(this),
-            _: this.translate.bind(this),
-        }));
-        return res;
-    }
-
     send(data: any) {
         this.conn.write(JSON.stringify(data));
     }
@@ -782,10 +721,13 @@ export class ConnectionHandler extends HandlerCommon {
             domain.get(domainId),
             this.getSession(cookie),
         ]);
-        const bdoc = await blacklist.get(this.request.ip);
+        const [bdoc, udoc] = await Promise.all([
+            blacklist.get(this.request.ip),
+            user.getById(domainId, this.session.uid, this.session.scope),
+        ]);
         if (bdoc) throw new BlacklistedError(this.request.ip);
-        this.user = await user.getById(domainId, this.session.uid, this.session.scope);
-        if (!this.user) throw new UserNotFoundError(this.session.uid);
+        if (!udoc) throw new UserNotFoundError(this.session.uid);
+        this.user = udoc;
         if (this.user._id === 0 && this.session.viewLang) this.user.viewLang = this.session.viewLang;
     }
 }
@@ -844,17 +786,6 @@ export function start() {
             logger.debug(`${ctx.request.method} ${ctx.request.path} ${ctx.response.status} ${endTime - startTime}ms ${ctx.response.length}`);
         });
     }
-    app.use(async (ctx, next) => {
-        const xff = system.get('server.xff');
-        const ip = xff ? ctx.request.headers[xff] : ctx.request.ip;
-        try {
-            await opcount.inc('global', ip, 10, 100);
-        } catch (e) {
-            ctx.status = 429;
-            return null;
-        }
-        return await next();
-    });
     app.use(router.routes()).use(router.allowedMethods());
     server.listen(argv.port || port);
     logger.success('Server listening at: %d', argv.port || port);
diff --git a/packages/hydrooj/src/ui.ts b/packages/hydrooj/src/ui.ts
index 1e92f7adb..93d15e3a4 100644
--- a/packages/hydrooj/src/ui.ts
+++ b/packages/hydrooj/src/ui.ts
@@ -13,7 +13,7 @@ declare module 'terminal-kit/Terminal' {
     }
 }
 
-const useTerminal = cluster.isMaster && process.stdout.isTTY && !argv.legacy;
+const useTerminal = cluster.isMaster && process.stdout.isTTY && !argv.legacy && !argv._.length;
 
 export namespace Progress {
     export class Progress {
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index 1dc3fcc87..19c431f5f 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
 /* eslint-disable no-await-in-loop */
 import { ObjectID, Collection } from 'mongodb';
 import AdmZip from 'adm-zip';
@@ -28,6 +29,7 @@ const scripts: UpgradeScript[] = [
     },
     // Add history column to ddoc,drdoc,psdoc
     async function _1_2() {
+        const _FRESH_INSTALL_IGNORE = 1;
         const domains = await domain.getMulti().project({ _id: 1 }).toArray();
         for (const d of domains) {
             const bulk = document.coll.initializeUnorderedBulkOp();
@@ -46,10 +48,12 @@ const scripts: UpgradeScript[] = [
         return true;
     },
     async function _2_3() {
+        const _FRESH_INSTALL_IGNORE = 1;
         await db.collection('document').updateMany({ pid: /^\d+$/i }, { $unset: { pid: '' } });
         return true;
     },
     async function _3_4() {
+        const _FRESH_INSTALL_IGNORE = 1;
         if (storage.error) {
             logger.error('Cannot upgrade. Please change storage config.');
             return false;
@@ -133,6 +137,7 @@ const scripts: UpgradeScript[] = [
         return true;
     },
     async function _4_5() {
+        const _FRESH_INSTALL_IGNORE = 1;
         const domains = await domain.getMulti().project({ _id: 1 }).toArray();
         for (const d of domains) {
             const bulk = document.coll.initializeUnorderedBulkOp();
@@ -147,6 +152,7 @@ const scripts: UpgradeScript[] = [
     },
     async function _5_6() {
         // Issue #58
+        const _FRESH_INSTALL_IGNORE = 1;
         await domain.edit('system', { owner: 1 });
     },
 ];