修改代码格式；

数据库查询加 lean 判断；
其它内容微调。

web-server/app/db/BaseModel.ts

@@ -3,13 +3,13 @@ import { prop, pre } from '@typegoose/typegoose';
 /**
   * BaseModel
 */
-@pre<BaseModel>('save', function (next) {
+@pre<BaseModel>('save', function(next) {
   if (!this.createdAt || this.isNew) {
-    this.createdAt = this.updatedAt = new Date()
+    this.createdAt = this.updatedAt = new Date();
   } else {
-    this.updatedAt = new Date()
+    this.updatedAt = new Date();
   }
-  next()
+  next();
 })
 
 export default class BaseModel {
@@ -21,4 +21,4 @@ export default class BaseModel {
 
   @prop()
   updatedAt: Date
-}
+}