diff --git a/BE/src/asset/asset.entity.ts b/BE/src/asset/asset.entity.ts
index 2e010f4..eab36b9 100644
--- a/BE/src/asset/asset.entity.ts
+++ b/BE/src/asset/asset.entity.ts
@@ -1,8 +1,9 @@
-import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
+import { Column, Entity, PrimaryGeneratedColumn, Unique } from 'typeorm';
 
 const INIT_ASSET = 10000000;
 
 @Entity('assets')
+@Unique(['user_id'])
 export class Asset {
   @PrimaryGeneratedColumn()
   id: number;
diff --git a/BE/src/stock/bookmark/stock-bookmark.entity.ts b/BE/src/stock/bookmark/stock-bookmark.entity.ts
index 107a957..9e04e5c 100644
--- a/BE/src/stock/bookmark/stock-bookmark.entity.ts
+++ b/BE/src/stock/bookmark/stock-bookmark.entity.ts
@@ -1,6 +1,7 @@
-import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
+import { Column, Entity, PrimaryGeneratedColumn, Unique } from 'typeorm';
 
 @Entity('bookmarks')
+@Unique(['user_id', 'stock_code'])
 export class Bookmark {
   @PrimaryGeneratedColumn()
   id: number;
diff --git a/BE/src/stock/order/stock-order.entity.ts b/BE/src/stock/order/stock-order.entity.ts
index 7498b72..1c84d7b 100644
--- a/BE/src/stock/order/stock-order.entity.ts
+++ b/BE/src/stock/order/stock-order.entity.ts
@@ -2,19 +2,23 @@ import {
   Column,
   CreateDateColumn,
   Entity,
+  Index,
   PrimaryGeneratedColumn,
 } from 'typeorm';
 import { TradeType } from './enum/trade-type';
 import { StatusType } from './enum/status-type';
 
 @Entity('orders')
+@Index(['user_id', 'stock_code'])
 export class Order {
   @PrimaryGeneratedColumn()
   id: number;
 
+  @Index()
   @Column({ nullable: false })
   user_id: number;
 
+  @Index()
   @Column({ nullable: false })
   stock_code: string;