diff --git a/backend/libs/database/user.entity.ts b/backend/libs/database/user.entity.ts
new file mode 100644
index 0000000..48317eb
--- /dev/null
+++ b/backend/libs/database/user.entity.ts
@@ -0,0 +1,14 @@
+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity()
+export class User {
+    constructor(props?: Partial<User>) {
+        Object.assign(this, props);
+    }
+
+    @PrimaryColumn()
+    public id!: string;
+
+    @Column({ nullable: true })
+    public user_name: string;
+}
diff --git a/backend/libs/libs.module.ts b/backend/libs/libs.module.ts
new file mode 100644
index 0000000..6761b66
--- /dev/null
+++ b/backend/libs/libs.module.ts
@@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { User } from './database/user.entity';
+@Module({
+    imports: [TypeOrmModule.forFeature([User])],
+    exports: [TypeOrmModule],
+})
+export class LibsModule {}
diff --git a/backend/src/modules/initialization/app.init.service.ts b/backend/src/modules/initialization/app.init.service.ts
new file mode 100644
index 0000000..e22de72
--- /dev/null
+++ b/backend/src/modules/initialization/app.init.service.ts
@@ -0,0 +1,11 @@
+import { Injectable, OnModuleInit } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { User } from 'libs/database/user.entity';
+import { Repository } from 'typeorm';
+
+@Injectable()
+export class AppInitService implements OnModuleInit {
+    constructor(@InjectRepository(User) private userRepository: Repository<User>) {}
+
+    async onModuleInit() {}
+}