Added user model

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;
+}