feat add questions module and admin routes

src/modules/questions/entities/question.entity.ts

@@ -3,6 +3,7 @@ import {
   Column,
   CreateDateColumn,
   Entity,
+  Index,
   ManyToOne,
   OneToMany,
   PrimaryGeneratedColumn,
@@ -10,8 +11,10 @@ import {
 import { QuestionType } from '../enums/question-type.enum';
 import type { QuestionMetadata } from '../types/question-metadata.type';
 import { Choice } from './choice.entity';
+import { UNIQUE_TEST_ORDER_IDX } from '../constants';
 
 @Entity()
+@Index(UNIQUE_TEST_ORDER_IDX, ['test', 'order'], { unique: true })
 export class Question {
   @PrimaryGeneratedColumn()
   id!: number;
@@ -28,7 +31,7 @@ export class Question {
   })
   type!: QuestionType;
 
-  @Column({ type: 'text' })
+  @Column({ type: 'text', nullable: false })
   content!: string;
 
   @Column({ type: 'int', nullable: false })