feat: add medical test entities

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

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+import { Column, Entity, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { Question } from './question.entity';
+
+@Entity()
+export class Choice {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @ManyToOne(() => Question, (question) => question.choices, {
+    onDelete: 'CASCADE',
+  })
+  question: Question;
+
+  @Column({
+    type: 'varchar',
+    length: 255,
+    nullable: false,
+  })
+  text: string;
+
+  @Column({ type: 'int', nullable: false })
+  value: number;
+
+  @Column({ type: 'int', nullable: false })
+  order: number;
+}

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

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+import { Test } from '@/modules/tests/entities/test.entity';
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  ManyToOne,
+  OneToMany,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+import { QuestionType } from '../enums/question-type.enum';
+import type { QuestionMetadata } from '../types/question-metadata.type';
+import { Choice } from './choice.entity';
+
+@Entity()
+export class Question {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @ManyToOne(() => Test, (test) => test.questions, {
+    onDelete: 'CASCADE',
+  })
+  test: Test;
+
+  @Column({
+    type: 'enum',
+    enum: QuestionType,
+    default: QuestionType.MULTI_CHOICE,
+  })
+  type: QuestionType;
+
+  @Column({ type: 'text' })
+  content: string;
+
+  @Column({ type: 'int', nullable: false })
+  order: number;
+
+  @Column({ type: 'boolean', default: true })
+  required: boolean;
+
+  @Column({ type: 'jsonb', nullable: true })
+  metadata: QuestionMetadata;
+
+  @OneToMany(() => Choice, (choice) => choice.question)
+  choices?: Array<Choice>;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}

src/modules/questions/enums/question-type.enum.ts

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+export enum QuestionType {
+  MULTI_CHOICE = 'multi-choice',
+  NUMERIC = 'numeric',
+  TEXT = 'text',
+}

src/modules/questions/interfaces/multi-choice-metadata.interface.ts

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+export interface MultiChoiceMetadata {
+  allowOther?: boolean;
+}

src/modules/questions/interfaces/numeric-metadata.interface.ts

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+export interface NumericMetadata {
+  min: number;
+  max: number;
+  step?: number;
+}

src/modules/questions/questions.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Question } from './entities/question.entity';
+import { Choice } from './entities/choice.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Question, Choice])],
+})
+export class QuestionsModule {}

src/modules/questions/types/question-metadata.type.ts

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+import { MultiChoiceMetadata } from '../interfaces/multi-choice-metadata.interface';
+import { NumericMetadata } from '../interfaces/numeric-metadata.interface';
+
+export type QuestionMetadata = NumericMetadata | MultiChoiceMetadata;