Add badge-to-user relationship and assign badge on achievement unlock

src/achievement/achievement.controller.ts

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+import { Controller, Get, Param } from '@nestjs/common';
+import { Repository } from 'typeorm';
+import { UserAchievement } from './entities/user-achievement.entity';
+import { InjectRepository } from '@nestjs/typeorm';
+
+@Controller('achievements')
+export class AchievementController {
+    constructor(
+        @InjectRepository(UserAchievement)
+        private readonly userAchievementRepo: Repository<UserAchievement>
+    ) {}
+@Get('/users/:id/achievements')
+public async getUserAchievements(@Param('id') userId: string) {
+  const unlocked = await this.userAchievementRepo.find({
+    where: { user: { id: userId } },
+    relations: ['achievement'],
+  });
+
+  return unlocked.map((ua) => ({
+    id: ua.achievement.id,
+    title: ua.achievement.title,
+    description: ua.achievement.description,
+    iconUrl: ua.achievement.iconUrl,
+    unlockedAt: ua.unlockedAt,
+  }));
+}
+}

src/achievement/achievement.module.ts

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+import { Module } from '@nestjs/common';
+import { AchievementController } from './achievement.controller';
+import { AchievementService } from './providers/achievement.service';
+import { AchievementUnlockerProvider } from './providers/achievement-unlocker.service';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { UserAchievement } from './entities/user-achievement.entity';
+import { Achievement } from './entities/achievement.entity';
+import { LeaderboardEntry } from 'src/leaderboard/entities/leaderboard.entity';
+import { Badge } from 'src/badge/entities/badge.entity';
+import { User } from 'src/users/user.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Achievement, UserAchievement, LeaderboardEntry, Badge, User])],
+  controllers: [AchievementController],
+  providers: [AchievementService, AchievementUnlockerProvider],
+  exports: [AchievementService]
+})
+export class AchievementModule {}

src/achievement/entities/achievement.entity.ts

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+import { Column, CreateDateColumn, Entity, PrimaryGeneratedColumn } from "typeorm";
+
+@Entity('achievements')
+export class Achievement {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  title: string;
+
+  @Column()
+  description: string;
+
+  @Column()
+  iconUrl: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}