first commit

backend/src/app.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ConfigModule } from '@nestjs/config';
+import { ScheduleModule } from '@nestjs/schedule';
+import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
+import { CacheModule } from '@nestjs/cache-manager';
+import { APP_GUARD } from '@nestjs/core';
+
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { HealthModule } from './modules/health/health.module';
+import { UserModule } from './modules/user/user.module';
+import { AuthModule } from './modules/auth/auth.module';
+import { RepoModule } from './modules/repo/repo.module';
+
+@Module({
+  imports: [
+    ScheduleModule.forRoot(),
+    ConfigModule.forRoot({
+      isGlobal: true,
+      envFilePath: `.env.${process.env.NODE_ENV || 'development'}`,
+    }),
+    // 전역 캐시 매니저 — Redis 도입 시 store 옵션을 redisStore 로 변경
+    CacheModule.register({
+      isGlobal: true,
+      ttl: 60_000, // 60초 기본 TTL
+    }),
+    // 전역 Rate Limiter — main.ts 의 express-rate-limit 와 별개로 라우트 단위 제어 가능
+    ThrottlerModule.forRoot([
+      {
+        ttl: 60_000,
+        limit: 100,
+      },
+    ]),
+    TypeOrmModule.forRootAsync({
+      useFactory: () => {
+        const isProduction = process.env.NODE_ENV === 'production';
+        return {
+          type: 'postgres',
+          host: process.env.DB_HOST || 'db',
+          port: parseInt(process.env.DB_PORT || '5432', 10),
+          username:
+            process.env.DB_USER || process.env.DB_USERNAME || 'postgres',
+          password: process.env.DB_PASSWORD || 'password',
+          database:
+            process.env.DB_NAME || process.env.DB_DATABASE || 'project_db',
+          autoLoadEntities: true,
+          // 운영 환경에서는 절대 synchronize 사용 금지 (스키마 자동 변경 → 데이터 손실 위험)
+          synchronize: !isProduction,
+          migrationsRun: isProduction,
+          logging: !isProduction,
+          extra: {
+            max: 100,
+            connectionTimeoutMillis: 5000,
+            idleTimeoutMillis: 30000,
+          },
+          entities: [__dirname + '/**/*.entity{.ts,.js}'],
+          migrations: [__dirname + '/migrations/*{.ts,.js}'],
+        };
+      },
+    }),
+    HealthModule,
+    UserModule,
+    AuthModule,
+    RepoModule,
+  ],
+  controllers: [AppController],
+  providers: [
+    AppService,
+    {
+      provide: APP_GUARD,
+      useClass: ThrottlerGuard,
+    },
+  ],
+})
+export class AppModule {}