물리아키텍처 설계 완료

✨ 주요 기능
- Azure 기반 물리아키텍처 설계 (개발환경/운영환경)
- 7개 마이크로서비스 물리 구조 설계
- 네트워크 아키텍처 다이어그램 작성 (Mermaid)
- 환경별 비교 분석 및 마스터 인덱스 문서

📁 생성 파일
- design/backend/physical/physical-architecture.md (마스터)
- design/backend/physical/physical-architecture-dev.md (개발환경)
- design/backend/physical/physical-architecture-prod.md (운영환경)
- design/backend/physical/*.mmd (4개 Mermaid 다이어그램)

🎯 핵심 성과
- 비용 최적화: 개발환경 월 $143, 운영환경 월 $2,860
- 확장성: 개발환경 100명 → 운영환경 10,000명 (100배)
- 가용성: 개발환경 95% → 운영환경 99.9%
- 보안: 다층 보안 아키텍처 (L1~L4)

🛠️ 기술 스택
- Azure Kubernetes Service (AKS)
- Azure Database for PostgreSQL Flexible
- Azure Cache for Redis Premium
- Azure Service Bus Premium
- Application Gateway + WAF

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

design/backend/database/event-service-erd.puml

@@ -0,0 +1,164 @@
+@startuml
+!theme mono
+
+title Event Service ERD (Entity Relationship Diagram)
+
+' ==============================
+' 엔티티 정의
+' ==============================
+
+entity "events" as events {
+  * event_id : UUID <<PK>>
+  --
+  * user_id : UUID <<INDEX>>
+  * store_id : UUID <<INDEX>>
+    event_name : VARCHAR(200)
+    description : TEXT
+  * objective : VARCHAR(100)
+    start_date : DATE
+    end_date : DATE
+  * status : VARCHAR(20) <<DEFAULT 'DRAFT'>>
+    selected_image_id : UUID
+    selected_image_url : VARCHAR(500)
+    channels : TEXT
+  * created_at : TIMESTAMP
+  * updated_at : TIMESTAMP
+}
+
+entity "ai_recommendations" as ai_recommendations {
+  * recommendation_id : UUID <<PK>>
+  --
+  * event_id : UUID <<FK>>
+  * event_name : VARCHAR(200)
+  * description : TEXT
+  * promotion_type : VARCHAR(50)
+  * target_audience : VARCHAR(100)
+  * is_selected : BOOLEAN <<DEFAULT FALSE>>
+  * created_at : TIMESTAMP
+  * updated_at : TIMESTAMP
+}
+
+entity "generated_images" as generated_images {
+  * image_id : UUID <<PK>>
+  --
+  * event_id : UUID <<FK>>
+  * image_url : VARCHAR(500)
+  * style : VARCHAR(50)
+  * platform : VARCHAR(50)
+  * is_selected : BOOLEAN <<DEFAULT FALSE>>
+  * created_at : TIMESTAMP
+  * updated_at : TIMESTAMP
+}
+
+entity "jobs" as jobs {
+  * job_id : UUID <<PK>>
+  --
+  * event_id : UUID
+  * job_type : VARCHAR(50)
+  * status : VARCHAR(20) <<DEFAULT 'PENDING'>>
+  * progress : INT <<DEFAULT 0>>
+    result_key : VARCHAR(200)
+    error_message : TEXT
+    completed_at : TIMESTAMP
+  * created_at : TIMESTAMP
+  * updated_at : TIMESTAMP
+}
+
+' ==============================
+' 관계 정의
+' ==============================
+
+events ||--o{ ai_recommendations : "has many"
+events ||--o{ generated_images : "has many"
+events ||--o{ jobs : "tracks"
+
+' ==============================
+' 제약조건 노트
+' ==============================
+
+note right of events
+  **핵심 도메인 엔티티**
+  - 상태 머신: DRAFT → PUBLISHED → ENDED
+  - DRAFT에서만 수정 가능
+  - PUBLISHED에서 END만 가능
+  - channels: JSON 배열 (["SMS", "EMAIL"])
+
+  **인덱스**:
+  - IDX_events_user_id (user_id)
+  - IDX_events_store_id (store_id)
+  - IDX_events_status (status)
+  - IDX_events_user_status (user_id, status)
+
+  **체크 제약조건**:
+  - status IN ('DRAFT', 'PUBLISHED', 'ENDED')
+  - start_date <= end_date
+end note
+
+note right of ai_recommendations
+  **AI 추천 결과**
+  - 이벤트당 최대 3개 생성
+  - is_selected=true는 이벤트당 1개만
+
+  **인덱스**:
+  - IDX_recommendations_event_id (event_id)
+  - IDX_recommendations_selected (event_id, is_selected)
+
+  **외래 키**:
+  - FK_recommendations_event (event_id)
+    → events(event_id) ON DELETE CASCADE
+end note
+
+note right of generated_images
+  **생성 이미지 정보**
+  - 여러 스타일/플랫폼 조합 가능
+  - is_selected=true는 이벤트당 1개만
+
+  **인덱스**:
+  - IDX_images_event_id (event_id)
+  - IDX_images_selected (event_id, is_selected)
+
+  **외래 키**:
+  - FK_images_event (event_id)
+    → events(event_id) ON DELETE CASCADE
+end note
+
+note right of jobs
+  **비동기 작업 추적**
+  - job_type: AI_RECOMMENDATION, IMAGE_GENERATION
+  - status: PENDING → PROCESSING → COMPLETED/FAILED
+  - progress: 0-100
+
+  **인덱스**:
+  - IDX_jobs_event_id (event_id)
+  - IDX_jobs_type_status (job_type, status)
+  - IDX_jobs_status (status)
+
+  **체크 제약조건**:
+  - status IN ('PENDING', 'PROCESSING', 'COMPLETED', 'FAILED')
+  - job_type IN ('AI_RECOMMENDATION', 'IMAGE_GENERATION')
+  - progress BETWEEN 0 AND 100
+
+  **외래 키 없음**: 이벤트 삭제 후에도 작업 이력 보존
+end note
+
+' ==============================
+' Redis 캐시 노트
+' ==============================
+
+note top of events
+  **Redis 캐시 전략**
+
+  1. event:session:{userId} (TTL: 3600s)
+     - 이벤트 생성 세션 정보
+     - Hash: eventId, objective, storeId, createdAt
+
+  2. event:draft:{eventId} (TTL: 1800s)
+     - DRAFT 상태 이벤트 캐시
+     - Hash: eventName, description, objective, status, userId, storeId
+
+  3. job:status:{jobId} (TTL: 600s)
+     - 작업 상태 실시간 조회
+     - Hash: jobType, status, progress, eventId
+end note
+
+@enduml