docs: ERD 작성

Author: Kimjipang

docs/design/04-erd.md

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+# ERD
+
+```mermaid
+erDiagram
+    users {
+        bigint id PK "NOT NULL | 사용자 ID"
+        varchar login_id "NOT NULL | 로그인 ID"
+        varchar email "NOT NULL | 이메일"
+        varchar password "NOT NULL | 비밀번호"
+        varchar gender "NOT NULL | 성별"
+        varchar birth "NOT NULL | 생년월일"
+        timestamp created_at "NOT NULL | 생성일시"
+        timestamp updated_at "NOT NULL | 수정일시"
+        timestamp deleted_at "삭제일시"
+    }
+
+    point {
+        bigint id PK "NOT NULL | 포인트 ID"
+        bigint ref_ser_id "NOT NULL | 사용자 ID"
+        int balance "NOT NULL | 잔액"
+    }
+
+    brand {
+        bigint id PK "NOT NULL | 브랜드 ID"
+        varchar name "NOT NULL | 브랜드명"
+        varchar description "브랜드 설명"
+        timestamp created_at "NOT NULL | 생성일시"
+        timestamp updated_at "수정일시"
+        timestamp deleted_at "삭제일시"
+    }
+
+    product {
+        bigint id PK "NOT NULL | 상품 ID"
+        bigint ref_brand_id "NOT NULL | 브랜드 ID"
+        varchar name "NOT NULL | 상품명"
+        decimal price "NOT NULL | 기본금액"
+        int stock "NOT NULL | 재고"
+        timestamp created_at "NOT NULL | 생성일시"
+        timestamp updated_at "수정일시"
+        timestamp deleted_at "삭제일시"
+    }
+
+	  like {
+        bigint id PK "NOT NULL | 좋아요 ID"
+        bigint ref_product_id "NOT NULL | 상품 ID"
+        bigint ref_user_id "NOT NULL | 사용자 ID"
+        timestamp created_at "NOT NULL | 생성일시"
+    }
+    
+    cart {
+		    bigint id PK "NOT NULL | 장바구니 ID"
+		    bigint ref_user_id "NOT NULL | 사용자 ID"
+		
+		}
+		
+		cart_item {
+				bigint id PK "NOT NULL | 장바구니에 담긴 상품 ID"
+				bigint ref_cart_id "NOT NULL | 장바구니 ID"
+				bigint ref_product_id "NOT NULL | 상품 ID"
+				varchar name "NOT NULL | 상품 이름"
+				int quantity "NOT NULL | 수량"
+		}				
+
+    order {
+        bigint id PK "NOT NULL | 주문 ID"
+        bigint ref_user_id "NOT NULL | 사용자 ID"
+        decimal total_price "NOT NULL | 총 주문 금액"
+        varchar status "NOT NULL | 주문 상태"
+        timestamp created_at "NOT NULL | 주문 일시"
+        timestamp updated_at "수정일시"
+        timestamp deleted_at "삭제일시"
+    }
+
+    order_item {
+        bigint id PK "NOT NULL | 주문 상품 ID"
+        bigint ref_order_id "NOT NULL | 주문 ID"
+        bigint ref_product_id "NOT NULL | 상품 ID"
+        int quantity "NOT NULL | 수량"
+        decimal price "NOT NULL | 금액"
+    }
+
+    payment {
+				bigint id PK "NOT NULL | 결제 ID"
+        bigint ref_order_id "NOT NULL | 주문 ID"
+        decimal total_price "NOT NULL | 주문금액"
+        varchar method "NOT NULL | 주문방법"
+        varchar status "NOT NULL | 주문상태"
+        timestamp created_at "생성일시"
+        timestamp updated_at "수정일시"
+        timestamp deleted_at "삭제일시"
+        timestamp approved_at "결제 승인 일시"
+    }
+
+    users ||--o{ point : "has"
+    users ||--o{ like : "likes"
+    product ||--o{ like : "is liked by"
+    brand ||--o{ product : "owns"
+    users ||--o{ cart : "has"
+    cart ||--o{ cart_item : "contains"
+    product ||--o{ cart_item : "in"
+    users ||--o{ order : "places"
+    order ||--o{ order_item : "contains"
+    product ||--o{ order_item : "included in"
+    order ||--|| payment : "is paid by"
+```