diff --git a/.coderabbit.yml b/.coderabbit.yml
new file mode 100644
index 00000000..5c0466b7
--- /dev/null
+++ b/.coderabbit.yml
@@ -0,0 +1,7 @@
+language: ko
+reviews:
+  auto_review:
+    enabled: true
+  base_branches:
+    - main
+    - dev
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index c2065bc2..992bd44c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,7 @@ out/
 
 ### VS Code ###
 .vscode/
+
+### Custom ###
+db_dev.mv.db
+db_dev.trace.db
\ No newline at end of file
diff --git a/src/main/java/com/back/domain/user/entity/User.java b/src/main/java/com/back/domain/user/entity/User.java
index f8a1d18c..5edbc08a 100644
--- a/src/main/java/com/back/domain/user/entity/User.java
+++ b/src/main/java/com/back/domain/user/entity/User.java
@@ -1,19 +1,12 @@
 package com.back.domain.user.entity;
 
 import jakarta.persistence.*;
-import jakarta.validation.constraints.Email;
-import jakarta.validation.constraints.NotBlank;
 import lombok.*;
 
 import java.time.LocalDateTime;
 
 @Entity
-@Table(
-        name = "users", // DB 테이블 이름: User 대신 users 권장 (예약어 충돌 방지)
-        indexes = {
-                @Index(name = "ux_users_email", columnList = "email", unique = true)
-        }
-)
+@Table(name = "users")  // 예약어 충돌 방지를 위해 "users" 권장
 @Getter
 @Setter
 @NoArgsConstructor
@@ -25,20 +18,21 @@ public class User {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @NotBlank
-    @Email
-    @Column(nullable = false, unique = true)
-    private String email;   // 유저 소셜 이메일 (OAuth2 로그인 시 저장)
+    // OAuth 동의 범위에 따라 이메일이 없을 수 있어 nullable
+    // 여러 provider에서 동일 이메일이 올 수 있으므로 unique 하지 않아도 됨
+    @Column(length = 100)
+    private String email;
 
-    @NotBlank
-    @Column(nullable = false, unique = true)
-    private String nickname;   // 유저 닉네임
+    @Column(nullable = false, unique = true, length = 50)
+    private String nickname;   // 고유 닉네임
 
-    private String profileImgUrl;   // 프로필 이미지 URL
-
-    private Double abvDegree;   // 온도(회원 등급)
+    private Double abvDegree;   // 알콜도수(회원 등급)
 
     private LocalDateTime createdAt;   // 생성 날짜
 
     private LocalDateTime updatedAt;   // 수정 날짜
+
+    @Builder.Default
+    @Column(nullable = false, length = 20)
+    private String role = "USER";
 }
\ No newline at end of file
diff --git a/src/main/java/com/back/domain/user/enums/AbvLevel.java b/src/main/java/com/back/domain/user/enums/AbvLevel.java
new file mode 100644
index 00000000..41e20a4a
--- /dev/null
+++ b/src/main/java/com/back/domain/user/enums/AbvLevel.java
@@ -0,0 +1,28 @@
+package com.back.domain.user.enums;
+
+public enum AbvLevel {
+    L1(1, 0, 10, "/img/grade/1.png"),
+    L2(2, 11, 25, "/img/grade/2.png"),
+    L3(3, 26, 45, "/img/grade/3.png"),
+    L4(4, 46, 65, "/img/grade/4.png"),
+    L5(5, 66, 85, "/img/grade/5.png"),
+    L6(6, 86, 100, "/img/grade/6.png");
+
+    public final int code;
+    public final int min, max;
+    public final String imagePath;
+
+    AbvLevel(int code, int min, int max, String imagePath) {
+        this.code = code;
+        this.min = min;
+        this.max = max;
+        this.imagePath = imagePath;
+    }
+
+    public static AbvLevel of(int percent) {
+        for (var lv : values()) {
+            if (percent >= lv.min && percent <= lv.max) return lv;
+        }
+        return L1; // 기본값
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/back/domain/user/service/UserService.java b/src/main/java/com/back/domain/user/service/UserService.java
new file mode 100644
index 00000000..103c5a97
--- /dev/null
+++ b/src/main/java/com/back/domain/user/service/UserService.java
@@ -0,0 +1,20 @@
+package com.back.domain.user.service;
+
+import com.back.domain.user.entity.User;
+import com.back.domain.user.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class UserService {
+
+    private final UserRepository userRepository;
+
+    @Transactional(readOnly = true)
+    public User findById(Long id) {
+        return userRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("User not found. id=" + id));
+    }
+}
\ No newline at end of file