[maimai2] Implement proper player rate saving

src/main/java/icu/samnyan/aqua/sega/maimai2/model/userdata/UserRate.java

@@ -4,38 +4,15 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
-import java.io.Serializable;
-
-import javax.persistence.*;
-
-import com.fasterxml.jackson.annotation.JsonIgnore;
-
 /**
  * @author samnyan (privateamusement@protonmail.com)
  */
-@Entity(name = "Maimai2UserRate")
-@Table(name = "maimai2_user_rate")
 @Data
 @AllArgsConstructor
 @NoArgsConstructor
-public class UserRate implements Serializable {
-
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @JsonIgnore
-    private long id;
-
-    @JsonIgnore
-    @ManyToOne
-    @JoinColumn(name = "user_id")
-    private UserDetail user;
-
+public class UserRate {
     private int musicId;
     private int level;
     private int romVersion;
     private int achievement;
-
-    public UserRate(UserDetail user) {
-        this.user = user;
-    }
 }