优化目录结构

backend/src/main/java/com/openisle/model/ExperienceLog.java

@@ -0,0 +1,37 @@
+package com.openisle.model;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.time.LocalDate;
+
+/** Daily experience gain counts for a user. */
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@Table(name = "experience_logs",
+       uniqueConstraints = @UniqueConstraint(columnNames = {"user_id", "log_date"}))
+public class ExperienceLog {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Column(name = "log_date", nullable = false)
+    private LocalDate logDate;
+
+    @Column(name = "post_count", nullable = false)
+    private int postCount;
+
+    @Column(name = "comment_count", nullable = false)
+    private int commentCount;
+
+    @Column(name = "reaction_count", nullable = false)
+    private int reactionCount;
+}