diff --git a/src/main/java/com/yunhai/dormnotice/common/listener/NoticeAuditListener.java b/src/main/java/com/yunhai/dormnotice/common/listener/NoticeAuditListener.java
index f2ea03e..308de9e 100644
--- a/src/main/java/com/yunhai/dormnotice/common/listener/NoticeAuditListener.java
+++ b/src/main/java/com/yunhai/dormnotice/common/listener/NoticeAuditListener.java
@@ -1,8 +1,7 @@
 package com.yunhai.dormnotice.common.listener;
 
 import com.yunhai.dormnotice.entity.BaseEntity;
-import com.yunhai.platform.auth.LoginUser;
-import com.yunhai.platform.auth.UserContextHolder;
+import com.yunhai.dormnotice.utils.UserContext;
 import org.springframework.stereotype.Component;
 
 import javax.persistence.PrePersist;
@@ -10,9 +9,10 @@ import javax.persistence.PreUpdate;
 import java.time.LocalDateTime;
 
 /**
- * JPA 审计监听器：在实体持久化/更新前自动填充创建人/更新人（平台当前登录人）与时间戳。
- * 对应 {@link BaseEntity} 的 createBy / updateBy / createTime / updateTime 字段。
- * 当前登录人取自基础平台 {@link UserContextHolder}。
+ * JPA 审计监听器：实体持久化/更新前自动填充创建人/更新人与时间戳。
+ * <p>决策 D4：{@code create_by / update_by} 存**当前登录用户 ID**（数字 id），不再存登录账号。
+ * id 取自 {@link UserContext#getUserId()}（由 ControllerUserContextAspect 在请求线程填充）；
+ * 无登录上下文（启动种子/系统任务）时为 null，保持原值。</p>
  */
 @Component
 public class NoticeAuditListener {
@@ -22,26 +22,26 @@ public class NoticeAuditListener {
         LocalDateTime now = LocalDateTime.now();
         entity.setCreateTime(now);
         entity.setUpdateTime(now);
-        String account = currentAccount();
-        if (account != null) {
+        Integer uid = currentUserId();
+        if (uid != null) {
             if (entity.getCreateBy() == null) {
-                entity.setCreateBy(account);
+                entity.setCreateBy(uid);
             }
-            entity.setUpdateBy(account);
+            entity.setUpdateBy(uid);
         }
     }
 
     @PreUpdate
     public void preUpdate(BaseEntity entity) {
         entity.setUpdateTime(LocalDateTime.now());
-        String account = currentAccount();
-        if (account != null) {
-            entity.setUpdateBy(account);
+        Integer uid = currentUserId();
+        if (uid != null) {
+            entity.setUpdateBy(uid);
         }
     }
 
-    private String currentAccount() {
-        LoginUser user = UserContextHolder.get();
-        return user == null ? null : user.getLoginName();
+    /** 当前登录用户 ID（数字）；无上下文返回 null。 */
+    private Integer currentUserId() {
+        return UserContext.getUserId();
     }
 }
diff --git a/src/main/java/com/yunhai/dormnotice/config/ReadBackfillRunner.java b/src/main/java/com/yunhai/dormnotice/config/ReadBackfillRunner.java
index 4a12bd4..46f1f85 100644
--- a/src/main/java/com/yunhai/dormnotice/config/ReadBackfillRunner.java
+++ b/src/main/java/com/yunhai/dormnotice/config/ReadBackfillRunner.java
@@ -42,26 +42,31 @@ public class ReadBackfillRunner implements ApplicationRunner {
         if (!enabled) {
             return;
         }
-        List<Receipt> acted = receiptRepository.findByStatusIn(java.util.Arrays.asList("confirmed", "filled"));
-        int added = 0;
-        for (Receipt r : acted) {
-            if (r.getNoticeId() == null || r.getStudentId() == null) {
-                continue;
+        try {
+            List<Receipt> acted = receiptRepository.findByStatusIn(java.util.Arrays.asList("confirmed", "filled"));
+            int added = 0;
+            for (Receipt r : acted) {
+                if (r.getNoticeId() == null || r.getStudentId() == null) {
+                    continue;
+                }
+                if (readRepository.existsByNoticeIdAndStudentId(r.getNoticeId(), r.getStudentId())) {
+                    continue;
+                }
+                DormNoticeRead rd = new DormNoticeRead();
+                rd.setNoticeId(r.getNoticeId());
+                rd.setStudentId(r.getStudentId());
+                rd.setRoomId(r.getRoomId());
+                rd.setReadAt(r.getSubmittedAt() != null ? r.getSubmittedAt() : LocalDateTime.now());
+                rd.setSchId(r.getSchId());
+                readRepository.save(rd);
+                added++;
             }
-            if (readRepository.existsByNoticeIdAndStudentId(r.getNoticeId(), r.getStudentId())) {
-                continue;
+            if (added > 0) {
+                log.info("[ReadBackfill] 依据已确认/已填报回执回填阅读记录 {} 条", added);
             }
-            DormNoticeRead rd = new DormNoticeRead();
-            rd.setNoticeId(r.getNoticeId());
-            rd.setStudentId(r.getStudentId());
-            rd.setRoomId(r.getRoomId());
-            rd.setReadAt(r.getSubmittedAt() != null ? r.getSubmittedAt() : LocalDateTime.now());
-            rd.setSchId(r.getSchId());
-            readRepository.save(rd);
-            added++;
-        }
-        if (added > 0) {
-            log.info("[ReadBackfill] 依据已确认/已填报回执回填阅读记录 {} 条", added);
+        } catch (Exception e) {
+            // 回填失败不得阻断启动（如列类型未迁移等）
+            log.warn("[ReadBackfill] 阅读记录回填跳过：{}", e.getMessage());
         }
     }
 }
diff --git a/src/main/java/com/yunhai/dormnotice/entity/BaseEntity.java b/src/main/java/com/yunhai/dormnotice/entity/BaseEntity.java
index 1804dd5..cf85e67 100644
--- a/src/main/java/com/yunhai/dormnotice/entity/BaseEntity.java
+++ b/src/main/java/com/yunhai/dormnotice/entity/BaseEntity.java
@@ -24,10 +24,10 @@ public abstract class BaseEntity implements Serializable {
     private Integer id;
 
     /**
-     * 创建人登录账号
+     * 创建人用户ID（数字；决策 D4，不存登录账号）
      */
     @Column(name = "create_by", updatable = false)
-    private String createBy;
+    private Integer createBy;
 
     /**
      * 创建时间
@@ -36,10 +36,10 @@ public abstract class BaseEntity implements Serializable {
     private LocalDateTime createTime;
 
     /**
-     * 更新人登录账号
+     * 更新人用户ID（数字；决策 D4，不存登录账号）
      */
     @Column(name = "update_by")
-    private String updateBy;
+    private Integer updateBy;
 
     /**
      * 更新时间