diff --git a/frontend/src/views/FaqManager.vue b/frontend/src/views/FaqManager.vue
index 4160276..eb30aff 100644
--- a/frontend/src/views/FaqManager.vue
+++ b/frontend/src/views/FaqManager.vue
@@ -106,7 +106,7 @@ const columns = [
 
 const statusOptions = [{label:'全部状态',value:''},{label:'启用',value:'ENABLED'},{label:'禁用',value:'DISABLED'}]
 const categoryOptions = computed(()=>[{label:'全部分类',value:''},...flatCategories.value.map(c=>({label:c.path,value:String(c.id)}))])
-const categoryOptions2 = computed(()=>[{label:'不分类',value:null as any},...flatCategories.value.map(c=>({label:c.path,value:c.id}))])
+const categoryOptions2 = computed(()=>[{label:'不分类',value:null as any},...flatCategories.value.map(c=>({label:c.path,value:String(c.id)}))])
 
 onMounted(() => { loadCategories(); loadList(); loadStats() })
 
diff --git a/src/main/java/com/wok/supportbot/controller/FaqController.java b/src/main/java/com/wok/supportbot/controller/FaqController.java
index 0944791..2ad1a88 100644
--- a/src/main/java/com/wok/supportbot/controller/FaqController.java
+++ b/src/main/java/com/wok/supportbot/controller/FaqController.java
@@ -71,9 +71,6 @@ public class FaqController {
             Long operatorId = body.get("operatorId") != null ? Long.valueOf(body.get("operatorId").toString()) : null;
             String remark = body.get("remark") != null ? body.get("remark").toString() : null;
 
-            if (feedbackId == null) {
-                return ResponseEntity.status(400).body(Map.of("success", false, "message", "feedbackId 不能为空"));
-            }
             if (question == null || question.isBlank()) {
                 return ResponseEntity.status(400).body(Map.of("success", false, "message", "问题内容不能为空"));
             }
@@ -118,9 +115,6 @@ public class FaqController {
             String originalAnswer = body.get("originalAnswer") != null ? body.get("originalAnswer").toString() : null;
             Long operatorId = body.get("operatorId") != null ? Long.valueOf(body.get("operatorId").toString()) : null;
 
-            if (feedbackId == null) {
-                return ResponseEntity.status(400).body(Map.of("success", false, "message", "feedbackId 不能为空"));
-            }
             if (similarQuestion == null || similarQuestion.isBlank()) {
                 return ResponseEntity.status(400).body(Map.of("success", false, "message", "相似问题不能为空"));
             }
@@ -156,9 +150,6 @@ public class FaqController {
             Long operatorId = body.get("operatorId") != null ? Long.valueOf(body.get("operatorId").toString()) : null;
             String remark = body.get("remark") != null ? body.get("remark").toString() : null;
 
-            if (feedbackId == null) {
-                return ResponseEntity.status(400).body(Map.of("success", false, "message", "feedbackId 不能为空"));
-            }
             if (answer == null || answer.isBlank()) {
                 return ResponseEntity.status(400).body(Map.of("success", false, "message", "答案内容不能为空"));
             }
diff --git a/src/main/java/com/wok/supportbot/entity/CategoryNode.java b/src/main/java/com/wok/supportbot/entity/CategoryNode.java
index 74cac6f..804a65e 100644
--- a/src/main/java/com/wok/supportbot/entity/CategoryNode.java
+++ b/src/main/java/com/wok/supportbot/entity/CategoryNode.java
@@ -1,5 +1,7 @@
 package com.wok.supportbot.entity;
 
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
@@ -24,6 +26,7 @@ public class CategoryNode implements Serializable {
     /**
      * 分类ID
      */
+    @JsonSerialize(using = ToStringSerializer.class)
     private Long id;
 
     /**
@@ -39,6 +42,7 @@ public class CategoryNode implements Serializable {
     /**
      * 父分类ID
      */
+    @JsonSerialize(using = ToStringSerializer.class)
     private Long parentId;
 
     /**
diff --git a/src/main/java/com/wok/supportbot/service/FaqService.java b/src/main/java/com/wok/supportbot/service/FaqService.java
index 08deb47..2ad621a 100644
--- a/src/main/java/com/wok/supportbot/service/FaqService.java
+++ b/src/main/java/com/wok/supportbot/service/FaqService.java
@@ -90,6 +90,9 @@ public class FaqService {
     private void linkAndMarkProcessed(Long feedbackId, Long faqId, String actionType,
                                        String originalQuestion, String originalAnswer,
                                        Long operatorId, String remark) {
+        if (feedbackId == null) {
+            return;
+        }
         FaqFeedbackLink link = FaqFeedbackLink.builder()
                 .feedbackId(feedbackId)
                 .faqId(faqId)
@@ -125,15 +128,17 @@ public class FaqService {
     public KnowledgeFaq createFromFeedback(KnowledgeFaq faq, Long feedbackId,
                                            String originalQuestion, String originalAnswer,
                                            Long operatorId, String remark) {
-        // 校验反馈（仅验证存在性）
-        if (messageFeedbackService.getById(feedbackId) == null) {
+        // 校验反馈（仅验证存在性），无反馈时降级为普通创建
+        if (feedbackId != null && messageFeedbackService.getById(feedbackId) == null) {
             throw new IllegalArgumentException("反馈不存在: feedbackId=" + feedbackId);
         }
 
         KnowledgeFaq created = create(faq);
 
-        // 记录关联关系 + 标记反馈已处理
-        linkAndMarkProcessed(feedbackId, created.getId(), "create", originalQuestion, originalAnswer, operatorId, remark);
+        // 记录关联关系 + 标记反馈已处理（仅当存在反馈时）
+        if (feedbackId != null) {
+            linkAndMarkProcessed(feedbackId, created.getId(), "create", originalQuestion, originalAnswer, operatorId, remark);
+        }
 
         return created;
     }
@@ -157,8 +162,7 @@ public class FaqService {
         if (existing == null) {
             throw new IllegalArgumentException("FAQ 不存在: id=" + faqId);
         }
-        MessageFeedback feedback = messageFeedbackService.getById(feedbackId);
-        if (feedback == null) {
+        if (feedbackId != null && messageFeedbackService.getById(feedbackId) == null) {
             throw new IllegalArgumentException("反馈不存在: feedbackId=" + feedbackId);
         }
         if (similarQuestion == null || similarQuestion.isBlank()) {
@@ -180,8 +184,10 @@ public class FaqService {
             computeEmbeddingAsync(faqId, existing.getQuestion());
         }
 
-        // 记录关联关系 + 标记反馈已处理
-        linkAndMarkProcessed(feedbackId, faqId, "append_similar", trimmed, originalAnswer, operatorId, remark);
+        // 记录关联关系 + 标记反馈已处理（仅当存在反馈时）
+        if (feedbackId != null) {
+            linkAndMarkProcessed(feedbackId, faqId, "append_similar", trimmed, originalAnswer, operatorId, remark);
+        }
 
         return existing;
     }
@@ -205,8 +211,7 @@ public class FaqService {
         if (existing == null) {
             throw new IllegalArgumentException("FAQ 不存在: id=" + faqId);
         }
-        MessageFeedback feedback = messageFeedbackService.getById(feedbackId);
-        if (feedback == null) {
+        if (feedbackId != null && messageFeedbackService.getById(feedbackId) == null) {
             throw new IllegalArgumentException("反馈不存在: feedbackId=" + feedbackId);
         }
         if (answer == null || answer.isBlank()) {
@@ -220,8 +225,10 @@ public class FaqService {
         // 答案变更也重新计算向量（语义可能变化）
         computeEmbeddingAsync(faqId, existing.getQuestion());
 
-        // 记录关联关系 + 标记反馈已处理
-        linkAndMarkProcessed(feedbackId, faqId, "edit_answer", originalQuestion, answer, operatorId, remark);
+        // 记录关联关系 + 标记反馈已处理（仅当存在反馈时）
+        if (feedbackId != null) {
+            linkAndMarkProcessed(feedbackId, faqId, "edit_answer", originalQuestion, answer, operatorId, remark);
+        }
 
         return existing;
     }