diff --git a/src/main/java/com/yunhai/cms/controller/api/AttachmentController.java b/src/main/java/com/yunhai/cms/controller/api/AttachmentController.java
index 4a7d94a..faa5a3a 100644
--- a/src/main/java/com/yunhai/cms/controller/api/AttachmentController.java
+++ b/src/main/java/com/yunhai/cms/controller/api/AttachmentController.java
@@ -26,13 +26,14 @@ public class AttachmentController {
 
     private final AttachmentService attachmentService;
 
-    /** 上传（multipart：file 必填；articleId 可空） */
+    /** 上传（multipart：file 必填；articleId 可空；scene 可空 banner/link/site，B2 初步标记） */
     @PostMapping("/upload")
     public AttachmentVo upload(BoaUser authUserWithDept,
                                @RequestParam("siteId") Integer siteId,
                                @RequestParam(value = "articleId", required = false) Integer articleId,
+                               @RequestParam(value = "scene", required = false) String scene,
                                @RequestParam("file") MultipartFile file) {
-        return attachmentService.upload(authUserWithDept, siteId, articleId, file);
+        return attachmentService.upload(authUserWithDept, siteId, articleId, scene, file);
     }
 
     /** 附件列表（orphanOnly=true 仅孤儿） */
diff --git a/src/main/java/com/yunhai/cms/entity/CmsAttachment.java b/src/main/java/com/yunhai/cms/entity/CmsAttachment.java
index 41e6d1a..02908b6 100644
--- a/src/main/java/com/yunhai/cms/entity/CmsAttachment.java
+++ b/src/main/java/com/yunhai/cms/entity/CmsAttachment.java
@@ -10,14 +10,17 @@ import javax.persistence.Table;
 
 /**
  * CMS 附件（正文图片 + 文档附件 + 轮播图/友链 Logo 复用同一上传链路，方案 §7.3）。
- * 文章删除时附件记录保留、article_id 置空成"孤儿"，由附件管理页清理。
+ * 引用模型（B2）：articleId 仅服务文章编辑器回填链路；非文章场景（轮播/友链/站点配置）
+ * 用 refType/refId 标记。未使用 = 无文章引用且无场景引用（articleId 与 refType 均空）；
+ * 文章删除仅 article_id 置空，场景引用由各保存点按 webUrl 反查回写/解引用。
  */
 @Getter
 @Setter
 @Entity
 @Table(name = "cms_attachment", indexes = {
         @Index(name = "idx_att_article", columnList = "article_id"),
-        @Index(name = "idx_att_site", columnList = "site_id")})
+        @Index(name = "idx_att_site", columnList = "site_id"),
+        @Index(name = "idx_att_ref", columnList = "ref_type, ref_id")})
 public class CmsAttachment extends BaseEntity {
 
     /** 所属站点 */
@@ -28,6 +31,14 @@ public class CmsAttachment extends BaseEntity {
     @Column(name = "article_id")
     private Integer articleId;
 
+    /** 场景引用类型（B2）：banner=轮播 / link=友链 / site=站点配置；空=无场景引用 */
+    @Column(name = "ref_type", length = 16)
+    private String refType;
+
+    /** 场景引用对象 ID（轮播/友链/站点各自业务主键） */
+    @Column(name = "ref_id")
+    private Integer refId;
+
     /** 原始文件名 */
     @Column(name = "file_name", nullable = false, length = 255)
     private String fileName;
diff --git a/src/main/java/com/yunhai/cms/model/vo/AttachmentVo.java b/src/main/java/com/yunhai/cms/model/vo/AttachmentVo.java
index 25ba7b6..4eb748b 100644
--- a/src/main/java/com/yunhai/cms/model/vo/AttachmentVo.java
+++ b/src/main/java/com/yunhai/cms/model/vo/AttachmentVo.java
@@ -15,6 +15,9 @@ public class AttachmentVo {
 
     private Integer articleId;
 
+    /** 场景引用类型（B2）：banner/link/site；空=无场景引用 */
+    private String refType;
+
     private String fileName;
 
     /** Web 访问 URL（编辑器/封面/轮播直接引用） */
@@ -26,7 +29,7 @@ public class AttachmentVo {
 
     private String createTime;
 
-    /** 是否孤儿（文章已删除/未关联） */
+    /** 是否未使用（B2：无文章引用且无场景引用） */
     private boolean orphan;
 
     public static AttachmentVo of(CmsAttachment a) {
@@ -34,12 +37,13 @@ public class AttachmentVo {
         vo.setId(a.getId());
         vo.setSiteId(a.getSiteId());
         vo.setArticleId(a.getArticleId());
+        vo.setRefType(a.getRefType());
         vo.setFileName(a.getFileName());
         vo.setUrl(a.getWebUrl());
         vo.setFileSize(a.getFileSize());
         vo.setMimeType(a.getMimeType());
         vo.setCreateTime(a.getCreateTime() == null ? null : a.getCreateTime().toString());
-        vo.setOrphan(a.getArticleId() == null);
+        vo.setOrphan(a.getArticleId() == null && a.getRefType() == null);
         return vo;
     }
 }
diff --git a/src/main/java/com/yunhai/cms/repository/CmsAttachmentRepository.java b/src/main/java/com/yunhai/cms/repository/CmsAttachmentRepository.java
index 53baedc..93a4367 100644
--- a/src/main/java/com/yunhai/cms/repository/CmsAttachmentRepository.java
+++ b/src/main/java/com/yunhai/cms/repository/CmsAttachmentRepository.java
@@ -9,6 +9,7 @@ import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
 import java.util.List;
+import java.util.Optional;
 
 public interface CmsAttachmentRepository extends JpaRepository<CmsAttachment, Integer> {
 
@@ -19,10 +20,15 @@ public interface CmsAttachmentRepository extends JpaRepository<CmsAttachment, In
     /** 编辑器图片上传时先按路径去重绑定，避免重复行 */
     long countBySiteIdAndFilePath(Integer siteId, String filePath);
 
-    /** 孤儿附件（文章已删除：article_id is null） */
-    Page<CmsAttachment> findBySiteIdAndArticleIdIsNull(Integer siteId, Pageable pageable);
+    /** 未使用附件（B2 语义：无文章引用且无场景引用） */
+    Page<CmsAttachment> findBySiteIdAndArticleIdIsNullAndRefTypeIsNull(Integer siteId, Pageable pageable);
 
-    long countBySiteIdAndArticleIdIsNull(Integer siteId);
+    long countBySiteIdAndArticleIdIsNullAndRefTypeIsNull(Integer siteId);
+
+    /** 按 webUrl 反查（B2 保存点引用回写；webUrl 全站唯一由 uuid32 文件名保证，查询仍带 siteId 防御） */
+    Optional<CmsAttachment> findBySiteIdAndWebUrl(Integer siteId, String webUrl);
+
+    List<CmsAttachment> findByRefTypeAndRefId(String refType, Integer refId);
 
     @Modifying
     @Query("update CmsAttachment a set a.articleId = :articleId where a.id in :ids")
diff --git a/src/main/java/com/yunhai/cms/service/impl/AttachmentService.java b/src/main/java/com/yunhai/cms/service/impl/AttachmentService.java
index 8a587a2..3ebbda2 100644
--- a/src/main/java/com/yunhai/cms/service/impl/AttachmentService.java
+++ b/src/main/java/com/yunhai/cms/service/impl/AttachmentService.java
@@ -56,6 +56,9 @@ public class AttachmentService {
     private static final List<String> IMAGE_EXTS = Arrays.asList(
             "jpg", "jpeg", "png", "gif", "webp", "bmp", "ico");
 
+    /** 上传 scene 白名单（B2 附件引用模型）：banner=轮播 / link=友链 / site=站点配置 */
+    private static final List<String> ALLOWED_SCENES = Arrays.asList("banner", "link", "site");
+
     private final CmsAttachmentRepository attachmentRepository;
     private final SiteService siteService;
 
@@ -66,10 +69,13 @@ public class AttachmentService {
     @Value("${FILE_WEB_PATH:/cms/upload/}")
     private String fileWebPath;
 
-    /** 上传（编辑器图片/附件/轮播图/Logo 复用）；articleId 可空 */
+    /** 上传（编辑器图片/附件/轮播图/Logo 复用）；articleId 可空；scene 可空（banner/link/site，B2 初步标记） */
     @Transactional
-    public AttachmentVo upload(BoaUser user, Integer siteId, Integer articleId, MultipartFile file) {
+    public AttachmentVo upload(BoaUser user, Integer siteId, Integer articleId, String scene, MultipartFile file) {
         CmsSite site = siteService.requireManageable(user, siteId);
+        if (StringUtils.hasText(scene) && !ALLOWED_SCENES.contains(scene)) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "scene 非法：" + scene + "（仅 banner/link/site）");
+        }
         if (file == null || file.isEmpty()) {
             throw new BizException(ErrorCode.PARAM_ERROR, "上传文件不能为空");
         }
@@ -101,6 +107,7 @@ public class AttachmentService {
         CmsAttachment attachment = new CmsAttachment();
         attachment.setSiteId(site.getId());
         attachment.setArticleId(articleId);
+        attachment.setRefType(StringUtils.hasText(scene) ? scene : null);
         attachment.setFileName(originalName);
         attachment.setFilePath(relativePath);
         attachment.setWebUrl(webUrl);
@@ -110,14 +117,14 @@ public class AttachmentService {
         return AttachmentVo.of(attachment);
     }
 
-    /** 附件列表（orphanOnly=true 时仅孤儿，附件管理页清理用） */
+    /** 附件列表（unusedOnly=true 时仅未使用：无文章引用且无场景引用，附件管理页清理用） */
     public Map<String, Object> page(BoaUser user, Integer siteId, boolean orphanOnly,
                                     Integer page, Integer pageSize) {
         siteService.requireManageable(user, siteId);
         int pageIndex = page == null || page < 1 ? 0 : page - 1;
         int size = pageSize == null || pageSize < 1 ? 10 : pageSize;
         Page<CmsAttachment> result = orphanOnly
-                ? attachmentRepository.findBySiteIdAndArticleIdIsNull(siteId,
+                ? attachmentRepository.findBySiteIdAndArticleIdIsNullAndRefTypeIsNull(siteId,
                         PageRequest.of(pageIndex, size, Sort.by(Sort.Direction.DESC, "createTime")))
                 : attachmentRepository.findBySiteId(siteId,
                         PageRequest.of(pageIndex, size, Sort.by(Sort.Direction.DESC, "createTime")));
@@ -128,10 +135,55 @@ public class AttachmentService {
         Map<String, Object> map = new HashMap<>();
         map.put("total", result.getTotalElements());
         map.put("list", list);
-        map.put("orphanCount", attachmentRepository.countBySiteIdAndArticleIdIsNull(siteId));
+        map.put("unusedCount", attachmentRepository.countBySiteIdAndArticleIdIsNullAndRefTypeIsNull(siteId));
         return map;
     }
 
+    /**
+     * 场景引用回写（B2）：各保存点按 webUrl 反查并标记（webUrl 全站唯一由 uuid32 文件名保证）。
+     * 外链地址/找不到记录时静默跳过；幂等（重复标记同一引用无副作用）。
+     */
+    @Transactional
+    public void markUsed(Integer siteId, String webUrl, String refType, Integer refId) {
+        if (!StringUtils.hasText(webUrl)) {
+            return;
+        }
+        attachmentRepository.findBySiteIdAndWebUrl(siteId, webUrl).ifPresent(a -> {
+            a.setRefType(refType);
+            a.setRefId(refId);
+            attachmentRepository.save(a);
+        });
+    }
+
+    /** 场景引用解除（B2）：对象删除/换图时按引用清空；幂等（无匹配记录为 no-op） */
+    @Transactional
+    public void release(String refType, Integer refId) {
+        List<CmsAttachment> refs = attachmentRepository.findByRefTypeAndRefId(refType, refId);
+        for (CmsAttachment a : refs) {
+            a.setRefType(null);
+            a.setRefId(null);
+        }
+        attachmentRepository.saveAll(refs);
+    }
+
+    /**
+     * 站点配置引用回写（B2）：config_json 中 logo/favicon 指向本地上传路径（FILE_WEB_PATH 前缀）时
+     * 标记 ref_type=site。先整体解引用再回填当前值，天然覆盖换图/清空两种编辑路径。
+     */
+    @Transactional
+    public void markSiteConfigUsed(Integer siteId, Map<String, Object> config) {
+        release("site", siteId);
+        if (config == null || !StringUtils.hasText(fileWebPath)) {
+            return;
+        }
+        for (String key : new String[]{"logo", "favicon"}) {
+            Object value = config.get(key);
+            if (value instanceof String && ((String) value).startsWith(fileWebPath)) {
+                markUsed(siteId, (String) value, "site", siteId);
+            }
+        }
+    }
+
     /** 删除附件记录（不删物理文件，运维定期清理磁盘，避免误删被引用文件） */
     @Transactional
     public void delete(BoaUser user, DeleteRequest req) {
diff --git a/src/main/java/com/yunhai/cms/service/impl/BannerService.java b/src/main/java/com/yunhai/cms/service/impl/BannerService.java
index b8a08d0..902e410 100644
--- a/src/main/java/com/yunhai/cms/service/impl/BannerService.java
+++ b/src/main/java/com/yunhai/cms/service/impl/BannerService.java
@@ -34,6 +34,7 @@ public class BannerService {
     private final CmsCategoryRepository categoryRepository;
     private final SiteService siteService;
     private final ApplicationEventPublisher eventPublisher;
+    private final AttachmentService attachmentService;
 
     public List<BannerVo> list(BoaUser user, Integer siteId, String position) {
         siteService.requireManageable(user, siteId);
@@ -81,6 +82,9 @@ public class BannerService {
         }
         banner.setStatus(req.getStatus() == null ? 1 : req.getStatus());
         banner = bannerRepository.save(banner);
+        // B2 附件引用：先解引用再回写新图（编辑换图时旧图回未使用）；幂等
+        attachmentService.release("banner", banner.getId());
+        attachmentService.markUsed(site.getId(), req.getImageUrl(), "banner", banner.getId());
         eventPublisher.publishEvent(new SiteContentChangedEvent(site.getId(), "banner"));
         return BannerVo.of(banner);
     }
@@ -94,6 +98,7 @@ public class BannerService {
             throw new BizException(ErrorCode.FORBIDDEN, "无权删除该轮播");
         }
         bannerRepository.delete(banner);
+        attachmentService.release("banner", banner.getId());
         eventPublisher.publishEvent(new SiteContentChangedEvent(site.getId(), "banner"));
     }
 
diff --git a/src/main/java/com/yunhai/cms/service/impl/LinkService.java b/src/main/java/com/yunhai/cms/service/impl/LinkService.java
index f21f6d8..a686e22 100644
--- a/src/main/java/com/yunhai/cms/service/impl/LinkService.java
+++ b/src/main/java/com/yunhai/cms/service/impl/LinkService.java
@@ -29,6 +29,7 @@ public class LinkService {
     private final CmsLinkRepository linkRepository;
     private final SiteService siteService;
     private final ApplicationEventPublisher eventPublisher;
+    private final AttachmentService attachmentService;
 
     public List<LinkVo> list(BoaUser user, Integer siteId) {
         siteService.requireManageable(user, siteId);
@@ -66,6 +67,11 @@ public class LinkService {
         link.setSortNo(req.getSortNo() == null ? 0 : req.getSortNo());
         link.setStatus(req.getStatus() == null ? 1 : req.getStatus());
         link = linkRepository.save(link);
+        // B2 附件引用：先解引用，logoUrl 非空才回写（编辑换图/清空 logo 旧图均回未使用）；幂等
+        attachmentService.release("link", link.getId());
+        if (StringUtils.hasText(req.getLogoUrl())) {
+            attachmentService.markUsed(site.getId(), req.getLogoUrl(), "link", link.getId());
+        }
         eventPublisher.publishEvent(new SiteContentChangedEvent(site.getId(), "link"));
         return LinkVo.of(link);
     }
@@ -79,6 +85,7 @@ public class LinkService {
             throw new BizException(ErrorCode.FORBIDDEN, "无权删除该友链");
         }
         linkRepository.delete(link);
+        attachmentService.release("link", link.getId());
         eventPublisher.publishEvent(new SiteContentChangedEvent(site.getId(), "link"));
     }
 }
diff --git a/src/main/java/com/yunhai/cms/service/impl/SiteService.java b/src/main/java/com/yunhai/cms/service/impl/SiteService.java
index bc8b71f..81efbee 100644
--- a/src/main/java/com/yunhai/cms/service/impl/SiteService.java
+++ b/src/main/java/com/yunhai/cms/service/impl/SiteService.java
@@ -40,6 +40,14 @@ public class SiteService {
     private final ApplicationEventPublisher eventPublisher;
     private final com.yunhai.cms.theme.ThemeRegistry themeRegistry;
 
+    /**
+     * B2 附件引用：站点配置 logo/favicon 回写场景引用。
+     * 字段注入 + @Lazy 打破与 AttachmentService 的构造器循环依赖（AttachmentService → SiteService）。
+     */
+    @org.springframework.beans.factory.annotation.Autowired
+    @org.springframework.context.annotation.Lazy
+    private AttachmentService attachmentService;
+
     /** config_json 已知键约束（与前端 utils/siteConfigForm.ts 保持一致，docs/09 §0 键清单） */
     private static final ObjectMapper CONFIG_MAPPER = new ObjectMapper();
     private static final Pattern HOST_PATTERN = Pattern.compile(
@@ -140,6 +148,8 @@ public class SiteService {
         site.setConfigJson(mergeThemeParams(req, resolvedTheme));
         site.setStatus(req.getStatus() == null ? 1 : req.getStatus());
         site = siteRepository.save(site);
+        // B2 附件引用：config_json 的 logo/favicon 指向上传文件时回写场景引用（换图/清空自动解引用旧值）
+        attachmentService.markSiteConfigUsed(site.getId(), ExtJsonUtils.parse(site.getConfigJson()));
         eventPublisher.publishEvent(new SiteContentChangedEvent(site.getId(), "site"));
         return SiteVo.of(site);
     }
diff --git a/src/main/resources/sql/cms_init.sql b/src/main/resources/sql/cms_init.sql
index 20f5c85..7ad828a 100644
--- a/src/main/resources/sql/cms_init.sql
+++ b/src/main/resources/sql/cms_init.sql
@@ -80,6 +80,8 @@ CREATE TABLE IF NOT EXISTS `cms_attachment` (
     `id`          INT           NOT NULL AUTO_INCREMENT COMMENT '主键',
     `site_id`     INT           NOT NULL                COMMENT '所属站点',
     `article_id`  INT           NULL                    COMMENT '关联文章（编辑器图片保存时回填）',
+    `ref_type`    VARCHAR(16)   NULL                    COMMENT '场景引用类型：banner/link/site（B2）',
+    `ref_id`      INT           NULL                    COMMENT '场景引用对象ID（B2）',
     `file_name`   VARCHAR(255)  NOT NULL                COMMENT '原始文件名',
     `file_path`   VARCHAR(500)  NOT NULL                COMMENT '存储路径（相对 FILE_PATH）',
     `web_url`     VARCHAR(500)  NOT NULL                COMMENT 'Web 访问 URL',
@@ -91,7 +93,8 @@ CREATE TABLE IF NOT EXISTS `cms_attachment` (
     `update_time` DATETIME      NULL,
     PRIMARY KEY (`id`),
     KEY `idx_att_article` (`article_id`),
-    KEY `idx_att_site` (`site_id`)
+    KEY `idx_att_site` (`site_id`),
+    KEY `idx_att_ref` (`ref_type`, `ref_id`)
 ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COMMENT = 'CMS 附件';
 
 -- 5. 轮播/推荐位表（首页 banner、图片新闻位等）
diff --git a/src/test/java/com/yunhai/cms/service/impl/ArticleServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/ArticleServiceIT.java
index 59f7f4c..d5b1bde 100644
--- a/src/test/java/com/yunhai/cms/service/impl/ArticleServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/ArticleServiceIT.java
@@ -225,7 +225,7 @@ class ArticleServiceIT extends CmsIntegrationTestBase {
     }
 
     @Test
-    @DisplayName("删除：文章删除且附件转孤儿（article_id 置空，方案 §9.1 附件管理）")
+    @DisplayName("删除：文章删除且附件转未使用（article_id 置空且无场景引用，方案 §9.1 / B2 语义）")
     void delete_orphansAttachments() {
         Integer id = articleService.save(TestUsers.superAdmin(), saveReq("待删文"));
         CmsAttachment att = new CmsAttachment();
@@ -244,8 +244,10 @@ class ArticleServiceIT extends CmsIntegrationTestBase {
         assertThat(articleRepository.findById(id)).isEmpty();
         // unbindArticle 为 JPQL 批量更新，清一级缓存后回读库值
         entityManager.clear();
-        assertThat(attachmentRepository.findById(att.getId())
-                .orElseThrow(IllegalStateException::new).getArticleId()).isNull();
+        CmsAttachment released = attachmentRepository.findById(att.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(released.getArticleId()).isNull();
+        assertThat(released.getRefType()).as("B2：文章删除后无场景引用 → 未使用").isNull();
     }
 
     @Test
diff --git a/src/test/java/com/yunhai/cms/service/impl/AttachmentServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/AttachmentServiceIT.java
index e40fc4d..751818d 100644
--- a/src/test/java/com/yunhai/cms/service/impl/AttachmentServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/AttachmentServiceIT.java
@@ -89,7 +89,7 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     @DisplayName("上传图片：按 cms/{siteCode}/{yyyyMM}/{uuid32}.ext 落盘并落库，webUrl 拼接")
     void upload_imageStoresUnderSiteMonthDir() {
         AttachmentVo vo = attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null, imageFile("jpg"));
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg"));
         com.yunhai.cms.entity.CmsAttachment entity = attachmentRepository.findById(vo.getId())
                 .orElseThrow(IllegalStateException::new);
 
@@ -111,25 +111,25 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     void upload_whitelistedDocumentTypes() {
         for (String name : new String[]{"通知.pdf", "数据.xlsx", "材料.zip", "讲话.mp4", "说明.txt"}) {
             assertThat(attachmentService.upload(
-                    TestUsers.superAdmin(), siteId, null, file(name, "application/octet-stream"))
+                    TestUsers.superAdmin(), siteId, null, null, file(name, "application/octet-stream"))
                     .getId()).isNotNull();
         }
     }
 
     @Test
-    @DisplayName("附件列表：orphanOnly 过滤孤儿并返回 orphanCount")
+    @DisplayName("附件列表：unusedOnly 过滤未使用并返回 unusedCount（B2 语义：无文章引用且无场景引用）")
     @SuppressWarnings("unchecked")
     void page_orphanFilterAndCount() {
-        attachmentService.upload(TestUsers.superAdmin(), siteId, 1, imageFile("jpg"));
-        attachmentService.upload(TestUsers.superAdmin(), siteId, null, imageFile("png"));
+        attachmentService.upload(TestUsers.superAdmin(), siteId, 1, null, imageFile("jpg"));
+        attachmentService.upload(TestUsers.superAdmin(), siteId, null, null, imageFile("png"));
 
         Map<String, Object> all = attachmentService.page(TestUsers.superAdmin(), siteId, false, 1, 10);
         assertThat(all.get("total")).isEqualTo(2L);
-        assertThat(all.get("orphanCount")).isEqualTo(1L);
+        assertThat(all.get("unusedCount")).isEqualTo(1L);
 
-        Map<String, Object> orphans = attachmentService.page(TestUsers.superAdmin(), siteId, true, 1, 10);
-        assertThat(orphans.get("total")).isEqualTo(1L);
-        List<AttachmentVo> list = (List<AttachmentVo>) orphans.get("list");
+        Map<String, Object> unused = attachmentService.page(TestUsers.superAdmin(), siteId, true, 1, 10);
+        assertThat(unused.get("total")).isEqualTo(1L);
+        List<AttachmentVo> list = (List<AttachmentVo>) unused.get("list");
         assertThat(list).extracting(AttachmentVo::getFileName).containsExactly("图.png");
     }
 
@@ -140,16 +140,16 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     void upload_dangerousExtensionsRejected() {
         for (String name : new String[]{"木马.exe", "脚本.bat", "图.svg"}) {
             assertThatThrownBy(() -> attachmentService.upload(
-                    TestUsers.superAdmin(), siteId, null, file(name, "application/octet-stream")))
+                    TestUsers.superAdmin(), siteId, null, null, file(name, "application/octet-stream")))
                     .isInstanceOf(BizException.class)
                     .hasMessageContaining("不支持的文件类型");
         }
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null, file("noext", "application/octet-stream")))
+                TestUsers.superAdmin(), siteId, null, null, file("noext", "application/octet-stream")))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("不支持的文件类型");
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null, file("伪装.jpg.exe", "image/jpeg")))
+                TestUsers.superAdmin(), siteId, null, null, file("伪装.jpg.exe", "image/jpeg")))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("不支持的文件类型");
     }
@@ -162,21 +162,21 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
         exeBytes[0] = 'M';
         exeBytes[1] = 'Z';
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null,
+                TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "照片.jpg", "image/jpeg", exeBytes)))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("不是有效图片");
 
         // 真实图片字节 + application/octet-stream → Content-Type 校验拒绝
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null,
+                TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "照片.jpg", "application/octet-stream", tinyImage("jpg"))))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("Content-Type");
 
         // 纯文本改名 .png（Content-Type 伪装到位）→ 魔数校验拒绝
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null,
+                TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "文档.png", "image/png",
                         "not-an-image".getBytes(StandardCharsets.UTF_8))))
                 .isInstanceOf(BizException.class)
@@ -184,7 +184,7 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
 
         // webp 后缀但魔数头错误 → 拒绝
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null,
+                TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "动图.webp", "image/webp",
                         "RIFFxxxxGIF8".getBytes(StandardCharsets.UTF_8))))
                 .isInstanceOf(BizException.class)
@@ -196,12 +196,12 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     void upload_realImagesAccepted() {
         for (String format : new String[]{"jpg", "png", "gif", "bmp"}) {
             assertThat(attachmentService.upload(
-                    TestUsers.superAdmin(), siteId, null, imageFile(format)).getId()).isNotNull();
+                    TestUsers.superAdmin(), siteId, null, null, imageFile(format)).getId()).isNotNull();
         }
-        assertThat(attachmentService.upload(TestUsers.superAdmin(), siteId, null,
+        assertThat(attachmentService.upload(TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "动图.webp", "image/webp", webpBytes()))
                 .getId()).isNotNull();
-        assertThat(attachmentService.upload(TestUsers.superAdmin(), siteId, null,
+        assertThat(attachmentService.upload(TestUsers.superAdmin(), siteId, null, null,
                 new MockMultipartFile("file", "图标.ico", "image/x-icon", icoBytes()))
                 .getId()).isNotNull();
     }
@@ -210,19 +210,19 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     @DisplayName("空文件/不存在站点/越权站点上传被拒（异常分支）")
     void upload_invalidInputsRejected() {
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null, new MockMultipartFile(
+                TestUsers.superAdmin(), siteId, null, null, new MockMultipartFile(
                         "file", "空.jpg", "image/jpeg", new byte[0])))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("不能为空");
 
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.superAdmin(), 99999, null, file("a.jpg", "image/jpeg")))
+                TestUsers.superAdmin(), 99999, null, null, file("a.jpg", "image/jpeg")))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("站点不存在");
 
         // 学校2 编辑不能向学校1 站点上传（多租户）
         assertThatThrownBy(() -> attachmentService.upload(
-                TestUsers.schoolUser(2), siteId, null, file("越权.jpg", "image/jpeg")))
+                TestUsers.schoolUser(2), siteId, null, null, file("越权.jpg", "image/jpeg")))
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("无权");
     }
@@ -231,7 +231,7 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
     @DisplayName("删除附件记录：本站成功（物理文件留待运维清理），他站 FORBIDDEN")
     void delete_siteScoped() {
         Integer attId = attachmentService.upload(
-                TestUsers.superAdmin(), siteId, null, imageFile("jpg")).getId();
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg")).getId();
 
         DeleteRequest wrongSite = new DeleteRequest();
         wrongSite.setSiteId(persistSite("demo2", 2, "演示站点二").getId());
@@ -246,4 +246,101 @@ class AttachmentServiceIT extends CmsIntegrationTestBase {
         attachmentService.delete(TestUsers.superAdmin(), del);
         assertThat(attachmentRepository.findById(attId)).isEmpty();
     }
+
+    // ===== B2 附件引用模型（ref_type/ref_id 场景引用，消灭孤儿误报）=====
+
+    @Test
+    @DisplayName("B2: 上传带 scene 落 refType 初步标记（banner/link/site 白名单）")
+    void upload_withScene_marksRefType() {
+        AttachmentVo vo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "banner", imageFile("jpg"));
+        CmsAttachment entity = attachmentRepository.findById(vo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(entity.getRefType()).isEqualTo("banner");
+        assertThat(entity.getRefId()).as("refId 由保存点反查回写，上传时为空").isNull();
+        assertThat(vo.getRefType()).isEqualTo("banner");
+
+        assertThat(attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "link", imageFile("png")).getRefType())
+                .isEqualTo("link");
+    }
+
+    @Test
+    @DisplayName("B2: 上传不带 scene 保持未使用（refType/refId 均空）")
+    void upload_withoutScene_staysUnused() {
+        AttachmentVo vo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg"));
+        CmsAttachment entity = attachmentRepository.findById(vo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(entity.getRefType()).isNull();
+        assertThat(entity.getRefId()).isNull();
+        assertThat(vo.isOrphan()).as("无文章引用且无场景引用 = 未使用").isTrue();
+    }
+
+    @Test
+    @DisplayName("B2: 上传 scene 非白名单值被拒")
+    void upload_invalidSceneRejected() {
+        assertThatThrownBy(() -> attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "hack", imageFile("jpg")))
+                .isInstanceOf(BizException.class)
+                .hasMessageContaining("scene");
+    }
+
+    @Test
+    @DisplayName("B2: markUsed 后附件不再是未使用（不出现在 unusedOnly 列表）")
+    @SuppressWarnings("unchecked")
+    void markUsed_banner_attachmentNotOrphan() {
+        AttachmentVo vo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg"));
+
+        attachmentService.markUsed(siteId, vo.getUrl(), "banner", 1001);
+
+        Map<String, Object> unused = attachmentService.page(TestUsers.superAdmin(), siteId, true, 1, 10);
+        assertThat(unused.get("total")).isEqualTo(0L);
+        assertThat(unused.get("unusedCount")).isEqualTo(0L);
+        CmsAttachment marked = attachmentRepository.findById(vo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(marked.getRefType()).isEqualTo("banner");
+        assertThat(marked.getRefId()).isEqualTo(1001);
+        assertThat(AttachmentVo.of(marked).isOrphan()).isFalse();
+    }
+
+    @Test
+    @DisplayName("B2: release 后附件回到未使用（模拟轮播删除解引用）")
+    @SuppressWarnings("unchecked")
+    void release_bannerDeleted_backToUnused() {
+        AttachmentVo vo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg"));
+        attachmentService.markUsed(siteId, vo.getUrl(), "banner", 1001);
+
+        attachmentService.release("banner", 1001);
+
+        Map<String, Object> afterRelease = attachmentService.page(TestUsers.superAdmin(), siteId, true, 1, 10);
+        assertThat(afterRelease.get("total")).isEqualTo(1L);
+        assertThat(afterRelease.get("unusedCount")).isEqualTo(1L);
+        List<AttachmentVo> list = (List<AttachmentVo>) afterRelease.get("list");
+        assertThat(list).extracting(AttachmentVo::getId).containsExactly(vo.getId());
+    }
+
+    @Test
+    @DisplayName("B2: markUsed/release 幂等（重复调用不报错不重复标记）；外链 URL 静默跳过")
+    void markUsed_idempotent_andForeignUrlSkipped() {
+        AttachmentVo vo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, null, imageFile("jpg"));
+
+        attachmentService.markUsed(siteId, vo.getUrl(), "link", 7);
+        attachmentService.markUsed(siteId, vo.getUrl(), "link", 7);
+        CmsAttachment entity = attachmentRepository.findById(vo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(entity.getRefType()).isEqualTo("link");
+        assertThat(attachmentRepository.count()).isEqualTo(1L);
+
+        // 非 CMS 上传的外链地址：无对应记录，静默跳过不报错
+        attachmentService.markUsed(siteId, "https://cdn.example.com/x.png", "link", 7);
+        attachmentService.release("link", 99999);
+        attachmentService.release("link", 7);
+        attachmentService.release("link", 7);
+        assertThat(attachmentRepository.findById(vo.getId())
+                .orElseThrow(IllegalStateException::new).getRefType()).isNull();
+    }
 }
diff --git a/src/test/java/com/yunhai/cms/service/impl/BannerServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/BannerServiceIT.java
index 5123135..30a7a6a 100644
--- a/src/test/java/com/yunhai/cms/service/impl/BannerServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/BannerServiceIT.java
@@ -210,4 +210,82 @@ class BannerServiceIT extends CmsIntegrationTestBase {
         b.setStatus(1);
         return b;
     }
+
+    // ===== B2 附件引用模型（保存轮播回写 attachment 引用）=====
+
+    @Autowired
+    private AttachmentService attachmentService;
+
+    /** 1x1 真实 png（上传需过魔数校验） */
+    private org.springframework.mock.web.MockMultipartFile pngFile() {
+        java.awt.image.BufferedImage img = new java.awt.image.BufferedImage(1, 1, java.awt.image.BufferedImage.TYPE_INT_RGB);
+        java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
+        try {
+            javax.imageio.ImageIO.write(img, "png", out);
+        } catch (java.io.IOException e) {
+            throw new IllegalStateException(e);
+        }
+        return new org.springframework.mock.web.MockMultipartFile("file", "图.png", "image/png", out.toByteArray());
+    }
+
+    @Test
+    @DisplayName("B2: 保存轮播回写 attachment.ref_type=banner, ref_id=bannerId")
+    void save_writesAttachmentRef() {
+        com.yunhai.cms.model.vo.AttachmentVo img = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "banner", pngFile());
+
+        BannerSaveRequest r = req(3, "https://www.example.com");
+        r.setImageUrl(img.getUrl());
+        BannerVo vo = bannerService.save(TestUsers.superAdmin(), r);
+
+        com.yunhai.cms.entity.CmsAttachment att = attachmentRepository.findById(img.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(att.getRefType()).isEqualTo("banner");
+        assertThat(att.getRefId()).isEqualTo(vo.getId());
+    }
+
+    @Test
+    @DisplayName("B2: 编辑换图旧图解引用、新图标记（旧图回未使用）")
+    void save_editChangeImage_releasesOldMarksNew() {
+        com.yunhai.cms.model.vo.AttachmentVo img1 = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "banner", pngFile());
+        com.yunhai.cms.model.vo.AttachmentVo img2 = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "banner", pngFile());
+
+        BannerSaveRequest r1 = req(3, "https://www.example.com");
+        r1.setImageUrl(img1.getUrl());
+        BannerVo vo = bannerService.save(TestUsers.superAdmin(), r1);
+
+        BannerSaveRequest r2 = req(3, "https://www.example.com");
+        r2.setId(vo.getId());
+        r2.setImageUrl(img2.getUrl());
+        bannerService.save(TestUsers.superAdmin(), r2);
+
+        assertThat(attachmentRepository.findById(img1.getId())
+                .orElseThrow(IllegalStateException::new).getRefType()).as("旧图解引用").isNull();
+        assertThat(attachmentRepository.findById(img2.getId())
+                .orElseThrow(IllegalStateException::new).getRefType()).isEqualTo("banner");
+    }
+
+    @Test
+    @DisplayName("B2: 删除轮播解引用（attachment 回未使用）")
+    void delete_releasesAttachmentRef() {
+        com.yunhai.cms.model.vo.AttachmentVo img = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "banner", pngFile());
+        BannerSaveRequest r = req(3, "https://www.example.com");
+        r.setImageUrl(img.getUrl());
+        BannerVo vo = bannerService.save(TestUsers.superAdmin(), r);
+        assertThat(attachmentRepository.findById(img.getId())
+                .orElseThrow(IllegalStateException::new).getRefId()).isEqualTo(vo.getId());
+
+        DeleteRequest del = new DeleteRequest();
+        del.setSiteId(siteId);
+        del.setId(vo.getId());
+        bannerService.delete(TestUsers.superAdmin(), del);
+
+        com.yunhai.cms.entity.CmsAttachment att = attachmentRepository.findById(img.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(att.getRefType()).isNull();
+        assertThat(att.getRefId()).isNull();
+    }
 }
diff --git a/src/test/java/com/yunhai/cms/service/impl/LinkServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/LinkServiceIT.java
index 430e280..2c0fa94 100644
--- a/src/test/java/com/yunhai/cms/service/impl/LinkServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/LinkServiceIT.java
@@ -136,4 +136,72 @@ class LinkServiceIT extends CmsIntegrationTestBase {
                 .isInstanceOf(BizException.class)
                 .hasMessageContaining("不存在");
     }
+
+    // ===== B2 附件引用模型（友链 logo 引用回写）=====
+
+    @Autowired
+    private AttachmentService attachmentService;
+
+    /** 1x1 真实 png（上传需过魔数校验） */
+    private org.springframework.mock.web.MockMultipartFile pngFile() {
+        java.awt.image.BufferedImage img = new java.awt.image.BufferedImage(1, 1, java.awt.image.BufferedImage.TYPE_INT_RGB);
+        java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
+        try {
+            javax.imageio.ImageIO.write(img, "png", out);
+        } catch (java.io.IOException e) {
+            throw new IllegalStateException(e);
+        }
+        return new org.springframework.mock.web.MockMultipartFile("file", "logo.png", "image/png", out.toByteArray());
+    }
+
+    @Test
+    @DisplayName("B2: 保存友链回写 attachment.ref_type=link, ref_id=linkId；删除解引用")
+    void save_writesAttachmentRef_deleteReleases() {
+        com.yunhai.cms.model.vo.AttachmentVo logo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "link", pngFile());
+
+        LinkSaveRequest r = req("带Logo友链", "https://www.example.com");
+        r.setLogoUrl(logo.getUrl());
+        LinkVo vo = linkService.save(TestUsers.superAdmin(), r);
+
+        com.yunhai.cms.entity.CmsAttachment att = attachmentRepository.findById(logo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(att.getRefType()).isEqualTo("link");
+        assertThat(att.getRefId()).isEqualTo(vo.getId());
+
+        DeleteRequest del = new DeleteRequest();
+        del.setSiteId(siteId);
+        del.setId(vo.getId());
+        linkService.delete(TestUsers.superAdmin(), del);
+
+        com.yunhai.cms.entity.CmsAttachment released = attachmentRepository.findById(logo.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(released.getRefType()).isNull();
+        assertThat(released.getRefId()).isNull();
+    }
+
+    @Test
+    @DisplayName("B2: 友链无 logo 不产生附件引用；logo 清空后引用解除")
+    void save_withoutLogo_noRef() {
+        LinkSaveRequest r = req("纯文字友链", "https://www.example.com");
+        LinkVo vo = linkService.save(TestUsers.superAdmin(), r);
+        assertThat(attachmentRepository.findByRefTypeAndRefId("link", vo.getId())).isEmpty();
+
+        com.yunhai.cms.model.vo.AttachmentVo logo = attachmentService.upload(
+                TestUsers.superAdmin(), siteId, null, "link", pngFile());
+        LinkSaveRequest withLogo = req("先有Logo", "https://www.example.com");
+        withLogo.setId(vo.getId());
+        withLogo.setLogoUrl(logo.getUrl());
+        linkService.save(TestUsers.superAdmin(), withLogo);
+        assertThat(attachmentRepository.findByRefTypeAndRefId("link", vo.getId()))
+                .extracting(com.yunhai.cms.entity.CmsAttachment::getId)
+                .containsExactly(logo.getId());
+
+        // logo 清空（改回纯文字）→ 引用解除
+        LinkSaveRequest clear = req("再去Logo", "https://www.example.com");
+        clear.setId(vo.getId());
+        clear.setLogoUrl("");
+        linkService.save(TestUsers.superAdmin(), clear);
+        assertThat(attachmentRepository.findByRefTypeAndRefId("link", vo.getId())).isEmpty();
+    }
 }
diff --git a/src/test/java/com/yunhai/cms/service/impl/SiteServiceIT.java b/src/test/java/com/yunhai/cms/service/impl/SiteServiceIT.java
index 1c6cfc9..ad39c9e 100644
--- a/src/test/java/com/yunhai/cms/service/impl/SiteServiceIT.java
+++ b/src/test/java/com/yunhai/cms/service/impl/SiteServiceIT.java
@@ -643,4 +643,81 @@ class SiteServiceIT extends CmsIntegrationTestBase {
         SiteVo vo = siteService.save(TestUsers.superAdmin(), req);
         assertThat(vo.getParentSiteId()).isEqualTo(mainBId);
     }
+
+    // ===== B2 附件引用模型（站点配置 logo/favicon 引用回写）=====
+
+    @org.springframework.beans.factory.annotation.Autowired
+    private AttachmentService attachmentService;
+
+    /** 1x1 真实 png（上传需过魔数校验） */
+    private org.springframework.mock.web.MockMultipartFile pngFile(String name) {
+        java.awt.image.BufferedImage img = new java.awt.image.BufferedImage(1, 1, java.awt.image.BufferedImage.TYPE_INT_RGB);
+        java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
+        try {
+            javax.imageio.ImageIO.write(img, "png", out);
+        } catch (java.io.IOException e) {
+            throw new IllegalStateException(e);
+        }
+        return new org.springframework.mock.web.MockMultipartFile("file", name, "image/png", out.toByteArray());
+    }
+
+    @Test
+    @DisplayName("B2: 站点配置 logo/favicon 指向本站上传文件 → ref_type=site, ref_id=siteId")
+    void save_siteLogoConfig_marksAttachmentRef() {
+        // 真实流程：站点已存在 → 本站上传 → 配置粘贴 URL → 保存（webUrl 反查带 siteId 防御）
+        CmsSite site = persistSite("cfgsite9", 1, "配置引用站");
+        com.yunhai.cms.model.vo.AttachmentVo logo = attachmentService.upload(
+                TestUsers.superAdmin(), site.getId(), null, "site", pngFile("logo.png"));
+        com.yunhai.cms.model.vo.AttachmentVo favicon = attachmentService.upload(
+                TestUsers.superAdmin(), site.getId(), null, "site", pngFile("favicon.png"));
+
+        SiteSaveRequest req = baseConfigReq("cfgsite9");
+        req.setId(site.getId());
+        req.setConfigJson("{\"logo\":\"" + logo.getUrl() + "\",\"favicon\":\"" + favicon.getUrl() + "\"}");
+        SiteVo vo = siteService.save(TestUsers.superAdmin(), req);
+
+        com.yunhai.cms.entity.CmsAttachment logoAtt = attachmentRepository.findById(logo.getId())
+                .orElseThrow(IllegalStateException::new);
+        com.yunhai.cms.entity.CmsAttachment favAtt = attachmentRepository.findById(favicon.getId())
+                .orElseThrow(IllegalStateException::new);
+        assertThat(logoAtt.getRefType()).isEqualTo("site");
+        assertThat(logoAtt.getRefId()).isEqualTo(vo.getId());
+        assertThat(favAtt.getRefType()).isEqualTo("site");
+        assertThat(favAtt.getRefId()).isEqualTo(vo.getId());
+    }
+
+    @Test
+    @DisplayName("B2: 站点改 logo 换图 → 旧引用解除、新引用回写；清空 logo → 引用解除")
+    void save_editSiteLogo_releasesOldMarksNew() {
+        CmsSite site = persistSite("cfgsite2", 1, "配置换图站");
+        com.yunhai.cms.model.vo.AttachmentVo img1 = attachmentService.upload(
+                TestUsers.superAdmin(), site.getId(), null, null, pngFile("a.png"));
+        com.yunhai.cms.model.vo.AttachmentVo img2 = attachmentService.upload(
+                TestUsers.superAdmin(), site.getId(), null, null, pngFile("b.png"));
+
+        SiteSaveRequest setLogo = baseConfigReq("cfgsite2");
+        setLogo.setId(site.getId());
+        setLogo.setConfigJson("{\"logo\":\"" + img1.getUrl() + "\"}");
+        SiteVo vo = siteService.save(TestUsers.superAdmin(), setLogo);
+        assertThat(attachmentRepository.findById(img1.getId())
+                .orElseThrow(IllegalStateException::new).getRefId()).isEqualTo(vo.getId());
+
+        // 换图
+        SiteSaveRequest change = baseConfigReq("cfgsite2");
+        change.setId(vo.getId());
+        change.setConfigJson("{\"logo\":\"" + img2.getUrl() + "\"}");
+        siteService.save(TestUsers.superAdmin(), change);
+        assertThat(attachmentRepository.findById(img1.getId())
+                .orElseThrow(IllegalStateException::new).getRefType()).as("旧图解引用").isNull();
+        assertThat(attachmentRepository.findById(img2.getId())
+                .orElseThrow(IllegalStateException::new).getRefId()).isEqualTo(vo.getId());
+
+        // 清空 logo（不再引用任何上传文件）
+        SiteSaveRequest clear = baseConfigReq("cfgsite2");
+        clear.setId(vo.getId());
+        clear.setConfigJson("{}");
+        siteService.save(TestUsers.superAdmin(), clear);
+        assertThat(attachmentRepository.findById(img2.getId())
+                .orElseThrow(IllegalStateException::new).getRefType()).as("清空后引用解除").isNull();
+    }
 }
diff --git a/src/test/resources/schema-cms-test.sql b/src/test/resources/schema-cms-test.sql
index 8cf9a7f..d68d5af 100644
--- a/src/test/resources/schema-cms-test.sql
+++ b/src/test/resources/schema-cms-test.sql
@@ -82,6 +82,8 @@ CREATE TABLE `cms_attachment` (
     `id`          INT           NOT NULL AUTO_INCREMENT COMMENT '主键',
     `site_id`     INT           NOT NULL                COMMENT '所属站点',
     `article_id`  INT           NULL                    COMMENT '关联文章',
+    `ref_type`    VARCHAR(16)   NULL                    COMMENT '场景引用类型：banner/link/site（B2）',
+    `ref_id`      INT           NULL                    COMMENT '场景引用对象ID（B2）',
     `file_name`   VARCHAR(255)  NOT NULL                COMMENT '原始文件名',
     `file_path`   VARCHAR(500)  NOT NULL                COMMENT '存储路径',
     `web_url`     VARCHAR(500)  NOT NULL                COMMENT 'Web 访问 URL',
@@ -93,7 +95,8 @@ CREATE TABLE `cms_attachment` (
     `update_time` DATETIME      NULL,
     PRIMARY KEY (`id`),
     KEY `idx_att_article` (`article_id`),
-    KEY `idx_att_site` (`site_id`)
+    KEY `idx_att_site` (`site_id`),
+    KEY `idx_att_ref` (`ref_type`, `ref_id`)
 ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 COMMENT = 'CMS 附件';
 
 CREATE TABLE `cms_banner` (