diff --git a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/EngagementAdminLookup.java b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/EngagementAdminLookup.java
index 411caa4..3e4e97a 100644
--- a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/EngagementAdminLookup.java
+++ b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/EngagementAdminLookup.java
@@ -5,6 +5,8 @@ package com.fruitshorts.admin.service;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.fruitshorts.admin.vo.EngagementQueryReqVO;
+import com.fruitshorts.common.exception.ErrorCode;
+import com.fruitshorts.common.exception.ServiceException;
 import com.fruitshorts.content.dal.entity.Drama;
 import com.fruitshorts.content.dal.mapper.DramaMapper;
 import com.fruitshorts.user.dal.entity.AppUser;
@@ -25,6 +27,12 @@ import java.util.stream.Collectors;
 public class EngagementAdminLookup {
     private static final int DEFAULT_PAGE_SIZE = 10;
     private static final int MAX_PAGE_SIZE = 100;
+    /**
+     * 关键词预检索的 ID 上限：命中过多时 IN 列表会超出数据库参数上限，
+     * 也说明关键词过于宽泛，直接提示使用者补充条件而不是截断结果。
+     */
+    private static final int MAX_LOOKUP_SIZE = 2000;
+    private static final int LOOKUP_PROBE = MAX_LOOKUP_SIZE + 1;
     private final AppUserMapper userMapper;
     private final DramaMapper dramaMapper;
 
@@ -42,9 +50,11 @@ public class EngagementAdminLookup {
             return null;
         }
         String value = keyword.trim();
-        return userMapper.selectList(Wrappers.<AppUser>lambdaQuery().select(AppUser::getId)
-                .and(q -> q.like(AppUser::getUid, value).or().like(AppUser::getNickname, value)))
+        List<Long> ids = userMapper.selectList(Wrappers.<AppUser>lambdaQuery().select(AppUser::getId)
+                .and(q -> q.like(AppUser::getUid, value).or().like(AppUser::getNickname, value))
+                .last("LIMIT " + LOOKUP_PROBE))
                 .stream().map(AppUser::getId).toList();
+        return ensureLookupSize(ids, "uid / 昵称");
     }
 
     /** 按剧名预检索，未传剧名时不限制短剧。 */
@@ -52,8 +62,19 @@ public class EngagementAdminLookup {
         if (!StringUtils.hasText(title)) {
             return null;
         }
-        return dramaMapper.selectList(Wrappers.<Drama>lambdaQuery().select(Drama::getId)
-                .like(Drama::getTitle, title.trim())).stream().map(Drama::getId).toList();
+        List<Long> ids = dramaMapper.selectList(Wrappers.<Drama>lambdaQuery().select(Drama::getId)
+                .like(Drama::getTitle, title.trim())
+                .last("LIMIT " + LOOKUP_PROBE)).stream().map(Drama::getId).toList();
+        return ensureLookupSize(ids, "短剧名称");
+    }
+
+    /** 命中数量超限时给出可操作的提示，避免把整张表拉进 IN 条件。 */
+    private List<Long> ensureLookupSize(List<Long> ids, String field) {
+        if (ids.size() > MAX_LOOKUP_SIZE) {
+            throw new ServiceException(ErrorCode.BAD_REQUEST,
+                    field + "命中超过 " + MAX_LOOKUP_SIZE + " 条，请使用更精确的筛选条件");
+        }
+        return ids;
     }
 
     /** 区分无筛选和有筛选但无匹配。 */
diff --git a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/FavoriteAdminService.java b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/FavoriteAdminService.java
index 3f018c2..484b35c 100644
--- a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/FavoriteAdminService.java
+++ b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/FavoriteAdminService.java
@@ -66,7 +66,6 @@ public class FavoriteAdminService {
         vo.setAnonymous(row.getUserId() == null);
         vo.setDramaId(row.getDramaId());
         vo.setCreatedAt(row.getCreatedAt());
-        vo.setDramaPublished(false);
         if (user != null) {
             vo.setUid(user.getUid());
             vo.setNickname(user.getNickname());
@@ -77,6 +76,8 @@ public class FavoriteAdminService {
             vo.setDramaStatus(drama.getStatus());
             vo.setDramaPublished(ContentStatus.PUBLISHED.getCode().equals(drama.getStatus()));
         }
+        // 短剧读不到（已删除或数据异常）时保持 dramaPublished 为 null，
+        // 与「未发布」区分开，前端只在明确 false 时才展示未发布标记。
         return vo;
     }
 }
diff --git a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/LikeAdminService.java b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/LikeAdminService.java
index 775be47..dc2291d 100644
--- a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/LikeAdminService.java
+++ b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/service/LikeAdminService.java
@@ -18,6 +18,7 @@ import com.fruitshorts.user.dal.entity.AppUser;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -33,6 +34,12 @@ public class LikeAdminService {
     private static final String EPISODE = "EPISODE";
     private static final String COMMENT = "COMMENT";
     private static final int SUMMARY_LENGTH = 30;
+    /**
+     * 点赞目标是多态列（target_type + target_id），按短剧/剧集筛选必须跨表回溯，
+     * 无法用 LambdaQueryWrapper 表达，只能写原生片段。
+     * 维护约定：表名、逻辑删除列与 {@code drama_episode} / {@code content_comment}
+     * 实体上的 @TableName / @TableLogic 保持一致，改表结构时需要同步修改这里。
+     */
     private static final String DRAMA_MATCH =
             "(target_type = 'DRAMA' AND target_id = {0}) OR "
             + "(target_type = 'EPISODE' AND EXISTS (SELECT 1 FROM drama_episode e "
@@ -95,11 +102,11 @@ public class LikeAdminService {
         }
         Map<Long, AppUser> users = lookup.users(rows.stream().map(ContentLike::getUserId).toList());
         Map<Long, ContentComment> comments = comments(targetIds(rows, COMMENT));
-        List<Long> episodeIds = new java.util.ArrayList<>(targetIds(rows, EPISODE));
+        List<Long> episodeIds = new ArrayList<>(targetIds(rows, EPISODE));
         comments.values().stream().map(ContentComment::getEpisodeId).filter(Objects::nonNull)
                 .forEach(episodeIds::add);
         Map<Long, DramaEpisode> episodes = episodes(episodeIds);
-        List<Long> dramaIds = new java.util.ArrayList<>(targetIds(rows, DRAMA));
+        List<Long> dramaIds = new ArrayList<>(targetIds(rows, DRAMA));
         comments.values().stream().map(ContentComment::getDramaId).filter(Objects::nonNull).forEach(dramaIds::add);
         episodes.values().stream().map(DramaEpisode::getDramaId).filter(Objects::nonNull).forEach(dramaIds::add);
         Map<Long, Drama> dramas = lookup.dramas(dramaIds);
diff --git a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/AdminFavoriteVO.java b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/AdminFavoriteVO.java
index 26912e2..e0a72d1 100644
--- a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/AdminFavoriteVO.java
+++ b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/AdminFavoriteVO.java
@@ -18,6 +18,7 @@ public class AdminFavoriteVO {
     private String dramaTitle;
     private String dramaCover;
     private String dramaStatus;
+    /** true=已发布，false=未发布，null=短剧已不存在（不代表未发布）。 */
     private Boolean dramaPublished;
     private LocalDateTime createdAt;
 }
diff --git a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/FavoriteQueryReqVO.java b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/FavoriteQueryReqVO.java
index 41fa0ae..013afe6 100644
--- a/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/FavoriteQueryReqVO.java
+++ b/fruitshorts-admin-api/src/main/java/com/fruitshorts/admin/vo/FavoriteQueryReqVO.java
@@ -2,6 +2,11 @@
 
 package com.fruitshorts.admin.vo;
 
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
 /** 后台收藏分页检索条件。 */
+@Data
+@EqualsAndHashCode(callSuper = true)
 public class FavoriteQueryReqVO extends EngagementQueryReqVO {
 }
diff --git a/fruitshorts-admin-api/src/test/java/com/fruitshorts/admin/service/EngagementAdminServiceTest.java b/fruitshorts-admin-api/src/test/java/com/fruitshorts/admin/service/EngagementAdminServiceTest.java
index e6f61f7..eae9d8a 100644
--- a/fruitshorts-admin-api/src/test/java/com/fruitshorts/admin/service/EngagementAdminServiceTest.java
+++ b/fruitshorts-admin-api/src/test/java/com/fruitshorts/admin/service/EngagementAdminServiceTest.java
@@ -58,7 +58,7 @@ class EngagementAdminServiceTest {
     }
 
     @Test
-    void should_preserve_guest_and_unpublished_drama_when_favorite_has_no_user() {
+    void should_keep_drama_published_unknown_when_drama_missing() {
         EngagementAdminLookup lookup = mock(EngagementAdminLookup.class);
         UserFavoriteMapper mapper = mock(UserFavoriteMapper.class);
         when(lookup.page(any())).thenReturn(new Page<>(1, 10));
@@ -75,7 +75,8 @@ class EngagementAdminServiceTest {
         var result = new FavoriteAdminService(mapper, lookup).page(new FavoriteQueryReqVO());
         assertThat(result.getList().get(0).getAnonymous()).isTrue();
         assertThat(result.getList().get(0).getDeviceId()).isEqualTo("guest-device");
-        assertThat(result.getList().get(0).getDramaPublished()).isFalse();
+        // 短剧已不存在时不能误报成「未发布」
+        assertThat(result.getList().get(0).getDramaPublished()).isNull();
     }
 
     @Test
diff --git a/sql/migrate-k108-engagement-list-index.sql b/sql/migrate-k108-engagement-list-index.sql
new file mode 100644
index 0000000..8d5f962
--- /dev/null
+++ b/sql/migrate-k108-engagement-list-index.sql
@@ -0,0 +1,14 @@
+-- Author: fruit.com.cn
+-- K108 后台收藏/点赞列表按时间倒序的分页索引。
+-- 列表默认 ORDER BY created_at DESC, id DESC，且实体走逻辑删除（deleted = 0），
+-- 原有索引只覆盖 (user_id, created_at) / (device_id, created_at) 前缀，
+-- 不加筛选条件时会退化成全表扫描 + 排序。
+BEGIN;
+
+CREATE INDEX IF NOT EXISTS idx_content_like_created
+  ON content_like (created_at DESC, id DESC) WHERE deleted = 0;
+
+CREATE INDEX IF NOT EXISTS idx_user_favorite_created
+  ON user_favorite (created_at DESC, id DESC) WHERE deleted = 0;
+
+COMMIT;