feat(media): 新增缺失转码产物自动补齐

fruitshorts-module-content/src/main/java/com/fruitshorts/content/dal/mapper/DramaEpisodeMapper.java

@@ -4,6 +4,46 @@ package com.fruitshorts.content.dal.mapper;
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.fruitshorts.content.dal.entity.DramaEpisode;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
 
 public interface DramaEpisodeMapper extends BaseMapper<DramaEpisode> {
+
+    /**
+     * 查询需要补转码的分集：有片源但没有可用码率产物，或缺少缩略图轴，且当前没有排队/执行中的任务。
+     *
+     * @param afterId       上一批处理到的分集 ID，用于游标轮转，避免固定前 N 条长期占用名额
+     * @param limit         单批上限
+     * @param requireFrames 是否把"缺缩略图"也视为缺失；关闭雪碧图时传 false
+     */
+    @Select("""
+            <script>
+            SELECT e.id, e.drama_id, e.video_asset_id, e.video_url
+            FROM drama_episode e
+            WHERE e.deleted = 0
+              AND e.id &gt; #{afterId}
+              AND (e.video_asset_id &gt; 0
+                   OR (e.video_url IS NOT NULL AND e.video_url &lt;&gt; ''))
+              AND NOT EXISTS (
+                  SELECT 1 FROM transcode_task t
+                  WHERE t.episode_id = e.id AND t.status IN ('QUEUED', 'RUNNING'))
+              AND (
+                  NOT EXISTS (
+                      SELECT 1 FROM media_rendition r
+                      WHERE r.episode_id = e.id AND r.deleted = 0 AND r.status = 'ready')
+                  <if test="requireFrames">
+                  OR NOT EXISTS (
+                      SELECT 1 FROM media_thumbnail m
+                      WHERE m.episode_id = e.id AND m.deleted = 0)
+                  </if>
+              )
+            ORDER BY e.id ASC
+            LIMIT #{limit}
+            </script>
+            """)
+    List<DramaEpisode> selectTranscodeBackfillCandidates(@Param("afterId") long afterId,
+                                                         @Param("limit") int limit,
+                                                         @Param("requireFrames") boolean requireFrames);
 }