fix(media): 缩略图唯一索引改为部分索引,避免软删行占用 episode_id 导致登记冲突
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@@ -0,0 +1,7 @@
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-- 缩略图时间轴唯一约束改为部分索引:
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-- media_thumbnail.deleted 为 @TableLogic 逻辑删除,软删行仍占用 episode_id 会导致
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-- ThumbnailRecordService.upsert 的 delete+insert 触发 uk_media_thumbnail_episode 冲突。
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-- 唯一性只约束未删除行(deleted = 0)。
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DROP INDEX IF EXISTS uk_media_thumbnail_episode;
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CREATE UNIQUE INDEX IF NOT EXISTS uk_media_thumbnail_episode
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ON media_thumbnail (episode_id) WHERE deleted = 0;
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