From 5d139783c9338abff643add3bfe4755d9491a7c9 Mon Sep 17 00:00:00 2001
From: Zhou Weidong <502333560@qq.com>
Date: Tue, 27 Oct 2026 21:07:10 +0800
Subject: [PATCH] =?UTF-8?q?fix(media):=20=E7=BC=A9=E7=95=A5=E5=9B=BE?=
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 =?UTF-8?q?=E5=88=A0=E8=A1=8C=E5=8D=A0=E7=94=A8=20episode=5Fid=20=E5=AF=BC?=
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---
 sql/migrate-k114-thumbnail-partial-index.sql | 7 +++++++
 sql/schema-phase1.sql                        | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 sql/migrate-k114-thumbnail-partial-index.sql

diff --git a/sql/migrate-k114-thumbnail-partial-index.sql b/sql/migrate-k114-thumbnail-partial-index.sql
new file mode 100644
index 0000000..c9faccc
--- /dev/null
+++ b/sql/migrate-k114-thumbnail-partial-index.sql
@@ -0,0 +1,7 @@
+-- 缩略图时间轴唯一约束改为部分索引：
+-- media_thumbnail.deleted 为 @TableLogic 逻辑删除，软删行仍占用 episode_id 会导致
+-- ThumbnailRecordService.upsert 的 delete+insert 触发 uk_media_thumbnail_episode 冲突。
+-- 唯一性只约束未删除行（deleted = 0）。
+DROP INDEX IF EXISTS uk_media_thumbnail_episode;
+CREATE UNIQUE INDEX IF NOT EXISTS uk_media_thumbnail_episode
+  ON media_thumbnail (episode_id) WHERE deleted = 0;
diff --git a/sql/schema-phase1.sql b/sql/schema-phase1.sql
index c41f4fd..caac683 100644
--- a/sql/schema-phase1.sql
+++ b/sql/schema-phase1.sql
@@ -806,7 +806,7 @@ CREATE TABLE IF NOT EXISTS media_thumbnail (
   deleted        SMALLINT     NOT NULL DEFAULT 0
 );
 CREATE UNIQUE INDEX IF NOT EXISTS uk_media_thumbnail_episode
-  ON media_thumbnail (episode_id);
+  ON media_thumbnail (episode_id) WHERE deleted = 0;
 CREATE INDEX IF NOT EXISTS idx_media_thumbnail_drama
   ON media_thumbnail (drama_id);
 COMMENT ON TABLE media_thumbnail IS '单集缩略图雪碧图与 VTT 时间轴';