diff --git a/doc/sql/transport/blade_pre_settlement_advance_uk_20261028.sql b/doc/sql/transport/blade_pre_settlement_advance_uk_20261028.sql
new file mode 100644
index 00000000..e8e6fdae
--- /dev/null
+++ b/doc/sql/transport/blade_pre_settlement_advance_uk_20261028.sql
@@ -0,0 +1,33 @@
+-- 预结算预付记录表：唯一键调整（支持付款申请多选预结算单，每张预结算单各建一条台账）
+-- 原唯一键 uk_pre_settlement_advance_no(tenant_id, advance_no) 与多选预结算单联动建档冲突：
+-- 同一付款申请为多张预结算单建档时 advance_no 相同，第二条插入报 Duplicate entry。
+-- 调整为 uk_pre_settlement_advance_no(tenant_id, pre_settlement_id, advance_no)。
+-- 幂等脚本，可重复执行：旧键存在且不含 pre_settlement_id 才删，目标键不存在才加。
+SELECT IF(
+	EXISTS(SELECT 1 FROM information_schema.statistics
+		WHERE table_schema = DATABASE()
+		  AND table_name = 'blade_pre_settlement_advance'
+		  AND index_name = 'uk_pre_settlement_advance_no')
+	AND NOT EXISTS(SELECT 1 FROM information_schema.statistics
+		WHERE table_schema = DATABASE()
+		  AND table_name = 'blade_pre_settlement_advance'
+		  AND index_name = 'uk_pre_settlement_advance_no'
+		  AND column_name = 'pre_settlement_id'),
+	'ALTER TABLE `blade_pre_settlement_advance` DROP INDEX `uk_pre_settlement_advance_no`',
+	'DO 0'
+) INTO @drop_sql;
+PREPARE stmt FROM @drop_sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+SELECT IF(
+	NOT EXISTS(SELECT 1 FROM information_schema.statistics
+		WHERE table_schema = DATABASE()
+		  AND table_name = 'blade_pre_settlement_advance'
+		  AND index_name = 'uk_pre_settlement_advance_no'),
+	'ALTER TABLE `blade_pre_settlement_advance` ADD UNIQUE KEY `uk_pre_settlement_advance_no` (`tenant_id`, `pre_settlement_id`, `advance_no`) USING BTREE',
+	'DO 0'
+) INTO @add_sql;
+PREPARE stmt FROM @add_sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;