diff --git a/migrations/000071_refactor_shop_series_allocation_commission.down.sql b/migrations/000071_refactor_shop_series_allocation_commission.down.sql
new file mode 100644
index 0000000..c9ce823
--- /dev/null
+++ b/migrations/000071_refactor_shop_series_allocation_commission.down.sql
@@ -0,0 +1,11 @@
+-- 回滚：删除 commission_tiers_json，不恢复已删除的 3 个死字段（数据不可逆）
+-- 注意：enable_one_time_commission、one_time_commission_trigger、one_time_commission_threshold 三列数据已丢失，无法恢复
+
+ALTER TABLE tb_shop_series_allocation
+    DROP COLUMN IF EXISTS commission_tiers_json;
+
+-- 以下仅恢复列结构，不恢复数据
+ALTER TABLE tb_shop_series_allocation
+    ADD COLUMN IF NOT EXISTS enable_one_time_commission BOOLEAN NOT NULL DEFAULT FALSE,
+    ADD COLUMN IF NOT EXISTS one_time_commission_trigger VARCHAR(50),
+    ADD COLUMN IF NOT EXISTS one_time_commission_threshold BIGINT NOT NULL DEFAULT 0;
diff --git a/migrations/000071_refactor_shop_series_allocation_commission.up.sql b/migrations/000071_refactor_shop_series_allocation_commission.up.sql
new file mode 100644
index 0000000..958b379
--- /dev/null
+++ b/migrations/000071_refactor_shop_series_allocation_commission.up.sql
@@ -0,0 +1,13 @@
+-- 重构代理系列授权佣金字段
+-- 删除 3 个语义重复的死字段（从未被计算引擎读取）
+-- 新增 commission_tiers_json JSONB 字段（梯度模式专属阶梯金额）
+
+ALTER TABLE tb_shop_series_allocation
+    DROP COLUMN IF EXISTS enable_one_time_commission,
+    DROP COLUMN IF EXISTS one_time_commission_trigger,
+    DROP COLUMN IF EXISTS one_time_commission_threshold;
+
+ALTER TABLE tb_shop_series_allocation
+    ADD COLUMN commission_tiers_json JSONB NOT NULL DEFAULT '[]';
+
+COMMENT ON COLUMN tb_shop_series_allocation.commission_tiers_json IS '梯度模式专属阶梯金额列表，格式：[{"threshold":100,"amount":80}]，固定模式为空数组';