diff --git a/migrations/000258_allow_zero_refund_attempt_amount.down.sql b/migrations/000258_allow_zero_refund_attempt_amount.down.sql
new file mode 100644
index 00000000..34a2518c
--- /dev/null
+++ b/migrations/000258_allow_zero_refund_attempt_amount.down.sql
@@ -0,0 +1,4 @@
+-- 恢复为 refund_amount > 0。已存在 0 元审批尝试时不校验存量（NOT VALID），只约束之后写入的数据。
+ALTER TABLE tb_refund_request_attempt DROP CONSTRAINT IF EXISTS chk_refund_request_attempt_amount;
+ALTER TABLE tb_refund_request_attempt
+    ADD CONSTRAINT chk_refund_request_attempt_amount CHECK (refund_amount > 0 AND frozen_actual_received_amount >= 0) NOT VALID;
diff --git a/migrations/000258_allow_zero_refund_attempt_amount.up.sql b/migrations/000258_allow_zero_refund_attempt_amount.up.sql
new file mode 100644
index 00000000..d85f1086
--- /dev/null
+++ b/migrations/000258_allow_zero_refund_attempt_amount.up.sql
@@ -0,0 +1,6 @@
+-- 允许 0 元退款的审批尝试金额（restore-zero-amount-refund）。
+-- 背景：000218 建表时约束为 refund_amount > 0，0 元退款（仅作废权益不退钱）提交审批时报 SQLSTATE 23514；
+-- 生产库已人工放宽为 >= 0 但没有迁移记录，测试库与新建库仍为 > 0。本迁移把约束统一为 >= 0，生产执行后结果不变。
+ALTER TABLE tb_refund_request_attempt DROP CONSTRAINT IF EXISTS chk_refund_request_attempt_amount;
+ALTER TABLE tb_refund_request_attempt
+    ADD CONSTRAINT chk_refund_request_attempt_amount CHECK (refund_amount >= 0 AND frozen_actual_received_amount >= 0);