diff --git a/backend/migrations/20260609052734_add_amount_cent_fields.sql b/backend/migrations/20260609052734_add_amount_cent_fields.sql
new file mode 100644
index 0000000..09efff2
--- /dev/null
+++ b/backend/migrations/20260609052734_add_amount_cent_fields.sql
@@ -0,0 +1,160 @@
+-- +goose Up
+-- +goose StatementBegin
+-- ============================================
+-- 金额统一重构：新增分字段（BIGINT）
+-- 目标：所有金额存储使用整数分，避免浮点精度问题
+-- 展示：统一到角精度（0.1元）
+-- ============================================
+
+-- 用户表：免押额度
+ALTER TABLE users
+  ADD COLUMN deposit_free_quota_cent BIGINT NOT NULL DEFAULT 0 COMMENT '免押总额度(分)' AFTER deposit_free_quota;
+
+-- 商品表：价格和押金
+ALTER TABLE rental_listings
+  ADD COLUMN price_cent BIGINT NOT NULL DEFAULT 0 COMMENT '租金(分/小时)' AFTER price,
+  ADD COLUMN deposit_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '押金金额(分)' AFTER deposit_amount;
+
+-- 订单表：租金、押金、平台费
+ALTER TABLE rental_orders
+  ADD COLUMN rent_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '租金总额(分)' AFTER rent_amount,
+  ADD COLUMN owner_rent_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '号主实得租金(分)' AFTER owner_rent_amount,
+  ADD COLUMN deposit_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '实际收取押金(分)' AFTER deposit_amount,
+  ADD COLUMN deposit_original_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '商品原始押金(分)' AFTER deposit_original_amount,
+  ADD COLUMN deposit_waived_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '免押抵扣金额(分)' AFTER deposit_waived_amount,
+  ADD COLUMN platform_fee_cent BIGINT NOT NULL DEFAULT 0 COMMENT '平台手续费(分)' AFTER platform_fee;
+
+-- 结算记录表：所有金额字段
+ALTER TABLE order_checkouts
+  ADD COLUMN rent_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '租金(分)' AFTER rent_amount,
+  ADD COLUMN owner_rent_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '号主实得租金(分)' AFTER owner_rent_amount,
+  ADD COLUMN platform_fee_cent BIGINT NOT NULL DEFAULT 0 COMMENT '平台手续费(分)' AFTER platform_fee,
+  ADD COLUMN deposit_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '押金(分)' AFTER deposit_amount,
+  ADD COLUMN consumable_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '消耗品扣费(分)' AFTER consumable_amount,
+  ADD COLUMN other_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '其他费用(分)' AFTER other_amount,
+  ADD COLUMN deposit_deduct_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '押金扣除金额(分)' AFTER deposit_deduct_amount,
+  ADD COLUMN renter_refund_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '租客退款金额(分)' AFTER renter_refund_amount,
+  ADD COLUMN owner_income_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '号主收入金额(分)' AFTER owner_income_amount;
+
+-- 钱包账户表：余额
+ALTER TABLE wallet_accounts
+  ADD COLUMN available_balance_cent BIGINT NOT NULL DEFAULT 0 COMMENT '可用余额(分)' AFTER available_balance,
+  ADD COLUMN frozen_balance_cent BIGINT NOT NULL DEFAULT 0 COMMENT '冻结余额(分)' AFTER frozen_balance;
+
+-- 钱包流水表：金额和余额
+ALTER TABLE wallet_ledger
+  ADD COLUMN amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '金额(分)' AFTER amount,
+  ADD COLUMN balance_after_cent BIGINT NOT NULL DEFAULT 0 COMMENT '变动后余额(分)' AFTER balance_after;
+
+-- 提现表：如果存在的话
+ALTER TABLE withdrawal_requests
+  ADD COLUMN amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '提现金额(分)' AFTER amount,
+  ADD COLUMN fee_cent BIGINT NOT NULL DEFAULT 0 COMMENT '手续费(分)' AFTER fee,
+  ADD COLUMN actual_amount_cent BIGINT NOT NULL DEFAULT 0 COMMENT '实际到账(分)' AFTER actual_amount;
+
+-- ============================================
+-- 数据迁移：从 DECIMAL 复制到 BIGINT（分）
+-- 注意：ROUND(value * 100) 确保精度
+-- ============================================
+
+-- 用户免押额度
+UPDATE users SET deposit_free_quota_cent = ROUND(deposit_free_quota * 100) WHERE deposit_free_quota > 0;
+
+-- 商品价格和押金
+UPDATE rental_listings SET
+  price_cent = ROUND(price * 100),
+  deposit_amount_cent = ROUND(deposit_amount * 100)
+WHERE price > 0 OR deposit_amount > 0;
+
+-- 订单金额
+UPDATE rental_orders SET
+  rent_amount_cent = ROUND(rent_amount * 100),
+  owner_rent_amount_cent = ROUND(owner_rent_amount * 100),
+  deposit_amount_cent = ROUND(deposit_amount * 100),
+  deposit_original_amount_cent = ROUND(deposit_original_amount * 100),
+  deposit_waived_amount_cent = ROUND(deposit_waived_amount * 100),
+  platform_fee_cent = ROUND(platform_fee * 100)
+WHERE rent_amount > 0 OR owner_rent_amount > 0 OR deposit_amount > 0
+   OR deposit_original_amount > 0 OR deposit_waived_amount > 0 OR platform_fee > 0;
+
+-- 结算记录
+UPDATE order_checkouts SET
+  rent_amount_cent = ROUND(rent_amount * 100),
+  owner_rent_amount_cent = ROUND(owner_rent_amount * 100),
+  platform_fee_cent = ROUND(platform_fee * 100),
+  deposit_amount_cent = ROUND(deposit_amount * 100),
+  consumable_amount_cent = ROUND(consumable_amount * 100),
+  other_amount_cent = ROUND(other_amount * 100),
+  deposit_deduct_amount_cent = ROUND(deposit_deduct_amount * 100),
+  renter_refund_amount_cent = ROUND(renter_refund_amount * 100),
+  owner_income_amount_cent = ROUND(owner_income_amount * 100)
+WHERE rent_amount > 0 OR owner_rent_amount > 0 OR platform_fee > 0
+   OR deposit_amount > 0 OR consumable_amount > 0 OR other_amount > 0
+   OR deposit_deduct_amount > 0 OR renter_refund_amount > 0 OR owner_income_amount > 0;
+
+-- 钱包余额
+UPDATE wallet_accounts SET
+  available_balance_cent = ROUND(available_balance * 100),
+  frozen_balance_cent = ROUND(frozen_balance * 100)
+WHERE available_balance > 0 OR frozen_balance > 0;
+
+-- 钱包流水
+UPDATE wallet_ledger SET
+  amount_cent = ROUND(amount * 100),
+  balance_after_cent = ROUND(balance_after * 100)
+WHERE amount != 0 OR balance_after != 0;
+
+-- 提现记录
+UPDATE withdrawal_requests SET
+  amount_cent = ROUND(amount * 100),
+  fee_cent = ROUND(fee * 100),
+  actual_amount_cent = ROUND(actual_amount * 100)
+WHERE amount > 0 OR fee > 0 OR actual_amount > 0;
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+-- ============================================
+-- 回滚：删除所有新增的分字段
+-- ============================================
+
+ALTER TABLE users DROP COLUMN deposit_free_quota_cent;
+
+ALTER TABLE rental_listings
+  DROP COLUMN price_cent,
+  DROP COLUMN deposit_amount_cent;
+
+ALTER TABLE rental_orders
+  DROP COLUMN rent_amount_cent,
+  DROP COLUMN owner_rent_amount_cent,
+  DROP COLUMN deposit_amount_cent,
+  DROP COLUMN deposit_original_amount_cent,
+  DROP COLUMN deposit_waived_amount_cent,
+  DROP COLUMN platform_fee_cent;
+
+ALTER TABLE order_checkouts
+  DROP COLUMN rent_amount_cent,
+  DROP COLUMN owner_rent_amount_cent,
+  DROP COLUMN platform_fee_cent,
+  DROP COLUMN deposit_amount_cent,
+  DROP COLUMN consumable_amount_cent,
+  DROP COLUMN other_amount_cent,
+  DROP COLUMN deposit_deduct_amount_cent,
+  DROP COLUMN renter_refund_amount_cent,
+  DROP COLUMN owner_income_amount_cent;
+
+ALTER TABLE wallet_accounts
+  DROP COLUMN available_balance_cent,
+  DROP COLUMN frozen_balance_cent;
+
+ALTER TABLE wallet_ledger
+  DROP COLUMN amount_cent,
+  DROP COLUMN balance_after_cent;
+
+ALTER TABLE withdrawal_requests
+  DROP COLUMN amount_cent,
+  DROP COLUMN fee_cent,
+  DROP COLUMN actual_amount_cent;
+
+-- +goose StatementEnd