cross-border-payment/doc/model/merchant_account_sys.md

###商户系统账户表 merchant_account_out

sys_account_id ：关联系统的银行帐户id

CREATE TABLE `merchant_account_sys` (
   `id` int NOT NULL AUTO_INCREMENT,
   `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
   `updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
   `deleted_at` datetime NOT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
   `merchant_id` int NOT NULL DEFAULT '0' COMMENT '商户ID',
   `sys_account_id` int DEFAULT NULL COMMENT '关联的平台账户的id',
   `account_num` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '银行的账户编号',
   `balance_amount` decimal(10,2) NOT NULL COMMENT '余额',
   `freeze_amount` decimal(10,2) NOT NULL COMMENT '冻结的余额',
   `currency_id` int DEFAULT '0' COMMENT '关联的币种id',
   `capital_prop` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '资金的属性',
   `currency_type` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '币种',
   `remark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '备注',
   PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=67 DEFAULT CHARSET=utf8mb3 ROW_FORMAT=DYNAMIC COMMENT='商户外部账户表';

merchant_id 关联 merchant.id

currency_id 关联 currency.id, currency_type 关联 currency.currency_type