如何在不更改历史数据的情况下更新员工费用？

问题描述

我正在为我的公司创建一个时间表系统，它在一分钟就有了一个非常简单的布局。

我将工作人员的收费率乘以他们工作的时间。

每隔一段时间，工作人员就会得到一个提高他们的收费率的工资。

我想保留员工已经在项目上花费的计算值，并希望收费率从他们的费率增加之日起改变。

我怎么样？能够做到这一点？

I am creating a timesheet system for my company and its got a pretty simple layout at the minute.
I am multiplying the staff charge out rate to the hours they have worked on a job.
Every now and then staff gets a payrise which increases their charge out rate.
I want to keep the calculated values that staff has spent on the project already and want the charge out rate to change as from the date their rate increased.
How would I be able to do this?

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