About adding unique index lost data - There are delete operation scenarios

Is it possible to solve this scenario?

Add two calculators when there is a delete operation.

1. The deletion times of the original table are recorded in **delete1**

2. The deletion times of the new table are recorded in **delete2**

When cut-over:

1. Count the total number of rows in the original table and record it to **count1**. Get the value of delete1 and calculate: **res1=count1-delete1**
2. Count the total number of rows in the new table and record it to **count2**. Get the value of delete2 and calculate: **res2=count2-delete2**

When res1 is equal to res2, no data will be lost.