In Kepion, cells that have been changed but not posted yet will be marked by a blue triangle on the top left of the cell, as shown below.
At post, these cells are stored in the @Changelist parameter, which can then be used in any on-post SQL Rules.
The @Changelist data type is dynamically defined by the Model that the Form belongs to. The data type follows the naming convention:
You can see that it's very similar to the Writeback table structure in the same Model.
Whenever you want to use cells that have been changed, you can pass the @Changelist as a parameter into the SQL stored procedure.
In the stored procedure, you will define a parameter with the right data type.
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
CREATE PROCEDURE [dbo].[USR_CALC_TRADESPEND]
Then in the stored procedure, instead of reading data from Writeback table, which includes all the Writeback data in that Model, you just need to read data from @Changelist parameter.
FROM @Changelist CL
This will help reduce the calculation scope and thus optimize SQL Rule performance when used correctly.