Filter out Zeros from customer summary balance report

Problem Statement

The Customer Summary Balance Report currently includes customers whose transactions within the selected reporting period sum to zero. Although these customers may have activity, a net total of zero provides little analytical value and unnecessarily increases the size of the report.

User Story

As an admin,

I want customers whose Sum of Transactions is 0 during the reporting period to be excluded from the Customer Summary Balance Report,

So that the report is more concise and focused on customers with meaningful financial activity.

Definition of Done

1. Customer records with a "Sum of Transactions" equal to 0 for the selected reporting period are excluded from the report

2. Customers with non-zero transaction sums (positive or negative) are included

3. Report output remains accurate and consistent with existing balance calculations