Fix division by zero in ClinicActivityDataService-created-by-agentic

[asafchen-dig]

Issue Description

An ArithmeticException is occurring in the ClinicActivityDataService when calculating active logs ratio due to a division by zero scenario.

Impact

• Service failures when attempting to calculate ratios for log types with no entries
• Affects endpoints:
  • /api/clinic-activity/active-errors-ratio
  • /api/clinic-activity/active-warning-ratio

Root Cause

The getActiveLogsRatio method performs division without checking for a zero denominator:

public int getActiveLogsRatio(String type) {
    var all = repository.countLogsByType(type);
    var active = repository.countActiveLogsByType(type);
    return active/all;  // Throws ArithmeticException when all == 0
}

Solution

A fix has been implemented in PR #99 that:

1. Adds validation for zero denominator
2. Returns 0 when no logs exist
3. Adds proper error logging
4. Converts ratio to percentage for better readability

Additional Notes

• Added warning logs to help track when this edge case occurs
• Improved method to return percentage instead of raw ratio for better usability

Related PR: #99