Technical Investigations & Troubleshooting

This document consolidates technical investigations, UI verifications, and troubleshooting sessions.

Table of Contents

1. UI Polling Investigation
2. UI Realtime Update Verification
3. Scheduled Backup UI Verification
4. E2E Test Results
5. Common Issues & Solutions
6. Backup Reconciliation: Mixed Missing Operation IDs

UI Polling Investigation

Date: October 2025 Status: ✅ Resolved Impact: Medium

Problem

Users reported that file operations (copy, move, delete) were not showing real-time progress updates in the UI. The progress dialog would show "0%" for extended periods before jumping to "100%".

Investigation

Initial Observations

1. Progress API calls - Verified API was returning correct progress data
2. Polling interval - Default 1-second interval was appropriate
3. State updates - React state was updating correctly
4. Network timing - No significant network delays

Root Cause

The issue was caused by stale closure in the polling interval:

// Problematic code
useEffect(() => {
  const interval = setInterval(() => {
    // This closure captures the initial operationId
    // If operationId changes, the interval still uses the old value
    fetchProgress(operationId);
  }, 1000);

  return () => clearInterval(interval);
}, []); // Empty dependency array!