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VERIFY_DATA.md

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How to Verify Data at Different Times

Step 1: Check what data exists in Supabase

Visit: http://localhost:3000/api/test-snapshots?limit=10

This will show you:

  • All unique timestamps where data was saved
  • For each timestamp: which sectors exist and their values
  • Sample data for verification

Step 2: Test the actual API endpoint used by the frontend

The frontend uses: /api/snapshots?type=sector&start={startTime}&end={endTime}

Example:

http://localhost:3000/api/snapshots?type=sector&start=2026-01-02T07:10:00.000Z&end=2026-01-02T07:20:00.000Z

Replace the timestamps with actual times from Step 1.

Step 3: Verify in Frontend

  1. Go to the momentum page: http://localhost:3000/momentum
  2. Enable replay mode (move the slider)
  3. Move the slider to different times that you saw in Step 1
  4. Compare the sector data shown with what the API returned

Step 4: Check Browser Console

Open browser DevTools (F12) and check the Console tab for:

  • [SectorPerformance] Fetching historical data for time: ...
  • Any errors or warnings

Expected Behavior

  • When you move the slider to time T, it should:
    1. Query for snapshots in range [T-5min, T+5min]
    2. Find the closest snapshot to time T for each sector
    3. Display those sectors with their values

Troubleshooting

If data is the same at all times:

  1. Check if multiple timestamps have the same data (from test-snapshots API)
  2. Check if the API is returning the same snapshots for different time ranges
  3. Check browser console for any errors
  4. Verify that timestamps are rounded to 5-minute intervals (12:40, 12:45, etc.)