Why do I need to preview before applying Data Fix?

The Data Fix engine requires you to preview changes before applying them. This preview-then-apply workflow protects your data from accidental modifications.

Preview step

When you click "Preview Changes", the engine analyzes your meter data without modifying anything. It returns:

• Number of issues detected and how many can be fixed
• Quality score before and after (percentage)
• A secure confirmation token linked to your preview

No readings are touched during preview — it is a read-only analysis.

Apply step

When you click "Apply Fixes", the engine verifies your confirmation token to ensure:

• The fixes match the meter you previewed
• The preview is still recent and valid
• Your account owns the data being modified

Once verified, all corrections are applied in a single database transaction. If anything fails, the entire operation rolls back — no partial changes are made to your data.

Why this matters

• You get to review exactly what will change before anything is modified
• The confirmation token prevents fixes from being applied to the wrong meter
• If your data changed since the preview (e.g., new readings arrived), the engine re-analyzes fresh data before applying
• Stale previews are automatically rejected — if too much time passes, simply click "Preview Changes" again

Typical workflow

1. Select your meter and time period
2. Click "Preview Changes" and review the results
3. If the quality improvement looks right, click "Apply Fixes"
4. The success message confirms the number of fixes applied

Where this happens: Analytics → Data Fix → select meter → Preview Changes → Apply Fixes.