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Project History in Aire

Project History shows you a complete timeline of changes to your model. Every time you save, Aire captures what changed, who made the change, and when it happened. You can see old and new values side by side, trace when formulas were updated, and understand how your model evolved over time. History is automatic—you don’t need to turn it on or configure anything. Every edit to a term, block, formula, or structure is tracked as you work.

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What Gets Tracked

Project History captures the changes you make:
  • Values — When you update assumptions or inputs (shows before and after)
  • Formulas — When calculation logic changes (displays old and new formulas)
  • Labels — When you rename terms or blocks
  • Units — Updates to measurement units
  • Sources — Changes to where data came from
  • Tags — Adding or removing organizational tags
  • Structure — Adding or removing terms and blocks
Each entry shows what changed, who changed it, and when. For values and formulas, you see the complete before-and-after comparison.

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Why It Matters

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Understand What Changed

When your model updates, Project History answers:
  • “Who changed the interest rate assumption?”
  • “When did this formula get updated?”
  • “What was the electricity price before it changed?”
No more guessing or asking around—the timeline shows exactly what happened.

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Work Confidently with Teams

When multiple people edit the same model, history creates transparency. You can see what your teammates changed since you last looked, review their work before building on it, and avoid accidentally undoing someone else’s updates.

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Audit and Compliance

For regulated projects or investor reviews, Project History provides a complete audit trail. Every change is timestamped and attributed to a specific user, creating a permanent record of how assumptions evolved.

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Troubleshoot Issues

If outputs suddenly look wrong, trace back through the timeline to see what changed. Maybe someone updated a formula, or a key assumption shifted. History helps you identify when things diverged from expectations.

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How to Use It

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View the Timeline

Open Project History from your project to see a chronological list of saves. Each entry shows:
  • Who made the changes
  • When they saved
  • How many edits were included
Click an entry to see the detailed list of changes in that save.

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See What Changed

The detail view shows every modification in the selected save. Each change displays:
  • What was edited (term name, formula, etc.)
  • The old value
  • The new value
  • Any additional context (like tags or structure changes)
For complex changes like formulas, you see the old and new versions side by side for easy comparison.

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Focus on What Matters

Use filters and search to narrow down the timeline:
  • Filter by change type — Show only value updates, formula changes, or specific edit types
  • Search — Find changes by term name, user, or date
  • Switch scenarios — Each scenario has its own history, so you can track how different assumption sets evolved independently

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Understanding History Entries

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Grouped Changes

If you rename a term, update its value, and add a tag all in the same save, those changes appear as separate entries but stay grouped together under that save. This makes it easy to see all related edits at once.

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Per-Scenario Tracking

Each scenario (like “base case” or “optimistic”) has its own independent history. When you switch scenarios, you see how that specific set of assumptions evolved, not a mixed timeline from all scenarios.

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Privacy and Access

  • Only users with access to a scenario can view its history
  • All changes are attributed to the user who made them
  • History entries are permanent and can’t be modified
This ensures transparency while maintaining data integrity.