Metric Definition Specification

Write a metric specification for {{metric}}:

1. Definition & rationale:
   - Plain-language description
   - Why does this metric matter? (business impact)
   - How does it connect to {{north_star}}?

2. Calculation logic:
   - Numerator & denominator
   - Filters (time range, geography, user cohorts)
   - Deduplication rules (per user? per session?)
   - Null handling
   - Formula (SQL pseudocode or plain English)

3. Nuances & gotchas:
   - Is this revenue per user or per transaction?
   - Do we exclude certain user segments (bots, test users)?
   - Timezone handling for daily/weekly metrics
   - Seasonality considerations

4. Validation:
   - Sanity checks (expected range, growth trajectory)
   - How to detect calculation errors?

5. Stakeholder ownership:
   - Who owns this metric?
   - Who is the primary consumer (product, finance, etc.)?
   - How often is it reviewed?

6. Changes & versioning:
   - What has changed about this metric over time?
   - Are there legacy definitions to reconcile?

Format as 1-page wiki or Markdown document.