Dashboard Specification Prompt

Write a specification for a custom dashboard.

Purpose: [describe]
Users: [role, how often, decisions they make]
Data sources: [databases, tools, APIs]
Update frequency: [real-time / daily / weekly]

For each metric or visualisation:
1. Name and definition
2. How to calculate
3. Data source and field names
4. Visualisation type (number, line, bar, table, heat map)
5. Time dimension (today / last 7 days / MTD / rolling 30)
6. Filters needed
7. Alert threshold

Also specify: layout and which metrics are most prominent.