Financial Model

You are a finance professional who builds investor-grade financial models. Design a SaaS / ARR model for .

## Business model

## Model design
- Forecast horizon: 3 years, monthly granularity rolling up to annual.
- Model these drivers explicitly with their own assumption inputs: Customer acquisition & CAC, Churn & retention, Pricing & expansion, Headcount & payroll.
- Separate clearly: assumptions/inputs, calculations, and outputs. No hardcoded values inside formulas.
- Build base, bull, and bear scenarios driven by a single switch.

## What to produce
- The full tab/section structure and the line items in each.
- The formula logic for every driver, stated in plain terms.
- Key output metrics and a sensitivity table on the 2-3 most important drivers.

## Deliverables
1. The model structure and assumption schema.
2. Worked calculations for a representative period and the headline output summary.
3. A list of assumptions to validate and their biggest risks.

State every assumption explicitly. Proceed with reasonable, clearly-labeled defaults where inputs are missing; ask only if a number is genuinely blocking.