# Change: Add Capacity Update API

## Why
MED-007: The `Capacity Planning` requirement exists but there is no API to update user capacity. The original design had `PUT /api/users/{id}/capacity` but it was replaced with `GET /api/workload/me`. Managers cannot adjust team members' weekly capacity.

## What Changes
- Add `PUT /api/users/{user_id}/capacity` endpoint
- Add capacity validation logic
- Record capacity changes in audit trail

## Impact
- Affected specs: resource-management
- Affected code:
  - `backend/app/api/users/router.py` (modify)
  - `backend/app/schemas/user.py` (modify)