Estimate a Provider swap over measured usage

curl -X POST "$VOCAL_API/v1/analytics/what-if" \
  -H "Authorization: Bearer $VOCAL_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{
    "agent_id": "agt_...",
    "substitution": {
      "stage": "stt",
      "current_provider": "mock",
      "substitute_provider": "mock",
      "substitute_model": "<substitute_model>"
    }
  }'

const response = await fetch(`${process.env.VOCAL_API}/v1/analytics/what-if`, {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.VOCAL_API_KEY}`,
    'Idempotency-Key': crypto.randomUUID(),
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "agent_id": "agt_...",
    "substitution": {
      "stage": "stt",
      "current_provider": "mock",
      "substitute_provider": "mock",
      "substitute_model": "<substitute_model>"
    }
  }),
});
console.log(response.status, await response.text());

import os
import uuid

import requests

response = requests.post(
    f"{os.environ['VOCAL_API']}/v1/analytics/what-if",
    headers={
        "Authorization": f"Bearer {os.environ['VOCAL_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "agent_id": "agt_...",
        "substitution": {
            "stage": "stt",
            "current_provider": "mock",
            "substitute_provider": "mock",
            "substitute_model": "<substitute_model>",
        },
    },
)
print(response.status_code, response.text)