curl --request POST \
  --url https://api.planetscale.com/v1/organizations/{organization}/databases/{database}/branches/{branch}/traffic/budgets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "mode": "enforce",
  "capacity": 123,
  "rate": 123,
  "burst": 123,
  "concurrency": 123,
  "rules": [
    "<string>"
  ]
}
'

{
  "id": "<string>",
  "name": "<string>",
  "mode": "enforce",
  "actor": {
    "id": "<string>",
    "display_name": "<string>",
    "avatar_url": "<string>"
  },
  "rules": [
    {
      "id": "<string>",
      "kind": "match",
      "tags": [
        {
          "key_id": "<string>",
          "key": "<string>",
          "value": "<string>",
          "source": "sql"
        }
      ],
      "actor": {
        "id": "<string>",
        "display_name": "<string>",
        "avatar_url": "<string>"
      },
      "syntax_highlighted_sql": "<string>",
      "created_at": "<string>",
      "updated_at": "<string>",
      "fingerprint": "<string>",
      "keyspace": "<string>"
    }
  ],
  "created_at": "<string>",
  "updated_at": "<string>",
  "capacity": 123,
  "rate": 123,
  "burst": 123,
  "concurrency": 123
}