Update Cost Rate Energy Cost
-----------------------------

Update an existing **energy cost interval**.

**Request**

- Method: ``PUT``
- Path: ``/api/dynamic_pricing/cost_rate_energy_cost``

**Body parameters**

Mandatory:

.. list-table::
   :widths: 25 15 60
   :header-rows: 1

   * - Name
     - Type
     - Description
   * - uuid
     - string
     - UUID of the energy cost interval to update.
   * - unit
     - integer
     - Energy unit in Wh (e.g. 1 = per Wh).
   * - price
     - string|float
     - Price per unit.

**Example request**

.. code-block:: bash

    curl --location --request PUT \
    'https://example.beenergised.cloud/api/dynamic_pricing/cost_rate_energy_cost' \
    --header 'x-api-token: <your_token>' \
    --header 'Content-Type: application/json' \
    --data '{
      "uuid": "<INTERVAL_UUID>",
      "unit": 1,
      "price": "0.30"
    }'

**Response (200)**

.. code-block:: json

    {
      "status": "ok",
      "message": "Energy cost was successfully updated.",
      "uuid": "29ccce27-3a3a-4308-831a-ed68b460e3bf"
    }

**Error responses**

- ``404``: Energy cost interval not found.

.. code-block:: json

    {
      "status": "error",
      "message": "Cost rate interval not found"
    }

- ``400``: Duplicate energy cost interval (same unit already exists).

.. code-block:: json

    {
      "status": "error",
      "message": "Energy cost interval already exists"
    }

- ``500``: Generic server error.

.. code-block:: json

    {
      "status": "error",
      "message": "Internal Server Error"
    }