Boekingsvoorstel::postSave
==========================


.. code-block:: json

    {
      "version": "0.1",
      "data": {
        "id": 78,
        "type_id": 3,
        "uitje_id": 4523,
        "contactmoment_id": 1902,
        "wanneer": "2025-08-25",
        "pdf_locatie": "uploads/voorstellen/4523-kanotocht-voorstel.pdf",
        "accepted_timestamp": "2025-08-16T14:30:00+00:00",
        "accepted_metadata": "{}",
        "online_akkoord_geven": true,
        "created_at": "2025-08-15T10:20:00+00:00",
        "updated_at": "2025-08-16T14:30:00+00:00"
      },
      "meta": {}
    }

Explanation:

- **id**: integer.
- **type_id**: integer.
- **uitje_id**: integer.
- **contactmoment_id**: integer|null.
- **wanneer**: non-empty-string|null. ISO 8601 datetime of the proposal.
- **pdf_locatie**: string|null.
- **accepted_timestamp**: non-empty-string|null. ISO 8601 datetime when accepted.
- **accepted_metadata**: string.
- **online_akkoord_geven**: boolean.
- **created_at**: ISO 8601 creation datetime string.
- **updated_at**: ISO 8601 last update datetime string.

Webhook selection: use `Boekingsvoorstel::postInsert` for creations and `Boekingsvoorstel::postUpdate` for updates.