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Actions
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Actions define what happens when a survey submission is received. Multiple
actions can be enabled at the same time.

Action types
============

store
  Persist the submission in the Survey results store. Stored submissions
  appear in ``@@results`` and are available for exports and detail views.

mail
  Generate exports in the configured formats and send them as attachments.
  Requires ``E-Mail recipient`` and ``Subject``. If no formats are selected,
  the system defaults to PDF.

mail-notification
  Send a notification-only email that links to the submission detail view.
  Uses the notification subject/body templates.

post
  POST the submission to the configured endpoint. The payload contains the
  submission data, the current form JSON, and the survey URL. This action
  is only executed when an endpoint URL is configured.

Execution flow
==============

1. ``@@save-poll`` receives and validates a submission.
2. A submission event is emitted with the payload and metadata.
3. Subscribers execute enabled actions (store, mail, mail-notification, post).
4. The response is returned to the caller.

Notes
=====

- If ``store`` is disabled, submissions still return success but are not
  persisted.
- ``mail`` and ``mail-notification`` are independent and can be combined.
- ``post`` does not block storage or mail; it executes in addition to those
  actions when enabled.