Sales Invoice Developer Notes
=============================

Key files
---------

* ``accounting/models.py``
* ``accounting/forms.py``
* ``accounting/views.py``
* ``accounting/sales_taxes.py``
* ``accounting/signals.py``
* ``accounting/urls.py``
* ``templates/accounting/sales_invoice/*.html``

Signal behavior
---------------

When invoice items are added/updated/deleted, ``ItemTransactionModel`` signals
trigger Sales Invoice snapshot recalculation.

Migrations
----------

The sales-invoice flow introduces:

* schema migrations for new sales-invoice and tax models
* a data migration seeding Canada tax presets

Build docs
----------

Use Sphinx via ``uv``:

.. code-block:: bash

   uv run --with sphinx sphinx-build -b html docs docs/_build/html

Open ``docs/_build/html/index.html`` in a browser.