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- Add ``ModelBase.save()`` method which adds model instance loaded from session to transaction.
- Add ``ModelBase.get_by()`` which proxies to ``ModelBase.query.filter_by().first()``.
- Add model attribute ``events``.
- Add support for multiple event decoration.
- Add named events for all supported events.
- Add composite events for ``before_insert_update`` and ``after_insert_update``.