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A long-standing oversight in the ORM, the ``__delete__`` method for a many- to-one relationship was non-functional, e.g. for an operation such as ``del a.b``. This is now implemented and is equivalent to setting the attribute to ``None``. Fixes: #4354 Change-Id: I60131a84c007b0bf6f20c5cc5f21a3b96e954046