db: drop constraint that started failing with MariaDB 10.2 / MySQL 5.7 (Issue #324) The constraint was to prevent simple recursive parent references, but it only checked direct parents. We thus have to rely on the high level application maintaining the invariant anyway.

.. _changelog:

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Changelog
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Kallithea project doesn't keep its changelog here.  We refer you to our `Mercurial logs`__.


.. __: https://kallithea-scm.org/repos/kallithea/changelog