[schema2sql] insert some constraints into the backend BoundaryConstraint, IntervalBoundConstraint and StaticVocabularyConstraint can be implemented in SQL with CHECK constraints. Next steps, not part of this changeset: - migrations - removing no longer necessary pre-insertion work on the python side - translating backend exception due to constraint violation into ValidationError Note: this means that these constraints can no longer be ignored by disabling integrity hooks. Related to #5154406

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Additional services

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===================

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In this chapter, we introduce services crossing the *web -

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repository - administration* organisation of the first parts of the

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CubicWeb book. Those services can be either proper services (like the

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undo functionality) or mere *topical cross-sections* across CubicWeb.

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.. toctree::

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   :maxdepth: 2

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   undo

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