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This solves the problem of deleting implicitly child-items, which

depend on each other when deleting an item. When deleting an item, the

deletion of child-items in the content repository happens in an

arbitrary order, which could raise fk constraints. Since the deletion

happens in a transaction, the deferring checking of the constraints

helps, since then the constraint violating item is also already

deleted.

There is no update script necessary, since reload alters the

constraint.

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