[server] commit after serializing schema Use separate transactions for schema serialization and postcreate scripts execution, so that the latter can rely on the schema being persistently stored. This matters e.g. if something in a postcreate violates a unique_together constraint, we need the constraint persisted in order to raise a meaningful error. See #4525069.

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from yams.buildobjs import RelationDefinition

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class ARelation(RelationDefinition):

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    subject = 'CWUser'

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    object = 'CWGroup'