[entity,views/json] backout 353bbd17a8b6 (reopens #2559931) Calling .complete() unconditionnally from the json encoder is unsafe since on entity creation validation: * an eid may have been drawn (hence even .has_eid() would not help) while processing form data in the edit controller * a ValidationError may have been raised and the entity-creating transaction rollbacked This leads to a crash on the return path from the validation to the browser, where the json_dumps((status, args, entity)) call will stumble upon the .complete() call which will fail because the entity does not (any more) exist in the database.

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change_attribute_type('CWCache', 'timestamp', 'TZDatetime')

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change_attribute_type('CWUser', 'last_login_time', 'TZDatetime')

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change_attribute_type('CWSource', 'latest_retrieval', 'TZDatetime')

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drop_attribute('CWSource', 'synchronizing')

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add_attribute('CWSource', 'in_synchronization')