[views/primary] some inner sections should use the `limit` by default to avoid a denial of service (closes #2719110) Today, it is possible to call .related and get a huge unlimited database-dos-inducing resultset that will be nevertheless limited a bit further in pure python in the `autolimited` view. While we cannot completely avoid potential denial of services such as these we mitigate the problem with the default ui settings: if the inner vid is `autolimited`, then the relation result sets is computed using the user-defined limit. This change respects the semantics of the `autolimited` view and shouldn't break anything.

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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')