[schema] Use TZDatetime for creation_date and modification_date No work has been done for form fields/widgets since creation_date / modification_date are by default not editable through the default UI. One may want to add such feature at some point. Time will be displayed as UTC, let the end-application decide otherwise by customizing the tzdatetime printer if desired. Closes #4848923

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from datetime import datetime

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for rtype in ('cw_support', 'cw_dont_cross', 'cw_may_cross'):

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    drop_relation_type(rtype)

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add_entity_type('CWSourceSchemaConfig')

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if not 'url' in schema['CWSource'].subjrels:

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    add_attribute('CWSource', 'url')

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    add_attribute('CWSource', 'parser')

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    add_attribute('CWSource', 'latest_retrieval')