[adapters] Use an adapter for serializing entities to a bare python structure which may be used for e.g. JSON export or other and allow to have different serializations for each entity types. Closes #6378035

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sync_schema_props_perms('cwuri')

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helper = repo.system_source.dbhelper

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cu = session.cnxset.cu

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helper.set_null_allowed(cu, 'moved_entities', 'extid', 'VARCHAR(256)', False)

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commit()