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from zope.app.publication.zopepublication import ZopePublication
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from zope.component.hooks import getSite, setSite
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from schooltool.app.interfaces import ISchoolToolApplication
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from schooltool.generations.evolve36.evolve import evolveTimetables
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root = context.connection.root().get(ZopePublication.root_name, None)
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# Invalidate connection cache