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a/Allura/allura/model/session.py b/Allura/allura/model/session.py
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main_orm_session = ThreadLocalORMSession(main_doc_session)
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main_orm_session = ThreadLocalORMSession(main_doc_session)
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project_orm_session = ThreadLocalORMSession(project_doc_session)
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project_orm_session = ThreadLocalORMSession(project_doc_session)
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artifact_orm_session = ThreadLocalORMSession(
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artifact_orm_session = ThreadLocalORMSession(
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    doc_session=project_doc_session,
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    doc_session=project_doc_session,
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    extensions = [ ArtifactSessionExtension ])
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    extensions = [ ArtifactSessionExtension ])
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repository_orm_session = ThreadLocalORMSession(
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    doc_session=main_doc_session,
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    extensions = [  ])