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When a atom is reverted it can be useful to retain the result of that 'revert' method being called, so that it can be later analyzed (or used for various purposes) so adjust the storage, and actions to enable it to be stored. Change-Id: I38a9a5f3bf7550e924468bb4a86652cb8beb306c
Please see https://alembic.readthedocs.org/en/latest/index.html for general documentation To create alembic migrations you need to have alembic installed and available in PATH: # pip install alembic $ cd ./taskflow/persistence/backends/sqlalchemy/alembic $ alembic revision -m "migration_description" See Operation Reference https://alembic.readthedocs.org/en/latest/ops.html#ops for a short list of commands