nadav created AIRFLOW-2227:
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Summary: Allow variable migrations by adding deletion
Key: AIRFLOW-2227
URL: https://issues.apache.org/jira/browse/AIRFLOW-2227
Project: Apache Airflow
Issue Type: Improvement
Components: models
Reporter: nadav
In order to allow using migration (via alembic or customized scripts) one need
the ability to delete variables (delete function).
Another utility function was added to allow retrieval of all the current
variables keys.
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