The `DAG.clear` method in Python Airflow is used to remove all the tasks and task instances associated with a specific DAG (Directed Acyclic Graph) from the database. This method allows users to start fresh with the DAG, removing any existing task instance history and metadata. After calling the `DAG.clear` method, the DAG can be re-run from the beginning without any previous task instances influencing the execution. This method is particularly useful when wanting to clean up the DAG history and start with a clean slate.
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