The GitHub Actions job "Tests" on airflow.git has succeeded.
Run started by GitHub user ashb (triggered by ashb).

Head commit for run:
9981a9fb6880b065001f5122b1715b81077dc8e8 / Ash Berlin-Taylor 
<[email protected]>
Run migrations with with a pool of a connection.

Without this `create_session()` will open a new connection, and that causes 
mysql
to hang waiting to get a "metadata lock on table".

Using the "stock" pool with size=1 and max_overflow=0 doesn't work, that
instead times out if you try to get a new connection from the pool.
SingletonThreadPool instead returns the existing active connection which
is what we want.

Report URL: https://github.com/apache/airflow/actions/runs/3206006143

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