Comment 2 for bug 1861098

This issue appeared during implementation of taskflow jobboard in Octavia [1] - it was workarounded by adding separate initilized method - run migrations before server start (patch set 82) [2][3].
This can be reproduced by running several conductors which stated initialization.

[1] - https://review.opendev.org/#/c/647406
[2] - https://review.opendev.org/#/c/647406/106/octavia/controller/worker/v2/taskflow_jobboard_driver.py@46
[3] - https://review.opendev.org/#/c/647406/106/octavia/db/migration/cli.py@93
[4] - https://review.opendev.org/#/c/647406/106/octavia/controller/queue/v2/consumer.py@51