Handle `OperationalError`

[Lordfirespeed]

(psycopg.errors.AdminShutdown) terminating connection due to administrator command
...
File "/var/www/deploy.durhack.com/.venv/lib/python3.13/site-packages/sqlalchemy/engine/default.py", line 942, in do_execute

See https://docs.sqlalchemy.org/en/20/errors.html#error-e3q8

We need to handle OperationalErrors appropriately, e.g. by retrying a few times before sending events to a dead-letters queue