CLI hangs if DB can't connect, unable to CTRL+C

[Kangaroux]

Describe the bug
If the CLI can't connect to the DB because of a firewall or other issue, it never seems to timeout, and you can't stop it with CTRL+C or CTRL+D.

Expected behavior
Include a timeout (5s?) and/or allow CTRL+C to kill the CLI.

To Reproduce
In the DB conn str, set the database host to something like example.com

Versions.

• OS: Alpine (Docker)
• Python: 3.9.9
• Alembic: 1.7.5
• SQLAlchemy: 1.4.29
• Database: Postgres
• DBAPI:

Have a nice day!

[zzzeek]

this is not a SQLAlchemy issue as SQLAlchemy does not intercept the KeyboardInterrupt error. you likely want to consult the issue tracker for the DBAPI you're using (not stated here) and/or consult the Python mailing list.