Hi Jeremy. Today I moved our PG production database from 9.6.5 to 10. Using 
pglogical allowed me to upgrade it with minimal downtime.

However, I also had to restart the application itself because of changes to 
the OID of pg extensions such as JSON, array and row_type. Without 
restarting the application it would read JSON columns as text, for example.

We serve PG with Docker and stopping the 9.6 container and restarting the 
PG 10 container so that it listen in the production port is so fast that PG 
would be unreachable for just a second or so. However, restarting the 
applications as well will add another few seconds to the upgrade process, 
which I'd prefer to avoid if possible.

So, I'm trying to understand whether it would be possible for Sequel to 
detect that the OIDs have changed and re-register those extensions. I don't 
actually understand how this part works in client-side tools such as 
Sequel's PG support, so I currently have no suggestions on actual 
improvements to the code base or API.

Do you think it would be feasible to detect such changes and allow us to 
register some proc that would run in such scenario, such as re-registering 
those extensions and models?

Cheers,
Rodrigo.

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