LO extractor modification - transport to Production?

Our project has gone live in production & setup tables are filled in production system.

In production there is one issue & to solve the issue we need to enhance one LO datasource (appln 08) with custom (zz*) field & put code in CMOD exit.

Now I've following doubts ---

1. Is it necessary to delete setup tables (appln 08) before transporting this enhancement to production?

2. If no, do we require system downtime for re-init?