Capistrano Database Syncronization for Non-Rails applications

When we deploy, we sure need to synchronize files and folders but, sometimes, we have this scenario:

a) We develop a database structure and it goes to production.
b) Later we notice that the structure needs to be changed so we change it locally.
c) We need to update the production structure, however, since it has been on the production side, we need to preserve the data intact.

Can anyone drop an example of a synchronization using Capistrano on a non-rails application - I was unable to find anything about this around the web, if you happen to have some sources, I would glad have a look on any links or docs that may exist as well.

(of course, if I happen to find any, I will post them here, as well, obliviously, the solution for this question).

Thanks in advance,