My app allows the user to create add'l tables as needed, so when it
comes upgrade time, my users may all have somewhat different sets of
tables.

Tools like IBPump are very useful, but I don't think that it can
duplicate a table scheme.

Are there any management tools that will create source based upon a
db's specific tables and tablenames and then allow for additions and
changes before generating a new db?

Or does this need to be handled by reading system tables and writing
new source based upon that?

Any keywords and direction/resources in helping to expand my vision on
this issue will be greatly appreciated.