Re: Wiki mixed with other content
You can use trackers for such tabular content, and the tracker plugins to show/edit them on wiki pages.
If your db exist and must be usable outside tikiwiki, the approach could be similar, have the db in a accesible database, and build a plugin to show the information in a wiki page, and maybe for editing could base in the tracker php programs to build a similar interface but with other kind of input data and maybe restrictions.