Unless the content is on your pages, then no, it won't be indexed at all. What sort of spam was/is being collected in your database?
After the latest changes by Google there's a lot of sites that went down like that. Lost of those were ones that didn't offer much decent human-focused content and didn't have respecable backlinks. I haven't looked at your site, but if that sounds like something that could be an issue I'd look at that as more of a cause.
If you are not adhering to the webmasters guidelines that Google has, that stands out a sa very big reason that your site will get dropped because there's a lot of sites that are doing things the right way.
If you do real organis search engine marketing, it will always help to a degree, but the latest changes are made to put an end to people buying rankings. Of course they won't ever be able to do that completely, but it's a start. For a site to do well now it needs to grow properly with content, baclklinks and just general user interest.
You won't ever get a reason from Google as to why your traffic has jumped/dropped. If they tell anyone what to do, they'll be revealing the secrets of their search ranking algorythms, and they are not about to do that.