Yeah, as a Rails developer I seriously doubt any of us are full time any of those things. I've met people that actually do full time JavaScript dev and DB admin

Yeah, as a Rails developer I seriously doubt any of us are full time any of those things. I've met people that actually do full time JavaScript dev and DB admin, the knowledge difference between us is staggering. Rails developers need to wear lots of hats to get their jobs done. They need to be "good enough" at each of those. That, in itself, is a difficult enough task. You don't need to go trying to claim they do full time level work for six different jobs.