Jan Dvorak

We have only search filtering. Column filtering is not user friendly when all the values are just _string_. Also sorting is not really applicable. Our product is basically SQL editor,...

 These were used for the file types, I can imagine similar style... Or what about some kind of subheaders? I would rather have taller header row than forcing users...

Looks good :) Do we want to have the blue focus?

That's just my opinion, but the red/blue contrast is a bit weird to my eyes.