def patch_signature(name)
      row = @db[:tdp_patch].select(:signature).where(name: name).first
      row.nil? ? nil : row[:signature]
    end
def patch_signature(name)
      row = @db[:tdp_patch].select(:signature).where(name: name).first
      row.nil? ? nil : row[:signature]
    end
Looks up a signature of a patch by its name.