remove the joins for arrat
remove the joins for arrat

BriocheBerlin/speakerinnen_liste,rubymonsters/speakerinnen_liste,1000miles/speakerinnen_liste,1000miles/speakerinnen_liste,1000miles/speakerinnen_liste,BriocheBerlin/speakerinnen_liste,rubymonsters/speakerinnen_liste,rubymonsters/speakerinnen_liste,BriocheBerlin/speakerinnen_liste