Is it better keep most logic in the database or the Node.js application?

Hi,

I've been wondering this for some time but is it better to keep the vast majority of the logic in the database using
functions,stored procedures, triggers and everything else or should I keep the SQL in the Node.js web application and
usethat to directly query the database object? I would have thought using database functions would be faster as the
databasewill know what the query is ahead of time and can perform some optimisations on it but this is just a guess on
mypart. 

What should I do? Keep everything in the Node.js application or do as much as possible in PostgreSQL?

Simon.