New to Node, Mongoose & Mongodb - haven't read the source code...

I have a Node application which opens a file, parses the lines into records and saves the records to mongodb. The records are Mongoose model objects, and to save them to mongodb all I do is invoke the save method on them.

So now I'm all worried about the connection that mongoose is managing db = mongoose.connect(url). Do I need to manually close it? If so, when should I close it (since everything is happening async it is hard to say when to close the connection)?

It seems that mongoose doesn't only keep the connection open, but also it keeps my script from terminating. Can I safely close the mongoose connection after I've called save on all my objects? Otherwise given the async nature of the save, it would be difficult to know exactly when shutdown the connection.