What is the best way to write "delete" functions in a model?

[eluser]Jelmer[/eluser]
I do call them delete() and update(), but a little bit more logical might be delete_by_id($id) and update_by_id($id).

Other functions I name for their function, for example: remove_expired_autologins() which will remove all autologin keys in a login library that are too old.