Breadcrumb helper or breadcrumb mode?

[eluser]Lpeek[/eluser]
Hey! I'm just putting together some code to build breadcrumbs, I'm just wondering, I would have initially thought to create it as a helper, but as it will be interacting with a database should it actually be a model?

Or maybe neither of those are correct and it should actually be a library?

What would you usually do?

Cheers!