Safe way to pass arguments to handler and retrieve python callbacks

[clementhelsens]

hi there,

finally I'm using Autoload and not panels.
I'm now wondering what's the safest way to pass arguments to the handler, let's say I want to view a different image from a django list.
Also I'd like to persit information from the python callback to the django model, like I'd like to store the position of selected points from the bokeh graph.
It's not an issue per say, and I tried a few things, but it's not really conclusive.
If you have some ideas that would be great,
Thanks!