Refactor get_accessible_filepath_ids

[josenavas]

[squirrelo]

Can you add more detail to this? I feel liek it's going to get lost in the pile of issues since it's super vague.

[antgonza]

Is this related to: #601?

[antgonza]

@josenavas could you add a list of what's needed? Thanks!

[josenavas]

The function get_accessible_filepath_ids is quite expensive and there is probably a better way of doing the work in there.