get_branch_rank.py won't work now

As ERP has removed that particular `BASE_URL` used in the script, it won't work now. I wonder if they have completely removed the performance view feature for parents too or is it still hidden somewhere.

Start by inspecting get_branch_rank.py and the BASE_URL it uses, then verify whether ERP still exposes the performance view for parents. A complete fix would require determining the current endpoint or confirming that the feature is unavailable; the issue does not specify a replacement behavior.

Written by the indexing model from the issue text.