Anyone have any thoughts as to ballpark costs to run this? My napkin math on the cosmo-db requirements is failing me (largely because I do not know Azure at all

Anyone have any thoughts as to ballpark costs to run this? My napkin math on the cosmo-db requirements is failing me (largely because I do not know Azure at all). I'm wondering as a hobbyist / tinkerer if a solution like this is "affordable" (I know it's all relative)