I am looking for a solution (a function) that evaluates all the tables in the org file/buffer. I should be then simply able to add that to the local value of before-save-hook in org-mode.

Currently, I need to remember to C-u C-c C-c on all the tables before exporting to ensure that the calculated values in all tables are current.

Or am I missing some org variable, setting which should take care of this?