According to performance test, the ISA upload endpoint is broken. Please see the following error message:
It seems like code is incorrectly read from the file. Moreover, our ISA upload does not work correctly. Instead of updating values, it always creates new ones. The whole custom SQL retrieve query has some problem and even after fixing all of the above, the code throws exception on ISA update.
check why endpoint is broken
fix the problem
make sure that ISA amount update works correctly
make sure that ISA create works correctly
add contract test that will verify upload works correctly