fixed.  Is the way I clean up SMSLog objects ok?  It's different than https://github.com/dimagi/commcare-hq/blob/0a4b5b4f0f476889a7ed6727476f654239e16615/corehq/apps/smsbillables/tests/test_gateway_fees.py#L143 - do tests run in an isolated environment from the rest of the system?