* Refactor: Explicitly add field names to INSERT

This avoids issues when code schema is out of sync with real schema

* Dont write session parameters to events

These would only be stored on first event anyways. Work remains to be done
on tests which have their own helper

* Remove writes to country_code in a test

* Remove old columns from being accessible in elixir code

* Update most tests to use new way of adding session props to events

* Update testing harness

* Update stats controller test

* Update for shield rules

* update breakdown tests

* Fix typing of state for dialyzer

* Drop support for old session attributes code

* Update remaining tests

* cond -> if