fix & test for get_data() race condition in WindowManager
Revert "fix & test for get_data() race condition in WindowManager"

This reverts commit ee595f72ee12a2c9ed22ea312eeb249acb2ba26e.
Switch order of redis.set() and redis.lpush() in WindowManager.add so that the day for a key is available before the key is added to the window.
Merge branch 'feature/issue-476-window-manager-get-data-race-condition' into develop