ORDER_ID = 'OrderID'
USER_ID = 'UserID'
ORDER_TS = 'OrderCreatedOn'
USER_SIGN_UP_TS = 'UserSignUpOn'
DELTA_ORDER_PLACED = 'Delta'  # Datetime difference between user signinup up and placing an order
COHORT_PERIOD = 'CohortPeriod'
COHORT_DATE = 'CohortDate(UserSignUp)'