CurrentSpendMicros is the user's spend on their effective group over
the current budget period.
effective_group_idstring uuid
EffectiveGroupID is the group the spend is attributed to, falling back to
the Everyone group when no budget applies. Null only when the user has no
organization membership.
period_endstring date-time
PeriodEnd is the exclusive upper bound of the current budget
period.
period_startstring date-time
PeriodStart is the inclusive lower bound of the current budget
period.