-- Intentionally empty: there is no automatic way to reconstruct the
-- legacy daily rollups from a `task_usage_hourly` snapshot AND restore
-- their bucket_date semantics (one materialised in runtime tz per
-- migration 082, the other in UTC per migration 084) without
-- re-deciding which tz to use. If a deployment truly needs to roll
-- back, the operator should restore from a pre-drop backup; this is
-- not the place to encode that judgement call.