ALTER TABLE vehicle_daily_mileage
  ADD COLUMN pure_hydrogen_mileage_km DECIMAL(18,3) NOT NULL DEFAULT 0 AFTER daily_mileage_km;

ALTER TABLE vehicle_daily_mileage_source
  ADD COLUMN pure_hydrogen_mileage_km DECIMAL(18,3) NOT NULL DEFAULT 0 AFTER daily_mileage_km,
  ADD COLUMN pure_hydrogen_sample_count BIGINT NOT NULL DEFAULT 0 AFTER sample_count,
  ADD COLUMN latest_pure_hydrogen_active TINYINT(1) NOT NULL DEFAULT 0 AFTER latest_event_time,
  ADD COLUMN latest_pure_hydrogen_mode_known TINYINT(1) NOT NULL DEFAULT 0 AFTER latest_pure_hydrogen_active;