-- in_grain flags dimension/date columns that define the display grain: the
-- forecast load is pre-aggregated to the flagged columns instead of shipping raw
-- rows. See pf_spec.md -> Display-grain pre-aggregation.
--
-- Already applied by hand on the original dev database before migrations existed;
-- IF NOT EXISTS keeps replay safe there. New migrations should not need the guard.

ALTER TABLE pf.col_meta ADD COLUMN IF NOT EXISTS in_grain boolean NOT NULL DEFAULT false;