-- Migration 064: Mengeneinheiten am Mapping + source=import erlaubt

ALTER TABLE food_name_mappings
    ADD COLUMN IF NOT EXISTS grams_per_unit NUMERIC(10,3),
    ADD COLUMN IF NOT EXISTS source_unit VARCHAR(20);

ALTER TABLE food_name_mappings DROP CONSTRAINT IF EXISTS food_name_mappings_source_check;

ALTER TABLE food_name_mappings
    ADD CONSTRAINT food_name_mappings_source_check
    CHECK (source IN ('manual', 'bulk', 'admin', 'import'));

COMMENT ON COLUMN food_name_mappings.grams_per_unit IS 'Gramm pro Quell-Einheit (Stück, EL, …); NULL = Masse/Volumen bereits in g';

DO $$
BEGIN
    RAISE NOTICE 'Migration 064: mapping units + source import';
END $$;