-- Add GST Treatment and Source of Supply columns to vendors

ALTER TABLE vendors
  ADD COLUMN IF NOT EXISTS gst_treatment VARCHAR(30),
  ADD COLUMN IF NOT EXISTS source_of_supply VARCHAR(100);

COMMENT ON COLUMN vendors.gst_treatment IS 'REGULAR, COMPOSITION, UNREGISTERED, CONSUMER, SEZ, OVERSEAS, DEEMED_EXPORT, OTHER';
COMMENT ON COLUMN vendors.source_of_supply IS 'Indian state or union territory name';