-- Explicit package-level geometry contract used by the Lego builder.
ALTER TABLE material_packages
  ADD COLUMN IF NOT EXISTS geometry_basis VARCHAR(40) NULL AFTER unit,
  ADD COLUMN IF NOT EXISTS geometry_factor DECIMAL(10,3) NULL AFTER geometry_basis,
  ADD COLUMN IF NOT EXISTS default_count DECIMAL(10,3) NULL AFTER geometry_factor,
  ADD COLUMN IF NOT EXISTS default_quantity DECIMAL(10,3) NULL AFTER default_count;

CREATE INDEX IF NOT EXISTS idx_material_packages_geometry_basis
  ON material_packages (geometry_basis);