-- Persist the roof covering selected in Enhanced Geometry so Smart Package
-- recommendations cannot fall back to an incompatible historical roof type.
ALTER TABLE roof_geometry
  ADD COLUMN IF NOT EXISTS roof_material ENUM('tegl','tagpap','eternit','betontag','staal','andet') NULL
  AFTER roof_type;

CREATE INDEX IF NOT EXISTS idx_roof_geometry_material ON roof_geometry (roof_material);

ALTER TABLE roof_geometry
  ADD UNIQUE INDEX IF NOT EXISTS unique_project (project_id);