-- migrate:up
ALTER TABLE mountain_passes ADD COLUMN category TEXT NOT NULL DEFAULT 'unknown' CHECK (category IN ('road', 'track', 'path', 'hiking', 'unknown'));

-- migrate:down
CREATE TABLE mountain_passes_backup (
    id integer primary key,
    osm_id integer unique not null,
    name text,
    elevation integer,
    latitude real not null,
    longitude real not null
);
INSERT INTO mountain_passes_backup (id, osm_id, name, elevation, latitude, longitude)
SELECT id, osm_id, name, elevation, latitude, longitude FROM mountain_passes;
DROP TABLE mountain_passes;
ALTER TABLE mountain_passes_backup RENAME TO mountain_passes;