ALTER TABLE rooms
    ADD COLUMN poi_x REAL NOT NULL DEFAULT 0.5,
    ADD COLUMN poi_y REAL NOT NULL DEFAULT 0.5;

-- Add check constraints to ensure values stay between 0 and 1
ALTER TABLE rooms
    ADD CONSTRAINT poi_x_range CHECK (poi_x >= 0 AND poi_x <= 1),
    ADD CONSTRAINT poi_y_range CHECK (poi_y >= 0 AND poi_y <= 1);