-- Grid + snap settings for the layout system.
--
-- Two independent grids:
--   * gardens.grid_size_cm / snap_to_grid — the garden-scale grid the visual grid
--     is drawn from and (when snap is on) objects snap to when placed/moved/resized.
--     Defaults to 100 cm (1 m), matching the editor's previous fixed grid.
--   * garden_objects.grid_size_cm / snap_to_grid — a per-object grid used inside a
--     plantable bed: when snap is on, plants snap to it. Defaults to 30 cm (~1 ft),
--     a practical bed cell.
--
-- snap defaults to off on both, so existing gardens keep free placement until the
-- owner (garden grid) or an editor (bed grid) opts in.
ALTER TABLE gardens ADD COLUMN grid_size_cm REAL    NOT NULL DEFAULT 100;
ALTER TABLE gardens ADD COLUMN snap_to_grid INTEGER NOT NULL DEFAULT 0 CHECK (snap_to_grid IN (0, 1));

ALTER TABLE garden_objects ADD COLUMN grid_size_cm REAL    NOT NULL DEFAULT 30;
ALTER TABLE garden_objects ADD COLUMN snap_to_grid INTEGER NOT NULL DEFAULT 0 CHECK (snap_to_grid IN (0, 1));