-- Migration: 072_locations_parent_relation
-- Created: 2026-01-31
-- Description: Add hierarchical parent relationship to locations

BEGIN;

ALTER TABLE locations_locations
    ADD COLUMN IF NOT EXISTS parent_location_id INTEGER;

ALTER TABLE locations_locations
    ADD CONSTRAINT locations_locations_parent_location_id_fkey
    FOREIGN KEY (parent_location_id)
    REFERENCES locations_locations(id)
    ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_locations_parent_location_id
    ON locations_locations(parent_location_id);

COMMIT;