CREATE TABLE IF NOT EXISTS listing_towns (
    id SERIAL PRIMARY KEY,
    listing_id INTEGER NOT NULL REFERENCES listings(id) ON DELETE CASCADE,
    town VARCHAR(100) NOT NULL,
    UNIQUE(listing_id, town)
);

CREATE TABLE IF NOT EXISTS service_listing_towns (
    id SERIAL PRIMARY KEY,
    service_listing_id INTEGER NOT NULL REFERENCES service_listings(id) ON DELETE CASCADE,
    town VARCHAR(100) NOT NULL,
    UNIQUE(service_listing_id, town)
);