CREATE TABLE enchantments (
    id SERIAL PRIMARY KEY,
    name TEXT NOT NULL UNIQUE,
    min_tier SMALLINT NOT NULL,
    max_tier SMALLINT NOT NULL,
    image_url TEXT NOT NULL,
    CONSTRAINT enchantment_tier_range CHECK (
        min_tier BETWEEN 1 AND 5 AND max_tier BETWEEN 1 AND 5 AND min_tier <= max_tier
    )
);

CREATE TABLE enchantment_attributes (
    enchantment_id INTEGER NOT NULL REFERENCES enchantments(id) ON DELETE CASCADE,
    attribute primary_attribute NOT NULL,
    PRIMARY KEY (enchantment_id, attribute)
);