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SQL

-- Backpack: unequipped gear (max 40 slots per hero).
CREATE TABLE IF NOT EXISTS hero_inventory (
hero_id BIGINT NOT NULL REFERENCES heroes(id) ON DELETE CASCADE,
slot_index SMALLINT NOT NULL CHECK (slot_index >= 0 AND slot_index < 40),
gear_id BIGINT NOT NULL REFERENCES gear(id) ON DELETE CASCADE,
PRIMARY KEY (hero_id, slot_index),
UNIQUE (gear_id)
);
CREATE INDEX IF NOT EXISTS idx_hero_inventory_hero ON hero_inventory(hero_id);