-- 010: Matched trades (trading-service)
CREATE TABLE IF NOT EXISTS trades (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    buy_order_id UUID NOT NULL REFERENCES orders(id),
    sell_order_id UUID NOT NULL REFERENCES orders(id),
    coupon_id UUID NOT NULL REFERENCES coupons(id),
    buyer_id UUID NOT NULL REFERENCES users(id),
    seller_id UUID NOT NULL REFERENCES users(id),
    price NUMERIC(12,2) NOT NULL,
    quantity INTEGER NOT NULL DEFAULT 1,
    buyer_fee NUMERIC(12,4) NOT NULL DEFAULT 0,
    seller_fee NUMERIC(12,4) NOT NULL DEFAULT 0,
    status VARCHAR(20) NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'settled', 'failed')),
    tx_hash VARCHAR(66),
    settled_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_trades_coupon_id ON trades(coupon_id);
CREATE INDEX idx_trades_buyer_id ON trades(buyer_id);
CREATE INDEX idx_trades_seller_id ON trades(seller_id);
CREATE INDEX idx_trades_status ON trades(status);
CREATE INDEX idx_trades_created_at ON trades(created_at DESC);