Claude Sonnet 4.6 综合严格题归零

```sql
SELECT 
    p1.id AS first_id,
    p2.id AS second_id,
    p1.user_id,
    p1.merchant_id,
    p1.amount
FROM payments p1
JOIN payments p2 ON 
    p1.user_id = p2.user_id 
    AND p1.merchant_id = p2.merchant_id 
    AND p1.amount = p2.amount
    AND p1.id < p2.id
WHERE 
    p1.status = 'paid' 
    AND p2.status = 'paid'
    AND ABS(EXTRACT(EPOCH FROM (p2.created_at - p1.created_at))) <= 120
ORDER BY first_id, second_id;
```