datetime,symbol,open,high,low,close,volume,turnover,open_interest
2025-10-09 09:30:00,IM2512,7444.0,7445.2,7443.8,7445.2,406,604503760,-176
2025-10-09 09:45:00,IM2512,7448.0,7497.8,7430.8,7482.6,20461,30561185000,-6689