date,benchmark,open,close,prev_close,volume
2024-01-02,CSI300.DEMO,2990,3000,2980,100000000
2024-01-03,CSI300.DEMO,3005,3020,3000,102000000
2024-01-04,CSI300.DEMO,3025,3050,3020,105000000
2024-01-05,CSI300.DEMO,3055,3080,3050,108000000
2024-01-08,CSI300.DEMO,3085,3110,3080,109000000
2024-01-09,CSI300.DEMO,3100,3090,3110,107000000
2024-01-10,CSI300.DEMO,3080,3040,3090,111000000
2024-01-11,CSI300.DEMO,3030,2990,3040,115000000
2024-01-12,CSI300.DEMO,2980,2950,2990,118000000