Steps to run this example:
1. Import data/VWAPDATA.csv and data/trade.csv into the dolphindb/server directory, i.e., the server directory under the DolphinDB installation path
2. Import data/dashboard.DC_VWAP_Monitoring.json into the dashboard
3. Run data/data_input.dos and data/data_input_trade.dos to create databases and tables, and import data into the tables
5. Run scripts 01~07 sequentially to build the VWAP order splitting system
6. Run script 08 or Java/Python API code to place parent orders into the subscription stream table
7. Observe the dashboard results; the parent order monitoring shows the placed parent orders;
the child order monitoring shows the entrusted buy orders placed by the splitting system