Adds missing bars to the custom symbol history and replaces existing data with the ones from the MqlRates type array.
[in] Custom symbol name.
[in] Array of the MqlRates type history data for M1.
Number of updated bars or -1 in case of an error.
If there is no bar from the rates array in the current custom symbol history, it is added. If such a bar already exists, it is replaced. All other bars in the current price history remain unchanged. The rates array data should be correct regarding OHLC prices, while the bars opening time should correspond to the M1 timeframe.