fix for 
Msg 4864, Level 16, State 1, Line 1430
Bulk load data conversion error (type mismatch or invalid character for the specified codepage) for row 2717, column 2 (open).
from BTC-USD

Action delete row 2717 which had 'null' in all columns, except for date column

Also, BULK INSERT failed for BTC-USD to correctly read volume values when represented in scientific notation (with E in number representation).  Fixed problem by making volume a reaL data type instead of a bigint data type.  Fix was applied to #temp_ohlcv_values and yahoo_finance_ohlcv_values_with_symbol table.