Thanks, figured it out. You need to use row["product1"]. But the problem remained in another :-( everything works as it should, only the result is not written to the database for some reason :-(
[15877] [2178] [15877] [34338] [2178] [15877] [34338] [2178] [15877] [34338] [2178] [15877] [34338] [2178] [15877] 0.0 3.0 0.0 load1:-3433.8 load2:-214.8 load3:-1587.7