add better way to identify sgfs

[climu]

Hi,
At the moment we are using the urlto field to check if a sgf is not already in the db.

While this work for automatic kgs games added by check_player, there could be conflict when we upload games manually.

Indeed manual upload sgf urlto field is set to the default 'http://'.

I was thinking using the BL[time] WL[time] that record the exact time (milliseconds) left for a player at a move inside a sgf.

I guess we can assume that if in 2 sgf, both 5 first move have been played at the exact same time, those are same sgf;

So creating a new field 'check_code' that would be a list (or the sum?) of those could work better I think.

[climu]

It's done, but we need to populate db now

[climu]

Hum... apparently there might be a conventional way to deal with that. See here.