WeeWx version: 4.10.2
DB: SQLite3

What is the best method for recalculating an item in the entire database?  
Specifically, I want to do this:

signal4 = 1.0 if outTemp < 10.0 else 0.0

So I want the DB update method to look at each record and if the 
temperature (in that record) is less than 10.0 C then set the signal4 value 
in that record to 1.0, otherwise, set the signal4 value to 0.0.

Do I use wee_database --calc missing?
or some other method?

There are currently 575,000 records in the database so I really don't want 
to mess this up.  I assume I need to stop WeeWx while doing this?

Craig

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