Avoid null values

Hi,

I’m looking for a way to avoid null values in my DB. I tried with processors.regex and processors.override but with no luck.
Basically, everytime I will have a null value I’ll like to set a default value instead.

Is there a way to do that?

Regards!
Marcelo

Not sure about insertions, but there is the fill(<VALUE>) option when SELECTing from the DB.