Maintaining table quota2

[Robert Moskowitz]

Does dovecot compute that values for quota2 with each email it updates 
for the user?  Or only an incremental change?

I ask because I am looking at migrating all the user mail from the old 
server to the new and building a new sql database.  All I see is:

dovecot-dict-sql.conf.ext: connect = host=/var/lib/mysql/mysql.sock 
dbname=postfix user=postfix password=$Postfix_Database_Password map { 
pattern = priv/quota/storage table = quota2 username_field = username 
value_field = bytes } map { pattern = priv/quota/messages table = quota2 
username_field = username value_field = messages }


what is actually done with this table?

thanks





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