pardon, not sure got what you want to achieve
think if you want to count the rows data, should it better to count the 
data first (using compute in table constructor or count it manually before 
insert to the table) before put it on table?
or do the count calculation manually on the fly (on the view side, just 
extract the data n count it manually)

*ref:*
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Table-constructor
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#callbacks-on-record-insert-delete-and-update

best regards,
stifan

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