yes, can, please do with before insert or after insert and please read the 
book on dal chapter in before and after callback sub chapter

ref:
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#before-and-after-callbacks

and for the example you can see in this forum 
https://groups.google.com/forum/#!msg/web2py/M4_5THMHzH0/r9aXH-k8eJQJ

best regards,
stifan

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