had you already take a look record versioning?

taken from book :
Record versioning
_enable_record_versioning

It is possible to ask web2py to save every copy of a record when the record 
is individually modified.

so if you combine record versioning, auth signature that have modified date 
field with before and after callback (to compare the archieve table with 
the original one), i think you can get what you want.

best regards,
stifan

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