just follow your hints, it works well n avoid me having an ugliness code 
(for put insert n update callback for every defined tables), but as 
describe later the before callback is still not work after following your 
hints. actually i kinda love the idea to set the is_active into False 
rather than delete the record but till now, doesn't know how to handle it 
(before delete callback when the default auth.signature is used).
e.g.
*models/db_wizard_event_log.py*
for table in db.tables:
if table != 'auth_event':
db[table]._after_insert.append(partial(event_log.after_insert_event, table 
= table) )
db[table]._after_update.append(partial(event_log.after_update_event, table 
= table) )

*modules/event_log.py*
def after_update_event(s, f, table):
table_input = s.select().first()
if table_input.is_active == True:
current.db.auth_event.insert(time_stamp = current.request.now, client_ip = 
current.request.client, 
 user_id = current.auth.user_id, origin = '%s/%s' % 
(current.request.controller, current.request.function), 
 description = 'ID %s updated in table %s' % (table_input.id, table) )
else:
current.db.auth_event.insert(time_stamp = current.request.now, client_ip = 
current.request.client, 
 user_id = current.auth.user_id, origin = '%s/%s' % 
(current.request.controller, current.request.function), 
 description = 'ID %s deleted in table %s' % (table_input.id, table) )

*error*
when click delete icon on sqlform.grid just said (same result when using 
before delete callback on sqlform.grid with auth signature)
An error occured, please reload <https://127.0.0.1/visitor/master/bank> the 
page ×

when tickmark the delete on the edit page of sqlform.grid it return an 
error :
Error snapshot [image: help] 
<https://127.0.0.1/admin/default/ticket/visitor/127.0.0.1.2015-04-08.20-21-42.078930c6-1ed2-48fc-9d44-a4c8b0002e0c#>

<type 'exceptions.AttributeError'>('NoneType' object has no attribute 
'is_active')

best regards,
stifan
>
>

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