Saving a field with every operation in controllers

hi every one i think it is a bad question, but i think that some one
can help me in this, i need to modify a time stamp and probably other
fiels in the user profile, every time a user make an action, i think
that the right place is to add a component to the AppController and
following the inheritance every operation on every controller would
update this field.
It is right, thanks for the attention!

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