[Users] When does an AVP get destroyed? What if you delete an non-existent AVP?

[Kanakatti M. Subramanya]

Does the AVP get deleted at the end of a transaction?  At the end of a 
specific dialog?
If the answer is "transaction" (and I think it is), what exactly 
constitutes a transaction?  e.g. when an INVITE is received,is the 
transaction completed when the corresponding "200 OK" is processed (or 
CANCEL)?

Also, if I have 'avp_delete("$destination")', and the AVP '$destination' 
has never been set, is this "bad"?  or a no-op?


The above two are related.  I am using AVPs to move information around 
in my script, and am wondering how much cleanup is necessary (i.e., 
delete every avp i populate, etc., etc.)

cheers
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