Duplicate accounting log entries

[Patric <patrict@bluebottle.com>]

Hi guys,

Hope someone can help, as this has me banging my head on the wall :]

I am getting duplicate updates from my NAS, and Im trying to figure out 
how to prevent them from being written to my accounting logs table.
I unfortunately have absolutely no control over the NAS, so thats not 
even an option.

What I want to do is make the acct_session_id or acct_unique_id fields 
unique, or even make a composite key of them both, but I have found 
entries in my table where the following happens:

This scenario is with DSL accounts:

I have 3 records for 3 different users all with the same 
acct_session_id. 2 of these records have the same acct_unique_id, and 
the 3rd has a different acct_unique_id. Everything else in the records 
is identical.

If I make a composite key combining the session and unique id's I will 
get rid 1 of the 2 records that have the same unique id, but I will 
still be sitting with 2 duplicate entries, each with a different unique id.
I then thought to make the acct_session_id unique, which would solve the 
above scenario, but then I came across another problem.

This scenario deals with dialup accounts:

I have 2 records with the same acct_session_id but they are for 2 
different users. Each record has a different acct_unique_id though. So 
if I make a composite key combining the session and unique id's both 
these records will exist, which is correct as they are for 2 different 
users. If I make only the acct_session_id unique to solve the DSL 
problem above, then one of these records wont be inserted, and an update 
will occur instead, as per the alternate accounting query.

Am I missing something? Is there any other way to do this? I do not know 
why I am getting duplicate acct_session_id's from my NAS, but as I said 
there is no way for me to go that route...

Any help or guidance would REALLY be appreciated!

Thanks
Patrick