why radacctid is the primary key of radacct table instead of acctuniqueid ?

[Santiago Balaguer García]

After solving the problem of duplicate registers in radacct, see   
https://list.xs4all.nl/pipermail/freeradius-users/2006-August/056246.html

I have this doubt:
  why radacctid is the primary key of radacct table instead of acctuniqueid 
?
This is a way to avoid this problem and the DBMS  equally works.

   Santiago

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