you should consider storing an agent's max id in another table. ( the following is MS-SQL compliant.. your flavor may require something slightly different )
you can quickly create this table like so:
select agent,max(id)
into agent_id
from tracker group by agent
and then, before running your insert, run a transactioned query to get and set the max id of an agent
begin tran
set nocount on
update agent_id
set ID = ID + 1 where Name = 'abc'
select ID from agent_id where Name = 'abc'
commit tran
this should ensure you have no ID collissions
HTH!
Update: I just read the auto-incremental part of your post... which pretty much squashes this reply. shame on me.
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