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fix: prevent duplicate Syslog deliveries across pollers - #103
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Claim due queue rows before transmission so concurrent pollers cannot send the same delivery. Requeue abandoned claims with a bounded retry policy, and preserve in-flight audit events during retention. Signed-off-by: Thomas Vincent <thomasvincent@gmail.com>
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Fixes #102
Claim each due Syslog row atomically before transmission, increment its attempt count on claim, and only write delivery results while the row remains claimed. Requeue claims older than ten minutes and dead-letter them once the retry limit is reached. Keep claimed events visible to queue health and retention.
Validation: 128 Pest tests passed (565 assertions) with the socket integration group excluded. Changed-line coverage is 100% (13/13).
The existing socket-backed Syslog integration test did not complete locally: UDP binding failed in the sandbox, and the approved retry hung.