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Didn't want to deal with ramifications of statement timeouts in a complex system, the failure mode mentioned (queue filling up) happened on the scale of 6 weeks, so it was very cheap operationally to set this timeout to some high value.

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So, just to make sure I understand correctly: notifications are delivered while the notification queue size is increasing (due to the transaction holding a lock), and it doesn’t become a problem until the queue size reaches its maximum, at which point it causes dropped notifications?

But the queue grows precisely because some notifications aren’t getting delivered, right?

Since it's pub/sub, you just need one misbehaving client that LISTENs in a transaction to have problems, the other clients can still receive and process the NOTIFY event

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