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Hiccups when closed channels are being forgotten #7962

@michael1011

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@michael1011

When closed channels with lots of updates are being forgotten, the CLN RPC freezes until the deletion is done.

From @rustyrussell:

I strongly suspect it's this:
stmt = db_prepare_v2(w->db, SQL("DELETE FROM channel_htlcs "
"WHERE channel_id=?"));

This is because there's no index for that exact thing, so this causes a sweep of the entire table. Fix is obvious: add another index...

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BoltzPriority::HighShould be addressed as soon as possible due to significant impact, but not an emergency.

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