Rusty Russell bfbee055ea db: don't start transactions unless we really need to. ...

We always start a transaction before processing, but there are cases where
we don't need to.  Switch to doing it on-demand.

This doesn't make a big difference for sqlite3, but it can for Postgres because
of the latency: 12% or so.  Every bit helps!

30 runs, min-max(mean+/-stddev):

	Postgres before:  8.842773-9.769030(9.19531+/-0.21)
	Postgres after: 8.007967-8.321856(8.14172+/-0.066)

	sqlite3 before: 7.486042-8.371831(8.15544+/-0.19)
	sqlite3 after: 7.973411-8.576135(8.3025+/-0.12)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2025-11-20 16:30:50 +10:30

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