Since we are the only writer, we don't need one.
Name (time in s) Min Max Mean StdDev Median
sqlite: test_spam_listcommands (before) 2.1193 2.4524 2.2343 0.1341 2.2229
sqlite: test_spam_listcommands (after) 2.0140 2.2349 2.1001 0.0893 2.0644
Postgres: test_spam_listcommands (before) 6.5572 6.8440 6.7067 0.1032 6.6967
Postgres: test_spam_listcommands (after) 4.4237 5.0024 4.6495 0.2278 4.6717
A nice 31% speedup!
Changelog-Changed: Postgres: significant speedup on read-only operations (e.g. 30% on empty SELECTs)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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