Now we've found all the issues, the latency spike (4 seconds on my laptop)
for querying 2M elements remains.
Restore the limited sampling which we reverted, but make it 10,000 now.
This doesn't help our worst-case latency, because sql still asks for all 2M entries on
first access. We address that next.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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