Rusty Russell fc2fb7cd70 sql: only create sql indices after initial load of data. ...

This makes a big difference for large tables.  Consider 1.6M channelmoves,
which took 82 seconds to populate, now takes 17 seconds:

Before:
	plugin-sql: Time to call listchannelmoves: 10.380341485 seconds
	plugin-sql: Time to refresh channelmoves: 82.311287310 seconds

After:

	plugin-sql: Time to call listchannelmoves: 9.962815480 seconds
	plugin-sql: Time to refresh channelmoves: 15.711549299 seconds
	plugin-sql: Time to refresh + create indices for channelmoves: 17.100151235 seconds

tests/test_coinmoves.py::test_generate_coinmoves (50,000):
	Time (from start to end of l2 node):	27 seconds
	Worst latency:				16.0 seconds

Changelog-Changed: Plugins: `sql` initial load for tables is much faster (e.g 82 to 17 seconds for very large channelmoves table).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2025-11-04 12:47:37 +10:30

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