Switch synchronous from NORMAL to FULL and restore the default
wal_autocheckpoint of 1000 (was 100). The aggressive checkpoint
cadence + NORMAL fsync left a wide window for torn pages whenever
a writer crashed mid-checkpoint, which is exactly what happened
when node:sqlite SIGSEGV'd inside pager_write and corrupted the
production db.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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