Backups opened a second node:sqlite connection against the live fusion.db
and ran PRAGMA wal_checkpoint(TRUNCATE) before copying. A node:sqlite
SIGSEGV mid-checkpoint (the recurring pager_write crash noted in db.ts)
could leave the main DB file extended-but-zeroed, which is exactly the
failure mode that wiped a 1GB fusion.db tonight.
Replace the in-process checkpoint with a plain cp of the main DB plus any
sibling -wal/-shm files. SQLite replays the WAL on first open, so
uncheckpointed pages survive without us ever opening a second connection
against the live database.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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