migrate() short-circuits via 'if (version >= SCHEMA_VERSION) return',
so my prior commit's v48 block (adding tasks.verificationFailureCount)
never executed against existing v47 databases. App startup then failed
with 'no such column: verificationFailureCount' on first task SELECT.
Bumping the constant to 48 lets the migration body run on next init.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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