altair823 a728434b2e fix(backup): cleanup orphan .tmp on db.backup() failure + concurrency note ...

Code review I1: wrap snapshot's backup+rename in try/catch, unlink
orphan tmp file on failure so the next run does not encounter a
confusing 'existing file is not a database' error from sqlite.

Code review I2: JSDoc note that snapshot() is not safe for concurrent
calls — callers should serialize via runDaily()'s marker.

New unit test injects a fake db whose backup() rejects after a partial
write, asserts no .tmp / .sqlite remains.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-26 02:49:01 +09:00

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