[issue45452] Support crash tolerance feature for gdbm module

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

Yeah, I agree with gdbm_latest_snapshot(), this API might be too low-level.
But as I am one of the rocksdb user who directly uses rocksdb API for the production platform as caching purposes.
so when I think about my and my team's rocksdb usage, gdbm_failure_atomic() itself can be useful if the user needs snapshots if they need to recover for the special situation.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45452>
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