A few entities disappeared for no apparent reason

[Scott]

At 5:31PM PST last Saturday, August 25th, our app, write-way, started generating a bunch of errors as the system stopped being able to find a handful of our most commonly accessed entities. These sorts of entities are never deleted, and I checked through the code (though I can't guarantee there isn't some bug in the code) and couldn't find any instances of these entities being deleted. Also these entities have been used for going on four years now and we've never seen this happen before. Luckily we were able to restore most the data that was missing, but since then there have no more such losses, and we still can't find a reason for this data going missing, and we're worried now that some other entities that are less visible are also gone.

Are there any instances of entities just going missing? There's no particular connection between the seven of them that we were able to identify were missing, except that they seem to have gone at about the same exact time, and we can pinpoint that time. And it was only a handful as far as we know. We'll keep looking for a reason, tighten up our security, and work on having better backup systems, but basically was wondering if there's anything Google-side that might help explain this, or if anyone else has experienced something like this.

If it's any help, here are the keys:

[datastore_types.Key.from_path(u'VocabListInfo', 47892865, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 37347661, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 108027294, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 47828570, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 99447023, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 47846448, _app=u's~write-way'),
 datastore_types.Key.from_path(u'VocabListInfo', 89472006, _app=u's~write-way')]

[Takashi Matsuo]

Hi Scott,

Are you accessing those entities by getting by keys, or by queries?

-- Takashi

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Takashi Matsuo | Developers Advocate | tma...@google.com