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')]

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