Hello,

You can delete any of these entities if there aren't any Backup or 
Mapreduce jobs on your task queue. 

First use the Datastore Admin to delete all but the following kinds:

_AE_DatastoreAdmin_Operation
_GAE_MR_MapreduceState
_GAE_MR_ShardState
_GAE_MR_TaskPayload

After the delete is finished, you can manually delete entities in these kinds 
via the Datastore Viewer. These kinds are used to keep track of the delete 
process itself, and while many of these entities are removed automatically upon 
successful completion, some are expected to remain.


I hope it helps. Cheers!

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