{"version":"1.0","type":"rich","title":"Gist 1127799","description":"This example demonstrates an indexing strategy for querying large datasets in Google App Engine, using the `db.Model` classes `CellIndex` and `Cell`. It shows how to retrieve only the keys of `CellIndex` records that match a filter on `ndfi_low`, then access the parent `Cell` entity to get its full stored data, avoiding serialization of all properties. The code uses the App Engine datastore API with `CellIndex.all(keys_only=True).filter()`, and relies on a `BlobStore` for the parent’s data.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-1127799?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}