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    <p>I do not know your expected volumes and exact issues (only did a quick perusal of your question), but you may consider using Json TextProperty storage as part of your plan. Create dictionaries/lists and store them in records by json.dump()ing them to a TextProperty. When the client calls, simply send the TextProperties to the client, and figure everything out on the client side once you JSON.parse() them. We have done some very large array/object processing in JS this way, and it is very fast (particularly indexed arrays). When the user clicks on something, send a transaction back to update their record. Set up some pull or push queue processes to handle your overall product listing updates, major customer rec updates, etc.</p> <p>One downside is higher bandwidth going out of you app, but I think this cost will be minimal given potential processing savings on GAE. If you structure this right, you may be able to use get_by_id() to replace all or most of your planned indices and queries. We have found json.loads() and json.dumps() to be very fast inside the app, but we only use simple dictionary/list structures.This approach will be, though, a big, <em>big</em> quantum measure lower than your planned use of queries. The other potential issue is that very large objects may run into soft memory limits. Be sure that your Json objects are fairly simple+lightweight to avoid this (e.g. do no include product description, sub-objects, etc. in the Json item, just the basics such as product number). HTH, -stevep</p>
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    1. POFinding unique products (never seen before by a user) in a datastore sorted by a dynamically changing value (i.e. product rating)
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    1. COThanks @stevep. Will definitely keep this in mind. Any tips on resolving the issue with not being able to use cursors when sorting a table by a dynamic property? Since the order changes cursors aren't reliable.
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    2. COYou would be working with all the table elements in your object. To operate on the object you would json.loads() it in GAE Python, do your sorts/updates, then json.dumps() it to you TextProperty for client delivery. HTH, steep.
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