Hello App Engine team and application developers. I'm building an 
application using the newly released Prospective Search feature, and for now 
my experience has been very pleasant.

We're currently limited to a maximum of 1000 subscriptions. However, 
depending on how Google will raise this limit and how this service will be 
priced, I've got a few questions before starting to code. I'd like to know 
what to expect in order to avoid having to change my code once the feature 
is fully released. I'm thinking mostly on efficient ways to build my 
queries, while both thinking about my clients needs and performance issues.

1) What's the maximum size for a query string using Prospective Search ? How 
about performance : would a very long query (ie. with potentially thousands 
of conditions) severely impact performance ?
2) Should we expect a pricing based on number of subscriptions, or based on 
usage per subscription, or maybe based on call to prospective_search.match() 
function ? In other words : can I design my application so it may have 
potentially millions of subscriptions (most of which will pretty much never 
be match()'ed) without fearing to face huge fees once the feature is 
released, or should I have as few subscriptions as possible, each 
subscription with a potentially very long and complicated query ?

Thank you for your time and answers.

-jbmusso

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