So I have stored some data in the app-engine database, with new data
every 5 seconds.

example dataset:

ID - Time - Value
1 - 9/20/2008 16:00:00 - 100
2 - 9/20/2008 16:00:05 - 120
3 - 9/20/2008 16:00:10 - 130
4 - 9/20/2008 16:00:15 - 250
.......
17278 - 9/21/2008 15:59:60 - 200
17279 - 9/21/2008 15:59:55 - 100
17280 - 9/21/2008 16:00:00 - 220

How do I get just 1000 values back that cover the entire recorded
period, so I can put them in a chart? What sort of query should I
construct?  I imagine it's something like, 'give me every 20th value'
-- but how do I express than in a query?

Thanks in advance for your kindness and consideration.

- s
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