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How Datastore write operation is calculated(total number of write)for simple and complex query?

My guess is

  1. 2 + 2 * n(number of indexed property: at least 1, timestamp) + 0
  2. 2 + 2 * n(number of indexed property: at least 1, timestamp) + 1(wrong. 0 is right)
  3. 2 + 2 * n(number of indexed property: at least 2, req_id, timestamp) + 1




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