Price:
- with backends lets say 3 B2 machines = 350USD/Month
- UrlFetch Data Sent/Received                         0,15USD/GB

Limit:
- URL Fetch Daily Limit 46,000,000 calls
  this can be a problem...but I see it is possible to request an
increase

Write data parallel in DB: Task Queue with rate every 30second could
be a solution
(check timestamps in cache and write in DB)

RESET counters = empty cache in Backends & reset counter of object in
DB

Backends cache = HashMap with shared counter values
or
counter values without sharding
(just increment value in java hashmap is fast enough)

With backends we don’t need sharding I think....what do you think? Thx.

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