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Something like Redis instead? [sensorid-timerange] = value. Your key is [sensorid-timerange] to get the values for that sensor and that time range.

No more files. You might be able to avoid per usage pricing just by hosting this on a regular vps.

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We use Redis for buffering for a certain timeperiod, and then we write data for one sensor for that period to S3. However we fill up large Redis clusters pretty fast, so we can only buffer for a shortish period.

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