[zX41ZdbW]

Looks like a good scenario for ClickHouse.

One option is to just record all the measurements with the corresponding time. Something like a table with:

  sensor_id, time, value

To align and correlate the measurements, simply round down the time to some bucket. Do something like

  SELECT toStartOfMinute(time) AS t, anyIf(value, sensor_id = 'X'), anyIf(value, sensor_id = 'Y')
  FROM measurements
  WHERE sensor_id IN ('X', 'Y')
  GROUP BY t
  ORDER BY t

Yes, I'm interested in, how it will go! [e-mail]

[zX41ZdbW]

Another interesting option for correlation of measurements at uneven intervals is - using ASOF JOIN.