[mohon]

Yes, we've done some benchmarks using Clickhouse with the same design that you just mentioned (1 single table that contains all relevant dimensions and metrics)

In our benchmark, we tried aggregating around 1 billion rows of raw data (2 months data) using count exact distinct -> could achieve around 50-60 seconds. If we use the HLL, the query can be finished around 20-30 seconds.

For the retention part, we're planning to keep it 1 year of data, so around 6 billion rows.