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You definitely can mix the two, and we actually find it a very useful thing so you can have your metadata available to query alongside the time series data. TimescaleDB will only make a table a hypertable if you tell it too, otherwise regular tables should work as you'd expect. And since we appear as a table in the contexts that it matters (JOINs, querying, inserting, etc), you shouldn't have any issues mixing the two.

I do this, and it works just fine - no caveats, it's actually one of the selling points of TimescaleDB.

Yes you can, and I think this is one of the main selling points of TimescaleDB.

it's perfectly fine to use TimescaleDB alongside any regular tables.

It is encouraged! :)