TimeScaleDB: ERROR: cannot create a unique index without the column "xy" (used in partitioning) SQL state: IO103

ERROR:  FEHLER:  cannot create a unique index without the column "xy" (used in partitioning)

SQL state: IO103

https://github.com/timescale/timescaledb/issues/536

https://stackoverflow.com/questions/55312365/how-to-convert-a-simple-postgresql-table-to-hypertable-or-timescale-db-table-usi#

The error "cannot create a unique index without the column "xy" (used in partitioning)" normally only occurs if you use one column that is not used within `create_hypertable` as `PRIMARY KEY` or `UNIQUE` column (Or general as constraint). Following https://stackoverflow.com/a/55314991/5536006.