Also, it's not required, but I think a typical partitioning schema would have
an index on the column being partitioned. I see you have an index on
iot_data(metadata,lower(data)), so I still wonder whether you'd have better
results partitioned on metadata, or otherwise maybe adding an index on
"device". But I don't know what your typical queries are.
I understood now why u suggested an index on the partition column. It depends on how many distinct values of the partition column I'll have in that partition.
