did you specify a "Table Selection Pattern" in you task to bring in the table partition into your list of selected tables for the task? If not then you need to modify your task and add a pattern to capture you current and future partitions.
Note: each time you add a Postgres partition you must stop and resume your task so your Qlik task becomes aware of the new partition. If you are using Date range partitioning make sure you add the partitions and stop/resume your task in advance of putting data into the new partition.
We are currently in the process of moving all ideations to a new system. In an effort to make this migration easier, we are closing older ideations that did not see a lot of activity (likes/comments). If you are still interested in this enhancement, please open a new ideation so it repopulates as "new" in our system.