title: can you add a value to a postgresql 11 partition list
body: <p>I want to use list partitioning to partition a large table representing service orders based on the value of the customer id column.   When a new customer is added to the system, I would like to be able to add that customer to the list of values related to an existing partition.  I would think there would be a relatively easy/quick way to do this since no existing rows need be moved. Essentially it seems like changing (maybe by dropping and adding) a constraint on a child table. But I have not been able to find a reference in the documentation to way to accomplish this. I am currently using aws rds with postgresql version 11.5 but could potentially update.</p>