Append only tables

Hi,

I have a few tables that are append only. Thre are only gets insert
and select queries, never update or delete.

What I see is that every file is still being updated. It's
currently about 500 GB big, and every of that almost 500 files has
been touched the past 24 hours.

I assume that that the free space map is being used, and that it
still finds places where it can insert a row in one of the files.

(auto) vacuum is not happening on the table.

Is there a way I can turn off this behaviour, and that it really
only writes to the last few pages?


Kurt