JDBC: gigantic triggerless publication files

I have a new IDM 4.7.2 installation with triggerless JDBC drivers connecting to MS SQL. I just noticed that they have jdbc_<driver instance guid> files sized between 6-12 gigabytes and they keep on growing.

The databases have something like 30 000 lines and it should not create nothing even close to that big and similar installations take just kilobytes in an older installation. Is there anything I can do to this?