Fix that the weekly backup process (using pgdump) can result in "dangling" db connections, which stay alive forever (show as "active" in session-manager in dbeaver), and prevent schema changes and such until terminated

Fix that the weekly backup process (using pgdump) can result in "dangling" db connections, which stay alive forever (show as "active" in session-manager in dbeaver), and prevent schema changes and such until terminated #297