Option 'page cache size' && 'dbengine multihost disk space' is not used #21038

Question summary

In an attempt to make netdata keep metrics for a longer time I decided to set the memory mode to 'dbengine' and the 'page cache size' and 'dbengine disk space' options to 32 and 256 respectively. I restarted netdata and came back a while later only to find that the retention period seemed unchanged. I then downloaded the config file from http://localhost:19999/netdata.conf and this was the first part of the result

[global]
update every = 2
memory deduplication (ksm) = no
debug log = syslog
error log = syslog
access log = none
run as user = root
memory mode = dbengine

# option 'page cache size' is not used.
page cache size = 32

# option 'dbengine multihost disk space' is not used.
dbengine multihost disk space = 256

Netdata version

v1.33.1

What i do

I know that v1.33.1 is very old version for netdata. I 'am try to updata it but it's failed, because it's newst complited version of opkg pakage system
Also i am trid to reinstall and initialize the netdata.conf file all failled

OS / Environment

Linux OpenWrt 6.6.93 #0 SMP Mon Jun 23 20:40:36 2025 x86_64 GNU/Linux
OpenWrt 24.10.2 (r28739-d9340319c6)](Which is latest openwrt version)