for active proxies, we can set config & data refresh per proxy in the proxy config file.

for passive proxies, we can only set this in the server config file for all proxies at once. this does not scale well for multiple passive proxies that should have different parameters.

there should be a way to configure both config & data sending/polling frequencies per passive proxy.

this will require extending db schema and frontend so that these parameters can be configured in administration -> dm