[ixpmanager] Implementing backend

[Ivan Popovski]

Hi,

I have request to fix periods when creating league table because mrtg backend uses wrong periods.
Talking about grapher:upload-stats-to-db command which inserts stats into traffic_daily.

So, created new backend based on mrtg, fixed periods and used upload-stats-to-db with new --backend.
The problem is that this new backend works only when it is first in GRAPHER_BACKENDS list (v4.9).
This is weird, because UploadStatsToDb.php has

Grapher::backend( $this->option( 'backend' ) );
$this->setGrapher( Grapher::getFacadeRoot() );

but afterwards customer resolves backend as usual - first from list.

Anyway, is there a way to somehow force specific backend at least for console command,
because web app should continue to use mrtg backend?

Thank you