BRENT 0 volume

[Plex134]

I was wondering if anyone trades BRENT? I've come across a couple issues that I'm unclear on.

The first, and possibly less interesting, is that while the rollconfig.csv appears to have the Roll Cycle as monthly, the roll calendar in roll_calendars_csv appears to be yearly. So I was curious does one roll it monthly or yearly?

The second is a bit more involved. I used bc-utils to get historical data, and on Barchart, the daily volume for BRENT seems robust. However, once I start updating the data daily from IB, the volume goes to 0 on all contracts, and when pysystemtrade attempts to take a position the log shows

2025-05-28 14:25:53 DEBUG stack_handler {'type': 'run_stack_handler', 'strategy_name': 'carry_trend_dynamic', 'instrument_code': 'BRENT', 'contract_order_id': 1439, 'instrument_order_id': 1396} Cut down order from size [0] to [-1] because of liquidity

which I assume is because it can't execute a trade with no liquidity? In any event, a position is never taken. I guess I'm curious if anyone else has come across this, and could it be due to an issue with the symbol or IB?

Thanks as always,

[Plex134]

Ah nevermind, it seems one should trade BRENT-LAST not BRENT. No volume for the former on IB...