I think -1 should be fixed in general.
Use -1 internal but name it max. I know for sure, that what you see at the surface hasn’t to be what you store in the database.
Make sure that we cannot select 2, 3, …, max, if only 1 is working.
If ASAP only opens 1 simultaneous deal per pair, maybe add a timeframe to allow more than 1 simultaneous deal so that we don’t have to use the RSI-7 1min > 1 hack.