Partial sizing configuration object
Unique sizing identifier (must exist)
Optional: Sizing method
Optional: Risk percentage per trade
Optional: Kelly multiplier
Optional: ATR multiplier
Optional: Max position size as % of account
Optional: Minimum position size
Optional: Maximum position size
Optional: Lifecycle callbacks
Overrides an existing position sizing configuration in the framework.
This function partially updates a previously registered sizing configuration with new settings. Only the provided fields will be updated, other fields remain unchanged.