Allow signal exit bid-ask spread filter

If you check Allow signal override next to Exit bid-ask spread filter, then bidAskSpreadFilter in the webhook (when present) is used as the exit spread cap for that signal. If the key is omitted, the Exit bid-ask spread filter saved on the subscription is used.

If Allow signal overrides is enabled, bidAskSpreadFilter is also honored for exit planning even when Allow signal override for Exit bid-ask spread filter is unchecked.

Example:

{
    "ticker": "AAPL",
    "action": "exit",
    "bidAskSpreadFilter": 0.02
}