Function trailing_stop 

pub fn trailing_stop(trail_pct: f64) -> TrailingStop

Create a trailing stop condition.

The trailing stop tracks the best price (highest for longs, lowest for shorts) since position entry and triggers when price retraces by the specified percentage.

Example

use finance_query::backtesting::condition::*;

// Exit if price drops 3% from the highest point since entry
let exit = trailing_stop(0.03);