Backtest
Pair

Days
Rule
Session

Optimize

Fills: from the second after the signal, each leg at its first trade on the fill's side (a buy at the ask, a sell at the bid), plus slippage; both legs in that second. Statistics from the bars before each bar only.

Choose a pair, the days and a rule, then Run backtest. It runs on the B3 tick store (ClickHouse), every second of the days chosen.