runWalkForward
Runs a FIXED 3-window out-of-sample consistency check (a validation walk-forward — NO re-optimization) of a strategy. Creates three linked backtests (shared split_group_id, split_role=wf_window, split_index 0/1/2) over equal consecutive slices of the range, atomically in a single transaction. The SAME strategy is backtested over each window (there is no expanding-train / re-optimization step); the resulting overfitScore measures out-of-sample consistency across the windows. The set counts as a single concurrent backtest for billing purposes.
runWalkForward(
input: CreateBacktestInput!
): [Backtest!]!