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Pinned backtest window: Pin range / Rerun latest on the bot card; a pinned bot replays exactly the same candles on every start (backtest_from/to, not part of the strategy fingerprint, stripped from export).
Data hash: sha256 of the raw candles per run; a rerun on the same slice with different data shows a console WARN and a "Data changed" chip.
Two-tier variant counter: "Backtest #3 · 12 total" — distinct configs on this slice vs. lifetime; bot_config_runs rebuilt into a run log (idempotent migration).
Verify against exchange: Verify data re-fetches the range and diffs it against the stored candles; keep the local snapshot or accept the exchange data (POST /api/bots/{id}/verify-data, POST /api/data/verify; candles.fetched_at).
Examples button in the algorithms header; Avg Trade tile explains it is the expectancy.
9 new tests (tests/test_reproducibility.py); golden order streams unchanged.