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Frontiera Sharpe monotona al scendere del tf ma margine fee si assottiglia: MR02_BTC muore a fee2x a 5m (-1.70); MR02 sotto i 15m e' fee-death nel regime corrente (1m -64%). 1m: flat share ETH 25.6% + niente storia full -> chiuso. Corr col 15m live: 5m 0.46 / 10m 0.53. Fix resample unit-safe (pandas 2.x ms). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>