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Detect had no floor on the interval. Four events minutes apart give gaps near 0.002 days, every one of them inside the ±50% band, so it proposed a routine and PhraseRoutine called it "каждый день". UNIQUE(action, object) makes that unrecoverable: dismissing the bogus proposal burns the pair, and the real routine behind it can never be proposed again. It also made hand-QA unsafe — seeding a pattern with four chat turns poisoned the pair being tested. The floor is two hours against the median, not a day, because meals, water and breaks are genuine several-times-a-day habits.