From 396c3facb8287b9a34076cae8f3d7b300d366d99 Mon Sep 17 00:00:00 2001
From: historia <[not public]>
Date: Tue, 15 Sep 2026 14:18:14 -0400
Subject: fix: atomic saves, casino RNG/config isolation, tick lifecycle

---
 internal/casino/slots.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'internal/casino/slots.go')

diff --git a/internal/casino/slots.go b/internal/casino/slots.go
index aba8f91..c519293 100644
--- a/internal/casino/slots.go
+++ b/internal/casino/slots.go
@@ -234,10 +234,15 @@ func ScaleToRTP(profile SlotProfile, target float64) SlotProfile {
 		return profile
 	}
 	scale := target / actual
+	// SlotProfile is a value API, but its slice and paytable maps are shared
+	// references. Clone both so tuning one machine cannot retune another.
+	profile.Symbols = append([]SlotSymbol(nil), profile.Symbols...)
 	for i := range profile.Symbols {
+		payouts := make(map[int]float64, len(profile.Symbols[i].Payout))
 		for length, payout := range profile.Symbols[i].Payout {
-			profile.Symbols[i].Payout[length] = payout * scale
+			payouts[length] = payout * scale
 		}
+		profile.Symbols[i].Payout = payouts
 	}
 	profile.TargetRTP = target
 	return profile
-- 
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