make some small changes to merging

Assets/Scripts/Meta/PullResolver.cs

@@ -90,7 +90,7 @@ namespace KernelPanic.Meta
             owned.version = version;
             bool overflow = version >= GachaTuning.MaxVersion;
             int merges = CalculateDupeMerges(overflow, unit.Id, context.FocusUnitId);
-            context.SaveData.merges = Math.Max(0, context.SaveData.merges) + merges;
+            owned.merges = Math.Max(0, owned.merges) + merges;
             if (GachaTuning.DupeConsolationBandwidth > 0)
             {
                 context.SaveData.standardPullCurrency += GachaTuning.DupeConsolationBandwidth;

Assets/Scripts/Meta/SaveService.cs

@@ -62,6 +62,8 @@ namespace KernelPanic.Meta
         public int rootCredits = GachaService.TestRootCreditsBalance;
         public int standardPullCurrency;
         public int limitedPullCurrency;
+        // Legacy global balance kept only so older saves deserialize cleanly.
+        // New duplicate-pull merges live on OwnedUnitSaveEntry.merges.
         public int merges;
         public List<OwnedUnitSaveEntry> ownedUnits = new();
         public List<string> ownedUnitIds = new();
@@ -87,6 +89,7 @@ namespace KernelPanic.Meta
             merges = Math.Max(0, merges);
             MigrateLegacyOwnedUnitIds();
             NormalizeOwnedUnits();
+            MigrateLegacyGlobalMerges();
         }
 
         public OwnedUnitSaveEntry FindOwnedUnit(string id)
@@ -169,6 +172,31 @@ namespace KernelPanic.Meta
                 }
 
                 entry.version = Math.Max(1, Math.Min(GachaTuning.MaxVersion, entry.version));
+                entry.merges = Math.Max(0, entry.merges);
+            }
+        }
+
+        private void MigrateLegacyGlobalMerges()
+        {
+            if (merges <= 0 || ownedUnits.Count == 0)
+            {
+                return;
+            }
+
+            bool hasSpecificMerges = false;
+            for (int i = 0; i < ownedUnits.Count; i++)
+            {
+                if (ownedUnits[i] != null && ownedUnits[i].merges > 0)
+                {
+                    hasSpecificMerges = true;
+                    break;
+                }
+            }
+
+            if (!hasSpecificMerges)
+            {
+                ownedUnits[0].merges = Math.Max(0, ownedUnits[0].merges) + merges;
+                merges = 0;
             }
         }
 
@@ -192,6 +220,7 @@ namespace KernelPanic.Meta
     {
         public string id;
         public int version = 1;
+        public int merges;
     }
 
     [Serializable]

Assets/Scripts/Meta/VersionUpgrader.cs

@@ -48,16 +48,17 @@ namespace KernelPanic.Meta
 
             int targetVersion = currentVersion + 1;
             int cost = GachaTuning.GetVersionUpgradeCost(targetVersion);
-            if (state.merges < cost)
+            int merges = Math.Max(0, entry.merges);
+            if (merges < cost)
             {
                 return VersionUpgradeResult.Failed(unitId, VersionUpgradeFailureReason.InsufficientMerges, currentVersion, targetVersion, cost);
             }
 
-            state.merges -= cost;
+            entry.merges = merges - cost;
             entry.version = targetVersion;
             collection?.SetVersionSilently(unitId, targetVersion);
 
-            VersionUpgradeResult result = VersionUpgradeResult.Upgraded(unitId, currentVersion, targetVersion, cost, state.merges);
+            VersionUpgradeResult result = VersionUpgradeResult.Upgraded(unitId, currentVersion, targetVersion, cost, entry.merges);
             UnitUpgraded?.Invoke(result);
             return result;
         }