fix: suppress duplicate combat log npc learns

Modules/QuestieLearner.lua

@@ -1406,6 +1406,8 @@ function QuestieLearner:LearnNPC(npcId, name, level, subName, npcFlags, factionS
         CrossLinkAfterNPC(npcId)
     end
     _Learner:BroadcastIfCommsAvailable("NPC", npcId, existing)
+
+    return isNew
 end
 
 ------------------------------------------------------------------------
@@ -3728,9 +3730,14 @@ function QuestieLearner:OnCombatLogEvent(timestamp, eventType, srcGUID, srcName,
         -- Questie:Debug(Questie.DEBUG_LEARNER, "[QuestieLearner] Kill cached for correlation:", npcId, dstName, "@", tostring(px), tostring(py), "zone", tostring(zoneId))
     end
 
-    -- Unconditionally map the spawn position for Ascension DB building
+    -- Unconditionally map the spawn position for Ascension DB building.
+    -- Only announce the first time we learn a unique NPC ID; repeated kills
+    -- still update evidence but should not spam "learned" debug output.
+    local npcWasKnown = Questie.dbLearner.global.npcs[npcId] ~= nil
     self:LearnNPC(npcId, name, nil, nil, nil, nil, px, py, zoneId)
-    Questie:Debug(Questie.DEBUG_LEARNER, "[QuestieLearner] Combat-log learned NPC:", eventType, npcId, name or "?")
+    if not npcWasKnown then
+        Questie:Debug(Questie.DEBUG_LEARNER, "[QuestieLearner] Combat-log learned NPC:", eventType, npcId, name or "?")
+    end
 
     -- Phase 2: store per-GUID spawn evidence for weighted merge
     self:_StoreGuidSpawnEvidence(npcId, dstGUID, zoneId, px, py)

Tests/QuestieLearner_performance_spec.lua

@@ -215,6 +215,47 @@ describe("QuestieLearner kill-path batching", function()
         assert.equals(2, table.getn(queuedTimers))
     end)
 
+    it("only announces combat-log learning once per unique NPC id", function()
+        local debugMessages = {}
+        local originalDebug = Questie.Debug
+        Questie.Debug = function(self, level, ...)
+            local parts = { ... }
+            for i = 1, table.getn(parts) do
+                if parts[i] == "[QuestieLearner] Combat-log learned NPC:" then
+                    debugMessages[table.getn(debugMessages) + 1] = level
+                    break
+                end
+            end
+        end
+
+        QuestieLearner:OnCombatLogEvent(
+            1234,
+            "PARTY_KILL",
+            UnitGUID("player"),
+            UnitName("player"),
+            nil,
+            "Creature-0-0-0-0-7010-0000000001",
+            "Unique Boar",
+            nil
+        )
+
+        QuestieLearner:OnCombatLogEvent(
+            1235,
+            "PARTY_KILL",
+            UnitGUID("player"),
+            UnitName("player"),
+            nil,
+            "Creature-0-0-0-0-7010-0000000002",
+            "Unique Boar",
+            nil
+        )
+
+        assert.is_table(Questie.dbLearner.global.npcs[7010])
+        assert.equals(1, table.getn(debugMessages))
+
+        Questie.Debug = originalDebug
+    end)
+
     it("still learns credited UNIT_DIED combat-log events when PARTY_KILL is absent", function()
         QuestieLearner:OnCombatLogEvent(
             1234,